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Basis Of Presentation Derivative Instruments (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Feb. 10, 2018	Dec. 31, 2017
Foreign Exchange Contract
Derivative [Line Items]
Fair value of derivative instrument		$ 1		$ 1
Notional amount of derivative instrument		23		23			$ 25
Foreign Exchange Contract | Not Designated as Hedging Instrument | Operating Expense
Derivative [Line Items]
(Gain) or Loss Recognized on Derivatives		(1)	$ 1	(1)	$ 1
Foreign Exchange Contract | Maximum
Derivative [Line Items]
Fair value of derivative instrument							1
Interest Rate Swap
Derivative [Line Items]
Notional amount of derivative instrument		1,600		1,600
Interest Rate Swap | Not Designated as Hedging Instrument | Interest Expense
Derivative [Line Items]
(Gain) or Loss Recognized on Derivatives		0	$ 5	(12)	$ 4
Interest Rate Swap | Not Designated as Hedging Instrument | Other Non-Current Assets
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset		12		12			0
Interest Rate Swap | Not Designated as Hedging Instrument | Other Current and Non-Current Liabilities
Derivative [Line Items]
Fair value of interest rate swap contracts		7		7			$ 13
Interest Rate Swap | July 2012 and January 2013
Derivative [Line Items]
Notional amount of derivative instrument						$ 425
Interest Rate Swap | August 2015
Derivative [Line Items]
Notional amount of derivative instrument		600		600
Interest Rate Swap | November 2017
Derivative [Line Items]
Notional amount of derivative instrument		450		450
Interest Rate Swap | August 2020
Derivative [Line Items]
Notional amount of derivative instrument	[1]	400		400
Interest Rate Swap | November 2022
Derivative [Line Items]
Notional amount of derivative instrument	[1]	150		150
New Interest Rate Swap Notional Value of $125 million
Derivative [Line Items]
Notional amount of derivative instrument	[1]	125		125
New Interest Rate Swap Notional Value of $150 million
Derivative [Line Items]
Notional amount of derivative instrument	[1]	$ 150		$ 150
[1] (a)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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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