CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 167	$ (137)	$ 613	$ (550)
Net change in unrealized gains (losses), net of tax, on:
Derivatives designated as cash flow hedges	32	34	238	84
Securities available-for-sale, not other-than temporarily impaired	0	15	(115)	21
Other-than-temporarily impaired debt securities available-for-sale	0	0	(1)	1
Pension and postretirement benefit plan adjustments, net of tax	0	0	1	1
Foreign currency translation adjustments, net of tax	0	4	(11)	4
Other comprehensive income, net of tax	32	53	112	111
Total comprehensive income (loss)	$ 199	$ (84)	$ 725	$ (439)