Consolidated Balance Sheet (unaudited) (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	3,500,000,000	3,500,000,000
Common stock, issued (shares)	1,303,799,499	1,290,222,821
Treasury stock, common shares (shares)	182,287,827	171,995,262
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	100,000,000	100,000,000
Preferred stock, issued (shares)	15,826	15,826
Operations
Held-to-maturity, fair value	$ 41,676	$ 21,127
Loans, fair value	140	21
Other assets	2,223	1,916
Other liabilities, allowance for lending related commitments	93	89
Other liabilities, fair value,	612	451
Long-term debt, fair value	355	347
Level 2
Loans, fair value	$ 140	$ 21