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Reinsurance - Receivables from Reinsurers (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Reinsurance receivables related to insurance reserves:    
Ceded claim and claim adjustment expenses $ 5,191 $ 4,969
Ceded future policy benefits 288
Reinsurance receivables related to paid losses 247 227
Reinsurance receivables 5,438 5,484
Less allowance for doubtful accounts 22 21
Reinsurance receivables, net of allowance for doubtful accounts $ 5,416 $ 5,463