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Investments - Mortgage Loans by Region and Property Type (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
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 |  |  | 4,215 |
Commercial Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 5,412 | $ 4,531 |  |
Percent of Total | 100.00% | 100.00% |  |
Financing Receivable, Allowance for Credit Loss | $ 29 | $ 38 | $ 0 | $ 1
Financing Receivable, after Allowance for Credit Loss | 5,383 | 4,493 |  |
Commercial Loan [Member] | Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,931 | $ 1,339 |  |
Percent of Total | 35.70% | 29.50% |  |
Commercial Loan [Member] | Multifamily |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,833 | $ 1,498 |  |
Percent of Total | 33.90% | 33.10% |  |
Commercial Loan [Member] | Office |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 627 | $ 774 |  |
Percent of Total | 11.60% | 17.10% |  |
Commercial Loan [Member] | Retail |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 951 | $ 788 |  |
Percent of Total | 17.60% | 17.40% |  |
Commercial Loan [Member] | Residential Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 30 | $ 92 |  |
Percent of Total | 0.50% | 2.00% |  |
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% | 0.90% |  |
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 | $ 284 | $ 290 |  |
Commercial Loan [Member] | East North Central | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 5.20% | 6.40% |  |
Commercial Loan [Member] | Middle Atlantic |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 303 | $ 291 |  |
Commercial Loan [Member] | Middle Atlantic | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 5.60% | 6.40% |  |
Commercial Loan [Member] | Mountain |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 450 | $ 254 |  |
Commercial Loan [Member] | Mountain | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 8.30% | 5.60% |  |
Commercial Loan [Member] | New England |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 393 | $ 397 |  |
Commercial Loan [Member] | New England | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 7.30% | 8.80% |  |
Commercial Loan [Member] | Pacific |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,245 | $ 1,001 |  |
Commercial Loan [Member] | Pacific | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 23.00% | 22.10% |  |
Commercial Loan [Member] | South Atlantic |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,556 | $ 1,038 |  |
Commercial Loan [Member] | South Atlantic | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 28.80% | 22.90% |  |
Commercial Loan [Member] | West North Central |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 85 | $ 44 |  |
Commercial Loan [Member] | West North Central | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 1.60% | 1.00% |  |
Commercial Loan [Member] | West South Central |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 424 | $ 433 |  |
Commercial Loan [Member] | West South Central | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 7.80% | 9.50% |  |
Commercial Loan [Member] | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 672 | $ 783 |  |
Commercial Loan [Member] | Other | Mortgage loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 12.40% | 17.30% |  |

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