Financial Instruments - Fair Value Hedges (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative notional value	$ 1,091
Senior Note 2021
Derivative [Line Items]
Derivative liability, notional amount	200	$ 300
Derivative, fair value, net	$ 1	$ (3)
Debt, weighted average interest rate (percentage)	3.35%
Debt instrument, interest rate, effective (percent)	4.50%
Interest rate swaps
Derivative [Line Items]
Derivative notional value, terminated early	$ 100

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Weighted average interest rate of debt outstanding.

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Nominal or face amount used to calculate payments on the derivative liability.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Nominal or face amount used to calculate payment on derivative.

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Derivative, Notional Amount, Terminated Early

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