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Investments - Commercial Mortgage Loans LTV & DSCR (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Schedule of Investments [Line Items] |  |  |  |
Number of loans held-for-sale | 0 | 0 |  |
Financing Receivable, Modifications, Number of Contracts | 0 | 0 |  |
LTV ratio | 51.00% |  |  |
LTV ratio at origination | 60.00% |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  | $ 4,215 |
Financing Receivable, Allowance for Credit Loss |  |  | 0 |
Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Financing Receivable, Individually Evaluated for Impairment | $ 0 |  |  |
Avg. Debt-Service Coverage Ratio | 2.48 | 2.52 |  |
Financing Receivable, before Allowance for Credit Loss | $ 5,412 | $ 4,531 |  |
Financing Receivable, Allowance for Credit Loss | $ 29 | $ 38 | $ 0 | $ 1
Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.61 | 1.59 |  |
Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.55 | 2.69 |  |
Amortized Cost [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | $ 1,488 | $ 687 |  |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 695 | 919 |  |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 813 | 622 |  |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 572 | 491 |  |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 462 | 286 |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,382 | 1,526 |  |
Financing Receivable, before Allowance for Credit Loss | 5,412 | 4,531 |  |
Amortized Cost [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 7 | 28 |  |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 50 | 243 |  |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 91 | 212 |  |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 100 | 45 |  |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 45 | 51 |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 97 | 115 |  |
Financing Receivable, before Allowance for Credit Loss | 390 | 694 |  |
Amortized Cost [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 1,481 | 659 |  |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 645 | 676 |  |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 722 | 410 |  |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 472 | 446 |  |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 417 | 235 |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,285 | 1,411 |  |
Financing Receivable, before Allowance for Credit Loss | $ 5,022 | $ 3,837 |  |
Originated in Current Fiscal Year [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.70 | 2.52 |  |
Originated in Current Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.37 | 1.62 |  |
Originated in Current Fiscal Year [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.70 | 2.56 |  |
Originated in Fiscal Year before Latest Fiscal Year [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.77 | 2.51 |  |
Originated in Fiscal Year before Latest Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.63 | 1.58 |  |
Originated in Fiscal Year before Latest Fiscal Year [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.78 | 2.85 |  |
Originated Two Years before Latest Fiscal Year [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.64 | 1.94 |  |
Originated Two Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.57 | 1.33 |  |
Originated Two Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.78 | 2.25 |  |
Originated Three Years before Latest Fiscal Year [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.02 | 1.90 |  |
Originated Three Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.00 | 2.02 |  |
Originated Three Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.23 | 1.89 |  |
Originated Four Years before Latest Fiscal Year [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.86 | 2.80 |  |
Originated Four Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.37 | 1.92 |  |
Originated Four Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.91 | 2.99 |  |
Originated Five or More Years before Latest Fiscal Year [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.41 | 2.92 |  |
Originated Five or More Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.80 | 1.74 |  |
Originated Five or More Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.45 | 3.01 |  |

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