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Insurance Liabilities - Net Loss Reserve Discount Benefit (Charge) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Net Loss Reserve Discount Benefit (Charge) [Line Items] |  |  |
Current accident year | $ 128 | $ 112 | $ 98
Accretion and other adjustments to prior year discount | (303) | (264) | (239)
Net reserve discount benefit (charge) | (226) | (195) | 703
Change in discount on loss reserves ceded under retroactive reinsurance | 168 | 150 | (301)
Net change in total reserve discount | (58) | (45) | 402
North America Commercial Insurance |  |  |
Net Loss Reserve Discount Benefit (Charge) [Line Items] |  |  |
Effect of interest rate changes | (51) | (43) | 844
United Kingdom |  |  |
Net Loss Reserve Discount Benefit (Charge) [Line Items] |  |  |
Net change in total reserve discount | $ (12) | $ 61 | $ 19

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

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- Definition Increase (Decrease) In Loss Reserve Discount, Effect Of Interest Rate Changes + References No definition available. + Details
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Namespace Prefix: | aig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

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- Details
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