Guarantee Arrangements and Pledged Assets (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Total carrying value and contractual amounts of our sell protection credit derivatives and major off-balance sheet guarantee arrangements
Carrying Value	$ (4,299)	$ (7,759)
Notional/Maximum Exposure to Loss	299,419	338,865
Credit derivatives [Member]
Total carrying value and contractual amounts of our sell protection credit derivatives and major off-balance sheet guarantee arrangements
Carrying Value	(4,299)	(7,759)
Notional/Maximum Exposure to Loss	290,401	330,395
Financial standby letters of credit, net of participations [Member]
Total carrying value and contractual amounts of our sell protection credit derivatives and major off-balance sheet guarantee arrangements
Notional/Maximum Exposure to Loss	5,016	4,705
Performance (non-financial) guarantees [Member]
Total carrying value and contractual amounts of our sell protection credit derivatives and major off-balance sheet guarantee arrangements
Notional/Maximum Exposure to Loss	2,860	3,088
Liquidity asset purchase agreements [Member]
Total carrying value and contractual amounts of our sell protection credit derivatives and major off-balance sheet guarantee arrangements
Notional/Maximum Exposure to Loss	$ 1,142	$ 677