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Investments - Investments - Mortgage Loans by Region and Property Type (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss | $ 5,931 |  | $ 5,383 |  |  |
Commercial Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 5,967 |  | $ 5,412 |  |  |
Percent of Total | 100.00% |  | 100.00% |  |  |
Financing Receivable, Allowance for Credit Loss | $ (36) | $ (36) | $ (29) | $ (26) | $ (24) | $ (38)
Financing Receivable, after Allowance for Credit Loss | 5,931 |  | 5,383 |  |  |
Commercial Loan [Member] | Industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,146 |  | $ 1,931 |  |  |
Percent of Total | 36.00% |  | 35.70% |  |  |
Commercial Loan [Member] | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 2,222 |  | $ 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 | $ 611 |  | $ 627 |  |  |
Percent of Total | 10.20% |  | 11.60% |  |  |
Commercial Loan [Member] | Retail |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 948 |  | $ 951 |  |  |
Percent of Total | 15.90% |  | 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] | 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 | $ 313 |  | $ 284 |  |  |
Commercial Loan [Member] | East North Central [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 5.20% |  | 5.20% |  |  |
Commercial Loan [Member] | Middle Atlantic [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 291 |  | $ 303 |  |  |
Commercial Loan [Member] | Middle Atlantic [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 4.90% |  | 5.60% |  |  |
Commercial Loan [Member] | Mountain [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 708 |  | $ 450 |  |  |
Commercial Loan [Member] | Mountain [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 11.90% |  | 8.30% |  |  |
Commercial Loan [Member] | New England [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 419 |  | $ 393 |  |  |
Commercial Loan [Member] | New England [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 7.00% |  | 7.30% |  |  |
Commercial Loan [Member] | Pacific [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,300 |  | $ 1,245 |  |  |
Commercial Loan [Member] | Pacific [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 21.80% |  | 23.00% |  |  |
Commercial Loan [Member] | South Atlantic [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,643 |  | $ 1,556 |  |  |
Commercial Loan [Member] | South Atlantic [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 27.50% |  | 28.80% |  |  |
Commercial Loan [Member] | West North Central [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 101 |  | $ 85 |  |  |
Commercial Loan [Member] | West North Central [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 1.70% |  | 1.60% |  |  |
Commercial Loan [Member] | West South Central [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 422 |  | $ 424 |  |  |
Commercial Loan [Member] | West South Central [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 7.10% |  | 7.80% |  |  |
Commercial Loan [Member] | Region Others [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 770 |  | $ 672 |  |  |
Commercial Loan [Member] | Region Others [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 12.90% |  | 12.40% |  |  |

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