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Other Postretirement Benefits - Schedule of Fair Values of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | $ 459 | $ 525 |  |
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 860 | 1,150 | $ 1,115 | $ 1,026
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 649 | 875 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 339 | 474 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 285 | 379 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 25 | 22 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 139 | 210 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Investments, Including Funds For Retiree Health Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 788 | 1,085 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Funds For Retiree Health Benefits Measured At Net Asset Value |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 51 | 48 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Pending Activities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 21 | 17 |  |
Other Postretirement Benefits | Level 1 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 10 | 0 |  |
Other Postretirement Benefits | Level 1 | Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Other Postretirement Benefits | Level 1 | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 10 | 0 |  |
Other Postretirement Benefits | Level 1 | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 0 |  |
Other Postretirement Benefits | Level 1 | Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 48 | 110 |  |
Other Postretirement Benefits | Level 1 | Investments, Including Funds For Retiree Health Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 58 | 110 |  |
Other Postretirement Benefits | Level 2 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 639 | 875 |  |
Other Postretirement Benefits | Level 2 | Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 339 | 474 |  |
Other Postretirement Benefits | Level 2 | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 275 | 379 |  |
Other Postretirement Benefits | Level 2 | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 25 | 22 |  |
Other Postretirement Benefits | Level 2 | Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 91 | 100 |  |
Other Postretirement Benefits | Level 2 | Investments, Including Funds For Retiree Health Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | $ 730 | $ 975 |  |

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