CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Revenue	$ 1,786	$ 1,470
Expenses
Operating	467	428
Selling, general, and administrative	413	386
Depreciation and amortization	100	88
Restructuring	5	14
Total expenses	985	916
Operating income	801	554
Non-operating (expense) income, net
Interest expense, net	(62)	(48)
Other non-operating income, net	13	0
Total non-operating (expense) income, net	(49)	(48)
Income before provision for income taxes	752	506
Provision for income taxes	175	5
Net income attributable to Moody's	$ 577	$ 501
Earnings per share attributable to Moody's common shareholders
Basic (in usd per share)	$ 3.16	$ 2.73
Diluted (in usd per share)	$ 3.15	$ 2.72
Weighted average number of shares outstanding
Basic (in shares)	182.6	183.3
Diluted (in shares)	183.4	184.1