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Financial Instruments - Cash Flow Hedges After-tax Gains/(Losses) (Details) - Cash Flow Hedges - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings $ (5) $ 4 $ 9 $ (3)
Gains/(losses), net of taxes recognized in earnings/(losses) 21 16 (11) 27
Currency exchange contracts | Forecasted transactions        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings 0 1 0 1
Gains/(losses), net of taxes recognized in earnings/(losses) 0 (14) 0 (26)
Commodity contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings 0 3 0 (4)
Gains/(losses), net of taxes recognized in earnings/(losses) 0 6 0 6
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings (5) 0 9 0
Gains/(losses), net of taxes recognized in earnings/(losses) $ 21 $ 24 $ (11) $ 47