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Significant Accounting Policies Update (Revenue by Product, Service and Segment) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | $ 600 | $ 603 | $ 1,882 | $ 1,780
Transaction-based trading and clearing, net |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 150 | 144 | 489 | 441
Trade management services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 72 | 75 | 220 | 218
Corporate solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 59 | 59 | 178 | 173
Listing services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 72 | 67 | 217 | 197
Market data products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 95 | 97 | 293 | 276
Index |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 52 | 43 | 152 | 125
Investment data & analytics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 32 | 10 | 83 | 31
Market technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 68 | 62 | 194 | 176
Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 46 | 56 | 143
Operating Segments | Market Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 222 | 219 | 709 | 659
Operating Segments | Corporate Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 131 | 126 | 395 | 370
Operating Segments | Information Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 179 | 150 | 528 | 432
Operating Segments | Market Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 68 | 62 | 194 | 176
Operating Segments | Transaction-based trading and clearing, net | Market Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 150 | 144 | 489 | 441
Operating Segments | Transaction-based trading and clearing, net | Corporate Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Transaction-based trading and clearing, net | Information Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Transaction-based trading and clearing, net | Market Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Trade management services | Market Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 72 | 75 | 220 | 218
Operating Segments | Trade management services | Corporate Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Trade management services | Information Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Trade management services | Market Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Corporate solutions | Market Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Corporate solutions | Corporate Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 59 | 59 | 178 | 173
Operating Segments | Corporate solutions | Information Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Corporate solutions | Market Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Listing services | Market Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Listing services | Corporate Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 72 | 67 | 217 | 197
Operating Segments | Listing services | Information Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Listing services | Market Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Market data products | Market Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Market data products | Corporate Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Market data products | Information Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 95 | 97 | 293 | 276
Operating Segments | Market data products | Market Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Index | Market Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Index | Corporate Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Index | Information Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 52 | 43 | 152 | 125
Operating Segments | Index | Market Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Investment data & analytics | Market Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Investment data & analytics | Corporate Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Investment data & analytics | Information Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 32 | 10 | 83 | 31
Operating Segments | Investment data & analytics | Market Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Market technology | Market Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Market technology | Corporate Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Market technology | Information Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Market technology | Market Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 68 | 62 | 194 | 176
Operating Segments | Other revenues | Market Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Other revenues | Corporate Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Other revenues | Information Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Operating Segments | Other revenues | Market Technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Segment Reconciling Items |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 46 | 56 | 143
Segment Reconciling Items | Transaction-based trading and clearing, net |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Segment Reconciling Items | Trade management services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Segment Reconciling Items | Corporate solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Segment Reconciling Items | Listing services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Segment Reconciling Items | Market data products |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Segment Reconciling Items | Index |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Segment Reconciling Items | Investment data & analytics |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Segment Reconciling Items | Market technology |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | 0 | 0 | 0 | 0
Segment Reconciling Items | Other revenues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues less transaction-based expenses | $ 0 | $ 46 | $ 56 | $ 143

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