Consolidated Statement of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Consolidated Statement of Comprehensive Income [Abstract]
Net income	$ 235	$ 479
Net change in unrealized gains (losses), net of tax as applicable on:
Securities available-for-sale, not other-than-temporarily impaired	(127)	(147)
Other-than-temporary impaired debt securities available for sale		1	[1]
Other-than-temporarily impaired debt securities held to maturity		11	[1]
Adjustment to reverse other-than-temporary impairment on securities held-to-maturity due to deconsolidation of a variable interest entity		142
Derivatives classified as cash flow hedges	37	(4)
Unrecognized actuarial gains, transition obligation and prior service costs relating to pension and postretirement benefits, net of tax	1	1
Other comprehensive income, net of tax	(89)	4
Comprehensive income	$ 146	$ 483

[1] During the three months ended March 31, 2012 and 2011 there were no other-than-temporary impairment ("OTTI") losses on securities recognized in other revenues and no OTTI losses in the non-credit component on securities were recognized in accumulated other comprehensive income.