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Business Segments (Schedule of Operating Segments) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | $ 964 | $ 965 | $ 3,141 | $ 2,929
Transaction-based expenses | (364) | (362) | (1,259) | (1,149)
Revenues less transaction-based expenses | 600 | 603 | 1,882 | 1,780
Operating income (loss) | 246 | 262 | 787 | 750
Operating Segments | Market Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 586 | 581 | 1,968 | 1,808
Transaction-based expenses | (364) | (362) | (1,259) | (1,149)
Revenues less transaction-based expenses | 222 | 219 | 709 | 659
Operating income (loss) | 121 | 118 | 402 | 359
Operating Segments | Corporate Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 131 | 126 | 395 | 370
Transaction-based expenses | 0 | 0 | 0 | 0
Revenues less transaction-based expenses | 131 | 126 | 395 | 370
Operating income (loss) | 42 | 41 | 122 | 115
Operating Segments | Information Services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 179 | 150 | 528 | 432
Transaction-based expenses | 0 | 0 | 0 | 0
Revenues less transaction-based expenses | 179 | 150 | 528 | 432
Operating income (loss) | 117 | 111 | 342 | 318
Operating Segments | Market Technology |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 68 | 62 | 194 | 176
Transaction-based expenses | 0 | 0 | 0 | 0
Revenues less transaction-based expenses | 68 | 62 | 194 | 176
Operating income (loss) | 9 | 14 | 20 | 39
Corporate Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenues | 0 | 46 | 56 | 143
Transaction-based expenses | 0 | 0 | 0 | 0
Revenues less transaction-based expenses | 0 | 46 | 56 | 143
Operating income (loss) | $ (43) | $ (22) | $ (99) | $ (81)

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