Segment and Related Information - Operating Results by Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenue	$ 2,861	$ 2,087	$ 8,244	$ 6,209
Operating Profit	853	1,083	4,228	3,317
Equity in income on unconsolidated subsidiaries	6	0	21	0
Gain (loss) on dispositions	(2)	3	1,897	5
Amortization of intangibles from acquisitions	267	21	645	74
Lease impairment	73		98
Services transferred at a point in time
Segment Reporting Information [Line Items]
Revenue	388	566	1,394	1,794
Services transferred over time
Segment Reporting Information [Line Items]
Revenue	2,473	1,521	6,850	4,415
IHS Markit
Segment Reporting Information [Line Items]
Acquisition-related costs	144	54	523	153
Operating Segments
Segment Reporting Information [Line Items]
Operating Profit	1,022	1,172	5,059	3,579
Operating Segments | Market Intelligence
Segment Reporting Information [Line Items]
Revenue	1,016	554	2,774	1,617
Operating Profit	174	179	2,366	514
Gain (loss) on dispositions	(17)		1,800	2
Employee severance charges	13		44
Acquisition-related costs	1		2
Amortization of intangibles from acquisitions	134	16	331	49
Operating Segments | Market Intelligence | Services transferred at a point in time
Segment Reporting Information [Line Items]
Revenue	40	13	111	39
Operating Segments | Market Intelligence | Services transferred over time
Segment Reporting Information [Line Items]
Revenue	976	541	2,663	1,578
Operating Segments | Market Intelligence | IHS Markit
Segment Reporting Information [Line Items]
Acquisition-related costs	6		21
Operating Segments | Ratings
Segment Reporting Information [Line Items]
Revenue	681	1,017	2,345	3,107
Operating Profit	377	644	1,352	2,054
Employee severance charges	2		14
Amortization of intangibles from acquisitions	2		5	8
Operating Segments | Ratings | Services transferred at a point in time
Segment Reporting Information [Line Items]
Revenue	244	551	992	1,748
Operating Segments | Ratings | Services transferred over time
Segment Reporting Information [Line Items]
Revenue	437	466	1,353	1,359
Operating Segments | Commodity Insights
Segment Reporting Information [Line Items]
Revenue	432	255	1,234	747
Operating Profit	141	136	440	411
Employee severance charges	14		38
Amortization of intangibles from acquisitions	32	2	77	6
Operating Segments | Commodity Insights | Services transferred at a point in time
Segment Reporting Information [Line Items]
Revenue	21	2	96	7
Operating Segments | Commodity Insights | Services transferred over time
Segment Reporting Information [Line Items]
Revenue	411	253	1,138	740
Operating Segments | Commodity Insights | IHS Markit
Segment Reporting Information [Line Items]
Acquisition-related costs	10		16
Operating Segments | Mobility
Segment Reporting Information [Line Items]
Revenue	346	0	797	0
Operating Profit	90	0	166	0
Employee severance charges	1		3
Acquisition-related costs			15
Amortization of intangibles from acquisitions	76		176
Gain on acquisition	19
Operating Segments | Mobility | Services transferred at a point in time
Segment Reporting Information [Line Items]
Revenue	77	0	179	0
Operating Segments | Mobility | Services transferred over time
Segment Reporting Information [Line Items]
Revenue	269	0	618	0
Operating Segments | Mobility | IHS Markit
Segment Reporting Information [Line Items]
Acquisition-related costs			1
Operating Segments | Indices
Segment Reporting Information [Line Items]
Revenue	334	298	995	846
Operating Profit	239	213	732	600
Gain (loss) on dispositions	14		52
Employee severance charges	1		4
Amortization of intangibles from acquisitions	9	1	22	4
Operating Segments | Indices | Services transferred at a point in time
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Operating Segments | Indices | Services transferred over time
Segment Reporting Information [Line Items]
Revenue	334	298	995	846
Operating Segments | Indices | IHS Markit
Segment Reporting Information [Line Items]
Acquisition-related costs	1		1
Operating Segments | Engineering Solutions
Segment Reporting Information [Line Items]
Revenue	95	0	224	0
Operating Profit	1	0	3	0
Employee severance charges	2		4
Amortization of intangibles from acquisitions	14		33
Operating Segments | Engineering Solutions | Services transferred at a point in time
Segment Reporting Information [Line Items]
Revenue	6	0	16	0
Operating Segments | Engineering Solutions | Services transferred over time
Segment Reporting Information [Line Items]
Revenue	89	0	208	0
Intersegment Elimination
Segment Reporting Information [Line Items]
Revenue	(43)	(37)	(125)	(108)
Intersegment Elimination | Services transferred at a point in time
Segment Reporting Information [Line Items]
Revenue	0	0	0	0
Intersegment Elimination | Services transferred over time
Segment Reporting Information [Line Items]
Revenue	(43)	(37)	(125)	(108)
Corporate Unallocated
Segment Reporting Information [Line Items]
Operating Profit	(175)	(89)	(852)	(262)
Equity in income on unconsolidated subsidiaries	6	0	21	0
Employee severance charges	23		87
Acquisition-related costs	1		7
Gain on acquisition	10		10
Asset impairments and write-offs	9		9
S&P Foundation grant			200
Lease impairment			5
Asset write-off			3
Retention related expenses				2
Amortization of intangibles from acquisitions	13		42
Corporate Unallocated | IHS Markit
Segment Reporting Information [Line Items]
Gain (loss) on dispositions		3		3
Acquisition-related costs	$ 127	$ 54	483	153
Amortization of intangibles from acquisitions			$ 1	7
Lease impairment				$ 3