Consolidated Statements of Equity (Unaudited) - 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
Beginning Balance at Dec. 31, 2020		$ 571		$ 509		$ 294	$ 946	$ 13,367		$ (637)	$ (13,461)	$ 62
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	[1]	2,253		2,236				2,349		(113)		17
Dividends (Dividend declared per common share)		(567)		(557)				(557)				(10)
Employee stock plans		44		44			55				11
Change in redemption value of redeemable noncontrolling interest		(387)		(387)				(387)
Other		1										1
Ending Balance at Sep. 30, 2021		$ 1,915		1,845		294	1,001	14,772		(750)	(13,472)	70
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (USD per share)		$ 2.31
Beginning Balance at Jun. 30, 2021		$ 1,331		1,265		294	963	14,237		(764)	(13,465)	66
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	[1]	817		811				797		14		6
Dividends (Dividend declared per common share)		(189)		(186)				(186)				(3)
Employee stock plans		31		31			38				7
Change in redemption value of redeemable noncontrolling interest		(76)		(76)				(76)
Other		1										1
Ending Balance at Sep. 30, 2021		$ 1,915		1,845		294	1,001	14,772		(750)	(13,472)	70
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (USD per share)		$ 0.77
Common stock, par value (USD per share)		1
Common stock, par value (USD per share)		$ 1
Beginning Balance at Dec. 31, 2021		$ 2,107		2,032		294	1,031	15,017		(841)	(13,469)	75
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	[1]	2,636		2,618				2,815		(197)		18
Dividends (Dividend declared per common share)		(761)		(749)				(749)				(12)
Acquisition of IHS Markit		43,536		43,536		121	43,415
Share repurchases		(11,003)		(11,003)			(313)				10,690
Employee stock plans		81		81			96				15
Change in redemption value of redeemable noncontrolling interest		653		653				653
Other		(9)		(1)				(1)				(8)
Ending Balance at Sep. 30, 2022		$ 37,240		37,167		415	44,229	17,735		(1,038)	(24,174)	73
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (USD per share)		$ 2.47
Beginning Balance at Jun. 30, 2022		$ 39,506		39,433		415	43,242	17,298		(811)	(20,711)	73
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income		387	[1]	381	[1]			608	[1]	(227)		6
Dividends (Dividend declared per common share)		(279)		(277)				(277)				(2)
Share repurchases		(2,500)		(2,500)			962				3,462
Employee stock plans		24		24			25				1
Change in redemption value of redeemable noncontrolling interest		106		106				106
Other		(4)										(4)
Ending Balance at Sep. 30, 2022		$ 37,240		$ 37,167		$ 415	$ 44,229	$ 17,735		$ (1,038)	$ (24,174)	$ 73
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared per common share (USD per share)		$ 0.85
Common stock, par value (USD per share)		$ 1

[1] Excludes comprehensive income of $64 million and $58 million for the three months ended September 30, 2022 and 2021, respectively, and $195 million and $161 million for the nine months ended September 30, 2022 and 2021, respectively, attributable to our redeemable noncontrolling interest.