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Basis Of Presentation Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Foreign Exchange Contract
Derivative [Line Items]
Notional amount of derivative instrument	$ 27		$ 29
Foreign Exchange Contract | Not Designated as Hedging Instrument [Member] | Operating Expense [Member]
Derivative [Line Items]
(Gain) or Loss Recognized on Derivatives	0	$ 0
Foreign Exchange Contract | Maximum
Derivative [Line Items]
Fair value of derivative instrument	1		2
Interest Rate Swap
Derivative [Line Items]
Notional amount of derivative instrument	1,475
Interest Rate Swap | Not Designated as Hedging Instrument [Member] | Interest Expense [Member]
Derivative [Line Items]
(Gain) or Loss Recognized on Derivatives	(1)	$ 31
Interest Rate Swap | Not Designated as Hedging Instrument [Member] | Other Non-Current Liabilities [Member]
Derivative [Line Items]
Fair value of interest rate swap contracts	27		$ 33
Interest Rate Swap | July 2012
Derivative [Line Items]
Notional amount of derivative instrument	225
Interest Rate Swap | January 2013
Derivative [Line Items]
Notional amount of derivative instrument	200
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 860
-SubTopic 20
-Section 50
-Paragraph 4D
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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