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Accumulated Other Comprehensive Income (Details Of The Reclassification From AOCI) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net gains (losses) on financial instruments at fair value and foreign exchange	$ (6)	$ (6)	$ 57	$ (25)
Income (loss) before income taxes	(264)	795	(49)	816
Provision (benefit) for income taxes	(86)	214	(35)	225
Net income (loss)	(178)	581	(14)	591
Unrealized gains (losses) on AFS, net [Member] | Amounts Reclassified from AOCI [Member]
Net gains (losses) on financial instruments at fair value and foreign exchange			26
Net investment income			(3)
Income (loss) before income taxes			23
Provision (benefit) for income taxes			8
Net income (loss)			$ 15

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Change in the fair value of and realized gains and losses on financial instruments and foreign exchange included in earnings.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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