Segment, Geographic and Revenue Information - Institutional Securities - Investment Banking Revenues (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Revenue from External Customer [Line Items] | ||
| Investment banking | $ 2,289 | $ 1,711 |
| Firm Investment banking revenues from contracts with customers (as a percent) | 86.00% | 81.00% |
| Institutional Securities1 | Operating Segments | ||
| Revenue from External Customer [Line Items] | ||
| Investment banking | $ 2,116 | $ 1,559 |
| Institutional Securities1 | Operating Segments | Institutional Securities Advisory | ||
| Revenue from External Customer [Line Items] | ||
| Investment banking | 978 | 563 |
| Institutional Securities1 | Operating Segments | Institutional Securities Underwriting | ||
| Revenue from External Customer [Line Items] | ||
| Investment banking | $ 1,138 | $ 996 |