CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions	Total	Total Moody's Shareholders' Equity	Common Stock	Capital Surplus	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Non- Controlling Interests
Common stock, shares issued beginning balance (in shares) at Dec. 31, 2024			342,900,000
Treasury stock, common, beginning balance (shares) at Dec. 31, 2024						(162,600,000)
Beginning Balance at Dec. 31, 2024	$ 3,727	$ 3,565	$ 3	$ 1,451	$ 16,071	$ (13,322)	$ (638)	$ 162
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	625	625			625			0
Dividends	(171)	(170)			(170)			(1)
Stock-based compensation	58	58		58
Shares issued for stock-based compensation plans at average cost, net	(64)	(64)		(26)		$ (38)
Shares issued for stock-based compensation plans at average cost, net (in shares)						400,000
Treasury shares repurchased, inclusive of excise tax	(374)	(374)		0		$ (374)
Treasury shares repurchased, inclusive of excise tax (in shares)						(800,000)
Currency translation adjustment, net of net investment hedge activity (net of tax)	57	60					60	(3)
Net actuarial gains (losses) and prior service costs (net of tax)	0
Common stock, shares issued ending balance (in shares) at Mar. 31, 2025			342,900,000
Treasury stock, common, ending balance (shares) at Mar. 31, 2025						(163,000,000.0)
Ending Balance at Mar. 31, 2025	$ 3,858	3,700	$ 3	1,483	16,526	$ (13,734)	(578)	158
Common stock, shares issued beginning balance (in shares) at Dec. 31, 2025			342,900,000
Treasury stock, common, beginning balance (shares) at Dec. 31, 2025	(165,359,285)					(165,400,000)
Beginning Balance at Dec. 31, 2025	$ 4,205	4,054	$ 3	1,676	17,853	$ (14,978)	(500)	151
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	661	661			661			0
Dividends	(184)	(183)			(183)			(1)
Stock-based compensation	58	58		58
Shares issued for stock-based compensation plans at average cost, net	(94)	(94)		(48)		$ (46)
Shares issued for stock-based compensation plans at average cost, net (in shares)						400,000
Treasury shares repurchased, inclusive of excise tax	(1,483)	(1,483)		0		$ (1,483)
Treasury shares repurchased, inclusive of excise tax (in shares)						(3,200,000)
Currency translation adjustment, net of net investment hedge activity (net of tax)	(22)	(21)					(21)	(1)
Net actuarial gains (losses) and prior service costs (net of tax)	1	1					1
Amortization of losses on cash flow hedges	$ 1	1					1
Common stock, shares issued ending balance (in shares) at Mar. 31, 2026			342,900,000
Treasury stock, common, ending balance (shares) at Mar. 31, 2026	(168,225,834)					(168,200,000)
Ending Balance at Mar. 31, 2026	$ 3,143	$ 2,994	$ 3	$ 1,686	$ 18,331	$ (16,507)	$ (519)	$ 149