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Investments - Composition of Current and Past Due Mortgage Loans on Real Estate (Details) - USD ($) | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit losses | $ (170,000,000) | $ (114,000,000)
Unamortized premium (discount) | 57,000,000 | 36,000,000
Mark-to-market gains (losses) | (33,000,000) | (38,000,000)
Total carrying value | 20,856,000,000 | 18,963,000,000
Loans with fair value option in non-accrual, amortized cost | 30,000,000 | 1,000,000
Loans with fair value option in non-accrual | 21,000,000 | 1,000,000
Loans with fair value option, 90 days past due and still accruing | 0 | 0
Current |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 20,748,000,000 | 18,921,000,000
30 to 59 days past due |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 119,000,000 | 89,000,000
60 to 89 days past due |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 20,000,000 | 9,000,000
90 or more days past due |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 115,000,000 | 60,000,000
Commercial |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit losses | (123,000,000) | (86,000,000)
Unamortized premium (discount) | (16,000,000) | (7,000,000)
Mark-to-market gains (losses) | (33,000,000) | (37,000,000)
Total carrying value | 17,652,000,000 | 17,187,000,000
Commercial | Current |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 17,684,000,000 | 17,256,000,000
Commercial | 30 to 59 days past due |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 85,000,000 | 61,000,000
Commercial | 60 to 89 days past due |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 0 | 0
Commercial | 90 or more days past due |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 55,000,000 | 0
Residential mortgage loans on real estate |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Allowance for credit losses | (47,000,000) | (28,000,000)
Unamortized premium (discount) | 73,000,000 | 43,000,000
Mark-to-market gains (losses) | 0 | (1,000,000)
Total carrying value | 3,204,000,000 | 1,776,000,000
Residential mortgage loans on real estate | Current |  |
Loans and Leases Receivable Disclosure [Line Items] |  |
Mortgage loans on real estate, gross | 3,064,000,000 | 1,665,000,000
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 | 34,000,000 | 28,000,000
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 | 20,000,000 | 9,000,000
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 | $ 60,000,000 | $ 60,000,000

X
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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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- Definition This item represents the aggregate fair value of loans held as assets that are 90 days or more past due 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 (e)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-28 + Details
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- Definition This item represents the aggregate fair value of loans held as assets that are in nonaccrual status for which the fair value option has been elected, if the entity's policy is to recognize interest income separately from other changes in fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (e)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-28 + Details
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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 of unamortized purchase premium (discount) on financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481598/310-20-45-1 + Details
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