| Operating segment information |
The following table presents certain selected financial information for our reportable operating segments and Corporate & Other as of or for the three and nine months ended September 30: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended September 30, 2021 (Millions, except where indicated) | | GCSG | | GCS | | GMNS | | Corporate & Other (a) | | Consolidated | | Total non-interest revenues | | $ | 4,699 | | | $ | 2,978 | | | $ | 1,280 | | | $ | (23) | | | $ | 8,934 | | Revenue from contracts with customers (b) | | 3,392 | | | 2,556 | | | 1,198 | | | (7) | | | 7,139 | | | Interest income | | 1,879 | | | 378 | | | 4 | | | 40 | | | 2,301 | | | Interest expense | | 174 | | | 111 | | | (24) | | | 46 | | | 307 | | | Total revenues net of interest expense | | 6,404 | | | 3,245 | | | 1,308 | | | (29) | | | 10,928 | | | Pretax segment income (loss) | | $ | 1,488 | | | $ | 718 | | | $ | 529 | | | $ | (285) | | | $ | 2,450 | | Total assets (billions) | | $ | 92 | | | $ | 48 | | | $ | 14 | | | $ | 30 | | | $ | 184 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Nine Months Ended September 30, 2021 (Millions, except where indicated) | | GCSG | | GCS | | GMNS | | Corporate & Other (a) | | Consolidated | | Total non-interest revenues | | $ | 12,982 | | | $ | 8,225 | | | $ | 3,545 | | | $ | (159) | | | $ | 24,593 | | Revenue from contracts with customers (b) | | 9,229 | | | 7,019 | | | 3,327 | | | (20) | | | 19,555 | | | Interest income | | 5,436 | | | 1,059 | | | 12 | | | 126 | | | 6,633 | | | Interest expense | | 536 | | | 338 | | | (61) | | | 178 | | | 991 | | | Total revenues net of interest expense | | 17,882 | | | 8,946 | | | 3,618 | | | (211) | | | 30,235 | | | Pretax segment income (loss) | | $ | 5,525 | | | $ | 2,222 | | | $ | 1,441 | | | $ | (805) | | | $ | 8,383 | | Total assets (billions) | | $ | 92 | | | $ | 48 | | | $ | 14 | | | $ | 30 | | | $ | 184 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended September 30, 2020 (Millions, except where indicated) | | GCSG | | GCS | | GMNS | | Corporate & Other (a) | | Consolidated | | Total non-interest revenues | | $ | 3,632 | | | $ | 2,327 | | | $ | 997 | | | $ | (79) | | | $ | 6,877 | | Revenue from contracts with customers (b) | | 2,476 | | | 1,969 | | | 941 | | | (6) | | | 5,380 | | | Interest income | | 1,916 | | | 351 | | | 4 | | | 53 | | | 2,324 | | | Interest expense | | 244 | | | 139 | | | (19) | | | 86 | | | 450 | | | Total revenues net of interest expense | | 5,304 | | | 2,539 | | | 1,020 | | | (112) | | | 8,751 | | | Pretax segment income (loss) | | $ | 1,125 | | | $ | 272 | | | $ | 326 | | | $ | (359) | | | $ | 1,364 | | Total assets (billions) | | $ | 82 | | | $ | 40 | | | $ | 12 | | | $ | 53 | | | $ | 187 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Nine Months Ended September 30, 2020 (Millions, except where indicated) | | GCSG | | GCS | | GMNS | | Corporate & Other (a) | | Consolidated | | Total non-interest revenues | | $ | 10,662 | | | $ | 7,129 | | | $ | 3,057 | | | $ | (200) | | | $ | 20,648 | | Revenue from contracts with customers (b) | | 7,205 | | | 5,993 | | | 2,857 | | | (22) | | | 16,033 | | | Interest income | | 6,298 | | | 1,252 | | | 14 | | | 232 | | | 7,796 | | | Interest expense | | 844 | | | 493 | | | (61) | | | 432 | | | 1,708 | | | Total revenues net of interest expense | | 16,116 | | | 7,888 | | | 3,132 | | | (400) | | | 26,736 | | | Pretax segment income (loss) | | $ | 2,227 | | | $ | 269 | | | $ | 1,039 | | | $ | (1,097) | | | $ | 2,438 | | Total assets (billions) | | $ | 82 | | | $ | 40 | | | $ | 12 | | | $ | 53 | | | $ | 187 | |
(a)Corporate & Other includes adjustments and eliminations for intersegment activity. (b)Includes discount revenue, certain other fees and commissions and other revenues from customers.
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