Business Segments - Segment Operating Results (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2021 |
Jun. 30, 2020 |
Jun. 30, 2021 |
Jun. 30, 2020 |
|
| Segment Reporting Information [Line Items] | ||||
| Non-interest revenues | $ 13,759 | $ 12,351 | $ 29,981 | $ 19,781 |
| Net interest income | 1,629 | 944 | 3,111 | 2,257 |
| Total net revenues | 15,388 | 13,295 | 33,092 | 22,038 |
| Provision for credit losses | (92) | 1,590 | (162) | 2,527 |
| Operating expenses | 8,640 | 10,414 | 18,077 | 16,872 |
| Pre-tax earnings/(loss) | 6,840 | 1,291 | 15,177 | 2,639 |
| Net earnings/(loss) | 5,486 | 373 | 12,322 | 1,586 |
| Net earnings/(loss) to common | 5,347 | 197 | 12,058 | 1,320 |
| Average common equity | $ 90,091 | $ 80,599 | $ 88,246 | $ 79,753 |
| Return on average common equity | 23.70% | 1.00% | 27.30% | 3.30% |
| Investment Banking [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Non-interest revenues | $ 3,485 | $ 2,664 | $ 7,156 | $ 4,710 |
| Net interest income | 124 | (7) | 224 | 131 |
| Total net revenues | 3,609 | 2,657 | 7,380 | 4,841 |
| Provision for credit losses | (107) | 819 | (270) | 1,441 |
| Operating expenses | 1,955 | 2,704 | 3,818 | 3,873 |
| Pre-tax earnings/(loss) | 1,761 | (866) | 3,832 | (473) |
| Net earnings/(loss) | 1,413 | (639) | 3,111 | (285) |
| Net earnings/(loss) to common | 1,393 | (662) | 3,072 | (319) |
| Average common equity | $ 9,792 | $ 11,070 | $ 10,078 | $ 11,141 |
| Return on average common equity | 56.90% | (23.90%) | 61.00% | (5.70%) |
| Global Markets [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Non-interest revenues | $ 4,158 | $ 6,547 | $ 11,178 | $ 11,199 |
| Net interest income | 742 | 629 | 1,303 | 1,140 |
| Total net revenues | 4,900 | 7,176 | 12,481 | 12,339 |
| Provision for credit losses | 14 | 183 | (6) | 251 |
| Operating expenses | 3,373 | 5,179 | 7,558 | 8,026 |
| Pre-tax earnings/(loss) | 1,513 | 1,814 | 4,929 | 4,062 |
| Net earnings/(loss) | 1,201 | 419 | 4,002 | 2,442 |
| Net earnings/(loss) to common | 1,121 | 305 | 3,851 | 2,269 |
| Average common equity | $ 44,430 | $ 42,702 | $ 42,741 | $ 40,970 |
| Return on average common equity | 10.10% | 2.90% | 18.00% | 11.10% |
| Asset Management [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Non-interest revenues | $ 5,014 | $ 2,176 | $ 9,445 | $ 1,909 |
| Net interest income | 118 | (75) | 301 | 96 |
| Total net revenues | 5,132 | 2,101 | 9,746 | 2,005 |
| Provision for credit losses | (65) | 271 | (12) | 350 |
| Operating expenses | 1,943 | 1,332 | 3,833 | 2,530 |
| Pre-tax earnings/(loss) | 3,254 | 498 | 5,925 | (875) |
| Net earnings/(loss) | 2,620 | 710 | 4,810 | (526) |
| Net earnings/(loss) to common | 2,592 | 684 | 4,757 | (566) |
| Average common equity | $ 25,410 | $ 19,322 | $ 25,092 | $ 20,371 |
| Return on average common equity | 40.80% | 14.20% | 37.90% | (5.60%) |
| Consumer & Wealth Management [Member] | ||||
| Segment Reporting Information [Line Items] | ||||
| Non-interest revenues | $ 1,102 | $ 964 | $ 2,202 | $ 1,963 |
| Net interest income | 645 | 397 | 1,283 | 890 |
| Total net revenues | 1,747 | 1,361 | 3,485 | 2,853 |
| Provision for credit losses | 66 | 317 | 126 | 485 |
| Operating expenses | 1,369 | 1,199 | 2,868 | 2,443 |
| Pre-tax earnings/(loss) | 312 | (155) | 491 | (75) |
| Net earnings/(loss) | 252 | (117) | 399 | (45) |
| Net earnings/(loss) to common | 241 | (130) | 378 | (64) |
| Average common equity | $ 10,459 | $ 7,505 | $ 10,335 | $ 7,271 |
| Return on average common equity | 9.20% | (6.90%) | 7.30% | (1.80%) |