Segment, Geographic and Revenue Information - Institutional Securities - Investment Banking Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue from External Customer [Line Items]
Investment banking	$ 1,373	$ 3,013	$ 4,281	$ 8,413
Firm Investment banking revenues from contracts with customers (as a percent)	89.00%	91.00%	89.00%	91.00%
Institutional Securities | Operating Segments
Revenue from External Customer [Line Items]
Investment banking	$ 1,277	$ 2,849	$ 3,983	$ 7,838
Institutional Securities | Operating Segments | Institutional Securities Advisory
Revenue from External Customer [Line Items]
Investment banking	693	1,272	2,235	2,416
Institutional Securities | Operating Segments | Institutional Securities Underwriting
Revenue from External Customer [Line Items]
Investment banking	$ 584	$ 1,577	$ 1,748	$ 5,422