Interest Income and Interest Expense - Summary (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest income
Investment securities	$ 2,759	$ 2,282	$ 2,175
Loans	4,209	4,142	4,783
Securities purchased under agreements to resell	(181)	458	2,281
Securities borrowed	(1,017)	(652)	1,204
Trading assets, net of Trading liabilities	2,038	2,417	2,899
Customer receivables and Other	1,603	1,515	3,756
Total interest income	9,411	10,162	17,098
Interest expense
Deposits	409	953	1,885
Borrowings	2,725	3,250	5,052
Securities sold under agreements to repurchase	93	564	1,967
Securities loaned	401	419	642
Customer payables and Other	(2,262)	(1,337)	2,858
Total interest expense	1,366	3,849	12,404
Net interest	$ 8,045	$ 6,313	$ 4,694