$CMCSA
COMCAST CORP Stock $cmcsa

$cmcsa Overview Financials Valuation SEC Filings Company Website

2018 Form 10-K Financial Statement

#000116669119000005 Filed on January 31, 2019

Income Statement

Concept	2018	2017 Q4	2017 Q3
Revenue	$94.51B	$22.08B	$21.08B
YoY Change	11.15%	4.99%	-1.12%
Cost Of Revenue	$29.69B	$6.905B	$6.059B
YoY Change	17.11%	5.63%	-13.48%
Gross Profit	$64.82B	$15.17B	$15.02B
YoY Change	8.62%	4.71%	4.93%
Gross Profit Margin	68.58%	68.72%	71.26%
Selling, General & Admin	$35.01B	$8.432B	$7.889B
YoY Change	10.36%	9.11%	5.45%
% of Gross Profit	54.01%	55.58%	52.52%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$8.281B	$2.609B	$1.991B
YoY Change	4.64%	4.53%	6.76%
% of Gross Profit	12.78%	17.2%	13.25%
Operating Expenses	$46.02B	$11.04B	$10.44B
YoY Change	9.97%	7.99%	5.66%
Operating Profit	$19.01B	$4.129B	$4.779B
YoY Change	5.5%	-3.17%	7.64%
Interest Expense	$3.542B	-$729.0M	$766.0M
YoY Change	14.78%	-3.83%	2.0%
% of Operating Profit	18.63%	-17.66%	16.03%
Other Income/Expense, Net	-$225.0M	$44.00M	$70.00M
YoY Change	-153.44%	-81.36%	-109.78%
Pretax Income	$15.24B	$3.444B	$4.083B
YoY Change	-0.72%	-7.82%	9.64%
Income Tax	$3.380B	$1.075B	$1.409B
% Of Pretax Income	22.18%	31.21%	34.51%
Net Earnings	$11.73B	$15.00B	$2.642B
YoY Change	-48.4%	553.27%	18.1%
Net Earnings / Revenue	12.41%	67.95%	12.53%
Basic Earnings Per Share	$2.56	$3.22	$0.56
Diluted Earnings Per Share	$2.53	$3.17	$0.55
COMMON SHARES
Basic Shares Outstanding	4.584B shares		4.698B shares
Diluted Shares Outstanding	4.640B shares		4.777B shares

Balance Sheet

Concept	2018	2017 Q4	2017 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments	$3.814B	$4.025B	$4.705B
YoY Change	11.26%	15.03%	58.26%
Cash & Equivalents	$3.814B	$3.428B	$4.114B
Short-Term Investments		$597.0M	$591.0M
Other Short-Term Assets	$6.930B	$2.468B	$2.152B
YoY Change	69.81%	18.48%	-38.85%
Inventory
Prepaid Expenses
Receivables	$11.10B	$8.834B	$7.915B
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$21.85B	$16.34B	$15.96B
YoY Change	33.68%	-0.11%	4.81%
LONG-TERM ASSETS
Property, Plant & Equipment	$44.44B	$38.47B	$37.86B
YoY Change	15.51%	6.12%	6.17%
Goodwill		$36.78B	$36.75B
YoY Change		2.22%	0.27%
Intangibles
YoY Change
Long-Term Investments	$7.883B	$3.546B	$3.351B
YoY Change	13.74%	49.24%	176.49%
Other Assets	$4.403B	$4.354B	$3.145B
YoY Change	1.13%	57.24%	18.32%
Total Long-Term Assets	$229.8B	$171.1B	$169.3B
YoY Change	34.31%	4.25%	4.08%
TOTAL ASSETS
Total Short-Term Assets	$21.85B	$16.34B	$15.96B
Total Long-Term Assets	$229.8B	$171.1B	$169.3B
Total Assets	$251.7B	$187.5B	$185.3B
YoY Change	34.26%	3.86%	4.15%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$8.494B	$6.908B	$6.976B
YoY Change	22.96%	-0.1%	5.79%
Accrued Expenses	$12.53B	$6.620B	$5.849B
YoY Change	51.61%	5.38%	12.46%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$4.398B	$5.134B	$5.241B
YoY Change	-14.34%	-6.31%	57.25%
Total Short-Term Liabilities	$27.60B	$21.99B	$21.45B
YoY Change	25.51%	2.13%	18.91%
LONG-TERM LIABILITIES
Long-Term Debt	$107.3B	$59.42B	$59.72B
YoY Change	80.65%	6.94%	4.6%
Other Long-Term Liabilities	$15.33B	$10.97B	$10.91B
YoY Change	39.71%	0.43%	-1.84%
Total Long-Term Liabilities	$122.7B	$10.97B	$10.91B
YoY Change	74.27%	0.43%	-1.84%
TOTAL LIABILITIES
Total Short-Term Liabilities	$27.60B	$21.99B	$21.45B
Total Long-Term Liabilities	$122.7B	$10.97B	$10.91B
Total Liabilities	$180.1B	$32.97B	$32.36B
YoY Change	51.52%	1.56%	11.0%
SHAREHOLDERS EQUITY
Retained Earnings		$38.20B	$24.98B
YoY Change		65.55%	10.97%
Common Stock		$55.00M	$55.00M
YoY Change		-1.79%	96.43%
Preferred Stock
YoY Change
Treasury Stock (at cost)		$7.517B	$7.517B
YoY Change		0.0%	0.0%
Treasury Stock Shares
Shareholders Equity	$71.61B	$68.62B	$55.43B
YoY Change
Total Liabilities & Shareholders Equity	$251.7B	$187.5B	$185.3B
YoY Change	34.26%	3.86%	4.15%

Cashflow Statement

Concept	2018	2017 Q4	2017 Q3
OPERATING ACTIVITIES
Net Income	$11.73B	$15.00B	$2.642B
YoY Change	-48.4%	553.27%	18.1%
Depreciation, Depletion And Amortization	$8.281B	$2.609B	$1.991B
YoY Change	4.64%	4.53%	6.76%
Cash From Operating Activities	$24.30B	$5.404B	$5.108B
YoY Change	14.28%	-5.9%	37.94%
INVESTING ACTIVITIES
Capital Expenditures	$9.774B	-$3.180B	$2.434B
YoY Change	2.35%	2.71%	1.16%
Acquisitions	$38.22B
YoY Change	7084.02%
Other Investing Activities	-$650.0M	-$430.0M	$283.0M
YoY Change	-17.2%	-62.18%	-105.15%
Cash From Investing Activities	-$50.85B	-$3.610B	-$2.516B
YoY Change	275.78%	-14.72%	-69.77%
FINANCING ACTIVITIES
Cash Dividend Paid	$3.352B
YoY Change	16.27%
Common Stock Issuance & Retirement, Net	$5.320B
YoY Change	-2.12%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$27.14B	-2.451B	-1.186B
YoY Change	-458.43%	141.24%	-142.92%
NET CHANGE
Cash From Operating Activities	$24.30B	5.404B	5.108B
Cash From Investing Activities	-$50.85B	-3.610B	-2.516B
Cash From Financing Activities	$27.14B	-2.451B	-1.186B
Net Change In Cash	$338.0M	-657.0M	1.406B
YoY Change	116.67%	-233.0%	-175.67%
FREE CASH FLOW
Cash From Operating Activities	$24.30B	$5.404B	$5.108B
Capital Expenditures	$9.774B	-$3.180B	$2.434B
Free Cash Flow	$14.52B	$8.584B	$2.674B
YoY Change	24.01%	-2.88%	106.17%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2017Q4	cmcsa	Debtissuancecostspremiumsdiscountsadjustments Debtissuancecostspremiumsdiscountsadjustments	1943000000	USD
CY2018Q4	cmcsa	Debtissuancecostspremiumsdiscountsadjustments Debtissuancecostspremiumsdiscountsadjustments	1702000000	USD
CY2017	cmcsa	Contributions From And Distributions To Noncontrolling Interests ContributionsFromAndDistributionsToNoncontrollingInterests	-108000000	USD
CY2018	cmcsa	Contributions From And Distributions To Noncontrolling Interests ContributionsFromAndDistributionsToNoncontrollingInterests	294000000	USD
CY2017Q4	cmcsa	Accrued Participations And Residuals Current AccruedParticipationsAndResidualsCurrent	1644000000	USD
CY2018Q4	cmcsa	Accrued Participations And Residuals Current AccruedParticipationsAndResidualsCurrent	1808000000	USD
CY2016	cmcsa	Acquisition Related Expenses AcquisitionRelatedExpenses	0	USD
CY2017	cmcsa	Acquisition Related Expenses AcquisitionRelatedExpenses	0	USD
CY2018	cmcsa	Acquisition Related Expenses AcquisitionRelatedExpenses	355000000	USD
CY2016	cmcsa	Adjusted Ebitda AdjustedEBITDA	26257000000	USD
CY2017	cmcsa	Adjusted Ebitda AdjustedEBITDA	27956000000	USD
CY2018	cmcsa	Adjusted Ebitda AdjustedEBITDA	30165000000	USD
CY2017	cmcsa	Business Acquisition Pro Forma Net Income Loss Attributable To Parent BusinessAcquisitionProFormaNetIncomeLossAttributableToParent	22308000000	USD
CY2018	cmcsa	Business Acquisition Pro Forma Net Income Loss Attributable To Parent BusinessAcquisitionProFormaNetIncomeLossAttributableToParent	11365000000	USD
CY2016Q4	cmcsa	Capital Contribution Accrued But Not Yet Paid CapitalContributionAccruedButNotYetPaid	447000000	USD
CY2018Q4	cmcsa	Carrying Value Of Contractual Obligation CarryingValueOfContractualObligation	1100000000	USD
CY2016	cmcsa	Change In Current And Noncurrent Receivables Net ChangeInCurrentAndNoncurrentReceivablesNet	649000000	USD
CY2017	cmcsa	Change In Current And Noncurrent Receivables Net ChangeInCurrentAndNoncurrentReceivablesNet	869000000	USD
CY2018	cmcsa	Change In Current And Noncurrent Receivables Net ChangeInCurrentAndNoncurrentReceivablesNet	802000000	USD
CY2018	cmcsa	Change In Net Deferred Tax Liability Related To Acquisitions ChangeInNetDeferredTaxLiabilityRelatedToAcquisitions	1900000000	USD
CY2018	cmcsa	Changes In Net Deferred Tax Liability Related To Other Comprehensive Income ChangesInNetDeferredTaxLiabilityRelatedToOtherComprehensiveIncome	72000000	USD
CY2018Q4	cmcsa	Contractual Valueofa Potential Future Obligation ContractualValueofaPotentialFutureObligation	1600000000	USD
CY2016	cmcsa	Contributions From And Distributions To Noncontrolling Interests ContributionsFromAndDistributionsToNoncontrollingInterests	-134000000	USD
CY2017	cmcsa	Decrease In Deferred Tax Liabilities2017 Tax Reform Enactment DecreaseInDeferredTaxLiabilities2017TaxReformEnactment	12400000000	USD
CY2017	cmcsa	Decrease In Deferred Tax Liabilities Foreign Taxes2017 Tax Reformenactment DecreaseInDeferredTaxLiabilitiesForeignTaxes2017TaxReformenactment	382000000	USD
CY2017Q4	cmcsa	Deferred Tax Liabilities Long Term Debt DeferredTaxLiabilitiesLongTermDebt	673000000	USD
CY2018Q4	cmcsa	Deferred Tax Liabilities Long Term Debt DeferredTaxLiabilitiesLongTermDebt	604000000	USD
CY2017Q4	cmcsa	Deferred Tax Liabilities Property Plant And Equipment And Intangible Assets DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndIntangibleAssets	25223000000	USD
CY2018Q4	cmcsa	Deferred Tax Liabilities Property Plant And Equipment And Intangible Assets DeferredTaxLiabilitiesPropertyPlantAndEquipmentAndIntangibleAssets	29139000000	USD
CY2018Q4	cmcsa	Deferred Tax Liability Franchise Rights DeferredTaxLiabilityFranchiseRights	15000000000	USD
CY2017Q4	cmcsa	Deferred Tax Liability Investments DeferredTaxLiabilityInvestments	466000000	USD
CY2018Q4	cmcsa	Deferred Tax Liability Investments DeferredTaxLiabilityInvestments	491000000	USD
CY2018	cmcsa	Deferred Tax Related To Purchase Of Noncontrolling Interest DeferredTaxRelatedToPurchaseOfNoncontrollingInterest	-42000000	USD
CY2016	cmcsa	Deposit Deposit	1749000000	USD
CY2017	cmcsa	Deposit Deposit	0	USD
CY2018	cmcsa	Deposit Deposit	0	USD
CY2016	cmcsa	Depreciation And Amortization And Gain Loss On Disposition Of Assets DepreciationAndAmortizationAndGainLossOnDispositionOfAssets	9426000000	USD
CY2017	cmcsa	Depreciation And Amortization And Gain Loss On Disposition Of Assets DepreciationAndAmortizationAndGainLossOnDispositionOfAssets	9688000000	USD
CY2018	cmcsa	Depreciation And Amortization And Gain Loss On Disposition Of Assets DepreciationAndAmortizationAndGainLossOnDispositionOfAssets	10676000000	USD
CY2017Q4	cmcsa	Directto Television Film Costs In Productionand In Development DirecttoTelevisionFilmCostsInProductionandInDevelopment	818000000	USD
CY2018Q4	cmcsa	Directto Television Film Costs In Productionand In Development DirecttoTelevisionFilmCostsInProductionandInDevelopment	953000000	USD
CY2016	cmcsa	Distributions To Noncontrolling Interests And Dividends For Redeemable Subsidiary Preferred Stock DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock	253000000	USD
CY2017	cmcsa	Distributions To Noncontrolling Interests And Dividends For Redeemable Subsidiary Preferred Stock DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock	252000000	USD
CY2018	cmcsa	Distributions To Noncontrolling Interests And Dividends For Redeemable Subsidiary Preferred Stock DistributionsToNoncontrollingInterestsAndDividendsForRedeemableSubsidiaryPreferredStock	277000000	USD
CY2016	cmcsa	Effective Income Tax Rate Reconciliation2017taxreformlegislation EffectiveIncomeTaxRateReconciliation2017taxreformlegislation	0	USD
CY2018	cmcsa	Net Income Loss Attributable To Noncontrolling Interests And Redeemable Subsidiary Preferred Stock NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock	131000000	USD
CY2016	cmcsa	Net Transactions With Affiliates NetTransactionsWithAffiliates	0	USD
CY2017	cmcsa	Net Transactions With Affiliates NetTransactionsWithAffiliates	0	USD
CY2018	cmcsa	Net Transactions With Affiliates NetTransactionsWithAffiliates	0	USD
CY2017Q4	cmcsa	Effective Income Tax Rate Reconciliation2017taxreformlegislation EffectiveIncomeTaxRateReconciliation2017taxreformlegislation	12700000000	USD
CY2017	cmcsa	Effective Income Tax Rate Reconciliation2017taxreformlegislation EffectiveIncomeTaxRateReconciliation2017taxreformlegislation	12682000000	USD
CY2018	cmcsa	Effective Income Tax Rate Reconciliation2017taxreformlegislation EffectiveIncomeTaxRateReconciliation2017taxreformlegislation	120000000	USD
CY2016	cmcsa	Equity Profit Loss EquityProfitLoss	8935000000	USD
CY2017	cmcsa	Equity Profit Loss EquityProfitLoss	22849000000	USD
CY2018	cmcsa	Equity Profit Loss EquityProfitLoss	11804000000	USD
CY2017Q4	cmcsa	Film And Television Costs FilmAndTelevisionCosts	7087000000	USD
CY2018Q4	cmcsa	Film And Television Costs FilmAndTelevisionCosts	7837000000	USD
CY2018Q4	cmcsa	Film And Television Library Costs Unamortized FilmAndTelevisionLibraryCostsUnamortized	396000000	USD
CY2016	cmcsa	Gain Loss On Investments And Other Noncash Income Loss Net GainLossOnInvestmentsAndOtherNoncashIncomeLossNet	-19000000	USD
CY2017	cmcsa	Gain Loss On Investments And Other Noncash Income Loss Net GainLossOnInvestmentsAndOtherNoncashIncomeLossNet	194000000	USD
CY2018	cmcsa	Gain Loss On Investments And Other Noncash Income Loss Net GainLossOnInvestmentsAndOtherNoncashIncomeLossNet	-576000000	USD
CY2018Q1	cmcsa	Income Tax Benefit2018 Tax Reform Legislation IncomeTaxBenefit2018TaxReformLegislation	128000000	USD
CY2017	cmcsa	Incometaxtransitiontax2017taxreformlegislation Incometaxtransitiontax2017taxreformlegislation	101000000	USD
CY2016	cmcsa	Increasedecreaseinfilmandtelevisioncostnet Increasedecreaseinfilmandtelevisioncostnet	501000000	USD
CY2017	cmcsa	Increasedecreaseinfilmandtelevisioncostnet Increasedecreaseinfilmandtelevisioncostnet	197000000	USD
CY2018	cmcsa	Increasedecreaseinfilmandtelevisioncostnet Increasedecreaseinfilmandtelevisioncostnet	395000000	USD
CY2017Q4	cmcsa	Investments In And Amounts Due From Subsidiaries Eliminated Upon Consolidation InvestmentsInAndAmountsDueFromSubsidiariesEliminatedUponConsolidation	0	USD
CY2018Q4	cmcsa	Investments In And Amounts Due From Subsidiaries Eliminated Upon Consolidation InvestmentsInAndAmountsDueFromSubsidiariesEliminatedUponConsolidation	0	USD
CY2018Q4	cmcsa	Letters Of Credit And Bank Guarantees Outstanding Amount LettersOfCreditAndBankGuaranteesOutstandingAmount	463000000	USD
CY2016	cmcsa	Net Income Loss Attributable To Noncontrolling Interests And Redeemable Subsidiary Preferred Stock NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock	350000000	USD
CY2017	cmcsa	Net Income Loss Attributable To Noncontrolling Interests And Redeemable Subsidiary Preferred Stock NetIncomeLossAttributableToNoncontrollingInterestsAndRedeemableSubsidiaryPreferredStock	187000000	USD
CY2016	cmcsa	Noncash Interest Expense Income Net NoncashInterestExpenseIncomeNet	230000000	USD
CY2017	cmcsa	Noncash Interest Expense Income Net NoncashInterestExpenseIncomeNet	272000000	USD
CY2018	cmcsa	Noncash Interest Expense Income Net NoncashInterestExpenseIncomeNet	364000000	USD
CY2018	cmcsa	Number Of Businesses NumberOfBusinesses	3	business
CY2018	cmcsa	Number Of Votes Entitled Of Each Class B Common Stock NumberOfVotesEntitledOfEachClassBCommonStock	15	vote
CY2016	cmcsa	Other Income Loss Net OtherIncomeLossNet	529000000	USD
CY2017	cmcsa	Other Income Loss Net OtherIncomeLossNet	331000000	USD
CY2018	cmcsa	Other Income Loss Net OtherIncomeLossNet	326000000	USD
CY2016	cmcsa	Other Operating And Administrative OtherOperatingAndAdministrative	23840000000	USD
CY2017	cmcsa	Other Operating And Administrative OtherOperatingAndAdministrative	25449000000	USD
CY2018	cmcsa	Other Operating And Administrative OtherOperatingAndAdministrative	28094000000	USD
CY2017Q4	cmcsa	Other Stockholders Equity OtherStockholdersEquity	68561000000	USD
CY2018Q4	cmcsa	Other Stockholders Equity OtherStockholdersEquity	71559000000	USD
CY2016	cmcsa	Payments For Acquisitions And Construction Of Real Estate Properties PaymentsForAcquisitionsAndConstructionOfRealEstateProperties	428000000	USD
CY2017	cmcsa	Payments For Acquisitions And Construction Of Real Estate Properties PaymentsForAcquisitionsAndConstructionOfRealEstateProperties	418000000	USD
CY2018	cmcsa	Payments For Acquisitions And Construction Of Real Estate Properties PaymentsForAcquisitionsAndConstructionOfRealEstateProperties	143000000	USD
CY2016	cmcsa	Payments For Construction Of Theme Park PaymentsForConstructionOfThemePark	22000000	USD
CY2017	cmcsa	Payments For Construction Of Theme Park PaymentsForConstructionOfThemePark	71000000	USD
CY2018	cmcsa	Payments For Construction Of Theme Park PaymentsForConstructionOfThemePark	460000000	USD
CY2018Q4	cmcsa	Percentage Of Acquired Film And Television Libraries To Be Amortized In Next Three Years PercentageOfAcquiredFilmAndTelevisionLibrariesToBeAmortizedInNextThreeYears	0.48
CY2016	cmcsa	Proceeds From Sales Of Businesses And Investments ProceedsFromSalesOfBusinessesAndInvestments	218000000	USD
CY2017	cmcsa	Proceeds From Sales Of Businesses And Investments ProceedsFromSalesOfBusinessesAndInvestments	150000000	USD
CY2018	cmcsa	Proceeds From Sales Of Businesses And Investments ProceedsFromSalesOfBusinessesAndInvestments	141000000	USD
CY2016	cmcsa	Programming And Production Costs ProgrammingAndProductionCosts	24348000000	USD
CY2017	cmcsa	Programming And Production Costs ProgrammingAndProductionCosts	25355000000	USD
CY2018	cmcsa	Programming And Production Costs ProgrammingAndProductionCosts	29692000000	USD
CY2017Q4	cmcsa	Programming Rights Current ProgrammingRightsCurrent	1613000000	USD
CY2018Q4	cmcsa	Programming Rights Current ProgrammingRightsCurrent	3746000000	USD
CY2017Q4	cmcsa	Programming Rights Less Amortization ProgrammingRightsLessAmortization	2689000000	USD
CY2018Q4	cmcsa	Programming Rights Less Amortization ProgrammingRightsLessAmortization	5534000000	USD
CY2017Q4	cmcsa	Theatrical Film Costs In Production And In Development TheatricalFilmCostsInProductionAndInDevelopment	1149000000	USD
CY2018Q4	cmcsa	Theatrical Film Costs In Production And In Development TheatricalFilmCostsInProductionAndInDevelopment	1063000000	USD
CY2017Q4	cmcsa	Total Film And Television Costs And Programming Rights After Amortization TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization	8700000000	USD
CY2018Q4	cmcsa	Total Film And Television Costs And Programming Rights After Amortization TotalFilmAndTelevisionCostsAndProgrammingRightsAfterAmortization	11583000000	USD
CY2016	cmcsa	Unrecognized Tax Benefits Increases Resulting From Acquired Subsidiaries UnrecognizedTaxBenefitsIncreasesResultingFromAcquiredSubsidiaries	13000000	USD
CY2017	cmcsa	Unrecognized Tax Benefits Increases Resulting From Acquired Subsidiaries UnrecognizedTaxBenefitsIncreasesResultingFromAcquiredSubsidiaries	0	USD
CY2018	cmcsa	Unrecognized Tax Benefits Increases Resulting From Acquired Subsidiaries UnrecognizedTaxBenefitsIncreasesResultingFromAcquiredSubsidiaries	130000000	USD
CY2016	cmcsa	Unrecognized Tax Benefits Positions Paid UnrecognizedTaxBenefitsPositionsPaid	340000000	USD
CY2017	cmcsa	Unrecognized Tax Benefits Positions Paid UnrecognizedTaxBenefitsPositionsPaid	688000000	USD
CY2018	cmcsa	Unrecognized Tax Benefits Positions Paid UnrecognizedTaxBenefitsPositionsPaid	531000000	USD
CY2018	dei	Amendment Flag AmendmentFlag	false
CY2018	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2018	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2018	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2018
CY2018	dei	Document Period End Date DocumentPeriodEndDate	2018-12-31
CY2018	dei	Document Type DocumentType	10-K
CY2018	dei	Entity Central Index Key EntityCentralIndexKey	0001166691
CY2018	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2018	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2018	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2018Q2	dei	Entity Public Float EntityPublicFloat	149068000000	USD
CY2018	dei	Entity Registrant Name EntityRegistrantName	COMCAST CORP
CY2018	dei	Entity Shell Company EntityShellCompany	false
CY2018	dei	Entity Small Business EntitySmallBusiness	false
CY2018	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2018	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2018	dei	Trading Symbol TradingSymbol	cmcsa
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	6908000000	USD
CY2018Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	8494000000	USD
CY2017Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	9122000000	USD
CY2018Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	11456000000	USD
CY2017Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	8834000000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	11104000000	USD
CY2017Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	6620000000	USD
CY2018Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	10721000000	USD
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	49916000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	55000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-260000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-43000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	3000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	9000000	USD
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	51306000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-325000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	153000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-751000000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	379000000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-368000000	USD
CY2017Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	37497000000	USD
CY2018Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	37461000000	USD
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CY2017Q4	us-gaap	Indefinite Lived Franchise Rights IndefiniteLivedFranchiseRights	59364000000	USD
CY2018Q4	us-gaap	Indefinite Lived Franchise Rights IndefiniteLivedFranchiseRights	59365000000	USD
CY2017Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	89448000000	USD
CY2018Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	1012000000	USD
CY2018Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	9200000000	USD
CY2017	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	45000000	USD
CY2018	us-gaap	Income Tax Reconciliation Minority Interest Income Expense IncomeTaxReconciliationMinorityInterestIncomeExpense	20000000	USD
CY2016	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-67000000	USD
CY2017	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-229000000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-138000000	USD
CY2016	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	373000000	USD
CY2017	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	299000000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	212000000	USD
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3693000000	USD
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	4057000000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2355000000	USD
CY2016	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	378000000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	173000000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable And Accrued Liabilities IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	-394000000	USD
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CY2017	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	639000000	USD
CY2018Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	111917000000	USD
CY2016	us-gaap	Interest Expense InterestExpense	2942000000	USD
CY2017	us-gaap	Interest Expense InterestExpense	3086000000	USD
CY2018	us-gaap	Interest Expense InterestExpense	3542000000	USD
CY2016	us-gaap	Interest Paid Net InterestPaidNet	2565000000	USD
CY2017	us-gaap	Interest Paid Net InterestPaidNet	2820000000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	2897000000	USD
CY2017Q4	us-gaap	Investments Investments	6950000000	USD
CY2018Q4	us-gaap	Investments Investments	7977000000	USD
CY2016	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	744000000	USD
CY2017	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	839000000	USD
CY2018	us-gaap	Lease And Rental Expense LeaseAndRentalExpense	779000000	USD
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	187462000000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	251684000000	USD
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	21993000000	USD
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	27603000000	USD
CY2016Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	1103000000	USD
CY2017Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	809000000	USD
CY2018Q4	us-gaap	Liability For Uncertain Tax Positions Noncurrent LiabilityForUncertainTaxPositionsNoncurrent	1000000000	USD
CY2018Q4	us-gaap	Minority Interest MinorityInterest	889000000	USD
CY2017Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	59422000000	USD
CY2018Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	107345000000	USD
CY2017Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	71700000000	USD
CY2018Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	114100000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	72964000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	4413000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	7818000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	8741000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	11548000000	USD
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	7961000000	USD
CY2017Q4	us-gaap	Long Term Investments LongTermInvestments	6931000000	USD
CY2018Q4	us-gaap	Long Term Investments LongTermInvestments	7883000000	USD
CY2016	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	6291000000	USD
CY2017	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	6519000000	USD
CY2018	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	7036000000	USD
CY2017Q4	us-gaap	Minority Interest MinorityInterest	843000000	USD
CY2017	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	2238000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-434000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-7572000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	27140000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-18265000000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-13533000000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-50854000000	USD
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	19691000000	USD
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CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	24297000000	USD
CY2016	us-gaap	Net Income Loss NetIncomeLoss	8678000000	USD
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	2573000000	USD
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	2521000000	USD
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	2642000000	USD
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	14999000000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	22735000000	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	3118000000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	3216000000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	2886000000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	2511000000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	11731000000	USD
CY2016	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	437000000	USD
CY2017	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	421000000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-225000000	USD
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	16831000000	USD
CY2017Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	4542000000	USD
CY2017Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	4568000000	USD
CY2017Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	4779000000	USD
CY2017Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	4129000000	USD
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	18018000000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	4645000000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	5014000000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	4836000000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	4514000000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	19009000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	759000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	414000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	480000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	616000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	709000000	USD
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	2285000000	USD
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	2468000000	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	3184000000	USD
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	4354000000	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	5802000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	102000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	147000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-916000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	14000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	40000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	-9000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	60000000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	50000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	346000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	168000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-864000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	74000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	81000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	-41000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-213000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-41000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-7000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-125000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-24000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-2000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	1000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	1000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	1000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-92000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	37000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	6000000	USD
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-54000000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	22000000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-4000000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-60000000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-35000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	35000000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	3000000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-42000000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	1000000	USD
CY2016	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1000000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-25000000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1000000	USD
CY2017Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	18133000000	USD
CY2018Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	38358000000	USD
CY2017Q4	us-gaap	Other Investments OtherInvestments	1785000000	USD
CY2018Q4	us-gaap	Other Investments OtherInvestments	1796000000	USD
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	10972000000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	15329000000	USD
CY2016	us-gaap	Other Restructuring Costs OtherRestructuringCosts	315000000	USD
CY2017	us-gaap	Other Restructuring Costs OtherRestructuringCosts	203000000	USD
CY2018	us-gaap	Other Restructuring Costs OtherRestructuringCosts	243000000	USD
CY2016	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-29000000	USD
CY2017	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-785000000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-793000000	USD
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	5352000000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	5435000000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	5320000000	USD
CY2016	us-gaap	Payments Of Dividends PaymentsOfDividends	2601000000	USD
CY2017	us-gaap	Payments Of Dividends PaymentsOfDividends	2883000000	USD
CY2018	us-gaap	Payments Of Dividends PaymentsOfDividends	3352000000	USD
CY2016	us-gaap	Payments To Acquire Additional Interest In Subsidiaries PaymentsToAcquireAdditionalInterestInSubsidiaries	0	USD
CY2017	us-gaap	Payments To Acquire Additional Interest In Subsidiaries PaymentsToAcquireAdditionalInterestInSubsidiaries	2299000000	USD
CY2018	us-gaap	Payments To Acquire Additional Interest In Subsidiaries PaymentsToAcquireAdditionalInterestInSubsidiaries	0	USD
CY2016	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	3929000000	USD
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	532000000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	38219000000	USD
CY2016	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	1552000000	USD
CY2017	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	1605000000	USD
CY2018	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	1935000000	USD
CY2016	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	1697000000	USD
CY2017	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	2292000000	USD
CY2018	us-gaap	Payments To Acquire Investments PaymentsToAcquireInvestments	1257000000	USD
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	9135000000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	9550000000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	9774000000	USD
CY2018Q4	us-gaap	Percentage Of Unamortized Film Costs PercentageOfUnamortizedFilmCosts	0.83
CY2017Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000	shares
CY2018Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000	shares
CY2017Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2018Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0	shares
CY2017Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2018Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2016	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	23000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	0	USD
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	9231000000	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	11466000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	44781000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	44800000000	USD
CY2016	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-220000000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	100000000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-273000000	USD
CY2016	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	1790000000	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-1905000000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	379000000	USD
CY2016	us-gaap	Profit Loss ProfitLoss	9028000000	USD
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	200000000	shares
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1 ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1	P5Y
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.018
CY2017	us-gaap	Profit Loss ProfitLoss	22922000000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	11862000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	88386000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	95743000000	USD
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	38470000000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	44437000000	USD
CY2017Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	1357000000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Carrying Amount RedeemableNoncontrollingInterestEquityCarryingAmount	1316000000	USD
CY2016	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	3052000000	USD
CY2017	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	6364000000	USD
CY2018	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	8800000000	USD
CY2018	us-gaap	Repayments Of Other Debt RepaymentsOfOtherDebt	8798000000	USD
CY2017Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	60000000	USD
CY2018Q4	us-gaap	Restricted Cash Current RestrictedCashCurrent	46000000	USD
CY2017Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	83000000	USD
CY2018Q4	us-gaap	Restricted Cash Noncurrent RestrictedCashNoncurrent	49000000	USD
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	38202000000	USD
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	41983000000	USD
CY2016	us-gaap	Revenues Revenues	80736000000	USD
CY2017Q1	us-gaap	Revenues Revenues	20587000000	USD
CY2017Q2	us-gaap	Revenues Revenues	21286000000	USD
CY2017Q3	us-gaap	Revenues Revenues	21081000000	USD
CY2017Q4	us-gaap	Revenues Revenues	22075000000	USD
CY2017	us-gaap	Revenues Revenues	85029000000	USD
CY2018Q1	us-gaap	Revenues Revenues	22791000000	USD
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CY2018	us-gaap	Revenues Revenues	94507000000	USD
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CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	751000000	USD
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CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.021
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CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.201
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.220
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.015
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.022
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.027
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	41000000	shares
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	5.78
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	7.01
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	7.14
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	27.69
CY2018	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	35.81
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y1M01D
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y1M01D
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y
CY2017Q4	us-gaap	Short Term Investments ShortTermInvestments	19000000	USD
CY2018Q4	us-gaap	Short Term Investments ShortTermInvestments	94000000	USD
CY2016	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	156000000	USD
CY2017	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	190000000	USD
CY2018	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	214000000	USD
CY2016	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	5376000000	USD
CY2017	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	5456000000	USD
CY2018	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	5329000000	USD
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	68616000000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	71613000000	USD
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	53978000000	USD
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	56163000000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	69459000000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	72502000000	USD
CY2016	us-gaap	Stockholders Equity Other StockholdersEquityOther	-144000000	USD
CY2017	us-gaap	Stockholders Equity Other StockholdersEquityOther	-312000000	USD
CY2018	us-gaap	Stockholders Equity Other StockholdersEquityOther	217000000	USD
CY2017Q4	us-gaap	Theatrical Film Costs TheatricalFilmCosts	2933000000	USD
CY2018Q4	us-gaap	Theatrical Film Costs TheatricalFilmCosts	2807000000	USD
CY2017Q4	us-gaap	Theatrical Film Costs Completed And Not Released TheatricalFilmCostsCompletedAndNotReleased	50000000	USD
CY2018Q4	us-gaap	Theatrical Film Costs Completed And Not Released TheatricalFilmCostsCompletedAndNotReleased	144000000	USD
CY2017Q4	us-gaap	Theatrical Film Costs Released TheatricalFilmCostsReleased	1734000000	USD
CY2018Q4	us-gaap	Theatrical Film Costs Released TheatricalFilmCostsReleased	1600000000	USD
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	7517000000	USD
CY2018Q4	us-gaap	Treasury Stock Value TreasuryStockValue	7517000000	USD
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1441000000	USD
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1443000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1497000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	1543000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	66000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	251000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	346000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	47000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	65000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	17000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	74000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	121000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	229000000	USD
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	72000000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	319000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	125000000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	173000000	USD
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CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	70000000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	75000000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	1100000000	USD
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CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	4786000000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	4640000000	shares
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	4819000000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	4708000000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	4584000000	shares
CY2018	us-gaap	Advertising Cost Policy Expensed Advertising Cost AdvertisingCostPolicyExpensedAdvertisingCost	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:8px;padding-top:0px;text-align:justify;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;">Advertising costs are expensed as incurred.</font></div></div>
CY2018	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-bottom:8px;padding-top:0px;text-align:justify;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;">Our consolidated financial statements are prepared in accordance with GAAP, which require us to select accounting policies, including in certain cases industry-specific policies, and make estimates that affect the 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 following items are critical in the preparation of our consolidated financial statements:</font><font style="font-family:Times New Roman;font-size:10pt;"> </font></div><table cellpadding="0" cellspacing="0" style="padding-top:0px;padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:Times New Roman;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;">valuation and impairment testing of cable franchise rights (see Note 12)</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:0px;padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:Times New Roman;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;">film and television costs (see Note 4)</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:0px;padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:Times New Roman;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;">fair value of acquisition-related assets and liabilities (see Note 8)</font></div></td></tr></table><div style="line-height:120%;padding-bottom:8px;padding-top:0px;text-align:justify;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;">In addition, the following accounting policies are specific to the industries in which we operate:</font></div><table cellpadding="0" cellspacing="0" style="padding-top:0px;padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:Times New Roman;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;">capitalization and amortization of film and television costs (see Note 4)</font></div></td></tr></table><table cellpadding="0" cellspacing="0" style="padding-top:0px;padding-bottom:8px;font-family:Times New Roman; font-size:10pt;"><tr><td style="width:48px;" rowspan="1" colspan="1"></td><td rowspan="1" colspan="1"></td></tr><tr><td style="vertical-align:top" rowspan="1" colspan="1"><div style="line-height:120%;font-size:10pt;padding-left:24px;"><font style="font-family:Times New Roman;font-size:10pt;">•</font></div></td><td style="vertical-align:top;" rowspan="1" colspan="1"><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;">costs for connecting customers to our cable systems (see Note 11)</font></div></td></tr></table><div style="line-height:120%;padding-bottom:8px;padding-top:0px;text-align:justify;font-size:10pt;"><font style="font-family:Times New Roman;font-size:10pt;">Information on other accounting policies and methods that we use in the preparation of our consolidated financial statements are included, where applicable, in their respective footnotes that follow. Below is a discussion of accounting policies and methods used in our consolidated financial statements that are not presented within other footnotes.</font><font style="font-family:Times New Roman;font-size:10pt;"> </font></div></div>

Files In Submission

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$CMCSA
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2018 Form 10-K Financial Statement

#000116669119000005 Filed on January 31, 2019

Income Statement

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Facts In Submission

Files In Submission

$CMCSA COMCAST CORP Stock $cmcsa

2018 Form 10-K Financial Statement

#000116669119000005 Filed on January 31, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CMCSA
COMCAST CORP Stock $cmcsa