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Lending Activities - Rollforward of the Changes in the Allowance for Credit Losses on Mortgage and Other Loans Receivable (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Changes in the allowance for losses on Mortgage and other loans receivable |  |  |
Allowance, beginning of year | $ 37,776 | $ 117 | $ 134
Loans charged off |  |  | (4)
Net charge-offs |  |  | (4)
Addition to (release of) allowance for loan losses |  |  | (13)
Allowance, end of year | 37,800 | 37,776 | 117
Commercial mortgage loans |  |  |
Changes in the allowance for losses on Mortgage and other loans receivable |  |  |
Allowance, beginning of year | 138 | 109 | 123
Loans charged off | 0 | (2) | (4)
Net charge-offs | 0 | (2) | (4)
Addition to (release of) allowance for loan losses | 25 | 31 | (10)
Allowance, end of year | 163 | 138 | 109
Off-balance-sheet commitments | 8 | 9 | 9
Other Loans |  |  |
Changes in the allowance for losses on Mortgage and other loans receivable |  |  |
Allowance, beginning of year | 2 | 8 | 11
Loans charged off | 0 | 0 | 0
Net charge-offs | 0 | 0 | 0
Addition to (release of) allowance for loan losses | (1) | (6) | (3)
Allowance, end of year | 1 | 2 | 8
Excluding AIGFP Operating |  |  |
Changes in the allowance for losses on Mortgage and other loans receivable |  |  |
Allowance, beginning of year | 140 | 117 |
Loans charged off | 0 | (2) |
Net charge-offs | 0 | (2) |
Addition to (release of) allowance for loan losses | 24 | 25 |
Allowance, end of year | $ 164 | $ 140 | $ 117

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Definition Amount, excluding accrued interest, of decrease (increase) in allowance for credit loss on financing receivable from writeoff (recovery). Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Definition Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482454/460-10-45-1 + Details
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