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)	$ 4		$ (782)		$ 367		$ (1,092)
Net change in unrealized gains (losses), net of tax:
Securities available-for-sale	(50)	[1]	97	[1]	(785)	[1]	218	[1]
Other-than-temporarily impaired debt securities held-to-maturity	(2)		0		(2)		0
Derivatives designated as cash flow hedges	21		11		95		11
Pension and post-retirement benefit plan	1		0		1		1
Total other comprehensive income (loss)	(26)		108		(687)		230
Comprehensive (loss)	$ (22)		$ (674)		$ (320)		$ (862)

[1] During the three and nine months ended September 30, 2013 and 2012, there were no other-than-temporary impairment ("OTTI") losses on securities recognized in other revenues and no OTTI losses related to the non-credit component of securities were recognized in accumulated other comprehensive income.