Expenses - Schedule of Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Expenses [Abstract]
Professional services	$ 465	$ 428	$ 375
Regulatory fees and assessments	142	464	83
Sales advertising and public relations	142	142	99
Securities processing	78	49	63
Bank operations	51	45	41
Donations	28	27	27
Other	433	374	387
Total other expenses	1,339	1,529	$ 1,075
FDIC special assessment, recovery of estimated losses	$ 99	$ 387