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Investments - Investments - Mortgage Loans by Region and Property Type (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss | $ 6,016 |  | $ 6,000 |  |  |
Commercial Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 6,062 |  | $ 6,036 |  |  |
Percent of Total | 100.00% |  | 100.00% |  |  |
Financing Receivable, Allowance for Credit Loss | $ (46) | $ (41) | $ (36) | $ (36) | $ (36) | $ (29)
Financing Receivable, after Allowance for Credit Loss | 6,016 |  | 6,000 |  |  |
Commercial Loan [Member] | Industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,351 |  | $ 2,217 |  |  |
Percent of Total | 38.80% |  | 36.70% |  |  |
Commercial Loan [Member] | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,191 |  | $ 2,247 |  |  |
Percent of Total | 36.10% |  | 37.20% |  |  |
Commercial Loan [Member] | Office |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 581 |  | $ 585 |  |  |
Percent of Total | 9.60% |  | 9.70% |  |  |
Commercial Loan [Member] | Retail |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 939 |  | $ 947 |  |  |
Percent of Total | 15.50% |  | 15.70% |  |  |
Commercial Loan [Member] | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 0 |  | $ 40 |  |  |
Percent of Total | 0.00% |  | 0.70% |  |  |
Commercial Loan [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 100.00% |  | 100.00% |  |  |
Commercial Loan [Member] | East North Central [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 345 |  | $ 317 |  |  |
Commercial Loan [Member] | East North Central [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 5.70% |  | 5.30% |  |  |
Commercial Loan [Member] | Middle Atlantic [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 231 |  | $ 316 |  |  |
Commercial Loan [Member] | Middle Atlantic [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 3.80% |  | 5.20% |  |  |
Commercial Loan [Member] | Mountain [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 723 |  | $ 707 |  |  |
Commercial Loan [Member] | Mountain [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 11.90% |  | 11.70% |  |  |
Commercial Loan [Member] | New England [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 352 |  | $ 395 |  |  |
Commercial Loan [Member] | New England [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 5.80% |  | 6.50% |  |  |
Commercial Loan [Member] | Pacific [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,330 |  | $ 1,299 |  |  |
Commercial Loan [Member] | Pacific [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 21.90% |  | 21.50% |  |  |
Commercial Loan [Member] | South Atlantic [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,769 |  | $ 1,670 |  |  |
Commercial Loan [Member] | South Atlantic [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 29.20% |  | 27.70% |  |  |
Commercial Loan [Member] | West North Central [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 119 |  | $ 105 |  |  |
Commercial Loan [Member] | West North Central [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 2.00% |  | 1.70% |  |  |
Commercial Loan [Member] | West South Central [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 434 |  | $ 421 |  |  |
Commercial Loan [Member] | West South Central [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 7.20% |  | 7.00% |  |  |
Commercial Loan [Member] | Region Others [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 759 |  | $ 806 |  |  |
Commercial Loan [Member] | Region Others [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 12.50% |  | 13.40% |  |  |

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