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Acquisitions and Divestitures - Narrative (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Aug. 31, 2017
Jun. 30, 2017
Apr. 30, 2017
Jun. 30, 2016
Schedule of Equity Method Investments And Cost-Method Investments [Line Items]          
Assets held for sale       $ 5  
Algomi Limited          
Schedule of Equity Method Investments And Cost-Method Investments [Line Items]          
Fair value method investment, ownership (as a percent)   6.02%      
CARE Ratings Limited          
Schedule of Equity Method Investments And Cost-Method Investments [Line Items]          
Fair value method investment, ownership (as a percent)     8.90%    
CARE Ratings Limited | Other Noncurrent Assets          
Schedule of Equity Method Investments And Cost-Method Investments [Line Items]          
Investment balance $ 53        
TRIS Rating Company Limited          
Schedule of Equity Method Investments And Cost-Method Investments [Line Items]          
Equity method investment, ownership (as a percent)         49.00%