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Investments - Investments - Mortgage Loans by Region and Property Type (Details) - Commercial Loan [Member] - USD ($) $ in Millions | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 4,900 |  | $ 4,531 |  |  |
Percent of Total | 100.00% |  | 100.00% |  |  |
Financing Receivable, Allowance for Credit Loss | $ (24) | $ (34) | $ (38) | $ (43) | $ (21) | $ 0
Financing Receivable, after Allowance for Credit Loss | 4,876 |  | 4,493 |  |  |
Industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,622 |  | $ 1,339 |  |  |
Percent of Total | 33.10% |  | 29.50% |  |  |
Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,609 |  | $ 1,498 |  |  |
Percent of Total | 32.80% |  | 33.10% |  |  |
Office |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 652 |  | $ 774 |  |  |
Percent of Total | 13.30% |  | 17.10% |  |  |
Retail |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 901 |  | $ 788 |  |  |
Percent of Total | 18.40% |  | 17.40% |  |  |
Residential Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 76 |  | $ 92 |  |  |
Percent of Total | 1.60% |  | 2.00% |  |  |
Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 40 |  | $ 40 |  |  |
Percent of Total | 0.80% |  | 0.90% |  |  |
Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 100.00% |  | 100.00% |  |  |
East North Central [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 293 |  | $ 290 |  |  |
East North Central [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 6.00% |  | 6.40% |  |  |
Middle Atlantic [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 289 |  | $ 291 |  |  |
Middle Atlantic [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 5.90% |  | 6.40% |  |  |
Mountain [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 345 |  | $ 254 |  |  |
Mountain [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 7.00% |  | 5.60% |  |  |
New England [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 395 |  | $ 397 |  |  |
New England [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 8.10% |  | 8.80% |  |  |
Pacific [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,196 |  | $ 1,001 |  |  |
Pacific [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 24.40% |  | 22.10% |  |  |
South Atlantic [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,246 |  | $ 1,038 |  |  |
South Atlantic [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 25.40% |  | 22.90% |  |  |
West North Central [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 44 |  | $ 44 |  |  |
West North Central [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 0.90% |  | 1.00% |  |  |
West South Central [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 373 |  | $ 433 |  |  |
West South Central [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 7.60% |  | 9.50% |  |  |
Region Others [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 719 |  | $ 783 |  |  |
Region Others [Member] | Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of Total | 14.70% |  | 17.30% |  |  |

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