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Fair Value Measurements and Financial Instruments (Details 3) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Foreign Currency Contracts | Derivatives Not Designated as Hedging Instruments        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value $ 42 $ 6 $ 42 $ 6
Activity related to derivatives not designated as hedging instruments [Abstract]        
Gain (loss) on instruments 0 0 0 5
Gain (loss) on hedged items 0 0 0 (5)
Fair Value Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 1,695 1,489 1,695 1,489
Activity related to fair value hedges [Abstract]        
Gain (loss) on derivatives (15) (5) (18) (1)
Gain (loss) on hedged items 15 5 18 1
Fair Value Hedges | Foreign Currency Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 1,095 239 1,095 239
Activity related to fair value hedges [Abstract]        
Gain (loss) on derivatives (14) 1 (15) (4)
Gain (loss) on hedged items 14 (1) 15 4
Fair Value Hedges | Interest Rate Swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 600 1,250 600 1,250
Activity related to fair value hedges [Abstract]        
Gain (loss) on derivatives (1) (6) (3) 3
Gain (loss) on hedged items 1 6 3 (3)
Cash Flow Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 725 698 725 698
Activity related to cash flow hedges [Abstract]        
Gain (loss) recognized in OCI (8) 1 (28) (6)
Gain (loss) reclassified into Cost of sales (4) (1) (2) (1)
Cash Flow Hedges | Foreign Currency Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 724 690 724 690
Activity related to cash flow hedges [Abstract]        
Gain (loss) recognized in OCI (8) 3 (28) (6)
Gain (loss) reclassified into Cost of sales (4) (1) (2) (1)
Cash Flow Hedges | Commodity Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 1 8 1 8
Activity related to cash flow hedges [Abstract]        
Gain (loss) recognized in OCI 0 (2) 0 0
Gain (loss) reclassified into Cost of sales 0 0 0 0
Net Investment Hedges        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 1,339 2,107 1,339 2,107
Activity related to net investment hedges [Abstract]        
Gain (loss) on instruments (45) (17) (184) (56)
Gain (loss) on hedged items 44 17 184 56
Net Investment Hedges | Foreign Currency Contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 749 917 749 917
Activity related to net investment hedges [Abstract]        
Gain (loss) on instruments (23) (4) (69) (20)
Gain (loss) on hedged items 22 4 69 20
Net Investment Hedges | Foreign Currency Debt        
Derivative Instruments, Gain (Loss) [Line Items]        
Notional value 590 1,190 590 1,190
Activity related to net investment hedges [Abstract]        
Gain (loss) on instruments (22) (13) (115) (36)
Gain (loss) on hedged items $ 22 $ 13 $ 115 $ 36