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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":{"CAD":[{"end":"2010-12-31","val":376000000,"accn":"0001104659-14-010428","fy":2013,"fp":"FY","form":"40-F","filed":"2014-02-14","frame":"CY2010Q4I"},{"end":"2011-12-31","val":723000000,"accn":"0001104659-14-010428","fy":2013,"fp":"FY","form":"40-F","filed":"2014-02-14","frame":"CY2011Q4I"},{"end":"2012-12-31","val":1776000000,"accn":"0001104659-14-010428","fy":2013,"fp":"FY","form":"40-F","filed":"2014-02-14"},{"end":"2012-12-31","val":1776000000,"accn":"0001104659-14-063983","fy":2014,"fp":"Q2","form":"6-K","filed":"2014-08-29"},{"end":"2012-12-31","val":1776000000,"accn":"0001104659-15-012174","fy":2014,"fp":"FY","form":"40-F","filed":"2015-02-19","frame":"CY2012Q4I"},{"end":"2013-03-31","val":1346000000,"accn":"0001104659-14-063983","fy":2014,"fp":"Q2","form":"6-K","filed":"2014-08-29","frame":"CY2013Q1I"},{"end":"2013-06-30","val":1077000000,"accn":"0001104659-14-063983","fy":2014,"fp":"Q2","form":"6-K","filed":"2014-08-29","frame":"CY2013Q2I"},{"end":"2013-12-31","val":776000000,"accn":"0001104659-14-010428","fy":2013,"fp":"FY","form":"40-F","filed":"2014-02-14"},{"end":"2013-12-31","val":756000000,"accn":"0001104659-14-063983","fy":2014,"fp":"Q2","form":"6-K","filed":"2014-08-29"},{"end":"2013-12-31","val":776000000,"accn":"0001104659-15-012174","fy":2014,"fp":"FY","form":"40-F","filed":"2015-02-19"},{"end":"2013-12-31","val":776000000,"accn":"0001104659-16-098507","fy":2015,"fp":"FY","form":"40-F","filed":"2016-02-19","frame":"CY2013Q4I"},{"end":"2014-03-31","val":849000000,"accn":"0001104659-14-063983","fy":2014,"fp":"Q2","form":"6-K","filed":"2014-08-29","frame":"CY2014Q1I"},{"end":"2014-06-30","val":1248000000,"accn":"0001104659-14-063983","fy":2014,"fp":"Q2","form":"6-K","filed":"2014-08-29"},{"end":"2014-06-30","val":1248000000,"accn":"0001104659-15-062298","fy":2015,"fp":"Q2","form":"6-K","filed":"2015-08-28","frame":"CY2014Q2I"},{"end":"2014-12-31","val":1261000000,"accn":"0001104659-15-012174","fy":2014,"fp":"FY","form":"40-F","filed":"2015-02-19"},{"end":"2014-12-31","val":1261000000,"accn":"0001104659-15-062298","fy":2015,"fp":"Q2","form":"6-K","filed":"2015-08-28"},{"end":"2014-12-31","val":1261000000,"accn":"0001104659-16-098507","fy":2015,"fp":"FY","form":"40-F","filed":"2016-02-19"},{"end":"2014-12-31","val":1261000000,"accn":"0001104659-16-120456","fy":2015,"fp":"FY","form":"6-K","filed":"2016-05-12"},{"end":"2014-12-31","val":1261000000,"accn":"0001104659-17-010184","fy":2016,"fp":"FY","form":"40-F","filed":"2017-02-17","frame":"CY2014Q4I"},{"end":"2015-06-30","val":1209000000,"accn":"0001104659-15-062298","fy":2015,"fp":"Q2","form":"6-K","filed":"2015-08-28","frame":"CY2015Q2I"},{"end":"2015-12-31","val":1015000000,"accn":"0001104659-16-098507","fy":2015,"fp":"FY","form":"40-F","filed":"2016-02-19"},{"end":"2015-12-31","val":1015000000,"accn":"0001104659-16-120456","fy":2015,"fp":"FY","form":"6-K","filed":"2016-05-12"},{"end":"2015-12-31","val":1015000000,"accn":"0001104659-17-010184","fy":2016,"fp":"FY","form":"40-F","filed":"2017-02-17"},{"end":"2015-12-31","val":654000000,"accn":"0000895728-18-000008","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2015Q4I"},{"end":"2016-12-31","val":2117000000,"accn":"0001104659-17-010184","fy":2016,"fp":"FY","form":"40-F","filed":"2017-02-17"},{"end":"2016-12-31","val":1494000000,"accn":"0000895728-18-000008","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","frame":"CY2016Q4I"},{"end":"2017-12-31","val":480000000,"accn":"0000895728-18-000008","fy":2017,"fp":"FY","form":"10-K","filed":"2018-02-16","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. Includes effect from exchange rate 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Excludes amount for disposal group and discontinued operations. 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. 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