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Employee Benefits - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, maximum annual contributions per employee, percent | 6.00% |  |
AIG Incentive Saving Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer match to employee contribution (as a percent) | 100.00% |  |
Employer matching contribution,, percentage of employees' gross pay (as a percent) | 6.00% |  |
Additional employer matching contribution, actual matching percentage of participant's contribution (as a percent) | 3.00% |  |
Defined contribution plans, costs | $ 87 | $ 95 | $ 100
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Shares of common stock included in pension plan assets (in shares) | 0 | 0 |
Long-term strategic asset allocation review period (approximately) | 3 years |  |
Expected return on assets | 6.50% | 6.25% |
Plan assets. actual allocation percentage | 100.00% | 100.00% |
Foreign Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Shares of common stock included in pension plan assets (in shares) | 0 | 0 |
Plan assets. actual allocation percentage | 100.00% | 100.00% |
Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan effect of one hundred basis point increase in expected long term rate | $ 35 |  |
Defined benefit plan effect of one hundred basis point increase in discount rate | 2 |  |
Defined benefit plan effect of one hundred basis point decrease in discount rate | 3 |  |
Defined benefit plan effect of one hundred basis point decrease in expected long term rate of return | 35 |  |
Expected annual pension contributions | $ 53 |  |
Pension | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan maximum period for calculating unreduced benefits | 44 years |  |
Discount rate | 5.57% | 4.98% |
Expected return on assets | 6.50% | 6.25% | 4.65%
Pension | Foreign Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 2.87% | 2.85% |
Expected return on assets | 2.77% | 2.67% | 1.84%
Pension | Japan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of projected benefit obligation to total projected benefit obligations | 50.00% | 54.00% |
Defined benefit plan, weighted-average discount rate | 1.81% | 1.48% |
Expected return on assets | 1.85% | 1.85% |
Plan assets. actual allocation percentage | 66.00% | 67.00% |
Postretirement benefit plans | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan eligibility age | 55 years |  |
Defined benefit plan requisite service period | 10 years |  |
Discount rate | 5.53% | 4.97% |
Expected return on assets |  | 0.00% |
Postretirement benefit plans | Foreign Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rate | 4.97% | 5.37% |
Postretirement Health Coverage | U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan requisite service period | 5 years |  |

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