CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Net loss	$ (845)	$ (1,408)	$ (1,916)
Net change in unrealized gains (losses), net of tax, on:
Derivatives designated as cash flow hedges	136	81	57
Securities available-for-sale, not other-than-temporarily impaired	12	24	40
Other-than-temporarily impaired debt securities available-for-sale	2	4	3
Pension and postretirement benefit plan adjustments	(15)	(11)	(8)
Foreign currency translation adjustments, net of tax	4	(3)	0
Other comprehensive income, net of tax	139	95	92
Total comprehensive loss	$ (706)	$ (1,313)	$ (1,824)