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Investments - Investments - Mortgage Loans- Valuation Allowance Activity (Details) | Mar. 31, 2020 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 4,215,000,000 | $ 4,215,000,000 |  |
Financing Receivable, Allowance for Credit Loss |  | $ 19,000,000 | $ 0 |  |
Number of loans held-for-sale | 0 |  | 0 |  |
Number of loans with extensions or restructuring | 0 |  |  |  |
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan | 52.00% |  |  |  |
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan | 61.00% |  |  |  |
Commercial Loan [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Individually Evaluated for Impairment | $ 0 |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 4,374,000,000 |  | $ 4,215,000,000 |  |
Financing Receivable, Allowance for Credit Loss | 21,000,000 |  | 0 | $ 1,000,000 | $ 1,000,000
Commercial Loan [Member] | Mortgage loans (net of ACL of $21 and $0) |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Past-due mortgages |  |  | 0 |  |
Commercial Loan [Member] | Amortized Cost [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 4,374,000,000 |  | $ 4,200,000,000 |  |

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