v2.4.0.6

Financial Data by Business Segment (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Revenue | $ 15,211 | $ 14,333 | $ 30,089 | $ 26,461
Operating income (loss) before depreciation and amortization | 5,004 | 4,801 | 9,692 | 8,867
Depreciation and amortization | 1,925 | 1,863 | 3,855 | 3,705
Operating income (loss) | 3,079 | 2,938 | 5,837 | 5,162
Capital expenditures | 1,287 | 1,271 | 2,461 | 2,377
Cable segment revenue types as percentage of total cable revenue | 100.00% | 100.00% | 100.00% | 100.00%
Cable Communications [Member] |  |  |  |
Revenue | 9,897 | 9,341 | 19,496 | 18,425
Operating income (loss) before depreciation and amortization | 4,101 | 3,886 | 8,056 | 7,635
Depreciation and amortization | 1,593 | 1,591 | 3,195 | 3,212
Operating income (loss) | 2,508 | 2,295 | 4,861 | 4,423
Capital expenditures | 1,124 | 1,181 | 2,180 | 2,234
Cable Networks [Member] |  |  |  |
Revenue | 2,252 | 2,173 | 4,390 | 3,805
Operating income (loss) before depreciation and amortization | 788 | 846 | 1,593 | 1,511
Depreciation and amortization | 183 | 187 | 361 | 340
Operating income (loss) | 605 | 659 | 1,232 | 1,171
Capital expenditures | 22 | 19 | 31 | 31
Broadcast Television [Member] |  |  |  |
Revenue | 1,540 | 1,695 | 3,391 | 2,583
Operating income (loss) before depreciation and amortization | 196 | 190 | 186 | 225
Depreciation and amortization | 21 | 9 | 42 | 30
Operating income (loss) | 175 | 181 | 144 | 195
Capital expenditures | 11 | 12 | 19 | 17
Filmed Entertainment [Member] |  |  |  |
Revenue | 1,231 | 1,254 | 2,423 | 1,876
Operating income (loss) before depreciation and amortization | (83) | 27 | (77) | (116)
Depreciation and amortization | 4 | 5 | 8 | 9
Operating income (loss) | (87) | 22 | (85) | (125)
Capital expenditures | 3 | 1 | 4 | 2
Theme Parks [Member] |  |  |  |
Revenue | 539 | 521 | 951 | 796
Operating income (loss) before depreciation and amortization | 235 | 225 | 392 | 322
Depreciation and amortization | 63 | 57 | 125 | 115
Operating income (loss) | 172 | 168 | 267 | 207
Capital expenditures | 52 | 28 | 99 | 40
Headquarters And Other [Member] |  |  |  |
Revenue | 11 | 14 | 23 | 25
Operating income (loss) before depreciation and amortization | (155) | (129) | (301) | (249)
Depreciation and amortization | 48 | 44 | 96 | 66
Operating income (loss) | (203) | (173) | (397) | (315)
Capital expenditures | 68 | 25 | 114 | 42
NBCUniversal Eliminations [Member] |  |  |  |
Revenue | (69) | (478) | (202) | (763)
Operating income (loss) before depreciation and amortization | 1 | (158) | 2 | (234)
Depreciation and amortization | 1 | (48) | 0 | (100)
Operating income (loss) | 0 | (110) | 2 | (134)
Capital expenditures | 0 | 0 | 0 | 0
NBCUniversal [Member] |  |  |  |
Revenue | 5,504 | 5,179 | 10,976 | 8,322
Operating income (loss) before depreciation and amortization | 982 | 1,001 | 1,795 | 1,459
Depreciation and amortization | 320 | 254 | 632 | 460
Operating income (loss) | 662 | 747 | 1,163 | 999
Capital expenditures | 156 | 85 | 267 | 132
Corporate and Other [Member] |  |  |  |
Revenue | 130 | 128 | 304 | 316
Operating income (loss) before depreciation and amortization | (90) | (87) | (154) | (228)
Depreciation and amortization | 16 | 16 | 30 | 32
Operating income (loss) | (106) | (103) | (184) | (260)
Capital expenditures | 7 | 5 | 14 | 11
Eliminations [Member] |  |  |  |
Revenue | (320) | (315) | (687) | (602)
Operating income (loss) before depreciation and amortization | 11 | 1 | (5) | 1
Depreciation and amortization | (4) | 2 | (2) | 1
Operating income (loss) | 15 | (1) | (3) | 0
Capital expenditures | $ 0 | $ 0 | $ 0 | $ 0
Cable Communications Segment Revenue Percentage-Video [Member] |  |  |  |
Cable segment revenue types as percentage of total cable revenue | 51.30% | 52.90% | 51.50% | 53.40%
Cable Communications Segment Revenue Percentage - High-speed Internet [Member] |  |  |  |
Cable segment revenue types as percentage of total cable revenue | 24.00% | 23.40% | 24.10% | 23.30%
Cable Communications Segment Revenue Percentage- Phone [Member] |  |  |  |
Cable segment revenue types as percentage of total cable revenue | 9.00% | 9.40% | 9.10% | 9.40%
Cable Communications Segment Revenue Percentage- Advertising [Member] |  |  |  |
Cable segment revenue types as percentage of total cable revenue | 5.60% | 5.50% | 5.30% | 5.20%
Cable Communications Segment Revenue Percentage- Business Services [Member] |  |  |  |
Cable segment revenue types as percentage of total cable revenue | 5.90% | 4.60% | 5.80% | 4.50%
Cable Communications Segment Revenue Percentage- Other [Member] |  |  |  |
Cable segment revenue types as percentage of total cable revenue | 4.20% | 4.20% | 4.20% | 4.20%
Cable Communications Segment Revenue Percentage- Franchise fees [Member] |  |  |  |
Cable segment revenue types as percentage of total cable revenue | 2.80% | 2.80% | 2.80% | 2.80%

X
- Definition Cable segment revenue types as percentage of total cable revenue + References No definition available. + Details
Name: | cmcsa_CableSegmentRevenueTypesAsPercentageOfTotalCableRevenue
Namespace Prefix: | cmcsa_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the operating income or loss excluding depreciation and amortization. + References No definition available. + Details
Name: | cmcsa_OperatingIncomeExcludingDepreciationAndAmortization
Namespace Prefix: | cmcsa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
Name: | us-gaap_DepreciationAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
Name: | us-gaap_OperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
Name: | us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 5 -Section 03 -Paragraph 1 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration