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Supplemental Financial Information (Net Cash Provided by Operating Activities)(Details) (USD $)
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3 Months Ended | |
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Mar. 31, 2015
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Mar. 31, 2014
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| Net income | $ 2,141,000,000us-gaap_ProfitLoss | $ 1,938,000,000us-gaap_ProfitLoss |
| Adjustments to reconcile net income to net cash provided by operating activities: | ||
| Depreciation and amortization | 2,066,000,000us-gaap_DepreciationAndAmortization | 1,970,000,000us-gaap_DepreciationAndAmortization |
| Share-based compensation | 135,000,000us-gaap_ShareBasedCompensation | 119,000,000us-gaap_ShareBasedCompensation |
| Noncash interest expense (income), net | 51,000,000cmcsa_NoncashInterestExpenseIncomeNet | 42,000,000cmcsa_NoncashInterestExpenseIncomeNet |
| Equity in net (income) losses of investees, net | (33,000,000)us-gaap_IncomeLossFromEquityMethodInvestments | (32,000,000)us-gaap_IncomeLossFromEquityMethodInvestments |
| Cash received from investees | 22,000,000us-gaap_EquityMethodInvestmentDividendsOrDistributions | 18,000,000us-gaap_EquityMethodInvestmentDividendsOrDistributions |
| Net (gain) loss on investment activity and other | (121,000,000)cmcsa_GainLossOnInvestmentsAndNoncashOtherIncomeExpenseNet | (59,000,000)cmcsa_GainLossOnInvestmentsAndNoncashOtherIncomeExpenseNet |
| Deferred income taxes | (119,000,000)us-gaap_DeferredIncomeTaxExpenseBenefit | (226,000,000)us-gaap_DeferredIncomeTaxExpenseBenefit |
| Changes in operating assets and liabilities, net of effects of acquisitions and divestitures: | ||
| Current and noncurrent receivables, net | 119,000,000cmcsa_ChangeInCurrentAndNoncurrentReceivablesNet | 195,000,000cmcsa_ChangeInCurrentAndNoncurrentReceivablesNet |
| Film and television costs, net | (38,000,000)cmcsa_FilmAndTelevisionCostsNet | 154,000,000cmcsa_FilmAndTelevisionCostsNet |
| Accounts payable and accrued expenses related to trade creditors (cash flow) | 372,000,000us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | 82,000,000us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities |
| Other operating assets and liabilities | 650,000,000us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | 285,000,000us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet |
| Net cash provided by operating activities | 5,245,000,000us-gaap_NetCashProvidedByUsedInOperatingActivities | 4,486,000,000us-gaap_NetCashProvidedByUsedInOperatingActivities |
| NBCUniversal Media, LLC [Member] | ||
| Net income | 918,000,000us-gaap_ProfitLoss / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
741,000,000us-gaap_ProfitLoss / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
| Adjustments to reconcile net income to net cash provided by operating activities: | ||
| Depreciation and amortization | 364,000,000us-gaap_DepreciationAndAmortization / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
365,000,000us-gaap_DepreciationAndAmortization / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
| Equity in net (income) losses of investees, net | (20,000,000)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
(18,000,000)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
| Cash received from investees | 12,000,000us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
12,000,000us-gaap_EquityMethodInvestmentDividendsOrDistributions / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
| Net (gain) loss on investment activity and other | 46,000,000cmcsa_GainLossOnInvestmentsAndNoncashOtherIncomeExpenseNet / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
21,000,000cmcsa_GainLossOnInvestmentsAndNoncashOtherIncomeExpenseNet / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
| Deferred income taxes | 3,000,000us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
16,000,000us-gaap_DeferredIncomeTaxExpenseBenefit / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
| Changes in operating assets and liabilities, net of effects of acquisitions and divestitures: | ||
| Current and noncurrent receivables, net | (106,000,000)cmcsa_ChangeInCurrentAndNoncurrentReceivablesNet / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
55,000,000cmcsa_ChangeInCurrentAndNoncurrentReceivablesNet / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
| Film and television costs, net | (36,000,000)cmcsa_FilmAndTelevisionCostsNet / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
148,000,000cmcsa_FilmAndTelevisionCostsNet / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
| Accounts payable and accrued expenses related to trade creditors (cash flow) | 16,000,000us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
(117,000,000)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
| Other operating assets and liabilities | 5,000,000us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
(467,000,000)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
| Net cash provided by operating activities | $ 1,202,000,000us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
$ 756,000,000us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = cmcsa_NBCUniversalMediaLLCMember |
| X | ||||||||||
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- Definition
The increase (decrease) during the reporting period in the amount of current and noncurrent receivables. No definition available.
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- Definition
Amount of net increase (decrease) in film and television costs. No definition available.
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- Definition
The net realized gain or loss on investments sold during the period and other income (expense), net, which, for cash flow reporting, is a component of proceeds from continuing operations. No definition available.
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- Definition
Represents noncash interest expense/income items as adjustments to reconcile net income (loss) to cash provided by (used in) operating activities. No definition available.
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- Details
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- Definition
Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The increase (decrease) during the reporting period in other assets used in operating activities less other operating liabilities used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets and liabilities, other noncurrent assets and liabilities, or a combination of other current and noncurrent assets and liabilities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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