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Derivative Instruments (Details) - Interest rate swap contracts - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 1,600 |  |
Not Designated as Hedging Instruments | Interest expense |  |  |
Derivative [Line Items] |  |  |
(Gain) or Loss Recognized on Derivatives | 39 | $ 4 | $ (4)
Other non-current assets | Not Designated as Hedging Instruments |  |  |
Derivative [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 | 6 |
Other current and non-current liabilities | Not Designated as Hedging Instruments |  |  |
Derivative [Line Items] |  |  |
Fair value of interest rate derivative liabilities | 47 | $ 16 |
August 2015 |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 600 |  |
November 2017 |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 450 |  |
August 2020 |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 400 |  |
November 2022 |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 150 |  |

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