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Financial Instruments - Economic Hedges (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]              
Gain/(loss) related to interest rate swaps $ 0 $ 1 $ (5) $ 14      
Not Designated as Hedging Instrument, Economic Hedge              
Derivative Instruments, Gain (Loss) [Line Items]              
Gain/(loss) related to interest rate swaps         $ 234 $ (241) $ (138)
Not Designated as Hedging Instrument, Economic Hedge | Commodity contracts | Cost of sales              
Derivative Instruments, Gain (Loss) [Line Items]              
Gain/(loss) related to interest rate swaps         40 (218) (101)
Not Designated as Hedging Instrument, Economic Hedge | Intercompany loans and forecasted interest payments | Currency exchange contracts | Interest and other expense, net              
Derivative Instruments, Gain (Loss) [Line Items]              
Gain/(loss) related to interest rate swaps         98 13 21
Not Designated as Hedging Instrument, Economic Hedge | Forecasted transactions | Currency exchange contracts | Interest and other expense, net              
Derivative Instruments, Gain (Loss) [Line Items]              
Gain/(loss) related to interest rate swaps         (4) (2) 11
Not Designated as Hedging Instrument, Economic Hedge | Forecasted transactions | Currency exchange contracts | Cost of sales              
Derivative Instruments, Gain (Loss) [Line Items]              
Gain/(loss) related to interest rate swaps         103 (37) (76)
Not Designated as Hedging Instrument, Economic Hedge | Forecasted transactions | Currency exchange contracts | Selling, general and administrative expenses              
Derivative Instruments, Gain (Loss) [Line Items]              
Gain/(loss) related to interest rate swaps         $ (3) $ 3 $ 7