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Mortgage Loans on Real Estate - Commercial Loan Portfolio Summary (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total, net of allowance | $ 90 | $ 27 |  |  |  |
Mortgage loans on real estate, at amortized cost |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | 11,954 | 5,711 |  |  |  |
Allowance for credit losses | (88) | (53) | $ (54) | $ (31) | $ (43) | $ (38)
Commercial Mortgage | Mortgage loans on real estate, at amortized cost |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | 9,169 | 5,711 |  |  |  |
Allowance for credit losses | (80) | (53) | $ (54) | $ (31) | $ (43) | $ (38)
Total, net of allowance | $ 9,089 | $ 5,658 |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 100.00% | 100.00% |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Apartment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 2,128 | $ 1,091 |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Apartment | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 23.20% | 19.10% |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Hotel |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 1,219 | $ 966 |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Hotel | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 13.30% | 16.90% |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 1,919 | $ 1,052 |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Industrial | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 20.90% | 18.40% |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Office |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 1,178 | $ 999 |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Office | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 12.90% | 17.50% |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Parking |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 331 | $ 414 |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Parking | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 3.60% | 7.20% |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Retail |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 1,527 | $ 781 |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Retail | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 16.70% | 13.70% |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Storage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 157 | $ 118 |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Storage | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 1.70% | 2.10% |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Agricultural |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 469 | $ 0 |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Agricultural | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 5.10% | 0.00% |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 241 | $ 290 |  |  |  |
Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Other | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 2.60% | 5.10% |  |  |  |
Pacific | Commercial Mortgage | Mortgage loans on real estate, at amortized cost |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 1,800 | $ 905 |  |  |  |
Pacific | Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 19.60% | 15.90% |  |  |  |
Mountain | Commercial Mortgage | Mortgage loans on real estate, at amortized cost |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 1,782 | $ 1,327 |  |  |  |
Mountain | Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 19.40% | 23.20% |  |  |  |
West North Central | Commercial Mortgage | Mortgage loans on real estate, at amortized cost |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 271 | $ 178 |  |  |  |
West North Central | Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 3.00% | 3.10% |  |  |  |
West South Central | Commercial Mortgage | Mortgage loans on real estate, at amortized cost |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 1,484 | $ 1,081 |  |  |  |
West South Central | Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 16.20% | 18.90% |  |  |  |
East North Central | Commercial Mortgage | Mortgage loans on real estate, at amortized cost |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 1,041 | $ 829 |  |  |  |
East North Central | Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 11.40% | 14.50% |  |  |  |
East South Central | Commercial Mortgage | Mortgage loans on real estate, at amortized cost |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 149 | $ 50 |  |  |  |
East South Central | Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 1.60% | 0.90% |  |  |  |
Middle Atlantic | Commercial Mortgage | Mortgage loans on real estate, at amortized cost |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 386 | $ 129 |  |  |  |
Middle Atlantic | Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 4.20% | 2.30% |  |  |  |
South Atlantic | Commercial Mortgage | Mortgage loans on real estate, at amortized cost |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 1,913 | $ 1,000 |  |  |  |
South Atlantic | Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 20.90% | 17.50% |  |  |  |
New England | Commercial Mortgage | Mortgage loans on real estate, at amortized cost |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 113 | $ 12 |  |  |  |
New England | Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 1.20% | 0.20% |  |  |  |
Other | Commercial Mortgage | Mortgage loans on real estate, at amortized cost |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Amortized cost | $ 230 | $ 200 |  |  |  |
Other | Commercial Mortgage | Mortgage loans on real estate, at amortized cost | Geographic Concentration Risk | Financing Receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage | 2.50% | 3.50% |  |  |  |

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