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Business Segments (Schedule of Operating 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
Transaction-based expenses |  |  |  |  |  |  |  |  | (1,428) | (1,313) | (1,433)
Revenues less transaction-based expenses |  |  |  |  |  |  |  |  | 2,277 | 2,090 | 2,067
Depreciation And Amortization |  |  |  |  |  |  |  |  | 170 | 138 | 137
Operating income (loss) |  |  |  |  |  |  |  |  | 839 | 720 | 754
Total assets | $ 14,150 |  |  |  | $ 11,861 |  |  |  | 14,150 | 11,861 | 12,071
Purchases of property and equipment |  |  |  |  |  |  |  |  | 134 | 133 | 140
Corporate Items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | (221) | (256) | (177)
Total assets | 1,263 |  |  |  | 1,171 |  |  |  | 1,263 | 1,171 | 992
Market Services | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 2,255 | 2,084 | 2,229
Transaction-based expenses |  |  |  |  |  |  |  |  | (1,428) | (1,313) | (1,433)
Revenues less transaction-based expenses |  |  |  |  |  |  |  |  | 827 | 771 | 796
Depreciation And Amortization |  |  |  |  |  |  |  |  | 87 | 64 | 80
Operating income (loss) |  |  |  |  |  |  |  |  | 450 | 413 | 413
Total assets | 8,626 |  |  |  | 6,906 |  |  |  | 8,626 | 6,906 | 7,437
Purchases of property and equipment |  |  |  |  |  |  |  |  | 62 | 53 | 50
Corporate Services | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | 167 | $ 162 | $ 162 | $ 143 | 143 | $ 138 | $ 142 | $ 139 | 635 | 562 | 552
Transaction-based expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Revenues less transaction-based expenses |  |  |  |  |  |  |  |  | 635 | 562 | 552
Depreciation And Amortization |  |  |  |  |  |  |  |  | 47 | 42 | 25
Operating income (loss) | 41 | 42 | 41 | 34 | 36 | 36 | 37 | 32 | 158 | 140 | 121
Total assets | 1,263 |  |  |  | 576 |  |  |  | 1,263 | 576 | 747
Purchases of property and equipment |  |  |  |  |  |  |  |  | 37 | 38 | 43
Information Services | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 540 | 512 | 473
Transaction-based expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Revenues less transaction-based expenses |  |  |  |  |  |  |  |  | 540 | 512 | 473
Depreciation And Amortization |  |  |  |  |  |  |  |  | 18 | 14 | 13
Operating income (loss) |  |  |  |  |  |  |  |  | 383 | 365 | 348
Total assets | 2,439 |  |  |  | 2,456 |  |  |  | 2,439 | 2,456 | 2,296
Purchases of property and equipment |  |  |  |  |  |  |  |  | 8 | 11 | 12
Market Technology | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | 77 | 73 | 69 | 57 | 71 | 59 | 59 | 55 | 275 | 245 | 246
Transaction-based expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Revenues less transaction-based expenses |  |  |  |  |  |  |  |  | 275 | 245 | 246
Depreciation And Amortization |  |  |  |  |  |  |  |  | 18 | 18 | 19
Operating income (loss) | 23 | $ 19 | $ 17 | $ 10 | 23 | $ 12 | $ 11 | $ 10 | 69 | 58 | 49
Total assets | $ 559 |  |  |  | $ 752 |  |  |  | 559 | 752 | 599
Purchases of property and equipment |  |  |  |  |  |  |  |  | $ 27 | $ 31 | $ 35

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