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Fair Value Measurements - Postretirement Health Care Plan (Details) - Postretirement Health Care Benefits Plan - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | $ 134 | $ 186 | $ 181
Recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 134 | 186 |
Recurring | Total investment securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 132 | 184 |
Recurring | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 2 | 2 |
Recurring | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 71 | 95 |
Recurring | Government fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 7 | 18 |
Recurring | Corporate fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 39 | 51 |
Recurring | Short-term investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 8 | 15 |
Recurring | Private assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 5 | 3 |
Recurring | Accrued income receivable |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 2 |  |
Recurring | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets |  | 2 |
Level 1 | Recurring | Total investment securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 59 | 89 |
Level 1 | Recurring | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 2 | 2 |
Level 1 | Recurring | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 49 | 72 |
Level 1 | Recurring | Government fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Level 1 | Recurring | Corporate fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Level 1 | Recurring | Short-term investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 8 | 15 |
Level 1 | Recurring | Private assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Level 2 | Recurring | Total investment securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 68 | 92 |
Level 2 | Recurring | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Level 2 | Recurring | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 22 | 23 |
Level 2 | Recurring | Government fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 7 | 18 |
Level 2 | Recurring | Corporate fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 39 | 51 |
Level 2 | Recurring | Short-term investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Level 2 | Recurring | Private assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Level 3 | Recurring | Total investment securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 5 | 3 |
Level 3 | Recurring | Equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Level 3 | Recurring | Commingled funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Level 3 | Recurring | Government fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Level 3 | Recurring | Corporate fixed income securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Level 3 | Recurring | Short-term investment funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | 0 | 0 |
Level 3 | Recurring | Private assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value plan assets | $ 5 | $ 3 |

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