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Segment Information - Financial Information by Segment (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Segment Reporting Information, Operating Income (Loss) [Abstract]    
Revenue $ 1,290 $ 1,142
Total Expense 698 680
Operating income 592 462
Restructuring (1) 6
Depreciation and amortization 49 50
Acquisition-Related Expenses 0 1
Loss pursuant to the divestiture of MAKS 9 0
Adjusted Operating Income 649 519
Eliminations    
Segment Reporting Information, Operating Income (Loss) [Abstract]    
Revenue (39) (34)
Total Expense (39) (34)
Operating income 0 0
Restructuring 0 0
Depreciation and amortization 0 0
Acquisition-Related Expenses 0 0
Loss pursuant to the divestiture of MAKS 0 0
Adjusted Operating Income 0 0
MIS    
Segment Reporting Information, Operating Income (Loss) [Abstract]    
Revenue 794 670
MIS | Operating Segments    
Segment Reporting Information, Operating Income (Loss) [Abstract]    
Revenue 831 702
Total Expense 343 336
Operating income 488 366
Restructuring (1) 3
Depreciation and amortization 16 17
Acquisition-Related Expenses 0 0
Loss pursuant to the divestiture of MAKS 0 0
Adjusted Operating Income 503 386
MA    
Segment Reporting Information, Operating Income (Loss) [Abstract]    
Revenue 496 472
MA | Operating Segments    
Segment Reporting Information, Operating Income (Loss) [Abstract]    
Revenue 498 474
Total Expense 394 378
Operating income 104 96
Restructuring 0 3
Depreciation and amortization 33 33
Acquisition-Related Expenses 0 1
Loss pursuant to the divestiture of MAKS 9 0
Adjusted Operating Income $ 146 $ 133