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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

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
-Topic 820
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