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Business Segments (Tables) | 9 Months Ended
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Sep. 30, 2018
Segment Reporting [Abstract] |
Schedule of Operating Segments | The following table presents certain information regarding our operating segments for the three and nine months ended September 30, 2018 and 2017:
| Market Services |  | Corporate Services |  | Information Services |  | Market Technology |  | Corporate Items |  | Consolidated
| (in millions)
Three Months Ended September 30, 2018 |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ | 586 |  |  | $ | 131 |  |  | $ | 179 |  |  | $ | 68 |  |  | $ | — |  |  | $ | 964 |
Transaction-based expenses | (364 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (364 | )
Revenues less transaction-based expenses | 222 |  |  | 131 |  |  | 179 |  |  | 68 |  |  | — |  |  | 600 |
Operating income (loss) | $ | 121 |  |  | $ | 42 |  |  | $ | 117 |  |  | $ | 9 |  |  | $ | (43 | ) |  | $ | 246 |
Three Months Ended September 30, 2017 |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ | 581 |  |  | $ | 126 |  |  | $ | 150 |  |  | $ | 62 |  |  | $ | 46 |  |  | $ | 965 |
Transaction-based expenses | (362 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (362 | )
Revenues less transaction-based expenses | 219 |  |  | 126 |  |  | 150 |  |  | 62 |  |  | 46 |  |  | 603 |
Operating income (loss) | $ | 118 |  |  | $ | 41 |  |  | $ | 111 |  |  | $ | 14 |  |  | $ | (22 | ) |  | $ | 262 |
Nine Months Ended September 30, 2018 |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ | 1,968 |  |  | $ | 395 |  |  | $ | 528 |  |  | $ | 194 |  |  | $ | 56 |  |  | $ | 3,141 |
Transaction-based expenses | (1,259 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (1,259 | )
Revenues less transaction-based expenses | 709 |  |  | 395 |  |  | 528 |  |  | 194 |  |  | 56 |  |  | 1,882 |
Operating income (loss) | $ | 402 |  |  | $ | 122 |  |  | $ | 342 |  |  | $ | 20 |  |  | $ | (99 | ) |  | $ | 787 |
Nine Months Ended September 30, 2017 |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ | 1,808 |  |  | $ | 370 |  |  | $ | 432 |  |  | $ | 176 |  |  | $ | 143 |  |  | $ | 2,929 |
Transaction-based expenses | (1,149 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (1,149 | )
Revenues less transaction-based expenses | 659 |  |  | 370 |  |  | 432 |  |  | 176 |  |  | 143 |  |  | 1,780 |
Operating income (loss) | $ | 359 |  |  | $ | 115 |  |  | $ | 318 |  |  | $ | 39 |  |  | $ | (81 | ) |  | $ | 750 |
Schedule of Corporate Items | A summary of our corporate items is as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in millions)
Revenues - divested businesses | $ | — |  |  | $ | 46 |  |  | $ | 56 |  |  | $ | 143 |
Expenses: |  |  |  |  |  |  |
Amortization expense of acquired intangible assets | 27 |  |  | 22 |  |  | 83 |  |  | 67 |
Merger and strategic initiatives expense | 6 |  |  | 3 |  |  | 7 |  |  | 20 |
Clearing default loss | 8 |  |  | — |  |  | 8 |  |  | — |
Extinguishment of debt | — |  |  | — |  |  | — |  |  | 10 |
Expenses - divested businesses | — |  |  | 42 |  |  | 51 |  |  | 125 |
Other | 2 |  |  | 1 |  |  | 6 |  |  | 2 |
Total expenses | 43 |  |  | 68 |  |  | 155 |  |  | 224 |
Operating loss | $ | (43 | ) |  | $ | (22 | ) |  | $ | (99 | ) |  | $ | (81 | )

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