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Equity - Schedule of share repurchases (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total number of shares purchased 0.3 2.8 5.3 5.4 8.8
Average price paid per share (in dollars per share)   $ 0.00 $ 0.00 $ 133.01 $ 98.05
Total cash utilized $ 26     $ 851  
Cash used to repurchase shares       846 $ 1,123
Stock Repurchases          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Cash used to repurchase shares       1,123  
Total SPGI Equity          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total cash utilized   $ 500 $ 750 $ 846 $ 1,097