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Basis Of Presentation Derivative Instruments (Details) - Interest Rate Swap - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Derivative [Line Items] |  |  |
Derivative, Notional Amount | $ 1,000 |  |
Not Designated as Hedging Instrument | Interest expense |  |  |
Derivative [Line Items] |  |  |
Derivative, Gain (Loss) on Derivative, Net | (13) | $ 51 |
Not Designated as Hedging Instrument | Other non-current liabilities |  |  |
Derivative [Line Items] |  |  |
Interest rate swap contract - other current and non-current liabilities | 63 |  | $ 81
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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