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Income Taxes (Components of Net Deferred Tax Liability) (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
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|---|---|---|
| Net operating loss carryforwards | $ 495 | $ 491 |
| Differences between book and tax basis of long-term debt | 117 | 109 |
| Nondeductible accruals and other | 3,588 | 1,771 |
| Less: Valuation allowance | 405 | 355 |
| Total deferred tax assets | 3,795 | 2,016 |
| Total deferred tax liabilities | 35,494 | 32,033 |
| Net deferred tax liability | 31,699 | 30,017 |
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Property And Equipment And Intangible Assets [Member]
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| Deferred tax liabilities, other | 34,044 | 29,185 |
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Investments [Member]
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| Deferred tax liabilities, other | 473 | 848 |
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Indexed Debt Securities [Member]
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| Deferred tax liabilities, other | 610 | 587 |
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Foreign Subsidiaries And Undistributed Foreign Earnings [Member]
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| Deferred tax liabilities, other | 367 | |
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Differences Between Book And Tax Outside Basis Of NBCuniversal [Member] | NBCUniversal [Member]
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| Deferred tax liabilities, other | $ 1,413 |
| X | ||||||||||
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other reserves and accruals not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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