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Investments - Commercial Mortgage Loans LTV & DSCR (Details) $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 4,215 |  |
Financing Receivable, Allowance for Credit Loss |  | $ 0 |  |
Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.52 | 2.46 |  |
Financing Receivable, before Allowance for Credit Loss | $ 4,531 | $ 4,215 |  |
Financing Receivable, Allowance for Credit Loss | $ 38 | $ 0 | $ 1 | $ 1
Commercial Loan [Member] | Originated in Current Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.52 |  |  |
Commercial Loan [Member] | Originated in Fiscal Year before Latest Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.51 |  |  |
Commercial Loan [Member] | Originated Two Years before Latest Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.94 |  |  |
Commercial Loan [Member] | Originated Three Years before Latest Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.90 |  |  |
Commercial Loan [Member] | Originated Four Years before Latest Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.80 |  |  |
Commercial Loan [Member] | Originated Five or More Years before Latest Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.92 |  |  |
Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.59 | 1.53 |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 376 |  |
Commercial Loan [Member] | 65% - 80% | Originated in Current Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.62 |  |  |
Commercial Loan [Member] | 65% - 80% | Originated in Fiscal Year before Latest Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.58 |  |  |
Commercial Loan [Member] | 65% - 80% | Originated Two Years before Latest Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.33 |  |  |
Commercial Loan [Member] | 65% - 80% | Originated Three Years before Latest Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.02 |  |  |
Commercial Loan [Member] | 65% - 80% | Originated Four Years before Latest Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.92 |  |  |
Commercial Loan [Member] | 65% - 80% | Originated Five or More Years before Latest Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.74 |  |  |
Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.69 | 2.56 |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 3,839 |  |
Commercial Loan [Member] | Less than 65% | Originated in Current Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.56 |  |  |
Commercial Loan [Member] | Less than 65% | Originated in Fiscal Year before Latest Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.85 |  |  |
Commercial Loan [Member] | Less than 65% | Originated Two Years before Latest Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.25 |  |  |
Commercial Loan [Member] | Less than 65% | Originated Three Years before Latest Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.89 |  |  |
Commercial Loan [Member] | Less than 65% | Originated Four Years before Latest Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.99 |  |  |
Commercial Loan [Member] | Less than 65% | Originated Five or More Years before Latest Fiscal Year [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 3.01 |  |  |
Commercial Loan [Member] | Amortized Cost [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | $ 687 |  |  |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 919 |  |  |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 622 |  |  |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 491 |  |  |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 286 |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,526 |  |  |
Financing Receivable, before Allowance for Credit Loss | 4,531 |  |  |
Commercial Loan [Member] | Amortized Cost [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 28 |  |  |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 243 |  |  |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 212 |  |  |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 45 |  |  |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 51 |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 115 |  |  |
Financing Receivable, before Allowance for Credit Loss | 694 |  |  |
Commercial Loan [Member] | Amortized Cost [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 659 |  |  |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 676 |  |  |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 410 |  |  |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 446 |  |  |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 235 |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,411 |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 3,837 |  |  |

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