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Long Term Subordinated Notes (Schedule Of Interest Expense Incurred In Connection With Long Term Subordinated Notes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Subordinated Debt [Member]      
Debt Instrument [Line Items]      
Interest expense incurred $ 9 $ 6 $ 8