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Equity - Share Repurchases (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total number of shares purchased 0.7 2.8 5.7 5.4
Average price paid per share (USD per share) $ 205.11 $ 0.00 $ 180.94 $ 133.01
Total cash utilized     $ 1,113  
Payments for Repurchase of Common Stock $ 6   1,108 $ 846
Total SPGI Equity        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total cash utilized $ 13 $ 500 $ 1,113 $ 846