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Investments - Investments - Mortgage Loans by Region and Property Type (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss | $ 6,415 |  | $ 6,087 |  |  |
Commercial Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 6,459 |  | $ 6,138 |  |  |
Percent of Total | 100.00% |  | 100.00% |  |  |
Financing Receivable, Allowance for Credit Loss | $ (44) | $ (48) | $ (51) | $ (46) | $ (41) | $ (36)
Financing Receivable, after Allowance for Credit Loss | 6,415 |  | 6,087 |  |  |
Commercial Loan [Member] | Industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,712 |  | $ 2,363 |  |  |
Percent of Total | 42.00% |  | 38.50% |  |  |
Commercial Loan [Member] | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,188 |  | $ 2,200 |  |  |
Percent of Total | 33.90% |  | 35.90% |  |  |
Commercial Loan [Member] | Office |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 546 |  | $ 578 |  |  |
Percent of Total | 8.40% |  | 9.40% |  |  |
Commercial Loan [Member] | Retail |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 934 |  | $ 917 |  |  |
Percent of Total | 14.50% |  | 14.90% |  |  |
Commercial Loan [Member] | Residential Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 79 |  | $ 80 |  |  |
Percent of Total | 1.20% |  | 1.30% |  |  |
Commercial Loan [Member] | Regional Shopping Malls |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 0 |  | $ 0 |  |  |
East North Central [Member] | Commercial Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 378 |  | $ 368 |  |  |
Percent of Total | 5.80% |  | 6.00% |  |  |
Middle Atlantic [Member] | Commercial Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 256 |  | $ 238 |  |  |
Percent of Total | 4.00% |  | 3.90% |  |  |
Mountain [Member] | Commercial Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 740 |  | $ 699 |  |  |
Percent of Total | 11.50% |  | 11.40% |  |  |
New England [Member] | Commercial Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 358 |  | $ 351 |  |  |
Percent of Total | 5.50% |  | 5.70% |  |  |
Pacific [Member] | Commercial Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,375 |  | $ 1,326 |  |  |
Percent of Total | 21.30% |  | 21.60% |  |  |
South Atlantic [Member] | Commercial Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,810 |  | $ 1,776 |  |  |
Percent of Total | 28.00% |  | 28.90% |  |  |
West North Central [Member] | Commercial Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 96 |  | $ 103 |  |  |
Percent of Total | 1.50% |  | 1.70% |  |  |
West South Central [Member] | Commercial Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 602 |  | $ 445 |  |  |
Percent of Total | 9.30% |  | 7.20% |  |  |
Region Others [Member] | Commercial Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 844 |  | $ 832 |  |  |
Percent of Total | 13.10% |  | 13.60% |  |  |

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