Fair Value Measurements and Financial Instruments - Fair Value of Derivative Instruments and Other Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Other financial instruments
Total other financial instruments	$ 10	$ 14
Other current assets
Other financial instruments
Marketable securities	10	14
Designated derivative instruments
Designated derivative instruments
Derivative assets	20	25
Derivative liabilities	38	73
Designated derivative instruments \| Interest rate swap contracts \| Other current assets
Designated derivative instruments
Derivative assets	0	0
Designated derivative instruments \| Interest rate swap contracts \| Other accruals
Designated derivative instruments
Derivative liabilities	1	0
Designated derivative instruments \| Interest rate swap contracts \| Other assets
Designated derivative instruments
Derivative assets	0	0
Designated derivative instruments \| Interest rate swap contracts \| Other liabilities
Designated derivative instruments
Derivative liabilities	8	7
Designated derivative instruments \| Foreign currency contracts \| Other current assets
Designated derivative instruments
Derivative assets	20	25
Designated derivative instruments \| Foreign currency contracts \| Other accruals
Designated derivative instruments
Derivative liabilities	8	20
Designated derivative instruments \| Foreign currency contracts \| Other assets
Designated derivative instruments
Derivative assets	0	0
Designated derivative instruments \| Foreign currency contracts \| Other liabilities
Designated derivative instruments
Derivative liabilities	21	46
Designated derivative instruments \| Commodity contracts \| Other current assets
Designated derivative instruments
Derivative assets	0	0
Designated derivative instruments \| Commodity contracts \| Other accruals
Designated derivative instruments
Derivative liabilities	$ 0	$ 0

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Amount of investment in marketable security.

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