Consolidated Balance Sheet (Unaudited) (Parenthetical) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Assets
Securities held to maturity, fair value	$ 2,400,000,000	$ 3,400,000,000
Securities held to maturity, collateralizing short-term		881,000,000
Loans held for sale, designated under fair value option	364,000,000	1,300,000,000
Liabilities
Interest bearing, designated under fair value option	9,600,000,000	7,400,000,000
Long-term debt, designated under fair value option	$ 4,200,000,000	$ 5,400,000,000
Shareholders' equity
Common stock, par value	$ 5	$ 5
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares outstanding	712	712
Common stock, shares issued	712	712