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Basis Of Presentation Derivative Instruments (Details) - Interest Rate Swap - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Aug. 07, 2020 | Dec. 31, 2019
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | $ 1,000 |  | $ 1,000 |  |  |
Not Designated as Hedging Instrument | Interest expense |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Loss Recognized on Derivatives | 0 | $ 12 | 59 | $ 50 |  |
Not Designated as Hedging Instrument | Other current and non-current liabilities |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest rate swap contract - other current and non-current liabilities | 94 |  | 94 |  |  | $ 47
August 2015 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | $ 600 |
November 2017 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | 450 |  | 450 |  |  |
August 2020 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | 400 |  | 400 |  |  |
November 2022 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | $ 150 |  | $ 150 |  |  |

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