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Employee Benefit Plans - Pension Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 2,553 | $ 3,457
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 2,583 |
Fair value of plan assets at end of year | 2,553 |
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 6 |
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 745 |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 1,858 |
Fair value of plan assets at end of year | 745 |
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,464 |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at end of year | 1,464 |
Fair Value Measured at Net Asset Value Per Share |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 342 |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 702 |
Fair value of plan assets at end of year | 342 |
Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 6 |
Fair value of plan assets at end of year | 0 |
Cash | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 6 |
Cash | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 |
Cash | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at end of year | 0 |
Collective trust funds(a) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 745 |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 1,858 |
Fair value of plan assets at end of year | 745 |
Collective trust funds(a) | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Collective trust funds(a) | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 745 |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 1,858 |
Fair value of plan assets at end of year | 745 |
Collective trust funds(a) | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at end of year | 0 |
Group annuity contract(b) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,464 |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 1,464 |
Group annuity contract(b) | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Group annuity contract(b) | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 |
Group annuity contract(b) | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,464 |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 0 |
Purchases | 1,430 |
Unrealized gain | 34 |
Fair value of plan assets at end of year | 1,464 |
Includes accrued liabilities and excludes accrued investment income and other receivables and investments measured at NAV |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2,209 |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 1,864 |
Fair value of plan assets at end of year | 2,209 |
Accrued investment income and other receivables |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 4 |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 42 |
Fair value of plan assets at end of year | 4 |
Accured liabilities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | (2) |
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | (25) |
Fair value of plan assets at end of year | $ (2) |

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