v3.5.0.2

Related Party Transactions (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2016
NBCUniversal Media LLC [Member] |
Related Party Transactions Condensed Financial Statements |
Condensed Consolidated Balance Sheet
|  |  |  | June 30, |  | December 31,
(in millions) |  | 2016 |  |  | 2015
Transactions with Comcast and Consolidated Subsidiaries |  |  |  |  |
|  | Receivables, net | $ | 281 |  | $ | 239
|  | Accounts payable and accrued expenses related to trade creditors | $ | 50 |  | $ | 68
|  | Accrued expenses and other current liabilities | $ | 70 |  | $ | 51
|  | Note payable to Comcast | $ | 1,884 |  | $ | 1,750
|  | Other noncurrent liabilities | $ | 387 |  | $ | 383
Condensed Consolidated Statement of Income
|  |  |  |  | Three Months Ended |  | Six Months Ended
|  |  |  | June 30 | June 30
(in millions) |  |  | 2016 |  |  | 2015 |  | 2016 |  |  | 2015
Transactions with Comcast and Consolidated Subsidiaries |  |  |  |  |  |  |  |  |  |
|  | Revenue | $ | 407 |  | $ | 330 | $ | 813 |  | $ | 672
|  | Operating costs and expenses | $ | (44) |  | $ | (43) | $ | (104) |  | $ | (93)
|  | Other income (expense) |  | $ | (17) |  | $ | (9) | $ | (30) |  | $ | (18)

X
- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
Name: | us-gaap_ScheduleOfRelatedPartyTransactionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=cmcsa_NBCUniversalMediaLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |