Derivative Financial Instruments And Hedging Activities (Schedule Of Gains (Losses) Recognized Related To Derivatives Not Designated As Hedging Instruments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	$ 72	$ 87	$ 26
Capital markets income [Member] \| Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	74	127	49
Capital markets income [Member] \| Interest rate swaps \| Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	29	29	(17)
Capital markets income [Member] \| Interest rate options \| Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	41	52	42
Capital markets income [Member] \| Interest rate futures and forward commitments \| Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	16	23	13
Capital markets income [Member] \| Other Contracts [Member] \| Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	(12)	23	11
Mortgage Income [Member] \| Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	(2)	(40)	(23)
Mortgage Income [Member] \| Interest rate swaps \| Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	(4)	(44)	(14)
Mortgage Income [Member] \| Interest rate options \| Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	(4)	(4)	1
Mortgage Income [Member] \| Interest rate futures and forward commitments \| Not Designated as Hedging Instrument
Derivative [Line Items]
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments	$ 6	$ 8	$ (10)