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Earnings per Share - Summary (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Amount attributable to S&P Global Inc. common shareholders:                      
Net income $ 512 $ 495 $ 461 $ 491 $ 263 $ 414 $ 421 $ 399 $ 1,958 $ 1,496 $ 2,106
Basic weighted-average number of common shares outstanding (shares)                 250,900,000 256,300,000 262,800,000
Effect of stock options and other dilutive securities (shares)                 2,300,000 2,600,000 2,400,000
Diluted weighted-average number of common shares outstanding (shares)                 253,200,000 258,900,000 265,200,000
Net income:                      
Basic (USD per share) $ 2.06 $ 1.97 $ 1.83 $ 1.94 $ 1.03 $ 1.62 $ 1.63 $ 1.54 $ 7.80 $ 5.84 $ 8.02
Diluted (USD per share) $ 2.03 $ 1.95 $ 1.82 $ 1.93 $ 1.02 $ 1.61 $ 1.62 $ 1.53 $ 7.73 $ 5.78 $ 7.94
Employee Stock Option                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Outstanding shares not included in the computation of diluted earnings per share for both restricted stock and stock options (shares)                 0 0 0
Restricted Stock                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Outstanding shares not included in the computation of diluted earnings per share for both restricted stock and stock options (shares)                 500,000 600,000 700,000