Investment Securities - Narrative (Details)	12 Months Ended
	Dec. 31, 2025 USD ($) security	Dec. 31, 2024 USD ($) security	Dec. 31, 2023 USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Gains (losses) from sales of available-for-sale securities, net	$ 4,000,000	$ (79,000,000)	$ (294,000,000)
Debt securities, AFS, allowance	$ 0	0
Percentage of investment portfolio considered investment grade	99.00%
Pre-tax unrealized losses	$ (4,120,000,000)	$ (6,120,000,000)
Number of securities in loss position | security	1,342	1,564
ABS and municipal bonds
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Securities sold	$ 16,000,000,000.00	$ 10,970,000,000	4,920,000,000
Gains (losses) from sales of available-for-sale securities, net	4,000,000	(79,000,000)	$ (294,000,000)
Designated as pledged
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Pledged securities not separately reported	$ 74,140,000,000	$ 86,700,000,000