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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 |  |

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