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Equity (Schedule of stock 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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total number of shares purchased (in shares) 0.3 5.3 2.3 8.8 4.9
Average price paid per share (in dollars per share)   $ 0.00 $ 99.01 $ 98.05 $ 102.01
Total cash utilized $ 26     $ 1,097  
Cash used to repurchase shares       1,123 $ 501
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   $ 750 $ 227 $ 1,097 $ 501