XML 39 R29.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 30,058 | $ 29,691
Operating Segments | Connectivity & Platforms |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 20,275 | 20,153
Operating Segments | Content & Experiences |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 10,374 | 10,259
Operating Segments | Residential Connectivity & Platforms |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 17,868 | 17,869
Operating Segments | Residential Connectivity & Platforms | Connectivity & Platforms |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 17,868 | 17,869
Operating Segments | Residential Connectivity & Platforms | Residential Connectivity | Connectivity & Platforms |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 8,679 | 8,099
Operating Segments | Residential Connectivity & Platforms | Domestic broadband | Connectivity & Platforms |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 6,591 | 6,343
Operating Segments | Residential Connectivity & Platforms | Domestic wireless | Connectivity & Platforms |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 972 | 858
Operating Segments | Residential Connectivity & Platforms | International connectivity | Connectivity & Platforms |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,116 | 897
Operating Segments | Residential Connectivity & Platforms | Video | Connectivity & Platforms |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 6,876 | 7,382
Operating Segments | Residential Connectivity & Platforms | Advertising | Connectivity & Platforms |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 951 | 907
Operating Segments | Residential Connectivity & Platforms | Other | Connectivity & Platforms |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,362 | 1,482
Operating Segments | Business Services Connectivity |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,407 | 2,283
Operating Segments | Business Services Connectivity | Connectivity & Platforms |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,407 | 2,283
Operating Segments | Media |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 6,371 | 6,152
Operating Segments | Media | Content & Experiences |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 6,371 | 6,152
Operating Segments | Media | Other | Content & Experiences |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 420 | 410
Operating Segments | Media | Domestic advertising | Content & Experiences |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,025 | 2,025
Operating Segments | Media | Domestic distribution | Content & Experiences |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,906 | 2,709
Operating Segments | Media | International networks | Content & Experiences |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,021 | 1,008
Operating Segments | Studios |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,743 | 2,956
Operating Segments | Studios | Content & Experiences |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,743 | 2,956
Operating Segments | Studios | Other | Content & Experiences |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 312 | 292
Operating Segments | Studios | Content licensing | Content & Experiences |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,101 | 2,344
Operating Segments | Studios | Theatrical | Content & Experiences |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 330 | 319
Operating Segments | Theme Parks |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,979 | 1,949
Operating Segments | Theme Parks | Content & Experiences |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,979 | 1,949
Headquarters/Corporate and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 767 | 707
Headquarters/Corporate and Other | Content & Experiences |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 12 | 19
Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 2,089 | 2,244
Eliminations | Content & Experiences |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ (731) | $ (817)

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 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 2: 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 3: 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 4: 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 5: 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 6: http://www.xbrl.org/2003/role/disclosureRef -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 7: 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 8: 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 9: http://www.xbrl.org/2003/role/disclosureRef -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 10: 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 11: 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_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cmcsa_BusinessUnitAxis=cmcsa_ConnectivityAndPlatformsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cmcsa_BusinessUnitAxis=cmcsa_ContentAndExperiencesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_ProductOrServiceAxis=cmcsa_ResidentialConnectivityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cmcsa_DomesticBroadbandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cmcsa_DomesticWirelessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cmcsa_InternationalConnectivityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cmcsa_VideoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_AdvertisingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cmcsa_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | srt_ProductOrServiceAxis=cmcsa_DomesticAdvertisementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cmcsa_DomesticDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cmcsa_InternationalNetworksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_ProductOrServiceAxis=cmcsa_ContentLicensingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cmcsa_TheatricalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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