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Derivatives - Cash Flow Hedges (Details) - Cash flow hedge - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivatives in Cash Flow Hedging Relationships          
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative   $ 22 $ (80) $ 122 $ (255)
Pretax gain (loss) recognized in income on effective portion of derivative as a result of reclassification from accumulated other comprehensive income   (37) (2) (99) 21
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges $ 35 35   35  
After-tax net unrealized gain (loss) anticipated to be reclassified from AOCI to the income statement within next twelve months       22  
After-tax net unrealized gain (loss) anticipated to be reclassified from AOCI to the Income Statement over remaining fiscal year       1  
After-tax net unrealized gain (loss) anticipated to be reclassifed from AOCI to the Income Statement over next fiscal year       25  
After-tax unrealized gain (loss) anticipated to be reclassified from AOCI to the Income Statement after 2019       $ 9  
Foreign currency forward/option contracts          
Derivatives in Cash Flow Hedging Relationships          
Maximum length of time hedged in cash flow hedge       36 months  
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative   12 (77) $ 112 (249)
Foreign currency forward/option contracts | Cost of sales          
Derivatives in Cash Flow Hedging Relationships          
Pretax gain (loss) recognized in income on effective portion of derivative as a result of reclassification from accumulated other comprehensive income   (37) (2) (98) 21
Interest rate swap contracts          
Derivatives in Cash Flow Hedging Relationships          
Derivative notional amount 700 700   700  
Termination Of Derivative 500        
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative   10 $ (3) 10 $ (6)
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges $ (7) $ (7)   (7)  
Interest rate swap contracts | Interest expense.          
Derivatives in Cash Flow Hedging Relationships          
Pretax gain (loss) recognized in income on effective portion of derivative as a result of reclassification from accumulated other comprehensive income       $ (1)