Derivative Financial Instruments (Schedule Of The Fair Values Of Derivative Financial Instruments) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Derivative Liability, Fair Value	$ 1,870
Interest-Rate Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Asset, Fair Value	1,351	133
Derivative Liability, Fair Value	1,418	140
Foreign Exchange Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivative Asset, Fair Value	20,429	8,058
Derivative Liability, Fair Value	21,176	8,455
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	21,782	8,193
Derivative Liability, Fair Value	22,595	8,596
Derivatives Not Designated As Hedging Instruments [Member] | Equity Derivative Contracts [Member]
Derivative Asset, Fair Value	2	1
Interest-Rate Contracts [Member] | Designated As Hedging Instruments [Member]
Derivative Asset, Fair Value	103	32
Derivative Liability, Fair Value	297	228
Foreign Exchange Contracts [Member] | Designated As Hedging Instruments [Member]
Derivative Asset, Fair Value	221
Designated As Hedging Instruments [Member]
Derivative Asset, Fair Value	324	32
Derivative Liability, Fair Value	$ 297	$ 228