Fair Value Fair Value (Schedule of Fair Value Measurements, Liabilities, Using Significant Unobservable Inputs) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2012 Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2011 Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2012 Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2011 Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2012 Foreign Exchange Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2011 Foreign Exchange Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2012 Foreign Exchange Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2011 Foreign Exchange Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2011 Interest Rate Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2012 Interest Rate Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2011 Interest Rate Contracts [Member] Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2012 Other [Member] Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2011 Other [Member] Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2012 Other [Member] Accrued Expenses And Other Liabilities [Member]	Dec. 31, 2010 Other [Member] Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2012 Derivative Financial Instruments, Liabilities [Member] Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2011 Derivative Financial Instruments, Liabilities [Member] Accrued Expenses And Other Liabilities [Member]	Jun. 30, 2012 Derivative Financial Instruments, Liabilities [Member] Accrued Expenses And Other Liabilities [Member]	Jun. 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	$ 155	$ 201	$ 20	$ 241	$ 20	$ 269	$ 126	$ 232	$ 161	$ 260		$ 11	$ 0	$ 9	$ 9	$ 9	$ 9	$ 135	$ 241	$ 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	(78)	(125)	0	(20)	0	(87)	(78)	(20)	(115)	(88)		(10)	1	0	0	0		(78)	(20)	(125)	(87)
Recorded in Other Comprehensive Income, Liabilities		0		0		0
Purchases, Liabilities	0	0		(2)		(3)		(2)		(3)			0						(2)		(3)
Issuances, Liabilities	150	195	0	14	0	13	150		195		14	0	13	0	0	0		150	14	195	13
Sales, Liabilities	0	0		79		144		79		144			0		0				79		144
Settlements, Liabilities	(61)	(105)	(20)	(84)	(20)	(108)	(41)	(84)	(84)	(108)		(1)	0	0	0	0		(41)	(84)	(85)	(108)
Fair Value, ending balance, Liabilities	166	166	0	228	0	228	157	205	157	205	14	0	14	9	9	9	9	166	228	166	228
Change in Unrealized Gains (Losses) Related to Financial Instruments, Liabilities, Held at Period End	$ (52)	$ (68)	$ 0	$ (3)	$ 0	$ (35)	$ (52)	$ (17)	$ (68)	$ (49)	$ 14	$ 0	$ 14		$ 0	$ 0		$ (52)	$ (3)	$ (68)	$ (35)