Expenses - Schedule of Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Other Expenses [Abstract]
Professional services	$ 334	$ 364	$ 321
Sales advertising public relations	73	77	114
Regulatory fees and assessments	69	61	73
Securities processing	34	41	75
Bank operations	12	18	43
Insurance	12	14	19
Donations	2	20	51
Other	360	370	566
Total other expenses	$ 896	$ 965	$ 1,262