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Derivatives - Cash Flow Hedges (Details) - Cash flow hedge - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivatives in Cash Flow Hedging Relationships        
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative $ 182 $ (74) $ 100 $ (175)
Pretax gain (loss) recognized in income on effective portion of derivative as a result of reclassification from accumulated other comprehensive income (28) 5 (62) 23
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges (11)   (11)  
After-tax net unrealized gain (loss) anticipated to be reclassified from AOCI to the income statement within next twelve months     (15)  
After-tax net unrealized gain (loss) anticipated to be reclassified from AOCI to the Income Statement over remaining fiscal year     (20)  
After-tax net unrealized gain (loss) anticipated to be reclassified from AOCI to the Income Statement in 2019     10  
After-tax unrealized gain (loss) anticipated to be reclassified from AOCI to the Income Statement after 2019     $ (1)  
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 179 (72) $ 100 (172)
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 (27) 5 (61) 23
Interest rate swap contracts        
Derivatives in Cash Flow Hedging Relationships        
Derivative notional amount 500   500  
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative 3 $ (2)   $ (3)
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges (9)   (9)  
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)   $ (1)