CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenue	$ 1,522	$ 1,600
Expenses
Operating	417	393
Selling, general and administrative	371	293
Depreciation and amortization	78	59
Restructuring	0	2
Total expenses	866	747
Operating income	656	853
Non-operating (expense) income, net
Interest expense, net	(53)	(7)
Other non-operating income, net	6	16
Total non-operating (expense) income, net	(47)	9
Income before provision for income taxes	609	862
Provision for income taxes	111	126
Net income attributable to Moody's	$ 498	$ 736
Earnings per share attributable to Moody's common shareholders
Basic (in usd per share)	$ 2.69	$ 3.93
Diluted (in usd per share)	$ 2.68	$ 3.90
Weighted average number of shares outstanding
Basic (in shares)	185.1	187.2
Diluted (in shares)	186.1	188.6