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Fair Value Measurement (Schedule Of Reconciliation Of Assets And Liabilities Measured At Fair Value Using Significant Unobservable Inputs (Level 3) On A Recurring Basis) (Details) - Level 3 - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Junior Subordinated Debentures, at Fair Value        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Change in unrealized gains or losses for the period included in earnings for assets and liabilities held at end of period $ (7) $ (8) $ (20) $ (23)
Change in unrealized gains or losses for the period included in other comprehensive income for assets and liabilities held at end of period (8) (2) 0 4
Junior subordinated debentures, at fair value        
Beginning Balance 323 310 331 316
Change included in earnings (7) (8) (20) (23)
Change in fair values included in comprehensive income/loss (8) (2) 0 4
Purchases and issuances 0 0 0 0
Sales and settlements 7 8 20 23
Ending Balance 331 312 331 312
Residential Mortgage Servicing Rights        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Change in unrealized gains or losses for the period included in earnings for assets and liabilities held at end of period 0 (6) (3) (2)
Change in unrealized gains or losses for the period included in other comprehensive income for assets and liabilities held at end of period 0 0 0 0
Residential mortgage servicing rights        
Beginning balance 103 110 108 109
Change included in earnings (3) (9) (12) (11)
Change in fair values included in comprehensive income/loss 0 0 0 0
Purchases and issuances 1 1 5 4
Sales and settlements 0 0 0 0
Ending balance $ 101 $ 102 $ 101 $ 102