Derivative and Other Financial Instruments - Fair Values of Derivative Instruments and Valuation Hierarchy (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Derivative assets
Total	$ 44	$ 63
Derivative liabilities
Total	25	23
Fair Value, Inputs, Level 2
Derivative assets
Total	44	63
Derivative liabilities
Total	25	23
Fair Value, Inputs, Level 2 | Other current assets | Derivatives not designated as hedges
Derivative assets
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	3	28
Fair Value, Inputs, Level 2 | Accrued liabilities | Derivatives not designated as hedges
Derivative assets
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	2	16
Fair Value, Inputs, Level 2 | Other assets | Designated as Hedging Instrument
Derivative assets
Derivatives designated as hedges	41	35
Fair Value, Inputs, Level 2 | Other liabilities | Designated as Hedging Instrument
Derivative assets
Derivatives designated as hedges	23	7
Derivatives in cash flow hedges | Fair Value, Inputs, Level 2 | Other current assets | Foreign exchange | Designated as Hedging Instrument
Derivative assets
Derivatives designated as hedges	9	5
Derivatives in cash flow hedges | Fair Value, Inputs, Level 2 | Other current assets | Foreign exchange | Derivatives not designated as hedges
Derivative assets
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0	1
Derivatives in cash flow hedges | Fair Value, Inputs, Level 2 | Other current assets | Commodities | Designated as Hedging Instrument
Derivative assets
Derivatives designated as hedges, Commodities	17	25
Derivatives in cash flow hedges | Fair Value, Inputs, Level 2 | Other current assets | Commodities | Derivatives not designated as hedges
Derivative assets
Derivatives designated as hedges, Commodities	0	22
Derivatives in cash flow hedges | Fair Value, Inputs, Level 2 | Accrued liabilities | Foreign exchange | Designated as Hedging Instrument
Derivative assets
Derivatives designated as hedges	11	6
Derivatives in cash flow hedges | Fair Value, Inputs, Level 2 | Accrued liabilities | Foreign exchange | Derivatives not designated as hedges
Derivative assets
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	0	1
Derivatives in cash flow hedges | Fair Value, Inputs, Level 2 | Accrued liabilities | Commodities | Designated as Hedging Instrument
Derivative assets
Derivatives designated as hedges, Commodities	10	0
Derivatives in cash flow hedges | Fair Value, Inputs, Level 2 | Accrued liabilities | Commodities | Derivatives not designated as hedges
Derivative assets
Derivatives designated as hedges, Commodities	0	15
Derivatives in cash flow hedges | Fair Value, Inputs, Level 2 | Other non-current assets | Foreign exchange | Designated as Hedging Instrument
Derivative assets
Derivatives designated as hedges	1	0
Derivatives in cash flow hedges | Fair Value, Inputs, Level 2 | Other non-current assets | Commodities | Designated as Hedging Instrument
Derivative assets
Derivatives designated as hedges, Commodities	1	4
Derivatives in cash flow hedges | Fair Value, Inputs, Level 2 | Other non-current liabilities | Foreign exchange | Designated as Hedging Instrument
Derivative assets
Derivatives designated as hedges	0	0
Derivatives in cash flow hedges | Fair Value, Inputs, Level 2 | Other non-current liabilities | Commodities | Designated as Hedging Instrument
Derivative assets
Derivatives designated as hedges, Commodities	0	0
Derivatives in fair value hedges | Accrued liabilities | Designated as Hedging Instrument
Derivative liabilities
Derivatives designated as hedges, Foreign exchange	18	12
Derivatives in fair value hedges | Fair Value, Inputs, Level 2 | Other current assets | Foreign exchange | Designated as Hedging Instrument
Derivative assets
Derivatives designated as hedges	2	1
Derivatives in fair value hedges | Fair Value, Inputs, Level 2 | Other current assets | Foreign exchange | Derivatives not designated as hedges
Derivative assets
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	3	5
Derivatives in fair value hedges | Fair Value, Inputs, Level 2 | Accrued liabilities | Foreign exchange | Designated as Hedging Instrument
Derivative assets
Derivatives designated as hedges	2	1
Derivatives in fair value hedges | Fair Value, Inputs, Level 2 | Accrued liabilities | Foreign exchange | Derivatives not designated as hedges
Derivative assets
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value	2	0
Derivatives designated as net investment hedges | Fair Value, Inputs, Level 2 | Other non-current assets | Designated as Hedging Instrument
Derivative assets
Derivatives designated as hedges	11	0
Derivatives designated as net investment hedges | Fair Value, Inputs, Level 2 | Other non-current liabilities | Designated as Hedging Instrument
Derivative assets
Derivatives designated as hedges	$ 0	$ 0