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Derivative Instruments (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 07, 2020
Interest rate swap contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | $ 1,000 |  |  |
Interest rate swap contracts | Not Designated as Hedging Instruments | Interest expense |  |  |  |
Derivative [Line Items] |  |  |  |
Loss or (Gain) Recognized on Derivatives | 51 | $ 39 | $ 4 |
Interest rate swap contracts | Other current and non-current liabilities | Not Designated as Hedging Instruments |  |  |  |
Derivative [Line Items] |  |  |  |
Fair value of interest rate derivative liabilities | 81 | 47 |  |
Interest rate swap contracts | August 2015 |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount |  |  |  | $ 600
Interest rate swap contracts | November 2017 |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 450 |  |  |
Interest rate swap contracts | August 2020 |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 400 |  |  |
Interest rate swap contracts | November 2022 |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | 150 |  |  |
Foreign exchange contracts | Not Designated as Hedging Instruments | Operating expense |  |  |  |
Derivative [Line Items] |  |  |  |
Loss or (Gain) Recognized on Derivatives | $ 0 | $ 0 | $ (1) |

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