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Derivative Instruments (Designated Interest Rate Hedge) (Details) - Interest rate swap liability - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative Asset | $ 0 | $ 0
Other noncurrent assets |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 10 | 9
Long-term Debt |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative Asset, Fair Value, Gross Liability | (10) | (9)
Designated as Hedging Instrument | Fair Value Hedging |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Derivative, Notional Amount | $ 500 | $ 500

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