Expenses - Schedule of Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Other Expenses [Abstract]
Professional services	$ 110	$ 110
Sales advertising and public relations	25	25
Regulatory fees and assessments	13	141
Bank operations	13	8
Donations	4	25
Securities processing	4	8
Other	107	101
Total other expenses	$ 276	418
FDIC special assessment expense		$ 130