Derivatives and Hedging Activities (Details 5) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2011
Fair value of derivative assets
Derivative assets before collateral	$ 1,331	$ 1,431	$ 1,254
Less: Related collateral	513	486	354
Total derivative assets	818	945	900
Interest rate [Member]
Fair value of derivative assets
Derivative assets before collateral	1,221	1,257	1,026
Foreign exchange [Member]
Fair value of derivative assets
Derivative assets before collateral	22	64	110
Energy and commodity [Member]
Fair value of derivative assets
Derivative assets before collateral	82	96	105
Credit [Member]
Fair value of derivative assets
Derivative assets before collateral	6	12	10
Equity [Member]
Fair value of derivative assets
Derivative assets before collateral		$ 2	$ 3