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Other Postretirement Benefits - Schedule of Fair Values of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | $ 525 | $ 465 |  |
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 1,150 | 1,115 | $ 1,026 | $ 885
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 | 875 | 842 |  |
Other Postretirement Benefits | Fair Value, Inputs, Level 1 and 2 | Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 474 | 448 |  |
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 | 379 | 367 |  |
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 | 22 | 27 |  |
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 | 210 | 213 |  |
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 | 1,085 | 1,055 |  |
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 | 48 | 41 |  |
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 | 17 | 19 |  |
Other Postretirement Benefits | Level 1 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 0 | 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 | 0 | 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 | 110 | 116 |  |
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 | 110 | 116 |  |
Other Postretirement Benefits | Level 2 | Total investments |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 875 | 842 |  |
Other Postretirement Benefits | Level 2 | Equity |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 474 | 448 |  |
Other Postretirement Benefits | Level 2 | Other Fixed Income Debt |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 379 | 367 |  |
Other Postretirement Benefits | Level 2 | Cash and Cash Equivalents |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 22 | 27 |  |
Other Postretirement Benefits | Level 2 | Funds For Retiree Health Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total fair value of plan net assets | 100 | 97 |  |
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 | $ 975 | $ 939 |  |

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