Fair Value (Nonrecurring Fair Value Measurements) (Details) - Fair Value, Nonrecurring - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 676		$ 676		$ 725
Gains (Losses)	(63)	$ (44)	(82)	$ (99)
Level 3 \| Nonaccrual loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	366		366		510
Gains (Losses)	(33)	(38)	(52)	(93)
Level 3 \| Equity investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	253		253		147
Gains (Losses)	5	(2)	5	(2)
Level 3 \| Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0		0		13
Gains (Losses)	(33)	0	(33)	0
Level 3 \| OREO, foreclosed and other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	48		48		49
Gains (Losses)	(1)	(1)	(1)	(1)
Level 3 \| Long-lived assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	9		9		6
Gains (Losses)	$ (1)	$ (3)	$ (1)	$ (3)
Level 2 \| Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value					$ 13