Expenses - Schedule of Expenses (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Other Expenses [Abstract]
Professional services	$ 111		$ 110	$ 221	$ 216
Sales advertising and public relations	34		30	59	53
Securities processing	19		15	27	25
Bank operations	14		13	22	24
Regulatory fees and assessments	9		18	150	44
Donations	1		7	26	14
Other	112		93	213	180
Total other expenses	$ 300		$ 286	$ 718	$ 556
FDIC special assessment expense		$ 130