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Derivative Instruments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Foreign exchange contracts |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of derivative instrument |  |  |  |  | $ 2 |  |  |  |  | $ 2 |
Notional value of derivative instrument |  | $ 25 |  |  | 29 |  |  |  | $ 25 | 29 |
Foreign exchange contracts | Not Designated as Hedging Instruments | Operating expense |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
(Gain) or Loss Recognized on Derivatives |  |  |  |  |  |  |  |  | 2 | (2) | $ (2)
Interest rate swap contracts |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional value of derivative instrument |  | 1,475 |  |  |  |  |  |  | 1,475 |  |
Interest rate swap contracts | Not Designated as Hedging Instruments | Interest Expense |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
(Gain) or Loss Recognized on Derivatives |  | (8) | $ 5 | $ (1) | (34) | $ (5) | $ 14 | $ 31 | (4) | 6 | $ 20
Interest rate swap contracts | Other non-current liabilities | Not Designated as Hedging Instruments |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of interest rate derivative liabilities |  | 13 |  |  | $ 33 |  |  |  | 13 | $ 33 |
Interest rate swap contracts | July 2012 |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional value of derivative instrument | [1],[2] | 225 |  |  |  |  |  |  | 225 |  |
Interest rate swap contracts | January 2013 |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional value of derivative instrument | [1],[2] | 200 |  |  |  |  |  |  | 200 |  |
Interest rate swap contracts | August 2015 |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional value of derivative instrument |  | 600 |  |  |  |  |  |  | 600 |  |
Interest rate swap contracts | November 2017 |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional value of derivative instrument | [1],[2] | 450 |  |  |  |  |  |  | 450 |  |
Interest rate swap contracts | July 2012 and January 2013 |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional value of derivative instrument |  | 425 |  |  |  |  |  |  | 425 |  |
Maximum | Foreign exchange contracts |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of derivative instrument |  | $ 1 |  |  |  |  |  |  | $ 1 |  |
[1] | (a)Interest rates swaps with a notional value of $425 million expired February 10, 2018, and interest rate swaps with a notional value of $450 million commenced in the fourth quarter of 2017.
[2] | Interest rates swaps with a notional value of $425 million expired February 10, 2018, and interest rate swaps with a notional value of $450 million commenced in the fourth quarter of 2017.

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- 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 + Details
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- Definition 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. + 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=82924980&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 + Details
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