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Acquisitions and Divestitures - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2022
Jun. 30, 2022
Feb. 28, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Mar. 31, 2022
Business Acquisition [Line Items]                
Pre-tax gain (loss) on sale       $ (2,000,000) $ 3,000,000 $ 1,897,000,000 $ 5,000,000  
Sale | LCD and Leveraged Loan Indices                
Business Acquisition [Line Items]                
Sale of business in cash   $ 600,000,000            
Contingent payment   50,000,000            
Sale | LCD                
Business Acquisition [Line Items]                
Pre-tax gain (loss) on sale       (15,000,000)   505,000,000    
Gain (loss) on disposition after tax       (11,000,000)   378,000,000    
Sale | Leveraged Loan Indices                
Business Acquisition [Line Items]                
Pre-tax gain (loss) on sale       14,000,000   52,000,000    
Gain (loss) on disposition after tax       12,000,000   43,000,000    
Sale | Base Chemicals                
Business Acquisition [Line Items]                
Sale of business in cash   $ 295,000,000            
Sale | CUSIP Global Services                
Business Acquisition [Line Items]                
Sale of business in cash               $ 1,925,000,000
Pre-tax gain (loss) on sale       (2,000,000)   1,341,000,000    
Gain (loss) on disposition after tax       (2,000,000)   1,005,000,000.000    
Sale | OPIS                
Business Acquisition [Line Items]                
Sale of business in cash $ 1,150,000,000   $ 1,150,000,000          
Pre-tax gain (loss) on sale     $ 0          
Sale | Office Facility                
Business Acquisition [Line Items]                
Pre-tax gain (loss) on sale         3,000,000   3,000,000  
Gain (loss) on disposition after tax         2,000,000   2,000,000  
Sale | SPIAS                
Business Acquisition [Line Items]                
Pre-tax gain (loss) on sale             2,000,000  
Gain (loss) on disposition after tax             2,000,000  
IHS Markit                
Business Acquisition [Line Items]                
Percentage of voting interests acquired 100.00%   100.00%          
Number of S&P Global common stock transferred to IHS Markit stockholders (shares) 113,800,453              
Exchange ratio 28.38%              
Fair value of the consideration transferred for IHS Markit $ 43,536,000,000   $ 43,536,000,000          
Goodwill expected to be deductible for tax purposes $ 699,000,000   699,000,000          
Acquisition-related costs       144,000,000 $ 54,000,000 523,000,000 $ 153,000,000  
Results of operations since acquisition date       1,114,000,000   2,662,000,000    
Operating profit since acquisition date       $ 207,000,000   $ 457,000,000    
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 the consideration transferred for IHS Markit $ 191,000,000   $ 191,000,000