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Derivative Instruments (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Foreign exchange contracts
Derivative [Line Items]
Notional value of derivative instrument		$ 27	$ 25
Foreign exchange contracts | Not Designated as Hedging Instruments | Operating expense
Derivative [Line Items]
(Gain) or Loss Recognized on Derivatives		(1)	2	$ (2)
Interest rate swap contracts
Derivative [Line Items]
Notional value of derivative instrument		1,600
Interest rate swap contracts | Not Designated as Hedging Instruments | Interest expense
Derivative [Line Items]
(Gain) or Loss Recognized on Derivatives		4	(4)	$ 6
Interest rate swap contracts | Other non-current assets | Not Designated as Hedging Instruments
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		6	0
Interest rate swap contracts | Other current and non-current liabilities | Not Designated as Hedging Instruments
Derivative [Line Items]
Fair value of interest rate derivative liabilities		16	13
Interest rate swap contracts | August 2015
Derivative [Line Items]
Notional value of derivative instrument		600
Interest rate swap contracts | November 2017
Derivative [Line Items]
Notional value of derivative instrument		450
Interest rate swap contracts | August 2020
Derivative [Line Items]
Notional value of derivative instrument	[1]	400
Interest rate swap contracts | November 2022
Derivative [Line Items]
Notional value of derivative instrument	[1]	150
New Interest Rate Swap Notional Value of $125 million
Derivative [Line Items]
Notional value of derivative instrument		125
New Interest Rate Swap Notional Value of $150 million
Derivative [Line Items]
Notional value of derivative instrument		150
Maximum | Foreign exchange contracts
Derivative [Line Items]
Fair value of derivative instrument		$ 1	$ 1
[1] During the second quarter of 2018, the Company entered into four new forward starting interest rate swaps, two with a notional value of $125 million and two with a notional value of $150 million.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Number 210
-Article 12
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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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