Fair Value Measurements (Summary Of Quantitative Information About Level 3 Fair Value Measurements) (Details) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2026 USD ($)	Dec. 31, 2025 USD ($)	Mar. 31, 2026 USD ($)	Jun. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing Asset at Fair Value, Amount	$ 958	$ 970
Residential Mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing Asset at Fair Value, Amount	958	970	$ 954	$ 988	$ 979	$ 1,007
Commercial Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing Asset at Fair Value, Amount	93	93	$ 93	$ 93	$ 94	$ 97
Level 3 [Member] \| Residential Mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing Asset at Fair Value, Amount	958	970
Level 3 [Member] \| Commercial Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing Asset at Fair Value, Amount		93
Recurring Fair Value Measurements \| Residential Mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing Asset at Fair Value, Amount	958	970
Recurring Fair Value Measurements \| Commercial Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing Asset at Fair Value, Amount	93	93
Recurring Fair Value Measurements \| Level 3 [Member] \| Residential Mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing Asset at Fair Value, Amount	958	970
Recurring Fair Value Measurements \| Level 3 [Member] \| Commercial Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Servicing Asset at Fair Value, Amount	$ 93	$ 93
Recurring Fair Value Measurements \| Minimum [Member] \| Discounted Cash Flow [Member] \| Residential Mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.044	0.042
Option-Adjusted Spread	4.70%	4.70%
Recurring Fair Value Measurements \| Minimum [Member] \| Discounted Cash Flow [Member] \| Commercial Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.076	0.065
Measurement Input, Discount Rate	8.00%	8.00%
Recurring Fair Value Measurements \| Maximum [Member] \| Discounted Cash Flow [Member] \| Residential Mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.148	0.169
Option-Adjusted Spread	8.00%	8.00%
Recurring Fair Value Measurements \| Maximum [Member] \| Discounted Cash Flow [Member] \| Commercial Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.079	0.076
Measurement Input, Discount Rate	10.00%	10.00%
Recurring Fair Value Measurements \| Weighted Average [Member] \| Discounted Cash Flow [Member] \| Residential Mortgage
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.074	0.075
Option-Adjusted Spread	5.00%	5.00%
Recurring Fair Value Measurements \| Weighted Average [Member] \| Discounted Cash Flow [Member] \| Commercial Real Estate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted Average CPR	0.079	0.075
Measurement Input, Discount Rate	8.20%	8.20%