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Report of Independent Registered Public Accounting Firm
To the Board of Directors and Stockholders of
Comcast Corporation
Philadelphia, Pennsylvania
We have audited the accompanying consolidated balance sheets of Comcast Corporation and subsidiaries
(the “Company”) as of December 31, 2011 and 2010, and the related consolidated statements of income,
comprehensive income, cash flows and changes in equity for each of the three years in the period ended
December 31, 2011. We also have audited the Company’s internal control over financial reporting as of
December 31, 2011, based on criteria established in Internal Control — Integrated Framework issued by the
Committee of Sponsoring Organizations of the Treadway Commission. The Company’s management is
responsible for these financial statements, for maintaining effective internal control over financial reporting,
and for its assessment of the effectiveness of internal control over financial reporting, included in the accom-
panying Management’s Report on Internal Control Over Financial Reporting. Our responsibility is to express
an opinion on these financial statements and an opinion on the Company’s internal control over financial
reporting based on our audits.
We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board
(United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about
whether the financial statements are free of material misstatement and whether effective internal control over finan-
cial reporting was maintained in all material respects. Our audits of the financial statements included examining, on
a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the account-
ing principles used and significant estimates made by management, and evaluating the overall financial statement
presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal
control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the
design and operating effectiveness of internal control based on the assessed risk. Our audits also included
performing such other procedures as we considered necessary in the circumstances. We believe that our audits
provide a reasonable basis for our opinions.
A company’s internal control over financial reporting is a process designed by, or under the supervision of,
the company’s principal executive and principal financial officers, or persons performing similar functions, and
effected by the company’s board of directors, management, and other personnel to provide reasonable
assurance regarding the reliability of financial reporting and the preparation of financial statements for
external purposes in accordance with generally accepted accounting principles. A company’s internal control
over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records
that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the
company; (2) provide reasonable assurance that transactions are recorded as necessary to permit prepara-
tion of financial statements in accordance with generally accepted accounting principles, and that receipts
and expenditures of the company are being made only in accordance with authorizations of management and
directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of
unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the
financial statements.
Because of the inherent limitations of internal control over financial reporting, including the possibility of collu-
sion or improper management override of controls, material misstatements due to error or fraud may not be
prevented or detected on a timely basis. Also, projections of any evaluation of the effectiveness of the internal
control over financial reporting to future periods are subject to the risk that the controls may become
inadequate because of changes in conditions, or that the degree of compliance with the policies or proce-
dures may deteriorate.
In our opinion, the consolidated financial statements referred to above present fairly, in all material respects,
the financial position of Comcast Corporation and subsidiaries as of December 31, 2011 and 2010, and the
results of their operations and their cash flows for each of the three years in the period ended December 31,
2011, in conformity with accounting principles generally accepted in the United States of America. Also, in
our opinion, the Company maintained, in all material respects, effective internal control over financial report-
ing as of December 31, 2011, based on the criteria established in Internal Control — Integrated Framework
issued by the Committee of Sponsoring Organizations of the Treadway Commission.
/s/ Deloitte & Touche LLP
Philadelphia, Pennsylvania
February 22, 2012
Comcast 2011 Annual Report on Form 10-K 76