Consolidated Statements of Equity - USD ($) $ in Millions		Total	Total SPGI Equity	Common Stock $1 par	Additional Paid-in Capital	Retained Income	Accumulated Other Comprehensive Loss	Less: Treasury Stock	Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, par value (USD per share)		$ 1
Beginning balance at Dec. 31, 2023		$ 34,300	$ 34,200	$ 415	$ 44,231	$ 18,728	$ (763)	$ (28,411)	$ 100
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	[1]	1,940	1,926			2,002	(76)		14
Dividends (Dividend declared per common share)		(583)	(572)			(572)			(11)
Share repurchases, including excise tax		(505)	(505)		195			700
Employee stock plans		33	33		(19)			(52)
Change in redemption value of redeemable noncontrolling interests		(203)	(203)			(203)
Other		(12)	2			2			(14)
Ending balance at Jun. 30, 2024		$ 34,970	34,881	415	44,407	19,957	(839)	(29,059)	89
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, par value (USD per share)		$ 1
Beginning balance at Mar. 31, 2024		$ 34,424	34,327	415	44,295	19,433	(825)	(28,991)	97
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	[1]	1,004	998			1,011	(13)		6
Dividends (Dividend declared per common share)		(297)	(286)			(286)			(11)
Share repurchases, including excise tax		(1)	(1)		75			76
Employee stock plans		45	45		37			(8)
Change in redemption value of redeemable noncontrolling interests		(202)	(202)			(202)
Other		(3)	0			1	(1)		(3)
Ending balance at Jun. 30, 2024		$ 34,970	34,881	415	44,407	19,957	(839)	(29,059)	89
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, par value (USD per share)		$ 1
Common stock, par value (USD per share)		$ 1
Beginning balance at Dec. 31, 2024		$ 33,256	33,159	415	44,321	20,977	(883)	(31,671)	97
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	[1]	2,266	2,249			2,161	88		17
Dividends (Dividend declared per common share)		(599)	(589)			(589)			(10)
Share repurchases, including excise tax		(1,314)	(1,314)		65			1,379
Employee stock plans		32	32		6			(26)
Change in redemption value of redeemable noncontrolling interests		(147)	(147)			(147)
Other		2	0						2
Ending balance at Jun. 30, 2025		$ 33,496	33,390	415	44,392	22,402	(795)	(33,024)	106
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, par value (USD per share)		$ 1
Beginning balance at Mar. 31, 2025		$ 33,473	33,371	415	44,359	21,799	(826)	(32,376)	102
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	[1]	1,116	1,103			1,072	31		13
Dividends (Dividend declared per common share)		(303)	(293)			(293)			(10)
Share repurchases, including excise tax		(657)	(657)					657
Employee stock plans		42	42		33			(9)
Change in redemption value of redeemable noncontrolling interests		(176)	(176)			(176)
Other		1	0						1
Ending balance at Jun. 30, 2025		$ 33,496	$ 33,390	$ 415	$ 44,392	$ 22,402	$ (795)	$ (33,024)	$ 106
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock, par value (USD per share)		$ 1

[1] 1Excludes comprehensive income of $76 million and $68 million for the three months ended June 30, 2025 and 2024, respectively, and $153 million and $138 million for the six months ended June 30, 2025 and 2024, respectively, attributable to our redeemable noncontrolling interests.