Expenses - Schedule of Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Other Expenses [Abstract]
Professional services	$ 84	$ 75	$ 181	$ 155
Sales advertising public relations	22	16	41	33
Regulatory fees and assessments	20	19	40	37
Securities processing	12	2	20	14
Bank operations	9	2	13	4
Insurance	2	3	6	6
Donations	7	0	13
Other	106	82	191	172
Total other expenses	$ 262	$ 199	$ 505	$ 421