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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