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Segment Information - Schedule of Continuing Operations by Operating Segment (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Net Premiums Earned | $ 23,537 | $ 25,564 | $ 26,765
Loss and Loss Adjustment Expenses Incurred | 14,567 | 15,393 | 15,461
Amortization of DAC | 3,425 | 3,771 | 3,545
General Operating Expense | 5,529 | 5,399 | 6,159
Net Investment Income | 4,255 | 3,446 | 2,370
Income from continuing operations before income tax expense | 3,870 | 2,867 | 3,772
Interest expense | 462 | 516 | 603
Changes in the fair values of equity securities, AIG's investment in Corebridge and gain on sale of shares | 586 | 53 | 29
Other income (expense) - net | 16 | 8 | 28
Gain (loss) on extinguishment of debt | (14) | 37 | (303)
Total net realized gains (losses) | (548) | (1,078) | 827
Net realized losses, net investment income | 8 | (12) | (61)
Net realized losses, reconciliation to income (loss) from continuing operations before income tax expense | (428) | (743) | (268)
Net gain (loss) on divestitures and other | 616 | (29) | (153)
Non-operating litigation reserves and settlements, reconciliation to income (loss) from continuing operations before income tax expense |  | (1) | 16
(Unfavorable) favorable prior year development and related amortization changes ceded under retroactive reinsurance agreements | (105) | 62 | 160
Net loss reserve discount benefit (charge) | (226) | (195) | 703
Pension expense related to lump sum payments to former employees |  | (71) | (59)
Net results of businesses in run-off, net investment income | 17 | 21 | 6
Net results of businesses in run-off, net investment income, reconciliation to income (loss) from continuing operations before income tax expense | (111) | (31) | 25
Integration and transaction costs associated with acquiring or divesting businesses | (39) | (6) | (12)
Restructuring and other costs | $ (745) | $ (356) | $ (423)
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] | General Operating Expense | General Operating Expense | General Operating Expense
Non-recurring costs related to regulatory or accounting changes | $ (18) | $ (22) | $ (26)
Net impact from elimination of international reporting lag, net investment income |  | 1 | 41
Net impact from elimination of international reporting lag, reconciliation to income (loss) from continuing operations before income tax expense |  | 12 | 127
Fortitude Re funds withheld assets |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Investment Income | 144 | 180 | 53
Total net realized gains (losses) | (39) | (71) | (99)
Fortitude Re funds withheld embedded derivative |  |  |
Segment Reporting Information [Line Items] |  |  |
Total net realized gains (losses) | (75) | (273) | 1,133
Total |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Investment Income | 3,484 | 3,195 | 2,274
Income from continuing operations before income tax expense | 4,324 | 4,321 | 2,869
Reportable Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Premiums Written | 23,902 | 26,719 | 25,512
Net Premiums Earned | 23,457 | 25,091 | 25,340
Loss and Loss Adjustment Expenses Incurred | 14,038 | 14,775 | 15,407
Amortization of DAC | 3,413 | 3,623 | 3,533
Other Acquisition Cost | 1,137 | 1,279 | 1,365
General Operating Expense | 2,952 | 3,065 | 2,987
Underwriting Income (Loss) | 1,917 | 2,349 | 2,048
Net Investment Income | 3,060 | 3,022 | 2,382
Income from continuing operations before income tax expense | 4,977 | 5,371 | 4,430
Interest expense | (445) | (498) | (624)
Other Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Premiums Earned | 0 | 3 | 937
Net Investment Income | 424 | 186 | (122)
Income from continuing operations before income tax expense | (207) | (535) | (1,000)
Elimination and consolidations |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Premiums Earned | (3) | (5) | 10
Net Investment Income |  | (13) | 14
Income from continuing operations before income tax expense | (1) | (17) | 63
North America Commercial | Reportable Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Premiums Written | 8,452 | 11,432 | 10,899
Net Premiums Earned | 8,172 | 10,233 | 10,444
Loss and Loss Adjustment Expenses Incurred | 5,713 | 6,323 | 7,218
Amortization of DAC | 824 | 1,371 | 1,381
Other Acquisition Cost | 222 | 231 | 174
General Operating Expense | 865 | 953 | 927
Underwriting Income (Loss) | 548 | 1,355 | 744
International Commercial | Reportable Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Premiums Written | 8,364 | 8,168 | 7,877
Net Premiums Earned | 8,145 | 7,964 | 7,701
Loss and Loss Adjustment Expenses Incurred | 4,463 | 4,641 | 4,301
Amortization of DAC | 1,018 | 943 | 938
Other Acquisition Cost | 342 | 350 | 378
General Operating Expense | 1,095 | 1,028 | 945
Underwriting Income (Loss) | 1,227 | 1,002 | 1,139
Global Personal | Reportable Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Premiums Written | 7,086 | 7,119 | 6,736
Net Premiums Earned | 7,140 | 6,894 | 7,195
Loss and Loss Adjustment Expenses Incurred | 3,862 | 3,811 | 3,888
Amortization of DAC | 1,571 | 1,309 | 1,214
Other Acquisition Cost | 573 | 698 | 813
General Operating Expense | 992 | 1,084 | 1,115
Underwriting Income (Loss) | $ 142 | $ (8) | $ 165

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