Derivatives and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Fair values, Volume of activity and gain/loss information related to derivative instruments
Notional Amount	$ 84,457	$ 74,544	$ 68,119
Derivative Assets, Gross	818	945	900
Derivative Asset, Netting adjustments	(1,382)	(1,452)	(1,219)
Total Derivative Asset	818	945	900
Derivative Liability, Netting adjustments	(880)	(978)	(847)
Total Derivative Liability	763	1,026	991
Designated [Member]
Fair values, Volume of activity and gain/loss information related to derivative instruments
Notional Amount	16,334	15,621	10,901
Derivative Assets, Gross	588	589	459
Derivative Liabilities, Gross	40	174	151
Nondesignated [Member]
Fair values, Volume of activity and gain/loss information related to derivative instruments
Notional Amount	68,123	58,923	57,218
Derivative Assets, Gross	1,612	1,808	1,660
Derivative Liabilities, Gross	1,603	1,830	1,687
Interest rate [Member] | Designated [Member]
Fair values, Volume of activity and gain/loss information related to derivative instruments
Notional Amount	15,903	15,067	9,713
Derivative Assets, Gross	586	589	459
Derivative Liabilities, Gross	32	27	1
Interest rate [Member] | Nondesignated [Member]
Fair values, Volume of activity and gain/loss information related to derivative instruments
Notional Amount	58,222	48,537	46,355
Derivative Assets, Gross	1,273	1,364	1,149
Derivative Liabilities, Gross	1,278	1,371	1,180
Foreign exchange [Member] | Designated [Member]
Fair values, Volume of activity and gain/loss information related to derivative instruments
Notional Amount	431	554	1,188
Derivative Assets, Gross	2
Derivative Asset, Netting adjustments	8
Derivative Liabilities, Gross		147	150
Foreign exchange [Member] | Nondesignated [Member]
Fair values, Volume of activity and gain/loss information related to derivative instruments
Notional Amount	5,579	5,549	6,001
Derivative Assets, Gross	105	151	178
Derivative Liabilities, Gross	97	141	169
Energy and commodity [Member] | Nondesignated [Member]
Fair values, Volume of activity and gain/loss information related to derivative instruments
Notional Amount	1,691	1,610	1,896
Derivative Assets, Gross	209	253	295
Derivative Liabilities, Gross	204	253	303
Credit [Member] | Nondesignated [Member]
Fair values, Volume of activity and gain/loss information related to derivative instruments
Notional Amount	2,613	3,210	2,934
Derivative Assets, Gross	25	37	34
Derivative Liabilities, Gross	24	62	31
Equity [Member] | Nondesignated [Member]
Fair values, Volume of activity and gain/loss information related to derivative instruments
Notional Amount	18	17	32
Derivative Assets, Gross		3	4
Derivative Liabilities, Gross		$ 3	$ 4