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Investments - Investments - Mortgage Loans by Region and Property Type (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, after Allowance for Credit Loss | $ 6,356 | $ 6,396 |  |
Commercial Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 6,399 | $ 6,440 |  |
Percent of Total | 100.00% | 100.00% |  |
Financing Receivable, Allowance for Credit Loss | $ (43) | $ (44) | $ (48) | $ (51)
Financing Receivable, after Allowance for Credit Loss | 6,356 | 6,396 |  |
Commercial Loan [Member] | Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,724 | $ 2,737 |  |
Percent of Total | 42.60% | 42.50% |  |
Commercial Loan [Member] | Multifamily |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,141 | $ 2,161 |  |
Percent of Total | 33.40% | 33.50% |  |
Commercial Loan [Member] | Office |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 503 | $ 507 |  |
Percent of Total | 7.90% | 7.90% |  |
Commercial Loan [Member] | Retail |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 953 | $ 957 |  |
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 | $ 78 |  |
Percent of Total | 1.20% | 1.20% |  |
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 | $ 364 | $ 362 |  |
Percent of Total | 5.70% | 5.60% |  |
Middle Atlantic [Member] | Commercial Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 259 | $ 259 |  |
Percent of Total | 4.10% | 4.00% |  |
Mountain [Member] | Commercial Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 770 | $ 764 |  |
Percent of Total | 12.00% | 11.90% |  |
New England [Member] | Commercial Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 381 | $ 356 |  |
Percent of Total | 6.00% | 5.50% |  |
Pacific [Member] | Commercial Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,403 | $ 1,400 |  |
Percent of Total | 21.90% | 21.80% |  |
South Atlantic [Member] | Commercial Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,775 | $ 1,821 |  |
Percent of Total | 27.70% | 28.30% |  |
West North Central [Member] | Commercial Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 97 | $ 97 |  |
Percent of Total | 1.50% | 1.50% |  |
West South Central [Member] | Commercial Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 662 | $ 588 |  |
Percent of Total | 10.30% | 9.10% |  |
Region Others [Member] | Commercial Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 688 | $ 793 |  |
Percent of Total | 10.80% | 12.30% |  |

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