Loans - Consumer, Excluding Credit Card Loan Portfolio (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retained loans	$ 1,265,941	$ 1,089,598	$ 1,068,073
Consumer, excluding credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retained loans	397,054	300,753	$ 301,403
Consumer, excluding credit card | First Republic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retained loans	91,200
Consumer, excluding credit card | Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retained loans	327,635	237,561
Consumer, excluding credit card | Residential real estate | First Republic
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retained loans	91,200
Consumer, excluding credit card | Auto and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Retained loans	$ 69,419	$ 63,192