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Investments - Mortgage Loans by Region and Property Type (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  |  | $ 4,215
Financing Receivable, Allowance for Credit Loss |  |  |  | 0
Financing Receivable, after Allowance for Credit Loss | $ 6,000 | $ 5,383 |  | 4,215
Commercial Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 6,036 | $ 5,412 |  |
Percent of Total | 100.00% | 100.00% |  |
Financing Receivable, Allowance for Credit Loss | $ 36 | $ 29 | $ 38 | $ 0
Financing Receivable, after Allowance for Credit Loss | 6,000 | 5,383 |  |
Commercial Loan [Member] | Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,217 | $ 1,931 |  |
Percent of Total | 36.70% | 35.70% |  |
Commercial Loan [Member] | Multifamily |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,247 | $ 1,833 |  |
Percent of Total | 37.20% | 33.90% |  |
Commercial Loan [Member] | Office |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 585 | $ 627 |  |
Percent of Total | 9.70% | 11.60% |  |
Commercial Loan [Member] | Retail |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 947 | $ 951 |  |
Percent of Total | 15.70% | 17.60% |  |
Commercial Loan [Member] | Residential Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 0 | $ 30 |  |
Percent of Total | 0.00% | 0.50% |  |
Commercial Loan [Member] | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 40 | $ 40 |  |
Percent of Total | 0.70% | 0.70% |  |
Commercial Loan [Member] | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 100.00% | 100.00% |  |
Commercial Loan [Member] | Mortgage loans | Financial Asset, Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 0 | $ 0 |  |
Commercial Loan [Member] | East North Central |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 317 | $ 284 |  |
Commercial Loan [Member] | East North Central | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 5.30% | 5.20% |  |
Commercial Loan [Member] | Middle Atlantic |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 316 | $ 303 |  |
Commercial Loan [Member] | Middle Atlantic | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 5.20% | 5.60% |  |
Commercial Loan [Member] | Mountain |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 707 | $ 450 |  |
Commercial Loan [Member] | Mountain | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 11.70% | 8.30% |  |
Commercial Loan [Member] | New England |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 395 | $ 393 |  |
Commercial Loan [Member] | New England | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 6.50% | 7.30% |  |
Commercial Loan [Member] | Pacific |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,299 | $ 1,245 |  |
Commercial Loan [Member] | Pacific | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 21.50% | 23.00% |  |
Commercial Loan [Member] | South Atlantic |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,670 | $ 1,556 |  |
Commercial Loan [Member] | South Atlantic | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 27.70% | 28.80% |  |
Commercial Loan [Member] | West North Central |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 105 | $ 85 |  |
Commercial Loan [Member] | West North Central | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 1.70% | 1.60% |  |
Commercial Loan [Member] | West South Central |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 421 | $ 424 |  |
Commercial Loan [Member] | West South Central | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 7.00% | 7.80% |  |
Commercial Loan [Member] | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 806 | $ 672 |  |
Commercial Loan [Member] | Other | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 13.40% | 12.40% |  |

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