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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.

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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- 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

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 815
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Topic 825
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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
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-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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