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Long-duration Contracts - Schedule of Unobservable Inputs for Market Risk Benefits (Details) $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Market Risk Benefit [Line Items]
Market risk benefits, net	$ 3,373	$ 2,489	$ 4,447
Minimum \| Discounted cash flow \| Nonperformance risk
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.004	0.002
Minimum \| Discounted cash flow \| Option budget
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.005	0.005
Minimum \| Discounted cash flow \| Surrender rate
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.032	0.033
Minimum \| Discounted cash flow \| Utilization rate
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.286	0.286
Maximum \| Discounted cash flow \| Nonperformance risk
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.014	0.016
Maximum \| Discounted cash flow \| Option budget
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.060	0.053
Maximum \| Discounted cash flow \| Surrender rate
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.064	0.067
Maximum \| Discounted cash flow \| Utilization rate
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.950	0.950
Weighted average \| Discounted cash flow \| Nonperformance risk
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.012	0.014
Weighted average \| Discounted cash flow \| Option budget
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.019	0.017
Weighted average \| Discounted cash flow \| Surrender rate
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.045	0.044
Weighted average \| Discounted cash flow \| Utilization rate
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.836	0.823