Business Combinations - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		5 Months Ended	9 Months Ended		17 Months Ended
	May 01, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024
Business Acquisition [Line Items]
Estimated bargain purchase gain associated with the First Republic acquisition			$ 100			$ 2,812
Increase to estimated bargain purchase gain		$ 0			$ 103
Provision for credit losses		$ 3,111	$ 1,384		8,047	$ 6,558
First Republic
Business Acquisition [Line Items]
Estimated bargain purchase gain associated with the First Republic acquisition	$ 2,700			$ 2,800			$ 2,878
Increase to estimated bargain purchase gain					$ 103
Provision for credit losses				$ 1,200