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Nominal or face amount used to calculate payments on the derivative asset.

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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jul. 09, 2020	Apr. 29, 2020
Interest Rate Swap \| Cash Flow Hedging \| Designated as Hedging Instrument
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative notional value	$ 91	$ 80	$ 500	$ 250
Growth-Oriented
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Target allocation percentage of pension plan assets	60.00%
Immunizing
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Target allocation percentage of pension plan assets	40.00%
Partnerships
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net asset value, redemption restriction period	15 days
Commingled and Common Collective Trust Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net asset value, redemption restriction period	30 days