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Investments - Mortgage Loans by Region and Property Type (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, after Allowance for Credit Loss | $ 6,396 | $ 6,087 |  |
Commercial Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 6,440 | $ 6,138 |  |
Percent of Total | 100.00% | 100.00% |  |
Financing Receivable, Allowance for Credit Loss | $ 44 | $ 51 | $ 36 | $ 29
Financing Receivable, after Allowance for Credit Loss | 6,396 | 6,087 |  |
Commercial Loan [Member] | Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,737 | $ 2,363 |  |
Percent of Total | 42.50% | 38.50% |  |
Commercial Loan [Member] | Multifamily |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,161 | $ 2,200 |  |
Percent of Total | 33.50% | 35.90% |  |
Commercial Loan [Member] | Office |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 507 | $ 578 |  |
Percent of Total | 7.90% | 9.40% |  |
Commercial Loan [Member] | Retail |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 957 | $ 917 |  |
Percent of Total | 14.90% | 14.90% |  |
Commercial Loan [Member] | Residential Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 78 | $ 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 |  |
Commercial Loan [Member] | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 100.00% | 100.00% |  |
Commercial Loan [Member] | East North Central |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 362 | $ 368 |  |
Commercial Loan [Member] | East North Central | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 5.60% | 6.00% |  |
Commercial Loan [Member] | Middle Atlantic |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 259 | $ 238 |  |
Commercial Loan [Member] | Middle Atlantic | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 4.00% | 3.90% |  |
Commercial Loan [Member] | Mountain |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 764 | $ 699 |  |
Commercial Loan [Member] | Mountain | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 11.90% | 11.40% |  |
Commercial Loan [Member] | New England |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 356 | $ 351 |  |
Commercial Loan [Member] | New England | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 5.50% | 5.70% |  |
Commercial Loan [Member] | Pacific |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,400 | $ 1,326 |  |
Commercial Loan [Member] | Pacific | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 21.80% | 21.60% |  |
Commercial Loan [Member] | South Atlantic |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,821 | $ 1,776 |  |
Commercial Loan [Member] | South Atlantic | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 28.30% | 28.90% |  |
Commercial Loan [Member] | West North Central |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 97 | $ 103 |  |
Commercial Loan [Member] | West North Central | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 1.50% | 1.70% |  |
Commercial Loan [Member] | West South Central |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 588 | $ 445 |  |
Commercial Loan [Member] | West South Central | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 9.10% | 7.20% |  |
Commercial Loan [Member] | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 793 | $ 832 |  |
Commercial Loan [Member] | Other | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 12.30% | 13.60% |  |

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