Fair Value of Assets and Liabilities - Schedule of Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, fair value	$ 151	$ 85
Loans and leases	64,156	62,565
Non Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases	370	344	$ 245
OREO	3	3	4
Other assets			90
Net gains (losses), Loans and leases	(64)	(73)	(42)
Net gains (losses), OREO	0	0	0
Net gains (losses), other assets			(7)
Net gains (losses) financial assets	(64)	(74)	(52)
Level 1 | Non Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases	0	0	0
OREO	0	0	0
Other assets			0
Level 2 | Non Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases	0	0	0
OREO	0	0	0
Other assets			0
Level 3 | Non Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans and leases	370	344	245
OREO	3	3	4
Other assets			90
SBAs and USDA | Non Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, fair value	233	438	406
Net gains (losses), Loans held for sale	0	(1)	(3)
SBAs and USDA | Level 1 | Non Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, fair value	0	0	0
SBAs and USDA | Level 2 | Non Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, fair value	233	438	406
SBAs and USDA | Level 3 | Non Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale, fair value	$ 0	$ 0	$ 0