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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