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Insurance Liabilities - Net Loss Reserve Discount Benefit (Charge) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Net Loss Reserve Discount Benefit (Charge) [Line Items] |  |  |  |
Current accident year | $ 36 | $ 20 | $ 92 | $ 86
Accretion and other adjustments to prior year discount | (34) | (49) | (119) | (217)
Net reserve discount benefit (charge) | 2 | (29) | (27) | (131)
Change in discount on loss reserves ceded under retroactive reinsurance | 7 | 22 | 27 | 100
Net change in total reserve discount | 9 | (7) | 0 | (31)
United Kingdom |  |  |  |
Net Loss Reserve Discount Benefit (Charge) [Line Items] |  |  |  |
Net change in total reserve discount | $ (35) | $ 1 | $ (18) | $ 1

X
- Definition Represents the increase (decrease) in discount of loss reserves. + References No definition available. + Details
Name: | aig_IncreaseDecreaseInLossReserveDiscount
Namespace Prefix: | aig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the increase (decrease) in discount of loss reserves attributable to current accident year loss reserve activities. + References No definition available. + Details
Name: | aig_IncreaseDecreaseInLossReserveDiscountCurrentYear
Namespace Prefix: | aig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the net change in discount of loss reserves. + References No definition available. + Details
Name: | aig_IncreaseDecreaseInLossReserveDiscountIncludingReinsurance
Namespace Prefix: | aig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the increase (decrease) in discount of loss reserves attributable to prior year year loss reserve development and payout pattern + References No definition available. + Details
Name: | aig_IncreaseDecreaseInLossReserveDiscountPriorYear
Namespace Prefix: | aig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the increase (decrease) in discount of loss reserves due to reinsurance transaction. + References No definition available. + Details
Name: | aig_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseRetroactiveReinsuranceDiscount
Namespace Prefix: | aig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Net loss reserve discount benefit (charge) [Line Items] + References No definition available. + Details
Name: | aig_NetLossReserveDiscountBenefitChargeLineItems
Namespace Prefix: | aig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |