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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Hedging Activity, Affecting Accumulated Other Comprehensive Income [Roll Forward]
Gain at beginning of period			$ 63
Derivative (gains)/losses transferred to earnings	3	(63)	(10)	(158)
Change in fair value	56	2	21	158
Gain as of September 30,	74	92	74	92
Foreign Exchange Contract [Member]
Hedging Activity, Affecting Accumulated Other Comprehensive Income [Roll Forward]
Derivative Instruments, gains to be reclassified to earnings.	50		50
Other Comprehensive Income (Loss) [Member] | Foreign Exchange Contract [Member]
Hedging Activity, Affecting Accumulated Other Comprehensive Income [Roll Forward]
Gain at beginning of period	15	153	63	92
Derivative (gains)/losses transferred to earnings	3	(63)	(10)	(158)
Change in fair value	56	2	21	158
Gain as of September 30,	$ 74	$ 92	$ 74	$ 92