CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Stockholders' Equity [Abstract]
Dividends declared per share attributable to Moody's common shareholders (in USD per share)	$ 3.76	$ 3.40	$ 3.08
Currency translation adjustment, tax	$ (158)	$ 80	$ (44)
Amortization of actuarial losses and prior service costs included in net income, tax	0	0	0
Net actuarial gains (losses) and prior service cost, tax	2	6	$ (2)
Amortization of losses on cash flow hedges (net of tax of $1 million)	$ 1	$ 1