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Related Party Transactions (Effects of Affiliated Reinsurance on Balance Sheets) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Effects of Reinsurance [Line Items]      
Premiums, reinsurance and other receivables (net of allowance for credit losses) $ 18,570 $ 18,145  
Market risk benefit liabilities 10,751 10,411 $ 16,062
Other liabilities 5,616 6,515  
Affiliated Entity | Assumed      
Effects of Reinsurance [Line Items]      
Premiums, reinsurance and other receivables (net of allowance for credit losses) 28 29  
Future policy benefits 45 31  
Market risk benefit liabilities 434 428  
Other policy-related balances 13 11  
Other liabilities $ 4 $ 11