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Basis Of Presentation Derivative Instruments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Feb. 10, 2018 | Dec. 31, 2017
Foreign Exchange Contract |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Fair value of derivative instrument |  | $ 1 |  | $ 1 |  |  |
Notional amount of derivative instrument |  | 23 |  | 23 |  |  | $ 25
Foreign Exchange Contract | Not Designated as Hedging Instrument | Operating Expense |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
(Gain) or Loss Recognized on Derivatives |  | (1) | $ 1 | (1) | $ 1 |  |
Foreign Exchange Contract | Maximum |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Fair value of derivative instrument |  |  |  |  |  |  | 1
Interest Rate Swap |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional amount of derivative instrument |  | 1,600 |  | 1,600 |  |  |
Interest Rate Swap | Not Designated as Hedging Instrument | Interest Expense |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
(Gain) or Loss Recognized on Derivatives |  | 0 | $ 5 | (12) | $ 4 |  |
Interest Rate Swap | Not Designated as Hedging Instrument | Other Non-Current Assets |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 12 |  | 12 |  |  | 0
Interest Rate Swap | Not Designated as Hedging Instrument | Other Current and Non-Current Liabilities |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Fair value of interest rate swap contracts |  | 7 |  | 7 |  |  | $ 13
Interest Rate Swap | July 2012 and January 2013 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional amount of derivative instrument |  |  |  |  |  | $ 425 |
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 |  |  |
Interest Rate Swap | August 2020 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional amount of derivative instrument | [1] | 400 |  | 400 |  |  |
Interest Rate Swap | November 2022 |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional amount of derivative instrument | [1] | 150 |  | 150 |  |  |
New Interest Rate Swap Notional Value of $125 million |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional amount of derivative instrument | [1] | 125 |  | 125 |  |  |
New Interest Rate Swap Notional Value of $150 million |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Notional amount of derivative instrument | [1] | $ 150 |  | $ 150 |  |  |
[1] | (a)During the second quarter of 2018, the Company entered into four new forward starting interest rate swaps, two with a notional value of $125 million and two with a notional value of $150 million.

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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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