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Recent Accounting Pronouncements and Tax Reform (Effects of Changes in Revenue Recognition - Balance Sheet) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Total current assets | $ 18,215 | $ 16,343 |  |
Film and television costs | 7,411 | 7,087 |  |
Other intangible assets, net | 18,848 | 18,133 |  |
Other noncurrent assets, net | 3,744 | 4,354 |  |
Assets | 191,248 | 187,462 |  |
Total current liabilities | 19,007 | 21,993 |  |
Deferred income taxes | 25,140 | 24,259 |  |
Other noncurrent liabilities | 12,069 | 10,972 |  |
Total equity | 71,743 | 69,459 | $ 55,851 | $ 56,163
Total liabilities and equity | 191,248 | 187,462 |  |
NBCUniversal Media LLC [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Total current assets | 10,584 | 11,957 |  |
Film and television costs | 7,401 | 7,082 |  |
Other noncurrent assets, net | 1,781 | 1,804 |  |
Assets | 71,885 | 71,300 |  |
Total current liabilities | 7,483 | 9,932 |  |
Other noncurrent liabilities | 5,138 | 4,153 |  |
Total equity | 45,085 | 43,041 | $ 41,277 | $ 40,875
Total liabilities and equity | $ 71,885 | 71,300 |  |
Previous Reported [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Total current assets |  | 16,060 |  |
Film and television costs |  | 7,076 |  |
Other intangible assets, net |  | 18,779 |  |
Other noncurrent assets, net |  | 3,489 |  |
Assets |  | 186,949 |  |
Total current liabilities |  | 21,561 |  |
Deferred income taxes |  | 24,256 |  |
Other noncurrent liabilities |  | 10,904 |  |
Total equity |  | 69,449 |  |
Total liabilities and equity |  | 186,949 |  |
Previous Reported [Member] | NBCUniversal Media LLC [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Total current assets |  | 11,673 |  |
Film and television costs |  | 7,071 |  |
Other noncurrent assets, net |  | 1,872 |  |
Assets |  | 71,073 |  |
Total current liabilities |  | 9,602 |  |
Other noncurrent liabilities |  | 4,109 |  |
Total equity |  | 43,188 |  |
Total liabilities and equity |  | 71,073 |  |
Effects of Adoption [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Total current assets |  | 283 |  |
Film and television costs |  | 11 |  |
Other intangible assets, net |  | (646) |  |
Other noncurrent assets, net |  | 865 |  |
Assets |  | 513 |  |
Total current liabilities |  | 432 |  |
Deferred income taxes |  | 3 |  |
Other noncurrent liabilities |  | 68 |  |
Total equity |  | 10 |  |
Total liabilities and equity |  | 513 |  |
Effects of Adoption [Member] | Accounting Standards Update 2014-09 [Member] | NBCUniversal Media LLC [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Total current assets |  | 284 |  |
Film and television costs |  | 11 |  |
Other noncurrent assets, net |  | (68) |  |
Assets |  | 227 |  |
Total current liabilities |  | 330 |  |
Other noncurrent liabilities |  | 44 |  |
Total equity |  | (147) |  |
Total liabilities and equity |  | $ 227 |  |

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- Definition The carrying amount of owned films, television series and other television productions and noncurrent acquired television and cable networks programming rights recorded on the balance sheet. Owned films, television series and other television production costs include capitalizable production costs, including direct costs, production overhead, print costs, development costs and interest. Film and television rights include multi-year programming arrangements, acquired movies, series and other programs. The carrying amount is stated at the lower of cost, less accumulated amortization, or net realizable/fair value at the balance sheet date. + References No definition available. + Details
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