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Related Party Transactions (Shared Service and Overhead Allocations - Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Insurance Commissions and Fees $ 743 $ 701  
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 228 256  
Related Party Transaction, Amounts of Transaction 0 22  
Affiliated Entity      
Insurance Commissions and Fees 57 $ 53  
All Services and Transactions Except Broker Dealer Activities [Member]      
Due from (to) Related Parties $ (63)   $ (21)