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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Statement of Stockholders' Equity [Abstract] |  |  |
Dividends declared per share attributable to Moody's common shareholders (in USD per share) | $ 3.40 | $ 3.08 | $ 2.80
Currency translation adjustment, tax | $ (80) | $ 44 | $ (53)
Amortization of actuarial losses and prior service costs included in net income, tax | 0 | 0 | 1
Net actuarial gains (losses) and prior service cost, tax | 6 | (2) | $ (1)
Amortization of losses on cash flow hedges | $ 1 | $ 1 |

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- Definition Amount of tax expense (benefit) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 12 -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-12 + Details
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