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Nature of Operations and Basis of Presentation - Revenue Disaggregated by Revenue Type (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax $ 1,546 $ 1,513 $ 4,721 $ 4,475
Corporate        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 5 0 10 0
Intersegment Elimination        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax (32) (28) (92) (81)
Ratings | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 700 739 2,223 2,199
Market Intelligence | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 464 422 1,349 1,238
Platts | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 204 193 604 577
Indices | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 205 187 627 542
Subscription        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 685 619 1,981 1,816
Subscription | Corporate        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 5 0 10 0
Subscription | Intersegment Elimination        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Subscription | Ratings | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Subscription | Market Intelligence | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 451 406 1,306 1,189
Subscription | Platts | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 188 177 556 523
Subscription | Indices | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 41 36 109 104
Non-transaction        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 340 339 1,037 980
Non-transaction | Corporate        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Non-transaction | Intersegment Elimination        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax (32) (28) (92) (81)
Non-transaction | Ratings | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 372 367 1,129 1,061
Non-transaction | Market Intelligence | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Non-transaction | Platts | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Non-transaction | Indices | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Non-subscription / Transaction        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 338 384 1,130 1,179
Non-subscription / Transaction | Corporate        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Non-subscription / Transaction | Intersegment Elimination        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Non-subscription / Transaction | Ratings | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 328 372 1,094 1,138
Non-subscription / Transaction | Market Intelligence | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 8 10 28 32
Non-subscription / Transaction | Platts | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 2 2 8 9
Non-subscription / Transaction | Indices | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Asset-linked fees        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 136 124 411 357
Asset-linked fees | Corporate        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Asset-linked fees | Intersegment Elimination        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Asset-linked fees | Ratings | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Asset-linked fees | Market Intelligence | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 5 6 15 17
Asset-linked fees | Platts | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Asset-linked fees | Indices | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 131 118 396 340
Sales usage-based royalties        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 47 47 162 143
Sales usage-based royalties | Corporate        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Sales usage-based royalties | Intersegment Elimination        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Sales usage-based royalties | Ratings | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Sales usage-based royalties | Market Intelligence | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Sales usage-based royalties | Platts | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 14 14 40 45
Sales usage-based royalties | Indices | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 33 33 122 98
Transferred at Point in Time        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 338 384 1,130 1,179
Transferred at Point in Time | Corporate        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Transferred at Point in Time | Intersegment Elimination        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Transferred at Point in Time | Ratings | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 328 372 1,094 1,138
Transferred at Point in Time | Market Intelligence | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 8 10 28 32
Transferred at Point in Time | Platts | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 2 2 8 9
Transferred at Point in Time | Indices | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 0 0 0 0
Transferred over Time        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 1,208 1,129 3,591 3,296
Transferred over Time | Corporate        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 5 0 10 0
Transferred over Time | Intersegment Elimination        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax (32) (28) (92) (81)
Transferred over Time | Ratings | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 372 367 1,129 1,061
Transferred over Time | Market Intelligence | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 456 412 1,321 1,206
Transferred over Time | Platts | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax 202 191 596 568
Transferred over Time | Indices | Operating Segments        
Segment Reporting Information [Line Items]        
Revenue from contract with customer, excluding assessed tax $ 205 $ 187 $ 627 $ 542