Expenses - Schedule of Expenses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Other Expenses [Abstract]
Professional services	$ 99	$ 92	$ 315	$ 273
Sales advertising and public relations	38	28	91	69
Regulatory fees and assessments	18	19	62	63
Securities processing	10	21	35	41
Bank operations	9	11	33	24
Donations	13	7	26	20
Other	98	96	279	289
Total other expenses	$ 285	$ 274	$ 841	$ 779