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Derivatives - Cash Flow Hedges (Details) - Cash flow hedge - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Derivatives in Cash Flow Hedging Relationships          
Pretax gain (loss) recognized in other comprehensive income on effective portion of derivative   $ 133 $ (311) $ 57  
Pretax gain (loss) recognized in income on effective portion of derivative as a result of reclassification from accumulated other comprehensive income   (96) 7 109  
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges   64      
After-tax net unrealized gain (loss) anticipated to be reclassified from AOCI to the income statement within next twelve months   55      
After-tax net unrealized gain (loss) anticipated to be reclassified from AOCI to the Income Statement in 2019   15      
After-tax unrealized gain (loss) anticipated to be reclassified from AOCI to the Income Statement after 2019   $ (6)      
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   $ 151 (305) 58  
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   (95) 8 110  
Interest rate swap contracts          
Derivatives in Cash Flow Hedging Relationships          
Derivative notional amount   1,200 600 200 $ 300
Termination Of Derivative $ 500        
Pretax gain (loss) recognized in other comprehensive income on effective portion of derivative   (18) (6) (1)  
Accumulated other comprehensive income (loss), unrealized gain (loss) on cash flow hedges   (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) $ (1) $ (1)