Segment and Geographic Information - Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenue	$ 8,297	$ 7,442	$ 6,699
Depreciation & Amortization	178	206	204
Capital Expenditures	35	76	115
Total Assets	15,026	12,537
Held for sale
Disaggregation of Revenue [Line Items]
Total Assets	321	0
Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	2,322	2,031	1,625
Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	5,975	5,411	5,074
Subscription
Disaggregation of Revenue [Line Items]
Total revenue	3,253	3,036	2,843
Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Total revenue	2,322	2,031	1,625
Non-transaction
Disaggregation of Revenue [Line Items]
Total revenue	1,698	1,500	1,408
Asset-linked fees
Disaggregation of Revenue [Line Items]
Total revenue	800	648	623
Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Total revenue	224	227	200
Operating Segments
Disaggregation of Revenue [Line Items]
Depreciation & Amortization	159	167	162
Capital Expenditures	34	72	103
Total Assets	7,008	7,206
Operating Segments | Ratings
Disaggregation of Revenue [Line Items]
Total revenue	4,097	3,606	3,106
Depreciation & Amortization	46	40	34
Capital Expenditures	18	33	41
Total Assets	1,248	1,088
Operating Segments | Ratings | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	2,253	1,969	1,570
Operating Segments | Ratings | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	1,844	1,637	1,536
Operating Segments | Ratings | Subscription
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Operating Segments | Ratings | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Total revenue	2,253	1,969	1,570
Operating Segments | Ratings | Non-subscription / Transaction | Reclassification
Disaggregation of Revenue [Line Items]
Total revenue		(8)	(7)
Operating Segments | Ratings | Non-transaction
Disaggregation of Revenue [Line Items]
Total revenue	1,844	1,637	1,536
Operating Segments | Ratings | Non-transaction | Reclassification
Disaggregation of Revenue [Line Items]
Total revenue		8	7
Operating Segments | Ratings | Asset-linked fees
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Operating Segments | Ratings | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Operating Segments | Market Intelligence
Disaggregation of Revenue [Line Items]
Total revenue	2,247	2,106	1,959
Depreciation & Amortization	91	101	99
Capital Expenditures	12	28	44
Total Assets	3,368	3,762
Operating Segments | Market Intelligence | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	56	55	45
Operating Segments | Market Intelligence | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	2,191	2,051	1,914
Operating Segments | Market Intelligence | Subscription
Disaggregation of Revenue [Line Items]
Total revenue	2,191	2,050	1,904
Operating Segments | Market Intelligence | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Total revenue	56	55	45
Operating Segments | Market Intelligence | Non-transaction
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Operating Segments | Market Intelligence | Asset-linked fees
Disaggregation of Revenue [Line Items]
Total revenue	0	1	10
Operating Segments | Market Intelligence | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Operating Segments | Platts
Disaggregation of Revenue [Line Items]
Total revenue	950	878	844
Depreciation & Amortization	12	17	21
Capital Expenditures	2	7	13
Total Assets	891	913
Operating Segments | Platts | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	13	7	10
Operating Segments | Platts | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	937	871	834
Operating Segments | Platts | Subscription
Disaggregation of Revenue [Line Items]
Total revenue	871	809	774
Operating Segments | Platts | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Total revenue	13	7	10
Operating Segments | Platts | Non-transaction
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Operating Segments | Platts | Asset-linked fees
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Operating Segments | Platts | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Total revenue	66	62	60
Operating Segments | Indices
Disaggregation of Revenue [Line Items]
Total revenue	1,149	989	918
Depreciation & Amortization	10	9	8
Capital Expenditures	2	4	5
Total Assets	1,501	1,443
Operating Segments | Indices | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Operating Segments | Indices | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	1,149	989	918
Operating Segments | Indices | Subscription
Disaggregation of Revenue [Line Items]
Total revenue	191	177	165
Operating Segments | Indices | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Operating Segments | Indices | Non-transaction
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Operating Segments | Indices | Asset-linked fees
Disaggregation of Revenue [Line Items]
Total revenue	800	647	613
Operating Segments | Indices | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Total revenue	158	165	140
Corporate
Disaggregation of Revenue [Line Items]
Depreciation & Amortization	19	39	42
Capital Expenditures	1	4	12
Total Assets	7,697	5,331
Elimination
Disaggregation of Revenue [Line Items]
Total revenue	(146)	(137)	(128)
Elimination | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Elimination | Services transferred over time
Disaggregation of Revenue [Line Items]
Total revenue	(146)	(137)	(128)
Elimination | Subscription
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Elimination | Non-subscription / Transaction
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Elimination | Non-transaction
Disaggregation of Revenue [Line Items]
Total revenue	(146)	(137)	(128)
Elimination | Asset-linked fees
Disaggregation of Revenue [Line Items]
Total revenue	0	0	0
Elimination | Sales usage-based royalties
Disaggregation of Revenue [Line Items]
Total revenue	$ 0	$ 0	$ 0