Financial Instruments - Fair Value Hedges (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative, Notional Amount	$ 1,200	$ 1,788
Average Maturity of Foreign Exchange Hedging Contracts - within Three Months	78.00%
Average Maturity of Foreign Exchange Hedging Contracts - within Three and Six Months	11.00%
Average Maturity of Foreign Exchange Hedging Contracts - within Six and Twelve Months	11.00%
Senior Notes Due 2021 [Member]
Derivative [Line Items]
Notional Amount	$ 300
Derivative Asset, Fair Value, Gross Asset (Liability)	$ (6)
Weighted Average Interest Rate Paid	3.03%
Interest Rate Received	4.50%
U.S. Dollar/Euro
Derivative [Line Items]
Change in Notional Value	$ (288)
Euro/U.K. Pound Sterling
Derivative [Line Items]
Change in Notional Value	$ (128)

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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-Section 13
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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Fair value of liability associated with 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.

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Nominal or face amount used to calculate payments on the derivative liability.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Average Maturity of Foreign Exchange Hedging Contracts - within Three and Six Months Outstanding average forward exchange and purchase option contracts that mature within six months.

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Average Maturity of Foreign Exchange Hedging Contracts - within Three Months. Outstanding average forward exchange and purchase option contracts that mature within three months.

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Change in Notional Value

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