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Employee Benefit Plans - Pension Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 2,313 | $ 2,553
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward] |  |
Fair value of plan assets at beginning of year | 2,553 | 2,583
Fair value of plan assets at end of year | 2,313 | 2,553
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 806 | 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 | 745 |
Fair value of plan assets at end of year | 806 | 745
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,363 | 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 | 1,464 |
Fair value of plan assets at end of year | 1,363 | 1,464
Fair Value Measured at Net Asset Value Per Share |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 142 | 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 | 342 |
Fair value of plan assets at end of year | 142 | 342
Collective trust funds(a) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 806 | 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 | 745 |
Fair value of plan assets at end of year | 806 | 745
Collective trust funds(a) | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 806 | 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 | 745 |
Fair value of plan assets at end of year | 806 | 745
Collective trust funds(a) | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 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 | 0
Group annuity contract(b) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,363 | 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 | 1,464 |
Fair value of plan assets at end of year | 1,363 | 1,464
Group annuity contract(b) | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | 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 | 0
Group annuity contract(b) | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,363 | 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 | 1,464 | 0
Purchases | 0 | 1,430
Unrealized gain (loss) | (101) | 34
Fair value of plan assets at end of year | 1,363 | 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 | 2,169 | 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 | 2,209 |
Fair value of plan assets at end of year | 2,169 | 2,209
Accrued investment income and other receivables |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2 | 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 | 4 |
Fair value of plan assets at end of year | 2 | 4
Accured liabilities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0 | (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 | (2) |
Fair value of plan assets at end of year | $ 0 | $ (2)

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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