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Business Segments (Schedule of Operating Segments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Total revenues $ 4,277 $ 3,948 $ 3,704
Transaction-based expenses (1,751) (1,537) (1,428)
Revenues less transaction-based expenses 2,526 2,411 2,276
Depreciation and amortization 210 188 170
Operating income (loss) 1,028 991 836
Total assets 15,700 15,354 13,411
Purchase of property and equipment 111 144 134
Operating Segments | Market Services      
Segment Reporting Information [Line Items]      
Total revenues 2,709 2,418 2,255
Transaction-based expenses (1,751) (1,537) (1,428)
Revenues less transaction-based expenses 958 881 827
Depreciation and amortization 95 95 87
Operating income (loss) 544 481 450
Total assets 10,299 9,471 8,626
Purchase of property and equipment 28 59 62
Operating Segments | Corporate Services      
Segment Reporting Information [Line Items]      
Total revenues 528 501 477
Transaction-based expenses 0 0 0
Revenues less transaction-based expenses 528 501 477
Depreciation and amortization 41 44 42
Operating income (loss) 163 158 130
Total assets 734 865 1,263
Purchase of property and equipment 29 41 37
Operating Segments | Information Services      
Segment Reporting Information [Line Items]      
Total revenues 714 588 540
Transaction-based expenses 0 0 0
Revenues less transaction-based expenses 714 588 540
Depreciation and amortization 51 26 18
Operating income (loss) 460 418 383
Total assets 3,352 3,420 2,439
Purchase of property and equipment 17 10 8
Operating Segments | Market Technology      
Segment Reporting Information [Line Items]      
Total revenues 270 247 241
Transaction-based expenses 0 0 0
Revenues less transaction-based expenses 270 247 241
Depreciation and amortization 21 14 13
Operating income (loss) 34 57 73
Total assets 467 572 497
Purchase of property and equipment 37 34 27
Corporate Items      
Segment Reporting Information [Line Items]      
Total revenues 56 194 191
Transaction-based expenses 0 0 0
Revenues less transaction-based expenses 56 194 191
Depreciation and amortization 2 9 10
Operating income (loss) (173) (123) (200)
Total assets 848 1,026 586
Purchase of property and equipment $ 0 $ 0 $ 0