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Acquisitions and Divestitures - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 28, 2022
Mar. 31, 2022
Mar. 31, 2021
Business Acquisition [Line Items]      
Pre-tax gain on sale   $ 1,344 $ 2
Sale | CUSIP Global Services      
Business Acquisition [Line Items]      
Sale of business in cash   1,925  
Pre-tax gain on sale   1,344  
Gain on disposition after tax   999  
Sale | OPIS      
Business Acquisition [Line Items]      
Sale of business in cash $ 1,150    
Sale | SPIAS      
Business Acquisition [Line Items]      
Pre-tax gain on sale   1,300 2
Gain on disposition after tax     2
IHS Markit      
Business Acquisition [Line Items]      
Percentage of voting interests acquired (as a percent) 100.00%    
Number of S&P Global common stock transferred to IHS Markit stockholders (shares) 113,800,453    
Exchange ratio 28.38%    
Goodwill expected to be deductible for tax purposes $ 699    
Acquisition-related costs   230 $ 49
Results of operations since acquisition date   432  
Operating profit since acquisition date   $ 55  
IHS Markit | Replacement Equity Awards      
Business Acquisition [Line Items]      
Number of S&P Global common stock transferred to IHS Markit stockholders (shares) 900,000