$CMCSA
COMCAST CORP Stock $cmcsa

$cmcsa Overview Financials Valuation SEC Filings Company Website

2013 Q4 Form 10-K Financial Statement

#000119312515068526 Filed on February 27, 2015

Income Statement

Concept	2013 Q4	2013 Q3	2013 Q2
Revenue	$16.93B	$16.15B	$16.27B
YoY Change	6.21%	-2.38%	6.96%
Cost Of Revenue	$5.252B	$4.787B	$4.968B
YoY Change	6.83%	-16.4%	9.16%
Gross Profit	$11.67B	$11.36B	$11.30B
YoY Change	5.93%	5.05%	6.02%
Gross Profit Margin	68.97%	70.36%	69.47%
Selling, General & Admin	$6.029B	$6.034B	$5.877B
YoY Change	4.96%	3.86%	3.91%
% of Gross Profit	51.64%	53.1%	52.0%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$1.998B	$1.520B	$1.583B
YoY Change	0.76%	-1.87%	4.42%
% of Gross Profit	17.11%	13.38%	14.01%
Operating Expenses	$8.027B	$7.950B	$7.867B
YoY Change	3.88%	2.32%	3.77%
Operating Profit	$3.647B	$3.414B	$3.435B
YoY Change	10.72%	12.01%	11.56%
Interest Expense	-$619.0M	$639.0M	$636.0M
YoY Change	11.53%	0.95%	1.76%
% of Operating Profit	-16.97%	18.72%	18.52%
Other Income/Expense, Net	-$70.00M	-$615.0M	-$643.0M
YoY Change	-53.95%	-146.07%	1.26%
Pretax Income	$2.954B	$2.799B	$2.792B
YoY Change	14.27%	-36.14%	14.24%
Income Tax	$986.0M	$1.021B	$1.048B
% Of Pretax Income	33.38%	36.48%	37.54%
Net Earnings	$1.913B	$1.732B	$1.734B
YoY Change	26.02%	-18.03%	28.64%
Net Earnings / Revenue	11.3%	10.72%	10.66%
Basic Earnings Per Share	$0.73	$0.66	$0.66
Diluted Earnings Per Share	$0.72	$0.65	$0.65
COMMON SHARES
Basic Shares Outstanding		2.622B shares	2.631B shares
Diluted Shares Outstanding		2.658B shares	2.666B shares

Balance Sheet

Concept	2013 Q4	2013 Q3	2013 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$6.063B	$6.393B	$7.198B
YoY Change	-60.74%	-50.99%	28.19%
Cash & Equivalents	$1.718B	$1.603B	$1.389B
Short-Term Investments	$4.345B	$4.790B	$5.809B
Other Short-Term Assets	$1.480B	$2.171B	$1.215B
YoY Change	29.14%	35.18%	-20.12%
Inventory
Prepaid Expenses
Receivables	$6.376B	$5.501B	$5.507B
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$14.08B	$13.41B	$12.74B
YoY Change	-29.59%	-25.79%	12.16%
LONG-TERM ASSETS
Property, Plant & Equipment	$29.84B	$28.81B	$28.26B
YoY Change	9.58%	6.75%	5.07%
Goodwill	$27.10B
YoY Change	0.42%
Intangibles
YoY Change
Long-Term Investments	$989.0M	$1.040B	$1.082B
YoY Change	-15.03%	-8.37%	-77.04%
Other Assets	$2.343B	$2.345B	$2.311B
YoY Change	7.48%	7.37%	7.74%
Total Long-Term Assets	$144.7B	$143.2B	$144.1B
YoY Change	-0.17%	-0.83%	-1.54%
TOTAL ASSETS
Total Short-Term Assets	$14.08B	$13.41B	$12.74B
Total Long-Term Assets	$144.7B	$143.2B	$144.1B
Total Assets	$158.8B	$156.6B	$156.8B
YoY Change	-3.73%	-3.61%	-0.55%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$5.528B	$6.032B	$6.077B
YoY Change	-10.92%	-3.49%	6.06%
Accrued Expenses	$7.967B	$9.296B	$7.419B
YoY Change	34.33%	51.97%	56.82%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$3.280B	$2.337B	$2.535B
YoY Change	38.05%	-16.51%	-14.18%
Total Short-Term Liabilities	$18.91B	$18.67B	$18.60B
YoY Change	13.15%	7.68%	18.17%
LONG-TERM LIABILITIES
Long-Term Debt	$44.57B	$44.19B	$44.11B
YoY Change	17.03%	23.46%	29.08%
Other Long-Term Liabilities	$11.38B	$11.49B	$12.46B
YoY Change	-14.22%	-10.63%	-7.23%
Total Long-Term Liabilities	$11.38B	$55.68B	$12.46B
YoY Change	-14.22%	332.98%	-7.23%
TOTAL LIABILITIES
Total Short-Term Liabilities	$18.91B	$18.67B	$18.60B
Total Long-Term Liabilities	$11.38B	$55.68B	$12.46B
Total Liabilities	$30.30B	$106.9B	$31.06B
YoY Change	1.04%	253.96%	6.47%
SHAREHOLDERS EQUITY
Retained Earnings	$19.24B
YoY Change	18.15%
Common Stock	$30.00M	$30.00M	$31.00M
YoY Change	-3.23%	-3.23%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$7.517B
YoY Change	0.0%
Treasury Stock Shares
Shareholders Equity	$50.69B	$49.72B	$49.09B
YoY Change
Total Liabilities & Shareholders Equity	$158.8B	$156.6B	$156.8B
YoY Change	-3.73%	-3.61%	-0.55%

Cashflow Statement

Concept	2013 Q4	2013 Q3	2013 Q2
OPERATING ACTIVITIES
Net Income	$1.913B	$1.732B	$1.734B
YoY Change	26.02%	-18.03%	28.64%
Depreciation, Depletion And Amortization	$1.998B	$1.520B	$1.583B
YoY Change	0.76%	-1.87%	4.42%
Cash From Operating Activities	$2.481B	$3.994B	$3.316B
YoY Change	-31.37%	16.65%	-3.1%
INVESTING ACTIVITIES
Capital Expenditures	-$2.318B	$1.726B	$1.506B
YoY Change	16.54%	9.1%	17.02%
Acquisitions
YoY Change
Other Investing Activities	$131.0M	-$391.0M	-$429.0M
YoY Change	-1971.43%	-107.65%	-1259.46%
Cash From Investing Activities	-$2.187B	-$2.367B	-$2.197B
YoY Change	9.57%	-170.89%	48.45%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-179.0M	-1.413B	-1.569B
YoY Change	-141.34%	-4137.14%	-23.39%
NET CHANGE
Cash From Operating Activities	2.481B	3.994B	3.316B
Cash From Investing Activities	-2.187B	-2.367B	-2.197B
Cash From Financing Activities	-179.0M	-1.413B	-1.569B
Net Change In Cash	115.0M	214.0M	-450.0M
YoY Change	-94.4%	-96.85%	324.53%
FREE CASH FLOW
Cash From Operating Activities	$2.481B	$3.994B	$3.316B
Capital Expenditures	-$2.318B	$1.726B	$1.506B
Free Cash Flow	$4.799B	$2.268B	$1.810B
YoY Change	-14.36%	23.13%	-15.22%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2014Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	2333000000	USD
CY2014Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	10819000000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-19000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-181000000	USD
CY2014	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3873000000	USD
CY2013Q3	us-gaap	Net Income Loss NetIncomeLoss	1732000000	USD
CY2013Q4	us-gaap	Net Income Loss NetIncomeLoss	1913000000	USD
CY2013Q2	us-gaap	Revenues Revenues	16270000000	USD
CY2013	us-gaap	Interest Paid Net InterestPaidNet	2355000000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	366000000	USD
CY2012	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	4831000000	USD
CY2013	cmcsa	Other Operating And Administrative OtherOperatingAndAdministrative	18584000000	USD
CY2013	us-gaap	Investment Income Nonoperating InvestmentIncomeNonoperating	576000000	USD
CY2014	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	299000000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	6203000000	USD
CY2014	dei	Document Type DocumentType	10-K
CY2014	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2013Q4	us-gaap	Other Assets Current OtherAssetsCurrent	1480000000	USD
CY2014Q4	us-gaap	Indefinite Lived Franchise Rights IndefiniteLivedFranchiseRights	59364000000	USD
CY2013Q4	us-gaap	Assets Assets	158813000000	USD
CY2014Q4	us-gaap	Debt Current DebtCurrent	4217000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	31935000000	USD
CY2013Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	11384000000	USD
CY2014Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	21539000000	USD
CY2013Q4	us-gaap	Minority Interest MinorityInterest	364000000	USD
CY2014Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000	shares
CY2013Q4	us-gaap	Short Term Investments ShortTermInvestments	3573000000	USD
CY2013Q4	cmcsa	Redeemable Noncontrolling Interests And Redeemable Subsidiary Preferred Stock RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock	957000000	USD
CY2012	us-gaap	Interest Expense InterestExpense	2521000000	USD
CY2012	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	773000000	USD
CY2014	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1682000000	USD
CY2012	cmcsa	Programming And Production Costs ProgrammingAndProductionCosts	19929000000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	11115000000	USD
CY2013	cmcsa	Net Income Loss Attributable To Noncontrolling Interests And Redeemable Subsidiary Preferred Stock NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock	319000000	USD
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.56
CY2014	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	8178000000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-34000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	0	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	99000000	USD
CY2014	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	1122000000	USD
CY2013	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	99000000	USD
CY2012	cmcsa	Gain Loss On Investments And Noncash Other Income Expense Net GainLossOnInvestmentsAndNoncashOtherIncomeExpenseNet	1062000000	USD
CY2014	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	25000000	USD
CY2012	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	297000000	USD
CY2014	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	1093000000	USD
CY2012	cmcsa	Change In Current And Noncurrent Receivables Net ChangeInCurrentAndNoncurrentReceivablesNet	823000000	USD
CY2014	us-gaap	Payments Of Dividends PaymentsOfDividends	2254000000	USD
CY2013	us-gaap	Proceeds From Other Debt ProceedsFromOtherDebt	2933000000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	233000000	USD
CY2012	us-gaap	Payments Of Dividends PaymentsOfDividends	1608000000	USD
CY2014	cmcsa	Distributions To Noncontrolling Interests And Dividends For Redeemable Subsidiary Preferred Stock DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock	220000000	USD
CY2012	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	1736000000	USD
CY2013	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	98000000	USD
CY2013	cmcsa	Contributions From And Distributions To Noncontrolling Interests ContributionsFromAndDistributionsToNoncontrollingInterests	-136000000	USD
CY2014	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	118000000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-74000000	USD
CY2013Q4	cmcsa	Liabilities Related To Prepaid Forward Sale Agreements LiabilitiesRelatedToPrepaidForwardSaleAgreements	3611000000	USD
CY2012	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	39000000	shares
CY2014Q4	cmcsa	Amortization Of Original Film And Television Production Expected To Be Amortized During Next Fiscal Year AmortizationOfOriginalFilmAndTelevisionProductionExpectedToBeAmortizedDuringNextFiscalYear	1300000000	USD
CY2013	us-gaap	Impairment Of Investments ImpairmentOfInvestments	29000000	USD
CY2013	cmcsa	Mark To Market Adjustment On Derivative Component Of Prepaid Forward Sale Agreements MarkToMarketAdjustmentOnDerivativeComponentOfPrepaidForwardSaleAgreements	1604000000	USD
CY2014	us-gaap	Impairment Of Investments ImpairmentOfInvestments	50000000	USD
CY2014	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2014	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2014Q4	us-gaap	Other Assets Current OtherAssetsCurrent	1859000000	USD
CY2013Q4	us-gaap	Indefinite Lived Franchise Rights IndefiniteLivedFranchiseRights	59364000000	USD
CY2014Q4	cmcsa	Programming Rights Current ProgrammingRightsCurrent	839000000	USD
CY2013Q4	cmcsa	Accrued Participations And Residuals Current AccruedParticipationsAndResidualsCurrent	1239000000	USD
CY2014Q4	us-gaap	Minority Interest MinorityInterest	357000000	USD
CY2014Q4	us-gaap	Short Term Investments ShortTermInvestments	602000000	USD
CY2014Q4	cmcsa	Redeemable Noncontrolling Interests And Redeemable Subsidiary Preferred Stock RedeemableNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock	1066000000	USD
CY2014	cmcsa	Other Operating And Administrative OtherOperatingAndAdministrative	19862000000	USD
CY2014	cmcsa	Programming And Production Costs ProgrammingAndProductionCosts	20912000000	USD
CY2012	us-gaap	Depreciation Depreciation	6150000000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	11609000000	USD
CY2014	cmcsa	Net Income Loss Attributable To Noncontrolling Interests And Redeemable Subsidiary Preferred Stock NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock	212000000	USD
CY2014	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.2
CY2014	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	82000000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-14000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-27000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-9000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	301000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-29000000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	161000000	USD
CY2014	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	477000000	USD
CY2013	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	1009000000	USD
CY2014	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	191000000	USD
CY2014	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	167000000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	6826000000	USD
CY2014Q4	cmcsa	Cable Distribution Systems CableDistributionSystems	31655000000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	842000000	USD
CY2013Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	47847000000	USD
CY2014Q4	us-gaap	Debt Weighted Average Interest Rate DebtWeightedAverageInterestRate	0.0495	pure
CY2014Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	2558000000	USD
CY2014Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	55300000000	USD
CY2014Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	473000000	USD
CY2014Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	132000000	USD
CY2013Q4	us-gaap	Interest Rate Derivative Assets At Fair Value InterestRateDerivativeAssetsAtFairValue	110000000	USD
CY2013Q4	cmcsa	Derivative Fair Value Of Embedded Derivative Liability Component Of Prepaid Forward Sale Agreements And Indexed Debt Instruments DerivativeFairValueOfEmbeddedDerivativeLiabilityComponentOfPrepaidForwardSaleAgreementsAndIndexedDebtInstruments	2816000000	USD
CY2013	us-gaap	Severance Costs1 SeveranceCosts1	160000000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	68000000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	334000000	USD
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	8000000	shares
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	38.28
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.013	pure
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	11.11
CY2014	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	174000000	USD
CY2013	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	581000000	USD
CY2012	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	19000000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-106000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	116000000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	-36000000	USD
CY2012	cmcsa	Unrecognized Tax Benefits Increases Resulting From Acquired Subsidiaries UnrecognizedTaxBenefitsIncreasesResultingFromAcquiredSubsidiaries	0	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	524000000	USD
CY2014	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	153000000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-749000000	USD
CY2014	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	35000000	USD
CY2013	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	1345000000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-4037000000	USD
CY2013	cmcsa	Distributions To Noncontrolling Interests And Dividends For Redeemable Subsidiary Preferred Stock DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock	215000000	USD
CY2014	cmcsa	Equity Profit Loss EquityProfitLoss	8516000000	USD
CY2014	us-gaap	Advertising Cost Policy Expensed Advertising Cost AdvertisingCostPolicyExpensedAdvertisingCost	<div><p style='text-align:left;margin-top:0pt;margin-bottom:5.4pt;line-height:13pt;' ><font style='font-family:Helvetica;font-size:10pt;font-weight:bold;margin-left:0pt;' >Advertising Expenses</font></p><p style='text-align:left;margin-top:0pt;margin-bottom:5.4pt;line-height:13pt;' ><font style='font-family:Times New Roman;font-size:10pt;margin-left:0pt;' >Advertising costs are expensed as incurred. </font></p><p style='text-align:left;margin-top:0pt;margin-bottom:5.4pt;line-height:13pt;' ></p></div>
CY2013	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	40000000	shares
CY2014Q4	cmcsa	Expected Amortization Percentage Of Completed Not Released And Unamortized Film And Television Costs ExpectedAmortizationPercentageOfCompletedNotReleasedAndUnamortizedFilmAndTelevisionCosts	0.86	pure
CY2013Q4	us-gaap	Cost Method Investments CostMethodInvestments	2009000000	USD
CY2013	us-gaap	Unrealized Gain Loss On Securities UnrealizedGainLossOnSecurities	1601000000	USD
CY2012	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	30000000	USD
CY2013Q4	cmcsa	Obligations Under Prepaid Forward Sale Agreements ObligationsUnderPrepaidForwardSaleAgreements	811000000	USD
CY2013Q4	cmcsa	Customer Premise Equipment CustomerPremiseEquipment	25949000000	USD
CY2014Q4	cmcsa	Customer Premise Equipment CustomerPremiseEquipment	27086000000	USD
CY2014	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	227000000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1053000000	USD
CY2014Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	48234000000	USD
CY2014Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	4117000000	USD
CY2013Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	51800000000	USD
CY2014Q4	us-gaap	Interest Rate Derivative Assets At Fair Value InterestRateDerivativeAssetsAtFairValue	84000000	USD
CY2013Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	389000000	USD
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CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	8.8
CY2013	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	3183000000	USD
CY2013	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	200000000	USD
CY2014	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	0	USD
CY2014	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	-62000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	495000000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-220000000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	-448000000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	-3000000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	780000000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	434000000	USD
CY2012	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2841000000	USD
CY2014Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	452000000	USD
CY2014	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3668000000	USD
CY2013	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3946000000	USD
CY2012	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	85000000	USD
CY2013Q4	cmcsa	Film And Television Costs FilmAndTelevisionCosts	4994000000	USD
CY2014Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	5638000000	USD
CY2014Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	159339000000	USD
CY2013Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	158813000000	USD
CY2013	us-gaap	Costs And Expenses CostsAndExpenses	51094000000	USD
CY2012	us-gaap	Investment Income Nonoperating InvestmentIncomeNonoperating	219000000	USD
CY2012	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	688000000	USD
CY2013	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	64657000000	USD
CY2012	us-gaap	Sales Revenue Services Net SalesRevenueServicesNet	62570000000	USD
CY2014	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2014
CY2014Q4	us-gaap	Long Term Investments LongTermInvestments	3135000000	USD
CY2013Q4	us-gaap	Long Term Investments LongTermInvestments	3770000000	USD
CY2013	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-2448000000	USD
CY2014	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.24
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-95000000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-110000000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	USD
CY2013	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	7193000000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	8038000000	USD
CY2014	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	104000000	USD
CY2013	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	120000000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1486000000	USD
CY2014	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-504000000	USD
CY2014	us-gaap	Proceeds From Other Debt ProceedsFromOtherDebt	4182000000	USD
CY2013	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	2444000000	USD
CY2013	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-211000000	USD
CY2013	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	232000000	USD
CY2013	cmcsa	Equity Profit Loss EquityProfitLoss	6934000000	USD
CY2014Q3	us-gaap	Revenues Revenues	16791000000	USD
CY2014Q4	us-gaap	Revenues Revenues	17732000000	USD
CY2014Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.225
CY2014Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.225
CY2014Q4	cmcsa	Accrued Expenses And Other Current Liabilities Including Deferred Revenue AccruedExpensesAndOtherCurrentLiabilitiesIncludingDeferredRevenue	6208000000	USD
CY2014	dei	Entity Central Index Key EntityCentralIndexKey	0001166691
CY2013Q4	us-gaap	Assets Current AssetsCurrent	14075000000	USD
CY2014Q4	us-gaap	Goodwill Goodwill	27316000000	USD
CY2014Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	16980000000	USD
CY2013Q4	cmcsa	Programming Rights Current ProgrammingRightsCurrent	928000000	USD
CY2014Q4	us-gaap	Liabilities Current LiabilitiesCurrent	17410000000	USD
CY2013Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2014Q4	us-gaap	Treasury Stock Value TreasuryStockValue	7517000000	USD
CY2013Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	51058000000	USD
CY2013Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000	shares
CY2013Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	898000000	USD
CY2014	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	5078000000	USD
CY2012	us-gaap	Costs And Expenses CostsAndExpenses	50391000000	USD
CY2013	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1617000000	USD
CY2014	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	37000000	shares
CY2014Q4	cmcsa	Percentage Of Acquired Film And Television Libraries To Be Amortized In Next Three Years PercentageOfAcquiredFilmAndTelevisionLibrariesToBeAmortizedInNextThreeYears	0.51	pure
CY2013Q4	us-gaap	Marketable Securities MarketableSecurities	4345000000	USD
CY2013	cmcsa	Other Investment Income Loss Net OtherInvestmentIncomeLossNet	-13000000	USD
CY2012	us-gaap	Unrealized Gain Loss On Securities UnrealizedGainLossOnSecurities	1159000000	USD
CY2012	us-gaap	Impairment Of Investments ImpairmentOfInvestments	24000000	USD
CY2013	us-gaap	Equity Method Investment Other Than Temporary Impairment EquityMethodInvestmentOtherThanTemporaryImpairment	249000000	USD
CY2014Q4	us-gaap	Land Land	1112000000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	76363000000	USD
CY2014	us-gaap	Goodwill Other Changes GoodwillOtherChanges	-9000000	USD
CY2014Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	86514000000	USD
CY2013Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	85567000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	2000000	USD
CY2012	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-570000000	USD
CY2014	us-gaap	Investment Income Nonoperating InvestmentIncomeNonoperating	296000000	USD
CY2013	cmcsa	Programming And Production Costs ProgrammingAndProductionCosts	19670000000	USD
CY2013	us-gaap	Depreciation Depreciation	6254000000	USD
CY2014	us-gaap	Net Income Loss NetIncomeLoss	8380000000	USD
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.65
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-108000000	USD
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	2665000000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	2717000000	shares
CY2014Q4	cmcsa	Total Film And Television Costs And Programming Rights After Amortization TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization	6566000000	USD
CY2012	us-gaap	Investment Income Interest And Dividend InvestmentIncomeInterestAndDividend	119000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-38000000	USD
CY2014	us-gaap	Share Based Compensation ShareBasedCompensation	513000000	USD
CY2013	cmcsa	Gain Loss On Investments And Noncash Other Income Expense Net GainLossOnInvestmentsAndNoncashOtherIncomeExpenseNet	169000000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	371000000	USD
CY2014	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	171000000	USD
CY2013	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-85000000	USD
CY2013	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-667000000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	14854000000	USD
CY2014	cmcsa	Settlement Of Station Venture Liability SettlementOfStationVentureLiability	0	USD
CY2013	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-9233000000	USD
CY2012	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-90000000	USD
CY2012	cmcsa	Distributions To Noncontrolling Interests And Dividends For Redeemable Subsidiary Preferred Stock DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock	691000000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	167000000	USD
CY2012	cmcsa	Equity Profit Loss EquityProfitLoss	6351000000	USD
CY2012Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	49796000000	USD
CY2013	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	2046000000	USD
CY2014	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	2320000000	USD
CY2014	us-gaap	Stockholders Equity Other StockholdersEquityOther	29000000	USD
CY2013	us-gaap	Stockholders Equity Other StockholdersEquityOther	210000000	USD
CY2014Q4	cmcsa	Accrued Participations And Residuals Current AccruedParticipationsAndResidualsCurrent	1347000000	USD
CY2014Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	38805000000	USD
CY2014	dei	Trading Symbol TradingSymbol	cmcsa
CY2014	dei	Entity Registrant Name EntityRegistrantName	COMCAST CORP
CY2014Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	30953000000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	29840000000	USD
CY2013Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	5528000000	USD
CY2013Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	38890000000	USD
CY2014	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	97000000	USD
CY2014	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-215000000	USD
CY2013	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-86000000	USD
CY2014	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	12465000000	USD
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.6
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.32
CY2014Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	1619000000	USD
CY2014Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	0	USD
CY2014Q4	us-gaap	Fair Value Liabilities Measured On Recurring Basis Obligations FairValueLiabilitiesMeasuredOnRecurringBasisObligations	883000000	USD
CY2013Q4	us-gaap	Other Assets Fair Value Disclosure OtherAssetsFairValueDisclosure	81000000	USD
CY2013Q4	cmcsa	Equity Securities Held As Collateral EquitySecuritiesHeldAsCollateral	3959000000	USD
CY2013Q4	us-gaap	Land Land	1084000000	USD
CY2014Q4	us-gaap	Property Plant And Equipment Other PropertyPlantAndEquipmentOther	7860000000	USD
CY2013	us-gaap	Goodwill Other Changes GoodwillOtherChanges	71000000	USD
CY2014Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	2205000000	USD
CY2014Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	6500000000	USD
CY2012	cmcsa	Split Dollar Life Insurance Agreements Benefit Obligation SplitDollarLifeInsuranceAgreementsBenefitObligation	202000000	USD
CY2013	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	49000000	shares
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-45000000	USD
CY2014	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	414000000	USD
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	47.91
CY2014Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	24000000	shares
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.018	pure
CY2014	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	2708000000	USD
CY2013	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-16000000	USD
CY2013	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	15000000	USD
CY2012	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	-620000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	375000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Other DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther	3588000000	USD
CY2014	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	63000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	-3000000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	-32000000	USD
CY2014Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	6885000000	USD
CY2012	us-gaap	Interest Paid Net InterestPaidNet	2314000000	USD
CY2013Q4	us-gaap	Accounts Receivable Net Noncurrent AccountsReceivableNetNoncurrent	488000000	USD
CY2014	cmcsa	Programming And Talent Commitments Future Minimum Payments Due Thereafter ProgrammingAndTalentCommitmentsFutureMinimumPaymentsDueThereafter	26130000000	USD
CY2013	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	616000000	USD
CY2013	cmcsa	Split Dollar Life Insurance Agreement Expense SplitDollarLifeInsuranceAgreementExpense	50000000	USD
CY2012	cmcsa	Split Dollar Life Insurance Agreement Expense SplitDollarLifeInsuranceAgreementExpense	58000000	USD
CY2014Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-75000000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-37000000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	301000000	USD
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.022	pure
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.24	pure
CY2013	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	108000000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	3004000000	USD
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	3890000000	USD
CY2013	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	-103000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	3795000000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	3000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	177000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	59000000	USD
CY2014	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	33000000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	185000000	USD
CY2013	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	16000000	USD
CY2012	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	195000000	USD
CY2014	cmcsa	Proceeds From Sales Of Businesses And Investments ProceedsFromSalesOfBusinessesAndInvestments	666000000	USD
CY2014	cmcsa	Change In Current And Noncurrent Receivables Net ChangeInCurrentAndNoncurrentReceivablesNet	33000000	USD
CY2014	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	3175000000	USD
CY2014	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	4251000000	USD
CY2013	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2000000000	USD
CY2012	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	9331000000	USD
CY2012	cmcsa	Contributions From And Distributions To Noncontrolling Interests ContributionsFromAndDistributionsToNoncontrollingInterests	-169000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-202000000	USD
CY2014Q1	us-gaap	Net Income Loss NetIncomeLoss	1871000000	USD
CY2014Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.99
CY2014Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.225
CY2014Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1
CY2013Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	117000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	90000000	USD
CY2014Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	205000000	USD
CY2013Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	6972000000	USD
CY2013Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	509000000	USD
CY2014Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	359000000	USD
CY2014Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	299000000	USD
CY2014Q4	us-gaap	Cost Method Investments CostMethodInvestments	2056000000	USD
CY2013	us-gaap	Realized Investment Gains Losses RealizedInvestmentGainsLosses	484000000	USD
CY2012	cmcsa	Other Investment Income Loss Net OtherInvestmentIncomeLossNet	-6000000	USD
CY2014	cmcsa	Mark To Market Adjustment On Derivative Component Of Prepaid Forward Sale Agreements MarkToMarketAdjustmentOnDerivativeComponentOfPrepaidForwardSaleAgreements	56000000	USD
CY2013Q4	cmcsa	Cable Distribution Systems CableDistributionSystems	30498000000	USD
CY2013Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	-8874000000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	-10170000000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	1457000000	USD
CY2014Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	1296000000	USD
CY2014Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	4217000000	USD
CY2014Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	3530000000	USD
CY2014Q4	us-gaap	Trading Securities TradingSecurities	523000000	USD
CY2013Q4	us-gaap	Fair Value Liabilities Measured On Recurring Basis Obligations FairValueLiabilitiesMeasuredOnRecurringBasisObligations	747000000	USD
CY2014Q4	us-gaap	Other Liabilities Fair Value Disclosure OtherLiabilitiesFairValueDisclosure	8000000	USD
CY2014	cmcsa	Split Dollar Life Insurance Agreements Benefit Obligation SplitDollarLifeInsuranceAgreementsBenefitObligation	217000000	USD
CY2014	cmcsa	Number Of Votes Entitled Of Each Class B Common Stock NumberOfVotesEntitledOfEachClassBCommonStock	15	pure
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	16000000	shares
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.25	pure
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.29	pure
CY2014	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	2392000000	USD
CY2012	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	169000000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	3605000000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	432000000	USD
CY2013	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-313000000	USD
CY2014Q2	us-gaap	Net Income Loss NetIncomeLoss	1992000000	USD
CY2014Q3	us-gaap	Net Income Loss NetIncomeLoss	2592000000	USD
CY2014Q4	cmcsa	Other Stockholders Equity OtherStockholdersEquity	52681000000	USD
CY2013Q4	cmcsa	Accrued Expenses And Other Current Liabilities Including Deferred Revenue AccruedExpensesAndOtherCurrentLiabilitiesIncludingDeferredRevenue	8865000000	USD
CY2014Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	448000000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	-287000000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1701000000	USD
CY2013Q4	cmcsa	Returns And Incentives Allowance ReturnsAndIncentivesAllowance	375000000	USD
CY2013Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	221000000	USD
CY2012Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	430000000	USD
CY2013Q4	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	0.195
CY2014Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	253000000	USD
CY2014Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	197000000	USD
CY2014Q4	us-gaap	Net Income Loss NetIncomeLoss	1925000000	USD
CY2014	us-gaap	Depreciation And Amortization DepreciationAndAmortization	8019000000	USD
CY2014Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.75
CY2013Q4	us-gaap	Common Stock Value CommonStockValue	30000000	USD
CY2013Q4	cmcsa	Other Stockholders Equity OtherStockholdersEquity	50664000000	USD
CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1718000000	USD
CY2014	cmcsa	Payments For Acquisitions And Construction Of Real Estate Properties PaymentsForAcquisitionsAndConstructionOfRealEstateProperties	43000000	USD
CY2013	cmcsa	Payments For Acquisitions And Construction Of Real Estate Properties PaymentsForAcquisitionsAndConstructionOfRealEstateProperties	1904000000	USD
CY2012	cmcsa	Payments For Acquisitions And Construction Of Real Estate Properties PaymentsForAcquisitionsAndConstructionOfRealEstateProperties	0	USD
CY2013	us-gaap	Payments To Acquire Additional Interest In Subsidiaries PaymentsToAcquireAdditionalInterestInSubsidiaries	10761000000	USD
CY2012	us-gaap	Payments To Acquire Additional Interest In Subsidiaries PaymentsToAcquireAdditionalInterestInSubsidiaries	0	USD
CY2012	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	0	USD
CY2013	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	12000000	USD
CY2014	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	23000000	USD
CY2013	us-gaap	Depreciation And Amortization DepreciationAndAmortization	7871000000	USD
CY2014	cmcsa	Operating Income Excluding Depreciation And Amortization OperatingIncomeExcludingDepreciationAndAmortization	22923000000	USD
CY2012	cmcsa	Operating Income Excluding Depreciation And Amortization OperatingIncomeExcludingDepreciationAndAmortization	19977000000	USD
CY2012	us-gaap	Depreciation And Amortization DepreciationAndAmortization	7798000000	USD
CY2014	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	7420000000	USD
CY2013	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	6596000000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	5714000000	USD
CY2013	cmcsa	Settlement Of Station Venture Liability SettlementOfStationVentureLiability	602000000	USD
CY2012	cmcsa	Settlement Of Station Venture Liability SettlementOfStationVentureLiability	0	USD
CY2012	us-gaap	Proceeds From Other Debt ProceedsFromOtherDebt	4544000000	USD
CY2014	us-gaap	Description Of New Accounting Pronouncements Not Yet Adopted DescriptionOfNewAccountingPronouncementsNotYetAdopted	<div><p style='text-align:left;margin-top:0pt;margin-bottom:5.4pt;line-height:15pt;' ><font style='font-family:Helvetica;font-size:12pt;font-weight:bold;margin-left:0pt;' >Note 3: Recent Accounting Pronouncements</font></p><p style='text-align:left;margin-top:0pt;margin-bottom:5.4pt;line-height:13pt;' ><font style='font-family:Helvetica;font-size:10pt;font-weight:bold;margin-left:0pt;' >Discontinued Operations</font></p><p style='text-align:left;margin-top:0pt;margin-bottom:5.4pt;line-height:13pt;' ><font style='font-family:Times New Roman;font-size:10pt;margin-left:0pt;' >In </font><font style='font-family:Times New Roman;font-size:10pt;' >April</font><font style='font-family:Times New Roman;font-size:10pt;' > 20</font><font style='font-family:Times New Roman;font-size:10pt;' >14</font><font style='font-family:Times New Roman;font-size:10pt;' >, the F</font><font style='font-family:Times New Roman;font-size:10pt;' >inancial </font><font style='font-family:Times New Roman;font-size:10pt;' >A</font><font style='font-family:Times New Roman;font-size:10pt;' >ccounting </font><font style='font-family:Times New Roman;font-size:10pt;' >S</font><font style='font-family:Times New Roman;font-size:10pt;' >tandards </font><font style='font-family:Times New Roman;font-size:10pt;' >B</font><font style='font-family:Times New Roman;font-size:10pt;' >oard (“FASB”) updated the accounting guidance related to discontinued operations. The updated accounting guidance provides a narrower</font><font style='font-family:Times New Roman;font-size:10pt;' > definition of discontinued operations than existing GAAP. The updated accounting guidance requires that only disposals of components of an entity, or groups of components, that represent a strategic shift that has or will have a material effect on the rep</font><font style='font-family:Times New Roman;font-size:10pt;' >orting entity’s operations be reported in the financial statements as discontinued operations</font><font style='font-family:Times New Roman;font-size:10pt;' >.</font><font style='font-family:Times New Roman;font-size:10pt;' > The updated accounting guidance also provides guidance on the financial statement presentations and disclosures of discontinued operations. The updated accountin</font><font style='font-family:Times New Roman;font-size:10pt;' >g guidance will be effective prospectively for us on January 1, 2015.</font></p><p style='text-align:left;margin-top:0pt;margin-bottom:5.4pt;line-height:13pt;' ><font style='font-family:Helvetica;font-size:10pt;font-weight:bold;margin-left:0pt;' >Revenue Recognition</font></p><p style='text-align:left;margin-top:0pt;margin-bottom:5.4pt;line-height:13pt;' ><font style='font-family:Times New Roman;font-size:10pt;margin-left:0pt;' >In May 2014, the FASB and the International Accounting Standards Board updated the accounting guidance related to revenue recognition. The updated accounting guidance</font><font style='font-family:Times New Roman;font-size:10pt;' > provides a single, contract-based revenue recognition model to help improve financial reporting by providing clearer guidance on when an entity should recognize revenue, and by reducing the number of standards to which entities have to refer. The updated </font><font style='font-family:Times New Roman;font-size:10pt;' >accounting guidance will be effective for us on January 1, 2017, and early adoption is not permitted. The updated accounting guidance </font><font style='font-family:Times New Roman;font-size:10pt;' >provides</font><font style='font-family:Times New Roman;font-size:10pt;' > </font><font style='font-family:Times New Roman;font-size:10pt;' >companies with </font><font style='font-family:Times New Roman;font-size:10pt;' >alternative methods of adoption</font><font style='font-family:Times New Roman;font-size:10pt;' >. We are currently in the process of determining the impact that the upd</font><font style='font-family:Times New Roman;font-size:10pt;' >ated accounting guidance will have on our consolidated financial statements and our method of adoption.</font></p></div>
CY2012	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0	USD
CY2012	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	0	USD
CY2014	us-gaap	Revenues Revenues	68775000000	USD
CY2012	us-gaap	Revenues Revenues	62570000000	USD
CY2014	us-gaap	Operating Income Loss OperatingIncomeLoss	14904000000	USD
CY2013	us-gaap	Operating Income Loss OperatingIncomeLoss	13563000000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	12179000000	USD
CY2013Q1	cmcsa	Noncontrolling Interest Acquired NoncontrollingInterestAcquired	0.49	pure
CY2012	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	757000000	USD
CY2013	cmcsa	Consideration Transferred To Acquire Additional Interest In Subsidiaries ConsiderationTransferredToAcquireAdditionalInterestInSubsidiaries	16700000000	USD
CY2014	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	797000000	USD
CY2014Q4	us-gaap	Dividends Payable Current And Noncurrent DividendsPayableCurrentAndNoncurrent	572000000	USD
CY2014Q4	us-gaap	Dividends Payable Amount Per Share DividendsPayableAmountPerShare	0.225
CY2012	us-gaap	Stockholders Equity Other StockholdersEquityOther	-76000000	USD
CY2013Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	3647000000	USD
CY2013Q1	us-gaap	Net Income Loss NetIncomeLoss	1437000000	USD
CY2013Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	3414000000	USD
CY2013Q4	us-gaap	Revenues Revenues	16926000000	USD
CY2013Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	3067000000	USD
CY2013Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	3435000000	USD
CY2013	cmcsa	Purchase Of Noncontrolling Common Equity Interest PurchaseOfNoncontrollingCommonEquityInterest	-1677000000	USD
CY2014	cmcsa	Noncontrolling Interest Increase From Equity Issuance Or Sale Of Parent Equity Interest NoncontrollingInterestIncreaseFromEquityIssuanceOrSaleOfParentEquityInterest	11000000	USD
CY2014Q4	cmcsa	Company Shares Exchanged For Each Acquiree Share CompanySharesExchangedForEachAcquireeShare	2.875	pure
CY2012	us-gaap	Asset Impairment Charges AssetImpairmentCharges	161000000	USD
CY2014Q4	cmcsa	Totalcustomerrelationships Totalcustomerrelationships	27000000
CY2014	cmcsa	Noncash Interest Expense Income Net NoncashInterestExpenseIncomeNet	180000000	USD
CY2013	cmcsa	Noncash Interest Expense Income Net NoncashInterestExpenseIncomeNet	167000000	USD
CY2012	cmcsa	Noncash Interest Expense Income Net NoncashInterestExpenseIncomeNet	193000000	USD
CY2014	cmcsa	Film And Television Costs Net FilmAndTelevisionCostsNet	562000000	USD
CY2013	cmcsa	Film And Television Costs Net FilmAndTelevisionCostsNet	-44000000	USD
CY2012	cmcsa	Film And Television Costs Net FilmAndTelevisionCostsNet	-22000000	USD
CY2013	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	42000000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1620000000	USD
CY2013Q3	us-gaap	Revenues Revenues	16151000000	USD
CY2013Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.195
CY2013Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.195
CY2013Q2	us-gaap	Net Income Loss NetIncomeLoss	1734000000	USD
CY2013Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.55
CY2013Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.66
CY2013Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.66
CY2013Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.73
CY2013Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.54
CY2013Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.65
CY2013Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.65
CY2013Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.72
CY2013Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.195
CY2013Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.195
CY2014	us-gaap	Income Tax Effects Allocated Directly To Equity Other IncomeTaxEffectsAllocatedDirectlyToEquityOther	299000000	USD
CY2013	us-gaap	Income Tax Effects Allocated Directly To Equity Other IncomeTaxEffectsAllocatedDirectlyToEquityOther	244000000	USD
CY2012	us-gaap	Income Tax Effects Allocated Directly To Equity Other IncomeTaxEffectsAllocatedDirectlyToEquityOther	164000000	USD
CY2013Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	35494000000	USD
CY2014Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	36336000000	USD
CY2014	us-gaap	Multiemployer Plans Funded Status MultiemployerPlansFundedStatus	At least 80 percent
CY2013Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	1250000000	USD
CY2014Q4	us-gaap	Accounts Receivable Net Noncurrent AccountsReceivableNetNoncurrent	569000000	USD
CY2013Q1	us-gaap	Revenues Revenues	15310000000	USD
CY2013	cmcsa	Consideration Transferred Related To Redemption Transaction By Funding Source ConsiderationTransferredRelatedToRedemptionTransactionByFundingSource	725000000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1435000000	USD
CY2013Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	4536000000	USD
CY2014Q4	us-gaap	Assets Fair Value Disclosure AssetsFairValueDisclosure	810000000	USD
CY2013Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	4263000000	USD
CY2014Q4	us-gaap	Liabilities Fair Value Disclosure LiabilitiesFairValueDisclosure	1896000000	USD
CY2014	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount	3250000000	USD
CY2014	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	P5Y0M0D
CY2013	cmcsa	Fair Value Equity Securities Settlement FairValueEquitySecuritiesSettlement	1400000000	USD
CY2014	cmcsa	Fair Value Equity Securities Settlement FairValueEquitySecuritiesSettlement	3200000000	USD
CY2014	us-gaap	Use Of Estimates UseOfEstimates	<div><p style='text-align:left;margin-top:0pt;margin-bottom:5.4pt;line-height:13pt;' ><font style='font-family:Times New Roman;font-size:10pt;margin-left:0pt;' >Our consolidated financial statements are prepared in accordance with GAAP, which requires us to select accounting policies, including in certain cases industry-specific policies, and make estimates that affect the </font><font style='font-family:Times New Roman;font-size:10pt;' >reported amount of assets, liabilities, revenue and expenses, and the related disclosure of contingent assets and contingent liabilities. Actual results could differ from these estimates. We believe that the judgments and related estimates for the followin</font><font style='font-family:Times New Roman;font-size:10pt;' >g items are critical in the preparation of our consolidated financial statements:</font></p><ul><li style='list-style:disc;text-align:left;margin-top:0pt;margin-bottom:5.4pt;' ><font style='font-family:Times New Roman;font-size:10pt;' >valuation and impairment testing of cable franchise rights (see Note 9)</font></li><li style='list-style:disc;text-align:left;margin-top:0pt;margin-bottom:5.4pt;' ><font style='font-family:Times New Roman;font-size:10pt;' >film and television costs (see Note 6)</font></li><li style='list-style:disc;text-align:left;margin-top:0pt;margin-bottom:5.4pt;' ><font style='font-family:Times New Roman;font-size:10pt;' >income taxes (see Note 15)</font></li></ul><p style='text-align:left;margin-top:0pt;margin-bottom:5.4pt;line-height:13pt;' ><font style='font-family:Times New Roman;font-size:10pt;margin-left:0pt;' >In addition, the f</font><font style='font-family:Times New Roman;font-size:10pt;' >ollowing accounting </font><font style='font-family:Times New Roman;font-size:10pt;' >policies are specific to the industries in which we operate:</font></p><ul><li style='list-style:disc;text-align:left;margin-top:0pt;margin-bottom:5.4pt;' ><font style='font-family:Times New Roman;font-size:10pt;' >capitalization and amortization of film and television costs (see Note 6)</font></li><li style='list-style:disc;text-align:left;margin-top:0pt;margin-bottom:5.4pt;' ><font style='font-family:Times New Roman;font-size:10pt;' >installation costs for connecting customers to our cable systems (see Note 8)</font></li></ul><p style='text-align:left;margin-top:0pt;margin-bottom:5.4pt;line-height:13pt;' ><font style='font-family:Times New Roman;font-size:10pt;margin-left:0pt;' >Information</font><font style='font-family:Times New Roman;font-size:10pt;' > on our other accounting policies or methods related to our consolidated financial statements </font><font style='font-family:Times New Roman;font-size:10pt;' >are</font><font style='font-family:Times New Roman;font-size:10pt;' > included, where applicable, in their respective footnotes that follow. </font><font style='font-family:Times New Roman;font-size:10pt;' >Below is a discussion of accounting policies and methods used in our consolidated finan</font><font style='font-family:Times New Roman;font-size:10pt;' >cial statements that are not presented within other footnotes.</font></p><p style='text-align:left;margin-top:5.4pt;margin-bottom:5.4pt;line-height:13pt;' ></p></div>
CY2014Q4	cmcsa	Percentage Of Employees Covered Under Collective Bargaining Agreements Expired Or Scheduled To Expire During Next Year PercentageOfEmployeesCoveredUnderCollectiveBargainingAgreementsExpiredOrScheduledToExpireDuringNextYear	0.3	pure
CY2014	us-gaap	Debt Instrument Basis Spread On Variable Rate1 DebtInstrumentBasisSpreadOnVariableRate1	0.01	pure
CY2013Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	42574000000	USD
CY2014Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	45410000000	USD
CY2014Q3	cmcsa	Change In Income Tax Expense Related To Effectively Settled Uncertain Tax Positions ChangeInIncomeTaxExpenseRelatedToEffectivelySettledUncertainTaxPositions	724000000	USD
CY2013Q4	us-gaap	Commercial Paper CommercialPaper	1350000000	USD
CY2014Q4	us-gaap	Commercial Paper CommercialPaper	845000000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	31699000000	USD
CY2014Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	32764000000	USD

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2013 Q4 Form 10-K Financial Statement

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2013 Q4 Form 10-K Financial Statement

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$CMCSA
COMCAST CORP Stock $cmcsa