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Fair Value Measurements and Financial Instruments - Schedule of Fair Value Hedges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fair Value Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value $ 1,420 $ 1,530 $ 1,420 $ 1,530
Activity related to fair value hedges [Abstract]        
Gain (loss) on derivatives 5 (3) (18) (3)
Gain (loss) on hedged items (5) 3 18 3
Fair Value Hedges | Foreign Currency Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 420 930 420 930
Activity related to fair value hedges [Abstract]        
Gain (loss) on derivatives 6 (3) (7) (1)
Gain (loss) on hedged items (6) 3 7 1
Fair Value Hedges | Interest Rate Swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 1,000 600 1,000 600
Activity related to fair value hedges [Abstract]        
Gain (loss) on derivatives (1) 0 (11) (2)
Gain (loss) on hedged items 1 0 11 2
Cash Flow Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 839 721 839 721
Activity related to cash flow hedges [Abstract]        
Gain (loss) recognized in OCI 14 (7) 6 (20)
Gain (loss) reclassified into Cost of sales (2) (1) (8) 2
Cash Flow Hedges | Foreign Currency Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 833 719 833 719
Activity related to cash flow hedges [Abstract]        
Gain (loss) recognized in OCI 14 (7) 6 (20)
Gain (loss) reclassified into Cost of sales (2) (1) (8) 2
Cash Flow Hedges | Commodity Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 6 2 6 2
Activity related to cash flow hedges [Abstract]        
Gain (loss) recognized in OCI 0 0 0 0
Gain (loss) reclassified into Cost of sales 0 0 0 0
Net Investment Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 2,166 1,372 2,166 1,372
Activity related to net investment hedges [Abstract]        
Gain (loss) on instruments 121 (106) 84 (139)
Gain (loss) on hedged items (119) 105 (82) 140
Net Investment Hedges | Foreign Currency Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 594 800 594 800
Activity related to net investment hedges [Abstract]        
Gain (loss) on instruments 43 (28) 25 (46)
Gain (loss) on hedged items (41) 27 (23) 47
Net Investment Hedges | Foreign Currency Debt        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 1,572 572 1,572 572
Activity related to net investment hedges [Abstract]        
Gain (loss) on instruments 78 (78) 59 (93)
Gain (loss) on hedged items $ (78) $ 78 $ (59) $ 93