Derivative Financial Instruments (Schedule Of The Fair Values Of Derivative Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	$ 911
Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	13,893	8,193
Derivative Liability, Fair Value	14,013	8,596
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	12,210	8,058
Derivative Liability, Fair Value	12,315	8,455
Derivatives Not Designated As Hedging Instruments [Member] | Interest-Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	1,682	133
Derivative Liability, Fair Value	1,688	131
Derivatives Not Designated As Hedging Instruments [Member] | Other Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	1
Derivative Liability, Fair Value	10
Derivatives Not Designated As Hedging Instruments [Member] | Credit Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value		2
Derivative Liability, Fair Value		10
Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	126	32
Derivative Liability, Fair Value	330	228
Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	3
Derivative Liability, Fair Value	37
Designated As Hedging Instruments [Member] | Interest-Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	123	32
Derivative Liability, Fair Value	$ 293	$ 228