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Employee Benefit Plans - Schedule of Components of Retirement Plan Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pre-tax comprehensive loss (income) | $ (15) | $ 88 | $ (140)
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost (benefits earned during the period) | $ 46 | $ 41 | $ 48
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense)
Interest cost | $ 79 | $ 76 | $ 48
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense)
Expected return on plan assets | $ (89) | $ (83) | $ (79)
Settlement charges | 2 | 0 | 0
Curtailments | $ 0 | $ 0 | $ (2)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense)
Amortization of actuarial loss | $ 5 | $ 3 | $ 17
Amortization of prior service cost (credit) | (20) | (20) | (20)
Net periodic defined benefit plan expense | 23 | 17 | 12
Defined contribution plans | 76 | 73 | 67
Total retirement plan expense | 99 | 90 | 79
Net actuarial loss (gain) | (38) | 46 | (88)
Prior service cost | 26 | 19 | 20
Total pre-tax comprehensive loss (income) | (12) | 65 | (68)
Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost (benefits earned during the period) | $ 0 | $ 0 | $ 1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense)
Interest cost | $ 5 | $ 6 | $ 3
Expected return on plan assets | 0 | 0 | 0
Settlement charges | 0 | 0 | 0
Curtailments | $ 0 | $ 0 | $ 0
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense)
Amortization of actuarial loss | $ 3 | $ 2 | $ 5
Amortization of prior service cost (credit) | 0 | 0 | 0
Net periodic defined benefit plan expense | 8 | 8 | 9
Defined contribution plans | 0 | 0 | 0
Total retirement plan expense | 8 | 8 | 9
Net actuarial loss (gain) | (5) | 4 | (29)
Prior service cost | 0 | 0 | 0
Total pre-tax comprehensive loss (income) | $ (5) | $ 4 | $ (29)

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