Derivative Financial Instruments (Schedule of the Fair Values of Derivative Financial Instruments) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Derivative Liability, Fair Value	$ 742
Interest-Rate Contracts [Member] | Derivatives not Designated as Hedging Instruments [Member]
Derivative Asset, Fair Value	397	412
Derivative Liability, Fair Value	471	423
Foreign Exchange Contracts [Member] | Derivatives not Designated as Hedging Instruments [Member]
Derivative Asset, Fair Value	8,278	7,779
Derivative Liability, Fair Value	8,312	8,174
Credit Derivative Contracts [Member] | Derivatives not Designated as Hedging Instruments [Member]
Derivative Asset, Fair Value		1
Derivative Liability, Fair Value	1	1
Derivatives not Designated as Hedging Instruments [Member]
Derivative Asset, Fair Value	8,676	8,193
Derivative Liability, Fair Value	8,784	8,598
Derivatives not Designated as Hedging Instruments [Member] | Equity Derivative Contracts [Member]
Derivative Asset, Fair Value	1	1
Interest-Rate Contracts [Member] | Designated as Hedging Instrument [Member]
Derivative Asset, Fair Value	66	32
Derivative Liability, Fair Value	230	228
Designated as Hedging Instrument [Member]
Derivative Asset, Fair Value	66	32
Derivative Liability, Fair Value	$ 230	$ 228