Consolidated Balance Sheet (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Other liabilities, allowance for lending related commitments	$ 121	$ 121
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, authorized (shares)	3,500,000,000	3,500,000,000
Common stock, issued (shares)	1,260,549,075	1,254,182,209
Treasury stock, common shares (shares)	99,902,366	90,691,868
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, authorized (shares)	100,000,000	100,000,000
Preferred stock, issued (shares)	10,826	10,826
Operations
Other liabilities, allowance for lending related commitments	121	121
Held-to-maturity, fair value	11,845	8,389
Other assets, fair value	1,460	1,321
Other liabilities, fair value	310	704
Long-term debt, at fair value	$ 341	$ 345