Fair Value Fair Value (Schedule of Fair Value Measurements, Liabilities, Using Significant Unobservable Inputs) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended					3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Accrued Expenses And Other Liabilities [Member]	Sep. 30, 2011 Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2011 Accrued Expenses And Other Liabilities [Member]	Sep. 30, 2012 Foreign Exchange Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Sep. 30, 2011 Foreign Exchange Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Sep. 30, 2012 Foreign Exchange Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Sep. 30, 2011 Foreign Exchange Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Sep. 30, 2011 Interest Rate Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Sep. 30, 2012 Interest Rate Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Sep. 30, 2011 Interest Rate Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Sep. 30, 2012 Other [Member] Accrued Expenses And Other Liabilities [Member]	Sep. 30, 2011 Other [Member] Accrued Expenses And Other Liabilities [Member]	Sep. 30, 2012 Other [Member] Accrued Expenses And Other Liabilities [Member]	Dec. 31, 2010 Other [Member] Accrued Expenses And Other Liabilities [Member]	Sep. 30, 2012 Derivative Financial Instruments, Liabilities [Member] Accrued Expenses And Other Liabilities [Member]	Sep. 30, 2011 Derivative Financial Instruments, Liabilities [Member] Accrued Expenses And Other Liabilities [Member]	Sep. 30, 2012 Derivative Financial Instruments, Liabilities [Member] Accrued Expenses And Other Liabilities [Member]	Sep. 30, 2011 Derivative Financial Instruments, Liabilities [Member] Accrued Expenses And Other Liabilities [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning balance, Liabilities	$ 166	$ 239	$ 201	$ 269	$ 20	$ 0	$ 11	$ 157	$ 203	$ 161	$ 260	$ 16	$ 11	$ 0	$ 9	$ 9	$ 9	$ 9	$ 166	$ 228	$ 181	$ 269
Transfers into Level 3, Liabilities	0	0	0	0
Transfers out of Level 3, Liabilities	0	0	0	0
Recorded in Revenue, Liabilities	(58)	42	(142)	(11)	0	0		(58)	42	(131)	(21)	0	(11)	10	0	0	0		(58)	42	(142)	(11)
Recorded in Other Comprehensive Income, Liabilities	0	0	0	0
Purchases, Liabilities	0	(1)	0	(5)		0						(1)		(5)						(1)		(5)
Issuances, Liabilities	76	185	162	287	0	11		76	170	162	247	15	0	29	0	0	0		76	185	162	276
Sales, Liabilities	0	(16)	0	(20)		0						(16)		(20)		0				(16)		(20)
Settlements, Liabilities	(75)	(117)	(112)	(188)	(20)	0		(75)	(117)	(92)	(188)	0	0	0	0	0	0		(75)	(117)	(92)	(188)
Fair Value, ending balance, Liabilities	109	332	109	332	0	11	11	100	298	100	298	14	0	14	9	9	9	9	109	321	109	321
Change in Unrealized Gains (Losses) Related to Financial Instruments, Liabilities, Held at Period End	$ (43)	$ 61	$ (70)	$ 42	$ 0			$ (43)	$ 51	$ (70)	$ 32	$ 10	$ 0	$ 10		$ 0	$ 0		$ (43)	$ 61	$ (70)	$ 42