Discontinued Operations - Summary of Operating Results of the Discontinued Insurance Agency Business (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest on other earning assets	$ 7	$ 20	$ 31	$ 21
Total interest income	7	20	31	21
Insurance income	427	938	1,319	1,753
Other income	4	5	9	8
Total noninterest income	431	943	1,328	1,761
Personnel expense	251	551	885	1,064
Professional fees and outside processing	37	41	85	68
Software expense	8	14	25	28
Net occupancy expense	5	14	20	28
Amortization of intangibles	0	32	21	68
Equipment expense	2	5	11	13
Marketing and customer development	5	10	15	20
Restructuring charges	63	6	82	13
Other expense	26	57	84	109
Total noninterest expense	397	730	1,228	1,411
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	6,903	0	6,903	0
Income before income taxes from discontinued operations	6,944	233	7,034	371
Provision for income taxes	2,116	57	2,139	90
Net income from discontinued operations	4,828	176	4,895	281
Net Income (Loss) Attributable to Noncontrolling Interest	19	36	22	38
Net income from discontinued operations attributable to controlling interest	$ 4,809	$ 140	$ 4,873	$ 243