Consolidated Statement of Changes in Shareholders' Equity (Unaudited) (Parenthetical) (USD $) In Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010		Sep. 30, 2011	Sep. 30, 2010
Consolidated Statement of Changes in Shareholders' Equity [Abstract]
OTTI losses in non-credit component on securities	$ 0	$ 0		$ 0	$ 0
OTTI on securities available-for-sale and held to maturity	$ 0	$ 4	[1]	$ 0	$ 45	[1]

[1] During the three and nine months ended September 30, 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 (loss). During the three and nine months ended September 30, 2010, OTTI losses on securities available-for-sale and held-to-maturity totaling $4 million and $45 million, respectively, were recognized in other revenues and losses in the non-credit component recognized in accumulated other comprehensive income (loss) were not significant.