Expenses - Schedule of Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Other Expenses [Abstract]
Professional services	$ 97	$ 80
Regulatory fees and assessments	20	18
Sales advertising public relations	19	17
Securities processing	8	12
Donations	6	0
Insurance	4	3
Bank operations	4	2
Other	85	90
Total other expenses	$ 243	$ 222