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Employee Benefits - Schedule of Funded Status of the Plans Reconciled to the Amount Reported in the Balance Sheets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
U.S. Plans | Pension |  |  |
Change in projected benefit obligation: |  |  |
Benefit obligation, beginning of year | $ 3,301 | $ 3,475 |
Service cost | 4 | 5 | $ 6
Interest cost | 154 | 168 | 109
Actuarial gain (loss) | (200) | 75 |
AIG assets | (17) | (16) |
Plan assets | (280) | (171) |
Plan amendment | 0 | 0 |
Settlements | 0 | (234) |
Foreign exchange effect | 0 | 0 |
Other | 0 | (1) |
Projected benefit obligation, end of year | 2,962 | 3,301 | 3,475
Change in plan assets: |  |  |
Fair value of plan assets, beginning of year | 3,228 | 3,345 |
Actual return on plan assets, net of expenses | 28 | 288 |
AIG contributions | 17 | 16 |
AIG assets | (17) | (16) |
Plan assets | (280) | (171) |
Settlements | 0 | (234) |
Foreign exchange effect | 0 | 0 |
Fair value of plan assets, end of year | 2,976 | 3,228 | 3,345
Funded status, end of year | 14 | (73) |
Amounts recognized in the balance sheet: |  |  |
Assets | 184 | 110 |
Liabilities | (170) | (183) |
Total amounts recognized | 14 | (73) |
Pre-tax amounts recognized in AOCI: |  |  |
Net gain (loss) | (1,082) | (1,142) |
Prior service (cost) credit | 0 | 0 |
Total amounts recognized | (1,082) | (1,142) |
U.S. Plans | Pension | Defined Benefit Plan, Unfunded Plan |  |  |
Change in projected benefit obligation: |  |  |
Benefit obligation, beginning of year | 184 |  |
Projected benefit obligation, end of year | 170 | 184 |
U.S. Plans | Postretirement benefit plans |  |  |
Change in projected benefit obligation: |  |  |
Benefit obligation, beginning of year | 97 | 99 |
Service cost | 0 | 0 | 1
Interest cost | 4 | 5 | 3
Actuarial gain (loss) | (4) | 3 |
AIG assets | (10) | (10) |
Plan assets | 0 | 0 |
Plan amendment | 0 | 0 |
Settlements | 0 | 0 |
Foreign exchange effect | 0 | 0 |
Other | 0 | 0 |
Projected benefit obligation, end of year | 87 | 97 | 99
Change in plan assets: |  |  |
Fair value of plan assets, beginning of year | 0 | 0 |
Actual return on plan assets, net of expenses | 0 | 0 |
AIG contributions | 10 | 10 |
AIG assets | (10) | (10) |
Plan assets | 0 | 0 |
Settlements | 0 | 0 |
Foreign exchange effect | 0 | 0 |
Fair value of plan assets, end of year | 0 | 0 | 0
Funded status, end of year | (87) | (97) |
Amounts recognized in the balance sheet: |  |  |
Assets | 0 | 0 |
Liabilities | (87) | (97) |
Total amounts recognized | (87) | (97) |
Pre-tax amounts recognized in AOCI: |  |  |
Net gain (loss) | 28 | 28 |
Prior service (cost) credit | 0 | 0 |
Total amounts recognized | 28 | 28 |
Foreign Plan | Pension |  |  |
Change in projected benefit obligation: |  |  |
Benefit obligation, beginning of year | 804 | 810 |
Service cost | 14 | 16 | 18
Interest cost | 20 | 20 | 9
Actuarial gain (loss) | 14 | (8) |
AIG assets | (9) | (10) |
Plan assets | (28) | (31) |
Plan amendment | 1 | (1) |
Settlements | (9) | (1) |
Foreign exchange effect | (60) | 9 |
Other | 0 | 0 |
Projected benefit obligation, end of year | 747 | 804 | 810
Change in plan assets: |  |  |
Fair value of plan assets, beginning of year | 734 | 709 |
Actual return on plan assets, net of expenses | 35 | 15 |
AIG contributions | 42 | 47 |
AIG assets | (9) | (10) |
Plan assets | (28) | (31) |
Settlements | (9) | (1) |
Foreign exchange effect | (61) | 5 |
Fair value of plan assets, end of year | 704 | 734 | 709
Funded status, end of year | (43) | (70) |
Amounts recognized in the balance sheet: |  |  |
Assets | 122 | 97 |
Liabilities | (165) | (167) |
Total amounts recognized | (43) | (70) |
Pre-tax amounts recognized in AOCI: |  |  |
Net gain (loss) | (72) | (79) |
Prior service (cost) credit | (18) | (21) |
Total amounts recognized | (90) | (100) |
Foreign Plan | Pension | Defined Benefit Plan, Unfunded Plan |  |  |
Change in projected benefit obligation: |  |  |
Benefit obligation, beginning of year | 140 |  |
Projected benefit obligation, end of year | 139 | 140 |
Foreign Plan | Postretirement benefit plans |  |  |
Change in projected benefit obligation: |  |  |
Benefit obligation, beginning of year | 31 | 32 |
Service cost | 0 | 0 | 0
Interest cost | 2 | 2 | 1
Actuarial gain (loss) | 0 | (2) |
AIG assets | (1) | (1) |
Plan assets | 0 | 0 |
Plan amendment | 0 | 0 |
Settlements | 0 | 0 |
Foreign exchange effect | (2) | 0 |
Other | 0 | 0 |
Projected benefit obligation, end of year | 30 | 31 | 32
Change in plan assets: |  |  |
Fair value of plan assets, beginning of year | 0 | 0 |
Actual return on plan assets, net of expenses | 0 | 0 |
AIG contributions | 1 | 1 |
AIG assets | (1) | (1) |
Plan assets | 0 | 0 |
Settlements | 0 | 0 |
Foreign exchange effect | 0 | 0 |
Fair value of plan assets, end of year | 0 | 0 | $ 0
Funded status, end of year | (30) | (31) |
Amounts recognized in the balance sheet: |  |  |
Assets | 0 | 0 |
Liabilities | (30) | (31) |
Total amounts recognized | (30) | (31) |
Pre-tax amounts recognized in AOCI: |  |  |
Net gain (loss) | 21 | 23 |
Prior service (cost) credit | 0 | 1 |
Total amounts recognized | $ 21 | $ 24 |

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