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Derivatives - Cash Flow Hedges (Details) - Cash flow hedge - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
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 $ (80) $ (44) $ (255) $ (180)      
Pretax gain (loss) recognized in income on effective portion of derivative as a result of reclassification from accumulated other comprehensive income (2) 24 21 104      
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges (85)   (85)        
After-tax net unrealized gain (loss) anticipated to be reclassified from AOCI to the income statement within next twelve months     (50)        
After-tax net unrealized gain (loss) anticipated to be reclassified from AOCI to the Income Statement over remaining fiscal year     (9)        
After-tax net unrealized gain (loss) anticipated to be reclassified from AOCI to the Income Statement in 2018     (44)        
After-tax unrealized gain (loss) anticipated to be reclassified from AOCI to the Income Statement after 2018     $ (32)        
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 (77) (47) $ (249) (178)      
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 (2) 24 21 105      
Interest rate swap contracts              
Derivatives in Cash Flow Hedging Relationships              
Derivative notional amount 200 300 200 300 $ 200 $ 200 $ 200
Pretax Gain (Loss) Recognized in Other Comprehensive Income on Effective portion of Derivative (3) $ 3 (6) (2)      
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges $ (8)   $ (8)        
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)