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Nature of Operations and Basis of Presentation (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2016
business
Sep. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Segment
Sep. 30, 2015
USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]            
Number of reportable segments (in segments) | Segment         4  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Pre-tax gain on sale of business     $ 722 $ 0 $ 722 $ 11
S&P Global Platts            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Pre-tax gain on sale of business     722   722  
J.D. Power | S&P Global Platts | Disposal Group, Disposed of by Sale, Not Discontinued Operations            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Proceeds from sale of business   $ 1,100        
Pre-tax gain on sale of business     722   722  
After-tax gain on sale of business     $ 521   $ 521  
Subsequent Event | SPSE and CMA | S&P Global Market Intelligence | Disposal Group, Disposed of by Sale, Not Discontinued Operations            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Number of businesses sold | business 2