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Investments - Commercial Mortgage Loans LTV & DSCR (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Schedule of Investments [Line Items] |  |  |  |
Number of loans held-for-sale | 0 | 0 |  |
Financing Receivable, Modifications, Number of Contracts | 0 | 0 |  |
LTV ratio | 52.00% |  |  |
LTV ratio at origination | 59.00% |  |  |
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 | 2.59 | 2.48 |  |
Financing Receivable, before Allowance for Credit Loss | $ 6,036 | $ 5,412 |  |
Financing Receivable, Allowance for Credit Loss | $ 36 | $ 29 | $ 38 | $ 0
Commercial Loan [Member] | LTV Greater Than 80 Percent |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.40 |  |  |
Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.91 | 1.61 |  |
Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.65 | 2.55 |  |
Amortized Cost [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | $ 855 | $ 1,488 |  |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,534 | 695 |  |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 706 | 813 |  |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 780 | 572 |  |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 545 | 462 |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,616 | 1,382 |  |
Financing Receivable, before Allowance for Credit Loss | 6,036 | 5,412 |  |
Amortized Cost [Member] | Commercial Loan [Member] | LTV Greater Than 80 Percent |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 0 |  |  |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 0 |  |  |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 0 |  |  |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 0 |  |  |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 0 |  |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 23 |  |  |
Financing Receivable, before Allowance for Credit Loss | 23 |  |  |
Amortized Cost [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 16 | 7 |  |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 59 | 50 |  |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 43 | 91 |  |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 100 | 100 |  |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 108 | 45 |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 117 | 97 |  |
Financing Receivable, before Allowance for Credit Loss | 443 | 390 |  |
Amortized Cost [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Financing Receivable, Year One, Originated, Current Fiscal Year | 839 | 1,481 |  |
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year | 1,475 | 645 |  |
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year | 663 | 722 |  |
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year | 680 | 472 |  |
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year | 437 | 417 |  |
Financing Receivable, Originated, More than Five Years before Current Fiscal Year | 1,476 | 1,285 |  |
Financing Receivable, before Allowance for Credit Loss | $ 5,570 | $ 5,022 |  |
Originated in Current Fiscal Year [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.42 | 2.70 |  |
Originated in Current Fiscal Year [Member] | Commercial Loan [Member] | LTV Greater Than 80 Percent |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 0 |  |  |
Originated in Current Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.02 | 2.37 |  |
Originated in Current Fiscal Year [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.43 | 2.70 |  |
Originated in Fiscal Year before Latest Fiscal Year [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.78 | 2.77 |  |
Originated in Fiscal Year before Latest Fiscal Year [Member] | Commercial Loan [Member] | LTV Greater Than 80 Percent |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 0 |  |  |
Originated in Fiscal Year before Latest Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.61 | 2.63 |  |
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 | 2.79 | 2.78 |  |
Originated Two Years before Latest Fiscal Year [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 3.01 | 2.64 |  |
Originated Two Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | LTV Greater Than 80 Percent |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 0 |  |  |
Originated Two Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.78 | 1.57 |  |
Originated Two Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 3.02 | 2.78 |  |
Originated Three Years before Latest Fiscal Year [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.66 | 2.02 |  |
Originated Three Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | LTV Greater Than 80 Percent |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 0 |  |  |
Originated Three Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.95 | 1.00 |  |
Originated Three Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.77 | 2.23 |  |
Originated Four Years before Latest Fiscal Year [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.99 | 1.86 |  |
Originated Four Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | LTV Greater Than 80 Percent |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 0 |  |  |
Originated Four Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | 65% - 80% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.11 | 1.37 |  |
Originated Four Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | Less than 65% |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.21 | 1.91 |  |
Originated Five or More Years before Latest Fiscal Year [Member] | Commercial Loan [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 2.48 | 2.41 |  |
Originated Five or More Years before Latest Fiscal Year [Member] | Commercial Loan [Member] | LTV Greater Than 80 Percent |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Avg. Debt-Service Coverage Ratio | 1.40 |  |  |
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 | 1.91 | 1.80 |  |
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 | 2.54 | 2.45 |  |

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