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Derivatives - Cash Flow Hedges (Details) - Cash flow hedge - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Dec. 31, 2016
Derivatives in Cash Flow Hedging Relationships            
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative $ (74) $ (15) $ (175) $ (136)    
Pretax gain (loss) recognized in income on effective portion of derivative as a result of reclassification from accumulated other comprehensive income 5 28 23 80    
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges (36)   (36)      
After-tax net unrealized gain (loss) anticipated to be reclassifed from AOCI to the income statement within next twelve months     (16)      
After-tax net unrealized gain (loss) anticipated to be reclassifed 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 in 2018     (18)      
After-tax unrealized gain (loss) anticipated to be reclassifed from AOCI to the Income Statement after 2018     $ (17)      
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 (72) (11) $ (172) (131)    
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 5 28 23 81    
Interest rate swap contracts            
Derivatives in Cash Flow Hedging Relationships            
Derivative notional amount 200 300 200 300 $ 200 $ 200
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative (2) $ (4) (3) (5)    
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges $ (5)   $ (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)