CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]
Net income (loss)	$ 226	$ (155)
Net change in unrealized gains (losses), net of tax, on:
Derivatives designated as cash flow hedges	168	55
Securities available-for-sale, not other-than-temporarily impaired	(115)	(9)
Other-than-temporarily impaired debt securities available-for-sale	(1)	0
Foreign currency translation adjustments, net of tax	(20)	5
Other comprehensive income, net of tax	32	51
Total comprehensive income (loss)	$ 258	$ (104)