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Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents.","units":{"USD":[{"end":"2013-12-29","val":640697000,"accn":"0000726513-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-01","frame":"CY2013Q4I"},{"end":"2014-12-28","val":1455183000,"accn":"0000726513-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-01"},{"end":"2014-12-28","val":1455183000,"accn":"0000726513-18-000007","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-01","frame":"CY2014Q4I"},{"end":"2015-12-31","val":262644000,"accn":"0000726513-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-01"},{"end":"2015-12-31","val":262644000,"accn":"0000726513-17-000013","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-10"},{"end":"2015-12-31","val":262644000,"accn":"0000726513-17-000019","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09"},{"end":"2015-12-31","val":262644000,"accn":"0000726513-17-000026","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-08"},{"end":"2015-12-31","val":262644000,"accn":"0000726513-18-000007","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-01","frame":"CY2015Q4I"},{"end":"2016-12-31","val":590409000,"accn":"0000726513-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-01"},{"end":"2016-12-31","val":590409000,"accn":"0000726513-17-000013","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-10"},{"end":"2016-12-31","val":590409000,"accn":"0000726513-17-000019","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-08-09"},{"end":"2016-12-31","val":590409000,"accn":"0000726513-17-000026","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-11-08"},{"end":"2016-12-31","val":590409000,"accn":"0000726513-18-000007","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-01","frame":"CY2016Q4I"},{"end":"2017-12-31","val":673685000,"accn":"0000726513-18-000007","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-01","frame":"CY2017Q4I"}]}},"CashAndCashEquivalentsPeriodIncreaseDecrease":{"label":"Cash and Cash Equivalents, Period Increase (Decrease)","description":"Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. 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Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"end":"2015-12-31","val":283728000,"accn":"0000726513-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-01","frame":"CY2015Q4I"},{"end":"2016-12-31","val":611198000,"accn":"0000726513-18-000013","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2016-12-31","val":611198000,"accn":"0000726513-18-000019","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09"},{"end":"2016-12-31","val":611198000,"accn":"0000726513-18-000024","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09"},{"end":"2016-12-31","val":611198000,"accn":"0000726513-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-01","frame":"CY2016Q4I"},{"end":"2017-03-31","val":363787000,"accn":"0000726513-18-000013","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1I"},{"end":"2017-06-30","val":398133000,"accn":"0000726513-18-000019","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09","frame":"CY2017Q2I"},{"end":"2017-09-30","val":620305000,"accn":"0000726513-18-000024","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09","frame":"CY2017Q3I"},{"end":"2017-12-31","val":691251000,"accn":"0000726513-18-000013","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2017-12-31","val":691251000,"accn":"0000726513-18-000019","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09"},{"end":"2017-12-31","val":691251000,"accn":"0000726513-18-000024","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09"},{"end":"2017-12-31","val":691251000,"accn":"0000726513-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-01"},{"end":"2017-12-31","val":691251000,"accn":"0000726513-19-000011","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10"},{"end":"2017-12-31","val":691251000,"accn":"0000726513-19-000020","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-09","frame":"CY2017Q4I"},{"end":"2018-03-31","val":812045000,"accn":"0000726513-18-000013","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"end":"2018-03-31","val":812045000,"accn":"0000726513-19-000011","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10","frame":"CY2018Q1I"},{"end":"2018-06-30","val":845457000,"accn":"0000726513-18-000019","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09"},{"end":"2018-06-30","val":845457000,"accn":"0000726513-19-000020","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-09","frame":"CY2018Q2I"},{"end":"2018-09-30","val":904358000,"accn":"0000726513-18-000024","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09","frame":"CY2018Q3I"},{"end":"2018-12-31","val":1079648000,"accn":"0000726513-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-01"},{"end":"2018-12-31","val":1079648000,"accn":"0000726513-19-000011","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10"},{"end":"2018-12-31","val":1079648000,"accn":"0000726513-19-000020","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-09","frame":"CY2018Q4I"},{"end":"2019-03-31","val":1310856000,"accn":"0000726513-19-000011","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10","frame":"CY2019Q1I"},{"end":"2019-06-30","val":1330715000,"accn":"0000726513-19-000020","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-09","frame":"CY2019Q2I"}]}},"CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect":{"label":"Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect","description":"Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.","units":{"USD":[{"start":"2016-01-01","end":"2016-12-31","val":327470000,"accn":"0000726513-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-01","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":-247411000,"accn":"0000726513-18-000013","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10","frame":"CY2017Q1"},{"start":"2017-01-01","end":"2017-06-30","val":-213065000,"accn":"0000726513-18-000019","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09"},{"start":"2017-01-01","end":"2017-09-30","val":9107000,"accn":"0000726513-18-000024","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09"},{"start":"2017-01-01","end":"2017-12-31","val":80053000,"accn":"0000726513-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-01","frame":"CY2017"},{"start":"2018-01-01","end":"2018-03-31","val":120794000,"accn":"0000726513-18-000013","fy":2018,"fp":"Q1","form":"10-Q","filed":"2018-05-10"},{"start":"2018-01-01","end":"2018-03-31","val":120794000,"accn":"0000726513-19-000011","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10","frame":"CY2018Q1"},{"start":"2018-01-01","end":"2018-06-30","val":154206000,"accn":"0000726513-18-000019","fy":2018,"fp":"Q2","form":"10-Q","filed":"2018-08-09"},{"start":"2018-01-01","end":"2018-06-30","val":154206000,"accn":"0000726513-19-000020","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-09"},{"start":"2018-01-01","end":"2018-09-30","val":213107000,"accn":"0000726513-18-000024","fy":2018,"fp":"Q3","form":"10-Q","filed":"2018-11-09"},{"start":"2018-01-01","end":"2018-12-31","val":388397000,"accn":"0000726513-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-01","frame":"CY2018"},{"start":"2019-01-01","end":"2019-03-31","val":231208000,"accn":"0000726513-19-000011","fy":2019,"fp":"Q1","form":"10-Q","filed":"2019-05-10","frame":"CY2019Q1"},{"start":"2019-01-01","end":"2019-06-30","val":251067000,"accn":"0000726513-19-000020","fy":2019,"fp":"Q2","form":"10-Q","filed":"2019-08-09"}]}},"CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries":{"label":"SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Consolidated Subsidiaries","description":"This element represents disclosure of the aggregate cash dividends paid to the entity by consolidated subsidiaries.","units":{"USD":[{"end":"2014-08-04","val":275000000,"accn":"0000726513-15-000022","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-08"},{"end":"2014-08-04","val":275000000,"accn":"0000726513-15-000029","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-13"},{"end":"2014-08-04","val":275000000,"accn":"0000726513-15-000034","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-10"},{"end":"2014-08-04","val":275000000,"accn":"0000726513-16-000039","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-29"},{"end":"2014-08-04","val":275000000,"accn":"0000726513-16-000046","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-10"},{"end":"2014-08-04","val":275000000,"accn":"0000726513-16-000053","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-09"},{"end":"2014-08-04","val":275000000,"accn":"0000726513-16-000060","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-09"},{"end":"2014-08-04","val":275000000,"accn":"0000726513-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-01","frame":"CY2014Q2I"}]}},"ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight":{"label":"Class of Warrant or Right, Number of Securities Called by Each Warrant or Right","description":"Number of securities into which each warrant or right may be converted. 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Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2015-12-31","val":27841000,"accn":"0000726513-16-000039","fy":2015,"fp":"FY","form":"10-K","filed":"2016-02-29","frame":"CY2015Q4I"},{"end":"2016-12-31","val":27841000,"accn":"0000726513-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-01","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0,"accn":"0000726513-18-000007","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-01","frame":"CY2017Q4I"},{"end":"2018-12-31","val":0,"accn":"0000726513-19-000006","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-01","frame":"CY2018Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive":{"label":"Long-Term Debt, Maturity, Year Five","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. 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