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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Indefinite-lived Intangible Assets by Major Class [Line Items]      
Other intangible assets $ 846 $ 714  
Weighted-average life of the intangible assets 11 years    
Amortization of intangibles $ 122 98 $ 96
Intellectual Property      
Indefinite-lived Intangible Assets by Major Class [Line Items]      
Carrying value of trade name and licenses 380 380  
Tradenames      
Indefinite-lived Intangible Assets by Major Class [Line Items]      
Carrying value of trade name and licenses $ 90 90  
Maximum      
Indefinite-lived Intangible Assets by Major Class [Line Items]      
Weighted-average life of the intangible assets 20 years    
Market Intelligence      
Indefinite-lived Intangible Assets by Major Class [Line Items]      
Amortization of intangibles $ 73 71 72
Market Intelligence | Tradenames      
Indefinite-lived Intangible Assets by Major Class [Line Items]      
Carrying value of trade name and licenses 185 185  
Indices      
Indefinite-lived Intangible Assets by Major Class [Line Items]      
Amortization of intangibles 6 6 $ 6
Indices | Intellectual Property      
Indefinite-lived Intangible Assets by Major Class [Line Items]      
Carrying value of trade name and licenses 132    
Indices | Goldman Sachs Commodity and Broad Market Intellectual Property      
Indefinite-lived Intangible Assets by Major Class [Line Items]      
Carrying value of trade name and licenses $ 59 $ 59