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Insurance Liabilities - Net Loss Reserve Discount Benefit (Charge) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Net Loss Reserve Discount Benefit (Charge) [Line Items] |  |  |  |
Current accident year | $ 36 | $ 38 | $ 66 | $ 68
Accretion and other adjustments to prior year discount | (62) | (54) | (168) | (148)
Net reserve discount benefit (charge) | (26) | (16) | (102) | (80)
Change in discount on loss reserves ceded under retroactive reinsurance | 23 | 26 | 78 | 96
Net change in total reserve discount | (3) | 10 | (24) | 16
United Kingdom |  |  |  |
Net Loss Reserve Discount Benefit (Charge) [Line Items] |  |  |  |
Net change in total reserve discount | $ 2 | $ 4 | $ 0 | $ 8

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: |