Expenses - Schedule of Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Other Expenses [Abstract]
Professional services	$ 110	$ 84	$ 216	$ 181
Sales advertising and public relations	30	22	53	41
Regulatory fees and assessments	18	20	44	40
Securities processing	15	12	25	20
Bank operations	13	9	24	13
Donations	7	7	14	13
Other	93	108	180	197
Total other expenses	$ 286	$ 262	$ 556	$ 505