Derivative Financial Instruments (Schedule Of The Fair Values Of Derivative Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	$ 641
Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	6,743	13,893
Derivative Liability, Fair Value	6,454	14,013
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	6,738	12,210
Derivative Liability, Fair Value	6,444	12,315
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	5	1,682
Derivative Liability, Fair Value	1	1,688
Derivatives Not Designated As Hedging Instruments [Member] | Equity Derivative Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	0	1
Derivative Liability, Fair Value	9	10
Derivatives Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	188	126
Derivative Liability, Fair Value	307	330
Derivatives Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	7	3
Derivative Liability, Fair Value	7	37
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	181	123
Derivative Liability, Fair Value	$ 300	$ 293