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Market Risk Benefits (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
Market Risk Benefit [Line Items] |  |  |  |  |  |
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk | $ 216 | $ 259 |  |  |  |
Market Risk Benefit, Net Amount at Risk | 224 |  | $ 247 |  |  |
Accounting Standards Update 2018-12 |  |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |  |
Market Risk Benefit, Net Amount at Risk |  |  | 247 | $ 262 |  |
Insurance, Other | Americas [Member] | Other Segments |  |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |  |
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change | 216 | 259 | 247 | 262 |  |
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change | 225 | 283 | 263 | 254 |  |
Market Risk Benefit, Interest Expense | 9 | 21 |  |  |  |
Market Risk Benefit, Attributed Fee Collected | 19 | 7 |  |  |  |
Market Risk Benefit, Benefit Payment | 1 | 1 |  |  |  |
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption | 16 | 19 |  |  |  |
Market Risk Benefit, Increase (Decrease) from Interest Rate Change | (54) | (40) |  |  |  |
Market Risk Benefit, Increase (Decrease) from Equity Market Change | (25) | 17 |  |  |  |
Market Risk Benefit, Increase (Decrease) from Volatility | (5) | 4 |  |  |  |
Market Risk Benefit, Increase (Decrease) from Other Assumption | (11) | 1 |  |  |  |
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected | 12 | (1) |  |  |  |
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax | (9) | (24) |  |  |  |
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk | 216 | 259 |  |  |  |
Market Risk Benefit, Reinsurance Recoverable, after Allowance | 0 | 0 |  |  |  |
Market Risk Benefit, Net Amount at Risk | $ 1,375 | $ 1,540 |  |  |  |
Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age | 71 years | 66 years |  |  |  |
Insurance, Other | Americas [Member] | Accounting Standards Update 2018-12 | Other Segments |  |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |  |
Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  | 247 | 262 | $ 266 | $ 266
Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change |  |  | 263 | 254 | 266 | $ 311
Market Risk Benefit, Interest Expense |  |  | 54 | 3 |  |
Market Risk Benefit, Attributed Fee Collected |  |  | 28 | 12 |  |
Market Risk Benefit, Benefit Payment |  |  | (9) | (14) |  |
Market Risk Benefit, Increase (Decrease) from Future Expected Policyholder Behavior Assumption |  |  | 18 | 25 |  |
Market Risk Benefit, Increase (Decrease) from Interest Rate Change |  |  | (175) | (51) |  |
Market Risk Benefit, Increase (Decrease) from Equity Market Change |  |  | 48 | (49) |  |
Market Risk Benefit, Increase (Decrease) from Volatility |  |  | 19 | (2) |  |
Market Risk Benefit, Increase (Decrease) from Other Assumption |  |  | 7 | 5 |  |
Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected |  |  | 19 | 14 |  |
AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax |  |  | (16) | 8 |  |
Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk |  |  | 247 | 262 |  |
Market Risk Benefit, Reinsurance Recoverable, after Allowance |  |  | $ 0 | $ 0 | $ 0 |

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) (AOCI) from (increase) decrease in instrument-specific credit risk on contract or contract feature in long-duration contract issued by insurance entity protecting contract holder from other-than-nominal capital market risk and exposing insurance entity to other-than-nominal capital market risk. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 29G -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29G Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480016/944-40-65-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7B Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 55 -Paragraph 13K -Subparagraph (k) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-13K + Details
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- Definition Amount, before effect of reinsurance and after accumulated increase (decrease) in instrument-specific credit risk, of contract or contract feature in long-duration contract issued by insurance entity that both protects contract holder from other-than-nominal capital market risk and exposes insurance entity to other-than-nominal capital market risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 65 -Paragraph 2 -Subparagraph (h)(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 29G -Publisher FASB -URI https://asc.fasb.org//1943274/2147480046/944-40-55-29G Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 7B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-7B Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480112/944-40-45-3 + Details
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