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Fair Value Measurements and Financial Instruments - Schedule of Notional Values (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Fair Value Hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional value $ 1,108 $ 1,227
Fair Value Hedges | Foreign Currency Contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional value 708 327
Fair Value Hedges | Foreign Currency Debt    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional value 0 0
Fair Value Hedges | Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional value 400 900
Fair Value Hedges | Commodity Contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional value 0 0
Cash Flow Hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional value 803 796
Cash Flow Hedges | Foreign Currency Contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional value 791 782
Cash Flow Hedges | Foreign Currency Debt    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional value 0 0
Cash Flow Hedges | Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional value 0 0
Cash Flow Hedges | Commodity Contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional value 12 14
Net Investment Hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional value 2,702 1,878
Net Investment Hedges | Foreign Currency Contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional value 490 482
Net Investment Hedges | Foreign Currency Debt    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional value 2,212 1,396
Net Investment Hedges | Interest Rate Swaps    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional value 0 0
Net Investment Hedges | Commodity Contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Notional value $ 0 $ 0