Debt - Narrative (Details)		3 Months Ended		12 Months Ended
	Mar. 02, 2022 USD ($) note	Sep. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 12, 2023 USD ($)	Mar. 18, 2022 USD ($)	Feb. 28, 2022 USD ($)
Debt Instrument [Line Items]
Annual long term debt maturity year 2024				$ 47,000,000
Annual long term debt maturity year 2025				4,000,000
Annual long term debt maturity year 2026				3,000,000
Annual long term debt maturity year 2027				1,700,000,000
Annual long term debt maturity year 2028				810,000,000
Annual long term debt maturity thereafter				8,900,000,000
Fair value of our long-term debt borrowings				10,300,000,000	$ 9,300,000,000
Debt face amount					134,000,000
Loss on extinguishment of debt				0	8,000,000	$ 0
Repayments of debt					142,000,000
Commercial paper, at carrying value				$ 0	$ 188,000,000
Ratio of indebtedness to cash flow				4
IHS Markit Ltd
Debt Instrument [Line Items]
Long-term debt									$ 4,191,000,000
Debt instrument, redemption price, percentage of principal amount redeemed	96.00%
Debt conversion, original debt, amount	$ 4,500,000,000
Senior Notes
Debt Instrument [Line Items]
Debt instrument, fair value disclosure									292,000,000
Senior Notes | IHS Markit Ltd
Debt Instrument [Line Items]
Long-term debt, principal amount	4,600,000,000								4,600,000,000
Long-term debt									$ 4,900,000,000
Long-term debt, gross	$ 175,000,000
Debt instrument, series of senior notes, number | note	7
5.250% Senior Notes Due 2033 | Senior Notes
Debt Instrument [Line Items]
Debt face amount		$ 750,000,000					$ 750,000,000
Interest rate (as a percent)		5.25%					5.25%
5.0% Senior Notes, due 2022 | Senior Notes | IHS Markit Ltd
Debt Instrument [Line Items]
Interest rate (as a percent)									5.00%
Long-term debt, gross									$ 748,000,000
4.125% Senior Notes, due 2023 | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percent)		4.125%		4.125%
Repayments of debt		$ 38,000,000
4.125% Senior Notes, due 2023 | Senior Notes | IHS Markit Ltd
Debt Instrument [Line Items]
Interest rate (as a percent)									4.125%
Long-term debt, gross									$ 500,000,000
3.625% Senior Notes, due 2024 | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percent)				3.625%
3.625% Senior Notes, due 2024 | Senior Notes | IHS Markit Ltd
Debt Instrument [Line Items]
Interest rate (as a percent)									3.625%
Long-term debt, gross									$ 400,000,000
4.75% Senior Notes, due 2025 | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percent)				4.75%
4.75% Senior Notes, due 2025 | Senior Notes | IHS Markit Ltd
Debt Instrument [Line Items]
Interest rate (as a percent)									4.75%
Long-term debt, gross									$ 800,000,000
4.0% Senior Notes, due 2026 | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percent)				4.00%
4.0% Senior Notes, due 2026 | Senior Notes | IHS Markit Ltd
Debt Instrument [Line Items]
Interest rate (as a percent)									4.00%
Long-term debt, gross									$ 500,000,000
4.75% Senior Notes, due 2028 | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percent)				4.75%
4.75% Senior Notes, due 2028 | Senior Notes | IHS Markit Ltd
Debt Instrument [Line Items]
Interest rate (as a percent)									4.75%
Long-term debt, gross									$ 750,000,000
4.25% Senior Notes, due 2029 | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percent)				4.25%
4.25% Senior Notes, due 2029 | Senior Notes | IHS Markit Ltd
Debt Instrument [Line Items]
Interest rate (as a percent)									4.25%
Long-term debt, gross									$ 950,000,000
2.45% Senior Notes, due 2027 | Senior Notes
Debt Instrument [Line Items]
Debt face amount								$ 1,250,000,000
Interest rate (as a percent)				2.45%				2.45%
2.70% Sustainability-Linked Senior Notes, due 2029 | Senior Notes
Debt Instrument [Line Items]
Debt face amount								$ 1,250,000,000
Interest rate (as a percent)				2.70%				2.70%
2.90% Senior Notes, due 2032 | Senior Notes
Debt Instrument [Line Items]
Debt face amount								$ 1,500,000,000
Interest rate (as a percent)				2.90%				2.90%
3.7% Senior Notes, due 2052 | Senior Notes
Debt Instrument [Line Items]
Debt face amount								$ 1,000,000,000
Interest rate (as a percent)				3.70%				3.70%
3.9% Senior Notes, due 2062 | Senior Notes
Debt Instrument [Line Items]
Debt face amount								$ 500,000,000
Interest rate (as a percent)				3.90%				3.90%
Senior Notes 4.125% Due 2023 | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percent)								4.125%
Senior Notes 3.625% Due 2024 | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percent)								3.625%
Senior Notes 4.0% Due 2026 | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percent)								4.00%
Senior Notes 5.0% Due 2022 | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percent)			5.00%					5.00%
Extinguishment of debt, amount			$ 52,000,000
Senior Notes 4.750% Due 2025 | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percent)			4.75%					4.75%
Extinguishment of debt, amount			$ 247,000,000
4.0% Senior Notes, due 2025 | Senior Notes
Debt Instrument [Line Items]
Interest rate (as a percent)			4.00%					4.00%
Extinguishment of debt, amount			$ 287,000,000
Five-year Revolving Credit Facility | Commercial paper
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 2,000,000,000
Five-year Revolving Credit Facility | Revolving Credit Facility Due 2022
Debt Instrument [Line Items]
Credit facility term				5 years
Five-year Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Commitment fee ratio				0.08%