Acquisitions and Divestitures - Merger with IHS Markit (Details) - USD ($) $ / shares in Units, $ in Millions	Feb. 28, 2022	Jun. 30, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Closing price per share of S&P Global common stock (USD per share)	$ 380.89
Goodwill		$ 34,444	$ 3,506
IHS Markit
Business Acquisition [Line Items]
Exchange ratio	28.38%
Number of S&P Global common stock transferred to IHS Markit stockholders (shares)	113,800,453
Fair value of S&P Global common stock and replacement equity awards	$ 43,536
Goodwill	30,986
Other intangible assets	19,162
IHS Markit | Common Stock $1 par
Business Acquisition [Line Items]
Fair value of S&P Global common stock and replacement equity awards	$ 43,345
IHS Markit | Replacement Equity Awards
Business Acquisition [Line Items]
Number of S&P Global common stock transferred to IHS Markit stockholders (shares)	900,000
Fair value of S&P Global common stock and replacement equity awards	$ 191
IHS Markit
Business Acquisition [Line Items]
Actual shares outstanding at period end (shares)	400,988,207
IHS Markit | IHS Markit | EBT
Business Acquisition [Line Items]
Actual shares outstanding at period end (shares)	25,219,470