CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 180		$ (545)		$ 363		$ (310)
Net change in unrealized gains (losses), net of tax as applicable on:
Securities available-for-sale	(585)	[1]	248	[1]	(735)	[1]	121	[1]
Derivatives designated as cash flow hedges	51		(37)		74		0
Pension and postretirement benefit plan adjustments, net of tax	0		0		0		1
Other comprehensive income (loss), net of tax	(534)		211		(661)		122
Comprehensive income (loss)	$ (354)		$ (334)		$ (298)		$ (188)

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