Derivative and Other Financial Instruments (Accumulated Other Comprehensive Income ("AOCI") and Earnings from Changes in Fair Value Related to Derivative Instruments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) recognized in AOCI (effective portion)	$ 4	$ (14)	$ 19	$ (28)
Amount of gain/(loss) reclassified from AOCI into earnings	1	(9)	(5)	(13)
Foreign Exchange [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) recognized in AOCI (effective portion)	0	1	3	(2)
Amount of gain/(loss) reclassified from AOCI into earnings	1	0	2	(1)
Commodities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain/(loss) recognized in AOCI (effective portion)	4	(15)	16	(26)
Amount of gain/(loss) reclassified from AOCI into earnings	$ 0	$ (9)	$ (7)	$ (12)