Consolidated Statement of Changes in Shareholders' Equity (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010		Dec. 31, 2009
Consolidated Statement of Changes in Shareholders' Equity [Abstract]
OTTI losses in non-credit component on securities	$ 0	$ 0		$ 84	[1]
OTTI on securities available-for-sale and held to maturity	0	79	[1],[2]	124	[1],[2]
Total OTTI losses on securities available-for-sale	$ 0	$ 79		$ 208

[1] During 2011, there were no other-than-temporary ("OTTI") losses on securities recognized in other revenues and no OTTI losses on securities were recognized in the non-credit component in accumulated other comprehensive income (loss) ("AOCI"), net of tax. During 2010, other-than-temporary impairment OTTI losses on securities available-for-sale and held-to-maturity totaling $79 million were recognized in other revenues and losses in the non-credit component recognized in AOCI, net of tax were not significant. During 2009, $208 million of OTTI losses on securities available-for-sale were recognized, of which $84 million was recognized in AOCI, net of tax.

[2] During 2011, there were no other-than-temporary ("OTTI") losses on securities recognized in other revenues and no OTTI losses on securities were recognized in the non-credit component in accumulated other comprehensive income (loss) ("AOCI"), net of tax. During 2010, other-than-temporary impairment OTTI losses on securities available-for-sale and held-to-maturity totaling $79 million were recognized in other revenues. There were no significant losses in the non-credit component of such impaired securities reflected in AOCI, net of tax. During 2009, $208 million of OTTI losses on securities available-for-sale were recognized, of which $84 million was recognized in AOCI, net of tax.