-Network: (11 - Statement - Statement Of Financial Position Classified)

-Statement of Financial Position [Abstract] {ID1}

-Statement [Table] {ID2}

-Statement [Line Items] {ID3}

-ASSETS {ID4}

-Current Assets: {ID5}

Cash and cash equivalents {ID6}

Investments {ID7}

Accounts receivable, less allowance for doubtful accounts of $192 and $190 {ID8}

Other current assets {ID9}

Total current assets {ID10}

Investments {ID11}

Property and equipment, net of accumulated depreciation of $25,544 and $23,235 {ID12}

Franchise rights {ID13}

Goodwill {ID14}

Other intangible assets, net of accumulated amortization of $8,299 and $8,160 {ID15}

Other noncurrent assets, net {ID16}

Total assets {ID17}

-LIABILITIES AND EQUITY {ID18}

-Current Liabilities: {ID19}

Accounts payable and accrued expenses related to trade creditors {ID20}

Accrued expenses and other current liabilities {ID21}

Current portion of long-term debt {ID22}

Total current liabilities {ID23}

Long-term debt, less current portion {ID24}

Deferred income taxes {ID25}

Other noncurrent liabilities {ID26}

-Commitments and Contingencies (Note 10) {ID27}

Redeemable noncontrolling interests {ID28}

-Equity: {ID29}

Preferred stock-authorized, 20,000,000 shares; issued, zero {ID30}

Additional paid-in capital {ID31}

Retained earnings {ID32}

Treasury stock-365,460,750 Class A common shares and 70,934,764 Class A Special common shares {ID33}

Accumulated other comprehensive income (loss) {ID34}

Total Comcast Corporation stockholders' equity {ID35}

Noncontrolling interests {ID36}

Total equity {ID37}

Common stock {ID38}

Total liabilities and equity {ID39}

-Class of Stock [Domain] {ID40}

Class A common stock {ID41}

Class A Special common stock {ID42}

Class B common stock {ID43}

-Network: (12 - Statement - Statement Of Financial Position Classified (Parenthetical))

-Statement of Financial Position [Abstract] {ID44}

-Statement [Table] {ID45}

-Statement [Line Items] {ID46}

Accounts receivable, allowance for doubtful accounts {ID47}

Property and equipment, accumulated depreciation {ID48}

Other intangible assets, accumulated amortization {ID49}

Preferred stock, authorized {ID50}

Preferred stock, issued {ID51}

Common stock, par value {ID52}

Common stock, authorized {ID53}

Common stock, issued {ID54}

Common stock, outstanding {ID55}

Treasury stock common shares {ID56}

-Class of Stock [Domain] {ID57}

Class A common stock {ID58}

Class A Special common stock {ID59}

Class B common stock {ID60}

-Network: (13 - Statement - Statement Of Income Alternative)

-Income Statement [Abstract] {ID61}

-Statement [Table] {ID62}

-Statement [Line Items] {ID63}

Revenue {ID64}

-Costs and Expenses: {ID65}

Operating (excluding depreciation and amortization) {ID66}

Selling, general and administrative {ID67}

Depreciation {ID68}

Amortization {ID69}

Costs and Expenses, Total {ID70}

Operating income {ID71}

-Other Income (Expense): {ID72}

Interest expense {ID73}

Investment income (loss), net {ID74}

Equity in net income (losses) of affiliates, net {ID75}

Other income (expense) {ID76}

Nonoperating Income (Expense), Total {ID77}

Income before income taxes {ID78}

Income tax expense {ID79}

Net income from consolidated operations {ID80}

Net (income) loss attributable to noncontrolling interests {ID81}

Net income attributable to Comcast Corporation {ID82}

Basic earnings per common share attributable to Comcast Corporation stockholders {ID83}

Diluted earnings per common share attributable to Comcast Corporation stockholders {ID84}

Dividends declared per common share attributable to Comcast Corporation stockholders {ID85}

-Network: (14 - Statement - Statement Of Cash Flows Indirect)

-Statement of Cash Flows [Abstract] {ID86}

-Statement [Table] {ID87}

-Statement [Line Items] {ID88}

Net cash provided by operating activities {ID89}

-Financing Activities {ID90}

Proceeds from borrowings {ID91}

Repurchases and repayments of debt {ID92}

Repurchases of common stock {ID93}

Dividends paid {ID94}

Issuances of common stock {ID95}

Other {ID96}

Net cash provided by (used in) financing activities {ID97}

-Investing Activities {ID98}

Capital expenditures {ID99}

Cash paid for intangible assets {ID100}

Acquisitions, net of cash acquired {ID101}

Proceeds from sales of investments {ID102}

Purchases of investments {ID103}

Other {ID104}

Net cash provided by (used in) investing activities {ID105}

Increase (decrease) in cash and cash equivalents {ID106}

Cash and cash equivalents, beginning of period {ID107}

Cash and cash equivalents, end of period {ID108}

-Network: (15 - Statement - Statement Of Shareholders Equity And Other Comprehensive Income)

-Statement of Stockholders' Equity [Abstract] {ID109}

-Statement [Table] {ID110}

-Statement, Equity Components [Axis] {ID111}

-Equity Component [Domain] {ID112}

Redeemable Noncontrolling Interests {ID113}

Common Stock A {ID114}

Common Stock A Special {ID115}

Common Stock B {ID116}

Additional Paid-In Capital {ID117}

Retained Earnings {ID118}

Treasury Stock at Cost {ID119}

Accumulated Other Comprehensive Income (Loss) {ID120}

Noncontrolling Interests {ID121}

-Statement [Line Items] {ID122}

Accumulated Other Comprehensive Income (Loss) {ID123}

Beginning Balance {ID124}

Cumulative effect related to change in accounting principle on January 1, 2008 {ID125}

Stock compensation plans {ID126}

Repurchase and retirement of common stock {ID127}

Employee stock purchase plan {ID128}

Share exchange {ID129}

Dividends declared {ID130}

Other comprehensive income (loss) {ID131}

Sale (purchase) of subsidiary shares to (from) noncontrolling interests, net {ID132}

Purchases of subsidiary shares from noncontrolling interests {ID133}

Contributions from and (distributions to) noncontrolling interests {ID134}

Net income (loss) {ID135}

Ending Balance {ID136}

-Network: (16 - Statement - Statement Of Other Comprehensive Income)

-Statement of Income and Comprehensive Income [Abstract] {ID137}

-Statement [Table] {ID138}

-Statement [Line Items] {ID139}

Net income from consolidated operations {ID140}

Holding gains (losses) during the period, net of deferred taxes of $(2), $3, $(1) and $6 {ID141}

Reclassification adjustments for losses (gains) included in net income attributable to Comcast Corporation, net of deferred taxes of $(2), $(1), $(14) and $(3) {ID142}

Employee benefit obligations, net of deferred taxes {ID143}

Cumulative translation adjustments {ID144}

Comprehensive income {ID145}

Net (income) loss attributable to noncontrolling interests {ID146}

Comprehensive income attributable to Comcast Corporation {ID147}

-Network: (17 - Statement - Statement Of Other Comprehensive Income (Parenthetical))

-Statement of Income and Comprehensive Income [Abstract] {ID148}

-Statement [Table] {ID149}

-Statement [Line Items] {ID150}

Holding gains (losses) during the period, deferred taxes {ID151}

Reclassification adjustments for losses (gains) included in net income attributable to Comcast Corporation, deferred taxes {ID152}

-Network: (18 - Disclosure - Notes to Financial Statements)

-Notes to Financial Statements [Abstract] {ID153}

Note 1: Condensed Consolidated Financial Statements {ID154}

Note 2: Recent Accounting Pronouncements {ID155}

Note 3: Earnings Per Share {ID156}

Note 4: Investments {ID157}

Note 5: Long-Term Debt {ID158}

Note 6: Derivative Financial Instruments and Fair Value Measurements {ID159}

Note 7: Noncontrolling Interests {ID160}

Note 8: Equity {ID161}

Note 9: Statement of Cash Flows-Supplemental Information {ID162}

Note 10: Commitments and Contingencies {ID163}

Note 11: Financial Data by Business Segment {ID164}

Note 12: Condensed Consolidating Financial Information {ID165}

-Network: (19 - Disclosure - Document Information)

-Document Information [Text Block] {ID166}

Document Type {ID167}

Amendment Flag {ID168}

Amendment Description {ID169}

Document Period End Date {ID170}

-Network: (20 - Disclosure - Entity Information)

-Entity [Text Block] {ID171}

Trading Symbol {ID172}

Entity Registrant Name {ID173}

Entity Central Index Key {ID174}

Current Fiscal Year End Date {ID175}

Entity Well-known Seasoned Issuer {ID176}

Entity Current Reporting Status {ID177}

Entity Voluntary Filers {ID178}

Entity Filer Category {ID179}

Entity Common Stock, Shares Outstanding {ID180}

Entity Public Float {ID181}

-Class of Stock [Domain] {ID182}

Class A common stock {ID183}

Class A Special common stock {ID184}

Class B common stock {ID185}

COMCAST CORP XBRL Taxonomy Presentation Networks