Derivative Financial Instruments (Schedule Of The Fair Values Of Derivative Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	$ 381
Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	7,401	13,893
Derivative Liability, Fair Value	7,166	14,013
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	7,395	12,210
Derivative Liability, Fair Value	7,152	12,315
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	6	1,682
Derivative Liability, Fair Value	5	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	180	126
Derivative Liability, Fair Value	345	330
Derivatives Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	2	3
Derivative Liability, Fair Value	46	37
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	178	123
Derivative Liability, Fair Value	$ 299	$ 293