Interest Income and Interest Expense - Sources of Interest Income and Interest Expense (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest income and expense
Deposits with banks	$ 3,065	$ 1,107	$ 8,331	$ 1,392
Collateralized agreements	4,287	1,542	11,744	1,712
Trading assets	2,222	1,334	5,990	3,551
Investments	1,001	578	2,729	1,433
Loans	3,797	2,487	10,942	5,937
Other interest	3,885	1,502	10,295	2,588
Total interest income	18,257	8,550	50,031	16,613
Deposits	4,433	1,811	11,959	2,975
Collateralized financings	3,635	990	9,131	1,308
Trading liabilities	633	513	1,769	1,427
Short-term borrowings	317	152	848	333
Long-term borrowings	2,913	1,503	8,285	3,433
Other interest	4,779	1,538	13,027	1,533
Total interest expense	16,710	6,507	45,019	11,009
Net interest income	$ 1,547	$ 2,043	$ 5,012	$ 5,604