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Market Risk Benefits - Significant Inputs and Assumptions (Details) $ in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Market Risk Benefit [Line Items] |  |  |  |  |  |
Market risk benefits | $ 335 | $ (830) | $ (629) | $ 360 | $ 1,133 | $ 1,103
Utilization of guaranteed withdrawals |  |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |  |
Increase (decrease) in net income from change in assumptions | (18) |  |  |  |  |
Surrender rate |  |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |  |
Increase (decrease) in net income from change in assumptions | $ (110) |  |  |  |  |
Discounted cash flow | Nonperformance risk |  |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |  |
Market risk benefits, measurement input | 0.0085 | 0.0075 |  |  |  |
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 | 0.003 |  |  |  |
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 | 0.750 |  |  |  |
Maximum | Discounted cash flow | Market volatility |  |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |  |
Market risk benefits, measurement input | 0.252 | 0.250 |  |  |  |
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 | 0.116 |  |  |  |
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 | 0.103 |  |  |  |
Weighted average | Discounted cash flow | Nonperformance risk |  |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |  |
Market risk benefits, measurement input | 0.0085 | 0.0075 |  |  |  |
Weighted average | Discounted cash flow | Mortality rate |  |  |  |  |  |
Market Risk Benefit [Line Items] |  |  |  |  |  |
Market risk benefits, measurement input | 0.016 | 0.016 |  |  |  |

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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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