Segment, Geographic and Revenue Information - Institutional Securities - Investment Banking Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from External Customer [Line Items]
Investment banking	$ 10,994	$ 7,674	$ 6,163
Firm Investment banking revenues from contracts with customers	91.00%	92.00%	90.00%
IS | Operating Segments
Revenue from External Customer [Line Items]
Investment banking	$ 10,272	$ 7,204	$ 5,734
IS | Operating Segments | Advisory
Revenue from External Customer [Line Items]
Investment banking	3,487	2,008	2,116
IS | Operating Segments | Underwriting
Revenue from External Customer [Line Items]
Investment banking	$ 6,785	$ 5,196	$ 3,618