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element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.","units":{"USD":[{"end":"2011-12-31","val":3632000000,"accn":"0001445146-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-19","frame":"CY2011Q4I"},{"end":"2011-12-31","val":3632000000,"accn":"0001445146-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30"},{"end":"2011-12-31","val":3632000000,"accn":"0001445146-12-000015","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-31"},{"end":"2012-06-30","val":3971000000,"accn":"0001445146-12-000015","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-31","frame":"CY2012Q2I"},{"end":"2012-09-30","val":4283000000,"accn":"0001445146-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30","frame":"CY2012Q3I"}]}},"AvailableForSaleSecuritiesGrossUnrealizedGainLoss":{"label":"Available-for-sale Securities, Gross Unrealized Gain (Loss) (Deprecated 2013-01-31)","description":"The net amount of gross unrealized gains (losses) for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.","units":{"USD":[{"end":"2011-12-31","val":61000000,"accn":"0001445146-13-000003","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-19","frame":"CY2011Q4I"}]}},"AvailableforsaleSecuritiesGrossUnrealizedGain":{"label":"Available-for-sale Securities, Gross Unrealized Gains (Deprecated 2013-01-31)","description":"This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.","units":{"USD":[{"end":"2011-12-31","val":61000000,"accn":"0001445146-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30","frame":"CY2011Q4I"},{"end":"2011-12-31","val":61000000,"accn":"0001445146-12-000015","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-31"},{"end":"2012-06-30","val":186000000,"accn":"0001445146-12-000015","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-31","frame":"CY2012Q2I"},{"end":"2012-09-30","val":480000000,"accn":"0001445146-12-000021","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30","frame":"CY2012Q3I"}]}},"CashAndCashEquivalentsAtCarryingValue":{"label":"Cash and Cash Equivalents, at Carrying Value","description":"Amount of currency on hand as well as demand deposits with banks or financial institutions. 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The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent 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