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Acquisitions and Divestitures - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Apr. 30, 2017
Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]      
Assets held for sale   $ 5  
CARE Ratings Limited      
Schedule of Equity Method Investments [Line Items]      
Fair value method investment, ownership (as a percent) 8.90%    
TRIS Rating Company Limited      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership (as a percent)     49.00%
Other Noncurrent Assets | CARE Ratings Limited      
Schedule of Equity Method Investments [Line Items]      
Investment balance $ 65