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Investments - Composition of Current and Past Due Mortgage Loans on Real Estate (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit losses | $ (115) | $ (114)
Unamortized premium (discount) | 41 | 36
Mark-to-market gains (losses) | (37) | (38)
Total carrying value | 19,266 | 18,963
Current |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 19,205 | 18,921
30 to 59 days past due |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 41 | 89
60 to 89 days past due |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 12 | 9
90 or more days past due |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 119 | 60
Commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit losses | (84) | (86)
Unamortized premium (discount) | (7) | (7)
Mark-to-market gains (losses) | (38) | (37)
Total carrying value | 17,309 | 17,187
Commercial | Current |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 17,372 | 17,256
Commercial | 30 to 59 days past due |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 4 | 61
Commercial | 60 to 89 days past due |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 2 | 0
Commercial | 90 or more days past due |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 60 | 0
Residential mortgage loans on real estate |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit losses | (31) | (28)
Unamortized premium (discount) | 48 | 43
Mark-to-market gains (losses) | 1 | (1)
Total carrying value | 1,957 | 1,776
Residential mortgage loans on real estate | Current |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 1,833 | 1,665
Residential mortgage loans on real estate | 30 to 59 days past due |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 37 | 28
Residential mortgage loans on real estate | 60 to 89 days past due |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 10 | 9
Residential mortgage loans on real estate | 90 or more days past due |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | $ 59 | $ 60

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- Definition This item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of loans and long-term receivables (other than securities categorized as trading, available-for-sale or held-to-maturity) that have contractual principal amounts and for which the fair value option has been elected. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-28 + Details
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