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Investments - Investments - Mortgage Loans by Region and Property Type (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | $ 4,215 |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | 0 |  |  |
Commercial Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 4,499 |  | $ 4,215 |  |  |
Percent of Total | 100.00% |  | 100.00% |  |  |
Financing Receivable, Allowance for Credit Loss | $ 38 | $ 43 | $ 0 | $ 0 | $ 0 | $ 1
Commercial Loan [Member] | Industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,284 |  | $ 1,167 |  |  |
Percent of Total | 28.50% |  | 27.70% |  |  |
Commercial Loan [Member] | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,493 |  | $ 1,313 |  |  |
Percent of Total | 33.20% |  | 31.20% |  |  |
Commercial Loan [Member] | Office |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 755 |  | $ 723 |  |  |
Percent of Total | 16.80% |  | 17.20% |  |  |
Commercial Loan [Member] | Retail |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 793 |  | $ 735 |  |  |
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 | $ 134 |  | $ 137 |  |  |
Percent of Total | 3.00% |  | 3.20% |  |  |
Commercial Loan [Member] | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 40 |  | $ 140 |  |  |
Percent of Total | 0.90% |  | 3.30% |  |  |
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 | $ 284 |  | $ 270 |  |  |
Commercial Loan [Member] | East North Central [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 6.30% |  | 6.40% |  |  |
Commercial Loan [Member] | Middle Atlantic [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 292 |  | $ 319 |  |  |
Commercial Loan [Member] | Middle Atlantic [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 6.50% |  | 7.50% |  |  |
Commercial Loan [Member] | Mountain [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 201 |  | $ 109 |  |  |
Commercial Loan [Member] | Mountain [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 4.50% |  | 2.60% |  |  |
Commercial Loan [Member] | New England [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 397 |  | $ 344 |  |  |
Commercial Loan [Member] | New England [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 8.80% |  | 8.20% |  |  |
Commercial Loan [Member] | Pacific [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 989 |  | $ 906 |  |  |
Commercial Loan [Member] | Pacific [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 22.00% |  | 21.50% |  |  |
Commercial Loan [Member] | South Atlantic [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 989 |  | $ 944 |  |  |
Commercial Loan [Member] | South Atlantic [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 22.00% |  | 22.40% |  |  |
Commercial Loan [Member] | West North Central [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 44 |  | $ 46 |  |  |
Commercial Loan [Member] | West North Central [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 1.00% |  | 1.10% |  |  |
Commercial Loan [Member] | West South Central [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 473 |  | $ 439 |  |  |
Commercial Loan [Member] | West South Central [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 10.50% |  | 10.40% |  |  |
Commercial Loan [Member] | Region Others [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 830 |  | $ 838 |  |  |
Commercial Loan [Member] | Region Others [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 18.40% |  | 19.90% |  |  |

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