Long-duration Contracts - Schedule of Unobservable Inputs for Market Risk Benefits (Details) $ in Millions	Jun. 30, 2026 USD ($)	Dec. 31, 2025 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Market Risk Benefit [Line Items]
Market risk benefits, net	$ 5,114	$ 4,716	$ 4,212	$ 3,715
Minimum \| Nonperformance risk \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefits, measurement input (as percent)	0.003		0.003
Minimum \| Option budget \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefits, measurement input (as percent)	0.005		0.005
Minimum \| Surrender rate \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefits, measurement input (as percent)	0.040		0.031
Minimum \| Utilization rate \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefits, measurement input (as percent)	0.286		0.286
Maximum \| Nonperformance risk \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefits, measurement input (as percent)	0.011		0.011
Maximum \| Option budget \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefits, measurement input (as percent)	0.059		0.060
Maximum \| Surrender rate \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefits, measurement input (as percent)	0.075		0.067
Maximum \| Utilization rate \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefits, measurement input (as percent)	0.950		0.950
Weighted Average \| Nonperformance risk \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefits, measurement input (as percent)	0.009		0.010
Weighted Average \| Option budget \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefits, measurement input (as percent)	0.027		0.025
Weighted Average \| Surrender rate \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefits, measurement input (as percent)	0.051		0.044
Weighted Average \| Utilization rate \| Discounted cash flow
Market Risk Benefit [Line Items]
Market risk benefits, measurement input (as percent)	0.867		0.854