Trading Activities, Net Interest Income and Net Gains (Losses) from Trading Activities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net Interest Income and Net Gains (Losses) from Trading Activities [Line Items]
Interest income	$ 1,453	$ 1,143	$ 4,065	$ 3,080
Interest expense	211	163	604	467
Total net interest income	1,242	980	3,461	2,613
Total net gains (losses) from trading activities	1,438	1,265	4,334	3,729
Total trading-related net interest and noninterest income	2,680	2,245	7,795	6,342
Interest rate [Member]
Net Interest Income and Net Gains (Losses) from Trading Activities [Line Items]
Total net gains (losses) from trading activities	862	(443)	1,647	206
Commodity [Member]
Net Interest Income and Net Gains (Losses) from Trading Activities [Line Items]
Total net gains (losses) from trading activities	110	74	321	238
Equity [Member]
Net Interest Income and Net Gains (Losses) from Trading Activities [Line Items]
Total net gains (losses) from trading activities	254	435	993	898
Foreign Exchange
Net Interest Income and Net Gains (Losses) from Trading Activities [Line Items]
Total net gains (losses) from trading activities	(137)	1,253	763	2,047
Credit [Member]
Net Interest Income and Net Gains (Losses) from Trading Activities [Line Items]
Total net gains (losses) from trading activities	$ 349	$ (54)	$ 610	$ 340