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Financial Instruments - Cash Flow Hedges After-tax Gains/(Losses) (Details) - Cash Flow Hedges - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings $ 0 $ 13 $ 9 $ 10
Net derivative gains/(losses) 25 (6) 14 21
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 (3) 0 (2)
Net derivative gains/(losses) 0 (11) 0 (37)
Commodity contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings 0 16 0 12
Net derivative gains/(losses) 0 25 0 31
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings 0 0 9 0
Net derivative gains/(losses) $ 25 $ (20) $ 14 $ 27