Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 842	$ 602	$ 1,531	$ 1,055
Other comprehensive income:
Foreign currency translation adjustments	(17)	(17)	(54)	1
Income tax effect	(4)	2	2	4
Foreign currency translation adjustment, net of income tax effect	(21)	(15)	(52)	5
Pension and other postretirement benefit plans	(37)	0	(34)	114
Income tax effect	10	0	9	(28)
Pension and other postretirement benefit plans, net of income tax effect	(27)	0	(25)	86
Unrealized gain (loss) on forward exchange contracts	5	(4)	(4)	0
Income tax effect	(1)	1	1	0
Unrealized gain on investment and forward exchange contracts, net of income tax effect	4	(3)	(3)	0
Comprehensive income	798	584	1,451	1,146
Less: comprehensive income attributable to nonredeemable noncontrolling interests	(4)	(3)	(5)	(6)
Less: comprehensive income attributable to redeemable noncontrolling interests	(46)	(44)	(95)	(84)
Comprehensive income attributable to S&P Global Inc.	$ 748	$ 537	$ 1,351	$ 1,056