Consolidated Balance Sheet (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Other liabilities, allowance for lending related commitments	$ 108	$ 103
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	3,500,000,000	3,500,000,000
Common stock, issued	1,250,564,475	1,249,061,305
Treasury stock, common shares	57,848,021	39,386,698
Operations
Held-to-maturity, fair value	4,849	3,540
Other assets, fair value	1,200	1,848
Other liabilities, allowance for lending related commitments	108	103
Other liabilities, fair value	275	382
Long-term debt, fair value	$ 320	$ 326