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Investments - Investments - Mortgage Loans by Region and Property Type (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, after Allowance for Credit Loss |  | $ 4,493 |  |
Commercial Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 4,622 | $ 4,531 |  |
Percent of Total | 100.00% | 100.00% |  |
Financing Receivable, Allowance for Credit Loss | $ (34) | $ (38) | $ (21) | $ 0
Financing Receivable, after Allowance for Credit Loss | 4,588 | 4,493 |  |
Commercial Loan [Member] | Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,472 | $ 1,339 |  |
Percent of Total | 31.80% | 29.50% |  |
Commercial Loan [Member] | Multifamily |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,499 | $ 1,498 |  |
Percent of Total | 32.40% | 33.10% |  |
Commercial Loan [Member] | Office |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 712 | $ 774 |  |
Percent of Total | 15.40% | 17.10% |  |
Commercial Loan [Member] | Retail |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 807 | $ 788 |  |
Percent of Total | 17.50% | 17.40% |  |
Commercial Loan [Member] | Residential Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 92 | $ 92 |  |
Percent of Total | 2.00% | 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 | 0.90% | 0.90% |  |
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 | $ 279 | $ 290 |  |
Commercial Loan [Member] | East North Central [Member] | Mortgages [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 6.00% | 6.40% |  |
Commercial Loan [Member] | Middle Atlantic [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 290 | $ 291 |  |
Commercial Loan [Member] | Middle Atlantic [Member] | Mortgages [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 6.30% | 6.40% |  |
Commercial Loan [Member] | Mountain [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 295 | $ 254 |  |
Commercial Loan [Member] | Mountain [Member] | Mortgages [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 6.40% | 5.60% |  |
Commercial Loan [Member] | New England [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 396 | $ 397 |  |
Commercial Loan [Member] | New England [Member] | Mortgages [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 8.60% | 8.80% |  |
Commercial Loan [Member] | Pacific [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,044 | $ 1,001 |  |
Commercial Loan [Member] | Pacific [Member] | Mortgages [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 22.60% | 22.10% |  |
Commercial Loan [Member] | South Atlantic [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,062 | $ 1,038 |  |
Commercial Loan [Member] | South Atlantic [Member] | Mortgages [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 23.00% | 22.90% |  |
Commercial Loan [Member] | West North Central [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 44 | $ 44 |  |
Commercial Loan [Member] | West North Central [Member] | Mortgages [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 0.90% | 1.00% |  |
Commercial Loan [Member] | West South Central [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 431 | $ 433 |  |
Commercial Loan [Member] | West South Central [Member] | Mortgages [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 9.30% | 9.50% |  |
Commercial Loan [Member] | Region Others [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 781 | $ 783 |  |
Commercial Loan [Member] | Region Others [Member] | Mortgages [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of Total | 16.90% | 17.30% |  |

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