Investments (Variable Interest Entities) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Carrying amount	$ 220,333	$ 215,438	$ 249,731
VIE, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Carrying amount	20,073	19,904
Maximum exposure to loss	22,691	22,812
VIE, Not Primary Beneficiary | Fixed maturity securities
Variable Interest Entity [Line Items]
Carrying amount	15,902	15,781
Maximum exposure to loss	17,274	17,334
VIE, Not Primary Beneficiary | Limited partnerships and LLCs
Variable Interest Entity [Line Items]
Carrying amount	4,171	4,123
Maximum exposure to loss	$ 5,417	$ 5,478