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Basis Of Presentation Derivative Instruments (Details) - Interest Rate Swap - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount |  | $ 1,600 |  | $ 1,600 |  |
Not Designated as Hedging Instrument | Interest expense |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Loss Recognized on Derivatives |  | 8 | $ 24 | 59 | $ 38 |
Not Designated as Hedging Instrument | Other current and non-current liabilities |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Interest rate swap contract - other current and non-current liabilities |  | 99 |  | 99 |  | $ 47
August 2015 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | [1] | 600 |  | 600 |  |
November 2017 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount |  | 450 |  | 450 |  |
August 2020 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | [1] | 400 |  | 400 |  |
November 2022 |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount |  | $ 150 |  | $ 150 |  |
[1] | Interest rate swaps with a notional value of $600 million expire on August 7, 2020, and interest rate swaps with a notional value of $400 million commence on August 14, 2020.

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