Expenses - Schedule of Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Expenses [Abstract]
Professional services	$ 321	$ 357	$ 340
Sales advertising public relations	114	115	67
Securities processing	75	52	10
Regulatory fees and assessments	73	91	108
Bank operations	43	70	80
Donations	51	12	17
Insurance	19	18	20
Other	566	461	287
Total other expenses	$ 1,262	$ 1,176	$ 929