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Market Risk Benefits - Significant Inputs and Assumptions (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Market Risk Benefit [Line Items] |  |  |  |
Market risk benefits | $ 335 | $ 1,103 | $ 2,901 | $ 4,829
Utilization of guaranteed withdrawals |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Increase (decrease) in net income from change in assumptions | (18) | (39) |  |
Surrender rate |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Increase (decrease) in net income from change in assumptions | $ (110) | (200) |  |
Mortality rate |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Increase (decrease) in net income from change in assumptions |  | $ (49) |  |
Discounted cash flow | Nonperformance risk |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Market risk benefits, measurement input | 0.0085 | 0.0095 |  |
Minimum | Discounted cash flow | Utilization of guaranteed withdrawals |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Market risk benefits, measurement input | 0.000 | 0.000 |  |
Minimum | Discounted cash flow | Surrender rate |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Market risk benefits, measurement input | 0.003 | 0.002 |  |
Minimum | Discounted cash flow | Market volatility |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Market risk benefits, measurement input | 0.000 | 0.000 |  |
Minimum | Discounted cash flow | Mortality rate |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Market risk benefits, measurement input | 0.000 | 0.000 |  |
Maximum | Discounted cash flow | Utilization of guaranteed withdrawals |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Market risk benefits, measurement input | 0.480 | 0.480 |  |
Maximum | Discounted cash flow | Surrender rate |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Market risk benefits, measurement input | 0.750 | 0.456 |  |
Maximum | Discounted cash flow | Market volatility |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Market risk benefits, measurement input | 0.252 | 0.266 |  |
Maximum | Discounted cash flow | Mortality rate |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Market risk benefits, measurement input | 0.416 | 0.416 |  |
Weighted average | Discounted cash flow | Utilization of guaranteed withdrawals |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Market risk benefits, measurement input | 0.116 | 0.110 |  |
Weighted average | Discounted cash flow | Surrender rate |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Market risk benefits, measurement input | 0.037 | 0.036 |  |
Weighted average | Discounted cash flow | Market volatility |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Market risk benefits, measurement input | 0.106 | 0.121 |  |
Weighted average | Discounted cash flow | Nonperformance risk |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Market risk benefits, measurement input | 0.0085 | 0.0095 |  |
Weighted average | Discounted cash flow | Mortality rate |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |
Market risk benefits, measurement input | 0.016 | 0.015 |  |

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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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