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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Hedging Activity, Affecting Accumulated Other Comprehensive Income [Roll Forward]
Gain at beginning of period	$ 153	$ 15	$ 92	$ 15
Losses (gains) transferred to earnings	(63)	4	(158)	(8)
Recognized gains (losses)	2	(29)	158	(17)
Gain/(loss) as of September 30,	92	(10)	92	(10)
Foreign Exchange Contract [Member]
Hedging Activity, Affecting Accumulated Other Comprehensive Income [Roll Forward]
Recognized gains (losses)	2	(29)	158	(17)
Derivative Instruments, gains to be reclassified to earnings.	82		82
Foreign Exchange Contract [Member] | Other Comprehensive Income (Loss) [Member]
Hedging Activity, Affecting Accumulated Other Comprehensive Income [Roll Forward]
Losses (gains) transferred to earnings	(63)	4	(158)	(8)
Recognized gains (losses)	2	(29)	158	(17)
Gain/(loss) as of September 30,	$ 92	$ (10)	$ 92	$ (10)