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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 |  |  |

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