v2.4.0.8

Schedule II Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2013
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] |
Comcast Corporation and Subsidiaries |  |  |  |  |  |  |  |
Schedule II — Valuation and Qualifying Accounts |  |  |  |  |  |  |  |
Year ended December 31, 2013, 2012 and 2011 |  |  |  |  |  |  |  |
Year Ended December 31 (in millions) |  | Balance at Beginning of Year |  | Additions Charged to Costs and Expenses |  | Deductions from Reserves |  | Balance at End of Year
2013 |  |  |  |  |  |  |  |
| Allowance for doubtful accounts | $ | 198 | $ | 317 | $ | 294 | $ | 221
| Allowance for returns and customer incentives |  | 307 |  | 528 |  | 460 |  | 375
| Valuation allowance on deferred tax assets |  | 355 |  | 71 |  | 21 |  | 405
2012 |  |  |  |  |  |  |  |
| Allowance for doubtful accounts | $ | 202 | $ | 293 | $ | 297 | $ | 198
| Allowance for returns and customer incentives |  | 425 |  | 599 |  | 717 |  | 307
| Valuation allowance on deferred tax assets |  | 297 |  | 61 |  | 3 |  | 355
2011 |  |  |  |  |  |  |  |
| Allowance for doubtful accounts | $ | 173 | $ | 306 | $ | 277 | $ | 202
| Allowance for returns and customer incentives |  | - |  | 536 |  | 111 |  | 425
| Valuation allowance on deferred tax assets |  | 207 |  | 103 |  | 13 |  | 297
NBCUniversal Media, LLC [Member] |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] |
NBCUniversal Media, LLC |  |  |  |  |  |  |  |
Schedule II — Valuation and Qualifying Accounts |  |  |  |  |  |  |  |
(in millions) |  | Balance at Beginning of Period |  | Additions Charged to Costs and Expenses |  | Deductions from Reserves |  | Balance at End of Period
Successor |  |  |  |  |  |  |  |
Year ended December 31, 2013 |  |  |  |  |  |  |  |
| Allowance for doubtful accounts | $ | 46 | $ | 33 | $ | 14 | $ | 65
| Allowance for returns and customer incentives |  | 307 |  | 525 |  | 460 |  | 372
| Valuation allowance on deferred tax assets |  | 73 |  | 8 |  | 21 |  | 60
Year ended December 31, 2012 |  |  |  |  |  |  |  |
| Allowance for doubtful accounts | $ | 34 | $ | 19 | $ | 7 | $ | 46
| Allowance for returns and customer incentives |  | 425 |  | 599 |  | 717 |  | 307
| Valuation allowance on deferred tax assets |  | 53 |  | 23 |  | 3 |  | 73
Period January 29, 2011 through December 31, 2011 |  |  |  |  |  |  |  |
| Allowance for doubtful accounts | $ | 7 | $ | 35 | $ | 8 | $ | 34
| Allowance for returns and customer incentives |  | - |  | 536 |  | 111 |  | 425
| Valuation allowance on deferred tax assets |  | 57 |  | 9 |  | 13 |  | 53

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration