CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 536	$ (845)	$ (1,408)
Net change in unrealized gains (losses), net of tax, on:
Derivatives designated as cash flow hedges	261	136	81
Securities available-for-sale, not other-than temporarily impaired	(115)	12	24
Other-than-temporarily impaired debt securities available-for-sale	(1)	2	4
Pension and postretirement benefit plan adjustments, net of tax	15	(15)	(11)
Foreign currency translation adjustments, net of tax	(11)	4	(3)
Other comprehensive income, net of tax	149	139	95
Total comprehensive income (loss)	$ 685	$ (706)	$ (1,313)