Condensed Consolidated Financial Statements (Policies)	6 Months Ended
Jun. 30, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	We have prepared these unaudited condensed consolidated financial statements based on SEC rules that permit reduced disclosure for interim periods. These financial statements include all adjustments that are necessary for a fair presentation of our consolidated results of operations, cash flows and financial condition for the periods shown, including normal, recurring accruals and other items. The consolidated results of operations for the interim periods presented are not necessarily indicative of results for the full year. The year-end condensed consolidated balance sheet was derived from audited financial statements but does not include all disclosures required by generally accepted accounting principles in the United States (“GAAP”). For a more complete discussion of our accounting policies and certain other information, refer to our consolidated financial statements included in our 2025 Annual Report on Form 10-K. In June 2026, we announced our intention to separate into two independent publicly traded companies through a tax-free spin-off of NBCUniversal and Sky (the “NBCUniversal Spin-off”) comprised primarily of the Media, Studios and Theme Parks segments and the Sky businesses within our Residential Connectivity & Platforms and Business Services segments. The NBCUniversal Spin-off is expected to be completed in mid-2027, subject to the satisfaction of customary conditions, including obtaining final approval from our Board of Directors, receipt of tax opinions and regulatory approvals, and completion of financing arrangements. We expect to retain an ownership interest of up to 19.9% in the NBCUniversal Spin-off entities for up to one year after the completion of the spin-off, which we intend to monetize in a tax-efficient manner over time. There can be no assurance that a separation transaction will occur, or, if one does occur, of its terms or timing. The condensed consolidated financial statements and related notes do not reflect the proposed NBCUniversal Spin-off.
Reclassifications	Certain prior period amounts have been reclassified to conform to the current period presentation. See Note 2 for a discussion of the changes in our presentation of segment operating results. See Note 3 for a discussion of the changes in our presentation of disaggregated revenue.
Recent Accounting Pronouncements	Disaggregation of Income Statement Expenses In November 2024, the FASB issued updated accounting guidance related to disclosures about certain costs and expenses. The updated accounting guidance, among other things, requires quantitative disclosures for employee compensation, selling expenses and purchases of inventory. The updated guidance is effective beginning with our Annual Report on Form 10-K for the year ending December 31, 2027. We are currently evaluating the impact the adoption of the new accounting guidance will have on our disclosures. Internal-Use Software In September 2025, the FASB updated the accounting guidance related to internal-use software. The updated guidance eliminates references to software project stages and clarifies that capitalization of internal-use software costs should begin once management authorizes and commits to funding a software project and it is probable that the project will be completed and used as intended. The updated guidance is effective for us as of January 1, 2028, and early adoption is permitted. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements. Government Grants In December 2025, the FASB issued new accounting guidance on the recognition, measurement and presentation of government grants received by business entities. The new guidance defines government grants, clarifies their scope and provides a recognition threshold under which a grant is recognized when it is probable the entity will comply with the grant’s conditions and that the grant will be received. The updated guidance is effective for us as of January 1, 2029, and early adoption is permitted. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements. Interim Reporting In December 2025, the FASB issued updated accounting guidance on interim reporting. The updated guidance establishes a principle requiring entities to disclose events occurring after the end of the most recent annual reporting period that have a material impact on the entity, as well as clarifies the applicability of interim disclosure requirements. The guidance does not change the fundamental nature of interim reporting or expand or reduce current interim disclosure requirements. The guidance is effective for us as of January 1, 2028, and early adoption is permitted. We are currently evaluating the impact the adoption of the new accounting guidance will have on our disclosures
Earnings Per Share	Weighted-average common shares outstanding used in calculating diluted earnings per common share attributable to Comcast Corporation shareholders (“diluted EPS”) considers the impact of potentially dilutive securities using the treasury stock method. Antidilutive securities represent the number of potential common shares related to share-based compensation awards that were excluded from diluted EPS because their effect would have been antidilutive.

Condensed Consolidated Financial Statements (Policies)

6 Months Ended

Jun. 30, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

We have prepared these unaudited condensed consolidated financial statements based on SEC rules that permit reduced disclosure for interim periods. These financial statements include all adjustments that are necessary for a fair presentation of our consolidated results of operations, cash flows and financial condition for the periods shown, including normal, recurring accruals and other items. The consolidated results of operations for the interim periods presented are not necessarily indicative of results for the full year.

The year-end condensed consolidated balance sheet was derived from audited financial statements but does not include all disclosures required by generally accepted accounting principles in the United States (“GAAP”). For a more complete discussion of our accounting policies and certain other information, refer to our consolidated financial statements included in our 2025 Annual Report on Form 10-K.

In June 2026, we announced our intention to separate into two independent publicly traded companies through a tax-free spin-off of NBCUniversal and Sky (the “NBCUniversal Spin-off”) comprised primarily of the Media, Studios and Theme Parks segments and the Sky businesses within our Residential Connectivity & Platforms and Business Services segments. The NBCUniversal Spin-off is expected to be completed in mid-2027, subject to the satisfaction of customary conditions, including obtaining final approval from our Board of Directors, receipt of tax opinions and regulatory approvals, and completion of financing arrangements. We expect to retain an ownership interest of up to 19.9% in the NBCUniversal Spin-off entities for up to one year after the completion of the spin-off, which we intend to monetize in a tax-efficient manner over time. There can be no assurance that a separation transaction will occur, or, if one does occur, of its terms or timing. The condensed consolidated financial statements and related notes do not reflect the proposed NBCUniversal Spin-off.

Reclassifications

Certain prior period amounts have been reclassified to conform to the current period presentation. See Note 2 for a discussion of the changes in our presentation of segment operating results. See Note 3 for a discussion of the changes in our presentation of disaggregated revenue.

Recent Accounting Pronouncements

Disaggregation of Income Statement Expenses

In November 2024, the FASB issued updated accounting guidance related to disclosures about certain costs and expenses. The updated accounting guidance, among other things, requires quantitative disclosures for employee compensation, selling expenses and purchases of inventory. The updated guidance is effective beginning with our Annual Report on Form 10-K for the year ending December 31, 2027. We are currently evaluating the impact the adoption of the new accounting guidance will have on our disclosures.

Internal-Use Software

In September 2025, the FASB updated the accounting guidance related to internal-use software. The updated guidance eliminates references to software project stages and clarifies that capitalization of internal-use software costs should begin once management authorizes and commits to funding a software project and it is probable that the project will be completed and used as intended. The updated guidance is effective for us as of January 1, 2028, and early adoption is permitted. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements.

Government Grants

In December 2025, the FASB issued new accounting guidance on the recognition, measurement and presentation of government grants received by business entities. The new guidance defines government grants, clarifies their scope and provides a recognition threshold under which a grant is recognized when it is probable the entity will comply with the grant’s conditions and that the grant will be received. The updated guidance is effective for us as of January 1, 2029, and early adoption is permitted. We are currently in the process of determining the impact that the updated accounting guidance will have on our consolidated financial statements.

Interim Reporting

In December 2025, the FASB issued updated accounting guidance on interim reporting. The updated guidance establishes a principle requiring entities to disclose events occurring after the end of the most recent annual reporting period that have a material impact on the entity, as well as clarifies the applicability of interim disclosure requirements. The guidance does not change the fundamental nature of interim reporting or expand or reduce current interim disclosure requirements. The guidance is effective for us as of January 1, 2028, and early adoption is permitted. We are currently evaluating the impact the adoption of the new accounting guidance will have on our disclosures

Earnings Per Share

Weighted-average common shares outstanding used in calculating diluted earnings per common share attributable to Comcast Corporation shareholders (“diluted EPS”) considers the impact of potentially dilutive securities using the treasury stock method. Antidilutive securities represent the number of potential common shares related to share-based compensation awards that were excluded from diluted EPS because their effect would have been antidilutive.