Financial Instruments Hedging Activity Reported In Accumulated Other Comprehensive Earnings (Losses) Net Of Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Hedging Activity, Affecting Accumulated Other Comprehensive Income [Roll Forward]
Gain (loss) at beginning of period			$ 15
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(2)	7	(12)	14
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(34)	(17)	12	5
Gain (loss) at end of period	15	21	15	21
Foreign Exchange Contract [Member]
Hedging Activity, Affecting Accumulated Other Comprehensive Income [Roll Forward]
Derivative Instruments, gains to be reclassified to earnings.	12		12
Foreign Exchange Contract [Member] | Other Comprehensive Income (Loss) [Member]
Hedging Activity, Affecting Accumulated Other Comprehensive Income [Roll Forward]
Gain (loss) at beginning of period	51	31	15	2
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(2)	7	(12)	14
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	(34)	(17)	12	5
Gain (loss) at end of period	$ 15	$ 21	$ 15	$ 21