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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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-Section 13
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Fair value, before effects of master netting arrangements, of a financial liability or 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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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
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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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-Name Accounting Standards Codification
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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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No definition available.

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Basis Of Presentation Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Foreign Exchange Contract
Derivative [Line Items]
Notional amount of derivative instrument	$ 35		$ 35		$ 33
Foreign Exchange Contract \| Not Designated as Hedging Instrument [Member] \| Operating Expense [Member]
Derivative [Line Items]
(Gain) or Loss Recognized on Derivatives	(1)	$ 0	(1)	$ (1)
Foreign Exchange Contract \| Maximum
Derivative [Line Items]
Fair value of derivative instrument	1		1		1
Interest Rate Swap
Derivative [Line Items]
Notional amount of derivative instrument	1,475		1,475
Interest Rate Swap \| Not Designated as Hedging Instrument [Member] \| Interest Expense [Member]
Derivative [Line Items]
(Gain) or Loss Recognized on Derivatives	(5)	$ 16	40	$ 27
Interest Rate Swap \| Not Designated as Hedging Instrument [Member] \| Other Non-Current Liabilities [Member]
Derivative [Line Items]
Fair value of interest rate swap contracts	71		71		$ 47
Interest Rate Swap \| July 2012
Derivative [Line Items]
Notional amount of derivative instrument	225		225
Interest Rate Swap \| January 2013
Derivative [Line Items]
Notional amount of derivative instrument	200		200
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