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Business Segments (Schedule of Operating Segments) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Total revenues $ 964 $ 965 $ 3,141 $ 2,929
Transaction-based expenses (364) (362) (1,259) (1,149)
Revenues less transaction-based expenses 600 603 1,882 1,780
Operating income (loss) 246 262 787 750
Operating Segments | Market Services        
Segment Reporting Information [Line Items]        
Total revenues 586 581 1,968 1,808
Transaction-based expenses (364) (362) (1,259) (1,149)
Revenues less transaction-based expenses 222 219 709 659
Operating income (loss) 121 118 402 359
Operating Segments | Corporate Services        
Segment Reporting Information [Line Items]        
Total revenues 131 126 395 370
Transaction-based expenses 0 0 0 0
Revenues less transaction-based expenses 131 126 395 370
Operating income (loss) 42 41 122 115
Operating Segments | Information Services        
Segment Reporting Information [Line Items]        
Total revenues 179 150 528 432
Transaction-based expenses 0 0 0 0
Revenues less transaction-based expenses 179 150 528 432
Operating income (loss) 117 111 342 318
Operating Segments | Market Technology        
Segment Reporting Information [Line Items]        
Total revenues 68 62 194 176
Transaction-based expenses 0 0 0 0
Revenues less transaction-based expenses 68 62 194 176
Operating income (loss) 9 14 20 39
Corporate Items        
Segment Reporting Information [Line Items]        
Total revenues 0 46 56 143
Transaction-based expenses 0 0 0 0
Revenues less transaction-based expenses 0 46 56 143
Operating income (loss) $ (43) $ (22) $ (99) $ (81)