Expenses - Schedule of Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Other Expenses [Abstract]
Professional services	$ 106	$ 97
Regulatory fees and assessments	26	20
Sales advertising and public relations	23	19
Bank operations	11	4
Securities processing	10	8
Donations	7	6
Other	87	89
Total other expenses	$ 270	$ 243