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
Beginning Balance at Dec. 31, 2018		$ 684	$ 628	$ 294	$ 833	$ 11,284	$ (742)	$ (11,041)	$ 56
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	[1]	2,251	2,241			2,123	118		10
Dividends (Dividend declared per common share)		(570)	(560)			(560)			(10)
Share repurchases		(1,240)	(1,240)		75			1,315
Employee stock plans		52	52		(5)			(57)
Capital contribution from noncontrolling interest		(36)	(36)			(36)
Change in redemption value of redeemable noncontrolling interest		(608)	(608)			(608)
Other		3	2			2			1
Ending Balance at Dec. 31, 2019		536	479	294	903	12,205	(624)	(12,299)	57
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	[1]	2,340	2,326			2,339	(13)		14
Dividends (Dividend declared per common share)		(656)	(645)			(645)			(11)
Share repurchases		(1,164)	(1,164)					1,164
Employee stock plans		45	45		43			(2)
Change in redemption value of redeemable noncontrolling interest		(532)	(532)			(532)
Other		2	0						2
Ending 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]	2,844	2,820			3,024	(204)		24
Dividends (Dividend declared per common share)		(756)	(743)			(743)			(13)
Employee stock plans		77	77		85			8
Change in redemption value of redeemable noncontrolling interest		(631)	(631)			(631)
Other		2	0						2
Ending Balance at Dec. 31, 2021		$ 2,107	$ 2,032	$ 294	$ 1,031	$ 15,017	$ (841)	$ (13,469)	$ 75

[1] Excludes $215 million, $181 million and $170 million in 2021, 2020 and 2019, respectively, attributable to redeemable noncontrolling interest.