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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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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- Definition

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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- Definition

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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Derivative Instruments (Details) - USD ($) $ in Millions	12 Months Ended
Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest rate swap contracts
Derivative [Line Items]
Notional value of derivative instrument	$ 1,475
Foreign exchange contracts
Derivative [Line Items]
Notional value of derivative instrument	29	$ 33
Maximum [Member] \| Foreign exchange contracts
Derivative [Line Items]
Fair value of derivative instrument	2	1
Not Designated as Hedging Instruments \| Interest expense \| Interest rate swap contracts
Derivative [Line Items]
(Gain) or Loss Recognized on Derivatives	6	20	$ 32
Not Designated as Hedging Instruments \| Operating expense \| Foreign exchange contracts
Derivative [Line Items]
(Gain) or Loss Recognized on Derivatives	(2)	(2)	$ (3)
Other non-current liabilities \| Not Designated as Hedging Instruments \| Interest rate swap contracts
Derivative [Line Items]
Fair value of interest rate derivative liabilities	33	$ 47
July 2012 [Member] \| Interest rate swap contracts
Derivative [Line Items]
Notional value of derivative instrument	225
January 2013 [Member] \| Interest rate swap contracts
Derivative [Line Items]
Notional value of derivative instrument	200
August 2015 [Member] \| Interest rate swap contracts
Derivative [Line Items]
Notional value of derivative instrument	600
November 2017 [Member] \| Interest rate swap contracts
Derivative [Line Items]
Notional value of derivative instrument	$ 450