XML 154 R42.htm IDEA: XBRL DOCUMENT
v3.24.2

Revenues - Revenues Disaggregated by Line of Business and Geographical Area (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 1,817 | $ 1,494 | $ 3,603 | $ 2,964
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 974 | 775 | 1,943 | 1,538
Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 843 | 719 | 1,660 | 1,426
MA |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 802 | 747 | 1,601 | 1,484
MA | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 806 | 751 | 1,608 | 1,491
MA | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 338 | 320 | 675 | 637
MA | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 338 | 320 | 675 | 637
MA | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 464 | 427 | 926 | 847
MA | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 464 | 427 | 926 | 847
MA | Decision Solutions (DS) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 366 | 334 |  |
MA | Decision Solutions (DS) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 366 | 334 | 731 | 668
MA | Decision Solutions (DS) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 138 | 133 |  |
MA | Decision Solutions (DS) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 276 | 265
MA | Decision Solutions (DS) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 228 | 201 |  |
MA | Decision Solutions (DS) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 455 | 403
MA | Research and Insights (R&I) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 226 | 217 |  |
MA | Research and Insights (R&I) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 226 | 217 | 448 | 432
MA | Research and Insights (R&I) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 124 | 119 |  |
MA | Research and Insights (R&I) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 246 | 237
MA | Research and Insights (R&I) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 102 | 98 |  |
MA | Research and Insights (R&I) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 202 | 195
MA | Data and Information (D&I) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 210 | 196 |  |
MA | Data and Information (D&I) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 210 | 196 | 422 | 384
MA | Data and Information (D&I) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 76 | 68 |  |
MA | Data and Information (D&I) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 153 | 135
MA | Data and Information (D&I) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 134 | 128 |  |
MA | Data and Information (D&I) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 269 | 249
MIS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,015 | 747 | 2,002 | 1,480
MIS | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,064 | 793 | 2,098 | 1,571
MIS | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 636 | 455 | 1,268 | 901
MIS | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 636 | 455 | 1,268 | 901
MIS | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 379 | 292 | 734 | 579
MIS | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 379 | 292 | 734 | 579
MIS | Corporate Finance (CFG) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 525 | 365 |  |
MIS | Corporate Finance (CFG) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 525 | 365 | 1,054 | 721
MIS | Corporate Finance (CFG) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 342 | 239 |  |
MIS | Corporate Finance (CFG) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 714 | 485
MIS | Corporate Finance (CFG) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 183 | 126 |  |
MIS | Corporate Finance (CFG) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 340 | 236
MIS | Structured Finance (SFG) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 131 | 102 |  |
MIS | Structured Finance (SFG) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 131 | 102 | 245 | 201
MIS | Structured Finance (SFG) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 92 | 60 |  |
MIS | Structured Finance (SFG) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 168 | 121
MIS | Structured Finance (SFG) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 39 | 42 |  |
MIS | Structured Finance (SFG) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 77 | 80
MIS | Financial Institutions (FIG) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 195 | 145 |  |
MIS | Financial Institutions (FIG) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 195 | 145 | 390 | 287
MIS | Financial Institutions (FIG) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 104 | 73 |  |
MIS | Financial Institutions (FIG) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 202 | 136
MIS | Financial Institutions (FIG) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 91 | 72 |  |
MIS | Financial Institutions (FIG) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 188 | 151
MIS | Public, Project and Infrastructure Finance (PPIF) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 154 | 127 |  |
MIS | Public, Project and Infrastructure Finance (PPIF) | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 154 | 127 | 295 | 256
MIS | Public, Project and Infrastructure Finance (PPIF) | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 98 | 83 |  |
MIS | Public, Project and Infrastructure Finance (PPIF) | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 184 | 159
MIS | Public, Project and Infrastructure Finance (PPIF) | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 56 | 44 |  |
MIS | Public, Project and Infrastructure Finance (PPIF) | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 111 | 97
MIS | Total ratings revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,005 | 739 |  |
MIS | Total ratings revenue | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,005 | 739 | 1,984 | 1,465
MIS | Total ratings revenue | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 636 | 455 |  |
MIS | Total ratings revenue | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 1,268 | 901
MIS | Total ratings revenue | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 369 | 284 |  |
MIS | Total ratings revenue | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 716 | 564
MIS | MIS Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 10 | 8 |  |
MIS | MIS Other | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 10 | 8 | 18 | 15
MIS | MIS Other | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 |  |
MIS | MIS Other | United States | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | 0 | 0
MIS | MIS Other | Non-U.S. |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 10 | $ 8 |  |
MIS | MIS Other | Non-U.S. | Operating Segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue |  |  | $ 18 | $ 15

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 91 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479777/606-10-55-91 + Details
Name: | us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 924 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479941/924-10-S99-1 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-42 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-40 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-4 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=us-gaap_NonUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mco_MoodysAnalyticsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=mco_DecisionSolutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=mco_ResearchAndInsightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=mco_DataAndInformationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mco_MoodysInvestorsServiceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=mco_CorporateFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=mco_StructuredFinanceLineOfBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=mco_FinancialInstitutionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=mco_PublicProjectAndInfrastructureFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=mco_RatingRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsegmentsAxis=mco_MISOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |