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Investments (Assets on Deposit, Held in Trust and Restricted as to Sale) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Assets on Deposit, Held in Trust and Restricted as to Sale [Line Items]    
Assets on deposit with governmental authorities or trustees $ 8 $ 10
Assets held in voluntary trusts 510 476
Assets held in trust related to reinsurance and other agreements 13,214 12,815
Securities restricted as to sale 144 149
Total assets on deposit, assets held in trust and securities restricted as to sale 13,876 13,450
Wholly-owned subsidiaries    
Assets on Deposit, Held in Trust and Restricted as to Sale [Line Items]    
Assets held in trust related to reinsurance and other agreements $ 25,700 $ 26,000