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.

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Market Risk Benefits - Significant Inputs and Assumptions (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Market Risk Benefit [Line Items]
Market risk benefits	$ 1,133	$ 1,841	$ 1,103	$ 2,901	$ 4,829
Increase (decrease) from change in assumptions	$ 0	$ 0	(139)	$ 123
Utilization of guaranteed withdrawals
Market Risk Benefit [Line Items]
Increase (decrease) from change in assumptions			(39)
Surrender rate
Market Risk Benefit [Line Items]
Increase (decrease) from change in assumptions			(200)
Mortality rate
Market Risk Benefit [Line Items]
Increase (decrease) from change in assumptions			$ (49)
Discounted cash flow \| Nonperformance risk
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.0115		0.0095
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	0.002		0.002
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	0.456		0.456
Maximum \| Discounted cash flow \| Market volatility
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.251		0.266
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	0.111		0.110
Weighted average \| Discounted cash flow \| Surrender rate
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.036		0.036
Weighted average \| Discounted cash flow \| Market volatility
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.111		0.121
Weighted average \| Discounted cash flow \| Nonperformance risk
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.0115		0.0095
Weighted average \| Discounted cash flow \| Mortality rate
Market Risk Benefit [Line Items]
Market risk benefits, measurement input	0.015		0.015