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Derivatives - Cash Flow Hedges (Details) - Cash flow hedge - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Jun. 30, 2016
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 $ (101) $ (121)    
Pretax gain (loss) recognized in income on effective portion of derivative as a result of reclassification from accumulated other comprehensive income 18 52    
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges 15      
After-tax net unrealized gain (loss) anticipated to be reclassifed from AOCI to the income statement within next twelve months 9      
After-tax net unrealized gain (loss) anticipated to be reclassifed from AOCI to the Income Statement over remaining fiscal year 13      
After-tax net unrealized gain (loss) anticipated to be reclassifed from AOCI to the Income Statement in 2018 2      
Foreign currency forward/option contracts        
Derivatives in Cash Flow Hedging Relationships        
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative (100) (120)    
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 18 53    
Interest rate swap contracts        
Derivatives in Cash Flow Hedging Relationships        
Derivative notional amount 200   $ 200 $ 300
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative (1) (1)    
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges $ (5)      
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)