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Basis Of Presentation Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Feb. 10, 2018	Dec. 31, 2017
Foreign Exchange Contract
Derivative [Line Items]
Fair value of derivative instrument	$ 1
Notional amount of derivative instrument	26			$ 25
Foreign Exchange Contract | Maximum
Derivative [Line Items]
Fair value of derivative instrument				1
Interest Rate Swap
Derivative [Line Items]
Notional amount of derivative instrument	1,050
Interest Rate Swap | Not Designated as Hedging Instrument | Interest Expense
Derivative [Line Items]
Gain Recognized on Derivatives	(12)	$ (1)
Interest Rate Swap | Not Designated as Hedging Instrument | Other Non-Current Assets
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	9			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	6			$ 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
Interest Rate Swap | November 2017
Derivative [Line Items]
Notional amount of derivative instrument	$ 450

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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