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Business Segments (Corporate Services and Market Technology Segments) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 3,705 | $ 3,403 | $ 3,500
Operating Income |  |  |  |  |  |  |  |  | 839 | 720 | 754
Operating Segments | Corporate Services |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 167 | $ 162 | $ 162 | $ 143 | $ 143 | $ 138 | $ 142 | $ 139 | 635 | 562 | 552
Operating Income | 41 | 42 | 41 | 34 | 36 | 36 | 37 | 32 | 158 | 140 | 121
Operating Segments | Market Technology |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | 77 | 73 | 69 | 57 | 71 | 59 | 59 | 55 | 275 | 245 | 246
Operating Income | $ 23 | $ 19 | $ 17 | $ 10 | $ 23 | $ 12 | $ 11 | $ 10 | $ 69 | $ 58 | $ 49

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