Expenses - Schedule of Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other Expenses [Abstract]
Regulatory fees and assessments	$ 141	$ 26
Professional services	110	106
Sales advertising and public relations	25	23
Donations	25	7
Securities processing	8	10
Bank operations	8	11
Other	101	87
Total other expenses	418	$ 270
FDIC special assessment expense	$ 130