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Insurance Liabilities - Discounting of Reserves (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2023
Discounting of Reserves [Line Items] |  |
U.S. workers' compensation | $ 2,235,000,000 | $ 2,337,000,000
Retroactive reinsurance | (1,026,000,000) | (1,104,000,000)
Total reserve discount | 1,209,000,000 | 1,233,000,000
Fortitude RE |  |
Discounting of Reserves [Line Items] |  |
Total reserve discount | $ 673,000,000 | $ 687,000,000
Discount ceded on sale (as a percent) | 100.00% | 100.00%
United Kingdom |  |
Discounting of Reserves [Line Items] |  |
Total reserve discount | $ 196,000,000 | $ 196,000,000

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | aig_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the discount of loss reserves to present value for claims that won't be paid for an extended period of time. + References No definition available. + Details
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Namespace Prefix: | aig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Percent Of Discount Ceded + References No definition available. + Details
Name: | aig_PercentOfDiscountCeded
Namespace Prefix: | aig_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Retroactive Reinsurance Discount, Amount + References No definition available. + Details
Name: | aig_RetroactiveReinsuranceDiscountAmount
Namespace Prefix: | aig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Workers Compensation Discount, Value Amount + References No definition available. + Details
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Namespace Prefix: | aig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_GB
Namespace Prefix: |
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