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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain/(loss) recognized in AOCI (effective portion) $ (3) $ 17 $ 18 $ 15
Amount of gain/(loss) reclassified from AOCI into earnings 9 (3) 10 (6)
Foreign Exchange [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain/(loss) recognized in AOCI (effective portion) 5 3 3 3
Amount of gain/(loss) reclassified from AOCI into earnings 2 (1) 0 1
Commodities [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain/(loss) recognized in AOCI (effective portion) (8) 14 15 12
Amount of gain/(loss) reclassified from AOCI into earnings $ 7 $ (2) $ 10 $ (7)