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Investments (Variable Interest Entities) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Variable Interest Entity [Line Items]      
Carrying amount $ 230,002 $ 224,847 $ 262,257
VIE, Not Primary Beneficiary      
Variable Interest Entity [Line Items]      
Carrying amount 20,201 20,032  
Maximum exposure to loss 22,840 22,962  
VIE, Not Primary Beneficiary | Fixed maturity securities      
Variable Interest Entity [Line Items]      
Carrying amount 16,017 15,896  
Maximum exposure to loss 17,409 17,471  
VIE, Not Primary Beneficiary | Limited partnerships and LLCs      
Variable Interest Entity [Line Items]      
Carrying amount 4,184 4,136  
Maximum exposure to loss $ 5,431 $ 5,491