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Market Risk Benefits - Significant Inputs and Assumptions (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Market Risk Benefit [Line Items]
Market risk benefits	$ (919)	$ (114)	$ (629)	$ 335
Utilization of guaranteed withdrawals
Market Risk Benefit [Line Items]
Increase (decrease) in net income from change in assumptions	(15)
Surrender rate
Market Risk Benefit [Line Items]
Increase (decrease) in net income from change in assumptions	$ (83)
Discounted cash flow | Nonperformance risk
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.0065	0.0070
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	0.004	0.004
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	0.528	0.528
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	0.246	0.258
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	0.119	0.119
Weighted average | Discounted cash flow | Surrender rate
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.033	0.033
Weighted average | Discounted cash flow | Market volatility
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.103	0.108
Weighted average | Discounted cash flow | Nonperformance risk
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.0065	0.0070
Weighted average | Discounted cash flow | Mortality rate
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.017	0.017

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- Definition

Market Risk Benefit, Increase (Decrease) in Net Income From Assumption

+ References

No definition available.

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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
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Value of measurement input used to measure 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/2009/role/commonPracticeRef
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