CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net Income	$ 661	$ 625
Foreign Currency Adjustments:
Foreign currency translation adjustments - Pre Tax	(118)	188
Foreign currency translation adjustments - Tax	1	(1)
Foreign currency translation adjustments - Net of Tax	(117)	187
Net gains (losses) on net investment hedges - Pre Tax	127	(174)
Net gains (losses) on net investment hedges - Tax	(32)	44
Net gains (losses) on net investment hedges - Net of Tax	95	(130)
Cash Flow Hedges:
Reclassification of losses included in net income - Pre Tax	1	0
Reclassification of losses included in net income - Tax	0	0
Reclassification of losses included in net income - Net of Tax	1	0
Pension and Other Retirement Benefits:
Net actuarial gains - Pre Tax	1	0
Net actuarial gains - Tax	0	0
Net actuarial gains - Net of Tax	1	0
Total other comprehensive (loss) income - Pre Tax	11	14
Total other comprehensive (loss) income - Tax	(31)	43
Total other comprehensive (loss) income - Net of Tax	(20)	57
Comprehensive income	641	682
Less: comprehensive loss attributable to noncontrolling interests	(1)	(3)
Comprehensive Income Attributable to Moody's	$ 642	$ 685