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General - Schedule of Impact of Adoption for Reserve for Future Policy Benefits (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
Present value of expected future policy benefits |  |  |  |  |
Balance | $ 2,918 | $ 2,753 | $ 2,714 | $ 3,469 | $ 1,501
Total adjustments |  | 51 |  | (44) |
Less: reinsurance recoverables |  |  |  |  | 162
Net reserve for future policy benefits, after reinsurance recoverables |  |  |  |  | 1,339
As reported |  |  |  |  |
Present value of expected future policy benefits |  |  |  |  |
Balance |  |  |  |  | 1,039
Effect of the remeasurement of the reserve at upper-medium grade fixed income-based rate |  |  |  |  |
Present value of expected future policy benefits |  |  |  |  |
Total adjustments |  |  |  |  | 385
Adjustments for contracts with net premiums in excess of gross premiums |  |  |  |  |
Present value of expected future policy benefits |  |  |  |  |
Total adjustments |  |  |  |  | 77
Revision of Prior Period, Adjustment |  |  |  |  |
Present value of expected future policy benefits |  |  |  |  |
Total adjustments |  |  |  |  | 462
Accident and health |  |  |  |  |
Present value of expected future policy benefits |  |  |  |  |
Balance | 2,333 | 2,229 | 2,218 | 2,796 | 1,037
Total adjustments |  | 21 |  | (44) |
Less: reinsurance recoverables |  |  |  |  | 159
Net reserve for future policy benefits, after reinsurance recoverables |  |  |  |  | 878
Accident and health | As reported |  |  |  |  |
Present value of expected future policy benefits |  |  |  |  |
Balance |  |  |  |  | 728
Accident and health | Effect of the remeasurement of the reserve at upper-medium grade fixed income-based rate |  |  |  |  |
Present value of expected future policy benefits |  |  |  |  |
Total adjustments |  |  |  |  | 232
Less: reinsurance recoverables |  |  |  |  | 33
Accident and health | Adjustments for contracts with net premiums in excess of gross premiums |  |  |  |  |
Present value of expected future policy benefits |  |  |  |  |
Total adjustments |  |  |  |  | 77
Less: reinsurance recoverables |  |  |  |  | 51
Accident and health | Revision of Prior Period, Adjustment |  |  |  |  |
Present value of expected future policy benefits |  |  |  |  |
Total adjustments |  |  |  |  | 309
Traditional life |  |  |  |  |
Present value of expected future policy benefits |  |  |  |  |
Balance | $ 585 | 524 | $ 496 | 673 | 464
Total adjustments |  | $ 30 |  | $ 0 |
Less: reinsurance recoverables |  |  |  |  | 3
Net reserve for future policy benefits, after reinsurance recoverables |  |  |  |  | 461
Traditional life | As reported |  |  |  |  |
Present value of expected future policy benefits |  |  |  |  |
Balance |  |  |  |  | 311
Traditional life | Effect of the remeasurement of the reserve at upper-medium grade fixed income-based rate |  |  |  |  |
Present value of expected future policy benefits |  |  |  |  |
Total adjustments |  |  |  |  | 153
Traditional life | Adjustments for contracts with net premiums in excess of gross premiums |  |  |  |  |
Present value of expected future policy benefits |  |  |  |  |
Total adjustments |  |  |  |  | 0
Traditional life | Revision of Prior Period, Adjustment |  |  |  |  |
Present value of expected future policy benefits |  |  |  |  |
Total adjustments |  |  |  |  | 153
Traditional Life Insurance Reclassified from Contractholder Funds |  |  |  |  |
Present value of expected future policy benefits |  |  |  |  |
Balance |  |  |  |  | $ 11

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- Definition Amount, before effect of reinsurance and after current period update of cash flow assumption and discount rate change, of expected future policy benefit and expense component of liability for future policy benefit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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- Definition Amount of cumulative increase (decrease) in expected future policy benefit and expense component for liability of future policy benefit from cash flow assumption change for future cash flows. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (g)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13I -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13I Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-6 + Details
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