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Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Goodwill, beginning balance $ 2,989 $ 2,949
Acquisitions 565  
Other (19) 40
Goodwill, ending balance 3,535 2,989
Operating Segments | Ratings    
Goodwill [Roll Forward]    
Goodwill, beginning balance 114 109
Acquisitions 5  
Other (6) 5
Goodwill, ending balance 113 114
Operating Segments | Market Intelligence    
Goodwill [Roll Forward]    
Goodwill, beginning balance 1,961 1,960
Acquisitions 62  
Other 6 1
Goodwill, ending balance 2,029 1,961
Operating Segments | Platts    
Goodwill [Roll Forward]    
Goodwill, beginning balance 523 497
Acquisitions 0  
Other (7) 26
Goodwill, ending balance 516 523
Operating Segments | Indices    
Goodwill [Roll Forward]    
Goodwill, beginning balance 391 383
Acquisitions 0  
Other (12) 8
Goodwill, ending balance 379 391
Corporate    
Goodwill [Roll Forward]    
Goodwill, beginning balance 0 0
Acquisitions 498  
Other 0 0
Goodwill, ending balance $ 498 $ 0