v3.26.3
Debt Securities (Schedule Of Fair Value And Unrealized Losses Of Securities) (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 7,881 $ 1,366
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (411) (9)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,646 3,371
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (487) (371)
Debt Securities, Available-for-sale, Unrealized Loss Position 10,527 4,737
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (898) (380)
U.S. Treasury and agencies    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 445 50
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (7) 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 681 778
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (49) (38)
Debt Securities, Available-for-sale, Unrealized Loss Position 1,126 828
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (56) (38)
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,281 29
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (86) 0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 128 219
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (23) (15)
Debt Securities, Available-for-sale, Unrealized Loss Position 1,409 248
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss (109) (15)
Mortgage-backed securities and collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 6,155 1,287
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (318) (9)
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,837 2,374
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (415) (318)
Debt Securities, Available-for-sale, Unrealized Loss Position 7,992 3,661
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ (733) $ (327)