Derivative Financial Instruments (Schedule Of The Fair Values Of Derivative Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	$ 495
Derivatives not designated as hedging instruments [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	9,304	13,893
Derivatives not designated as hedging instruments [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	9,137	14,013
Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	9,243	12,210
Derivatives not designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	9,067	12,315
Derivatives not designated as hedging instruments [Member] | Interest rate contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	61	1,682
Derivatives not designated as hedging instruments [Member] | Interest rate contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	61	1,688
Derivatives not designated as hedging instruments [Member] | Equity Derivative Contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	0	1
Derivatives not designated as hedging instruments [Member] | Equity Derivative Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	9	10
Derivatives Designated As Hedging Instruments [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	297	126
Derivatives Designated As Hedging Instruments [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	301	330
Derivatives Designated As Hedging Instruments [Member] | Foreign exchange contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	135	3
Derivatives Designated As Hedging Instruments [Member] | Foreign exchange contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	17	37
Derivatives Designated As Hedging Instruments [Member] | Interest rate contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value	162	123
Derivatives Designated As Hedging Instruments [Member] | Interest rate contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	$ 284	$ 293