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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

X

- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Nominal or face amount used to calculate payment on derivative.

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