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Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 5,726 | $ 3,428 |  |
Receivables, net | 8,847 | 8,834 |  |
Programming rights | 1,219 | 1,613 |  |
Other current assets | 2,423 | 2,468 |  |
Total current assets | 18,215 | 16,343 |  |
Film and television costs | 7,411 | 7,087 |  |
Investments | 7,438 | 6,931 |  |
Investments in and amounts due from subsidiaries eliminated upon consolidation | 0 | 0 |  |
Property and equipment, net | 39,355 | 38,470 |  |
Franchise rights | 59,365 | 59,364 |  |
Goodwill | 36,872 | 36,780 |  |
Other intangible assets, net | 18,848 | 18,133 |  |
Other noncurrent assets, net | 3,744 | 4,354 |  |
Total assets | 191,248 | 187,462 |  |
Liabilities and Equity |  |  |  |
Accounts payable and accrued expenses related to trade creditors | 6,940 | 6,908 |  |
Accrued participations and residuals | 1,731 | 1,644 |  |
Deferred revenue | 1,746 | 1,687 |  |
Accrued expenses and other current liabilities | 5,956 | 6,620 |  |
Current portion of long-term debt | 2,634 | 5,134 |  |
Total current liabilities | 19,007 | 21,993 |  |
Long-term debt, less current portion | 61,946 | 59,422 |  |
Deferred income taxes | 25,140 | 24,259 |  |
Other noncurrent liabilities | 12,069 | 10,972 |  |
Redeemable noncontrolling interests | 1,343 | 1,357 |  |
Equity: |  |  |  |
Common stock | 54 | 55 |  |
Other shareholders’ equity | 70,640 | 68,561 |  |
Total Comcast Corporation shareholders’ equity | 70,694 | 68,616 |  |
Noncontrolling interests | 1,049 | 843 |  |
Total equity | 71,743 | 69,459 | $ 55,851 | $ 56,163
Total liabilities and equity | 191,248 | 187,462 |  |
Elimination and Consolidation Adjustments [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Receivables, net | 0 | 0 |  |
Programming rights | 0 | 0 |  |
Other current assets | 0 | 0 |  |
Total current assets | 0 | 0 |  |
Film and television costs | 0 | 0 |  |
Investments | 0 | 0 |  |
Investments in and amounts due from subsidiaries eliminated upon consolidation | (584,902) | (562,645) |  |
Property and equipment, net | 0 | 0 |  |
Franchise rights | 0 | 0 |  |
Goodwill | 0 | 0 |  |
Other intangible assets, net | 0 | 0 |  |
Other noncurrent assets, net | (237) | (314) |  |
Total assets | (585,139) | (562,959) |  |
Liabilities and Equity |  |  |  |
Accounts payable and accrued expenses related to trade creditors | 0 | 0 |  |
Accrued participations and residuals | 0 | 0 |  |
Deferred revenue | 0 | 0 |  |
Accrued expenses and other current liabilities | 0 | 0 |  |
Current portion of long-term debt | 0 | 0 |  |
Total current liabilities | 0 | 0 |  |
Long-term debt, less current portion | 0 | 0 |  |
Deferred income taxes | (266) | (343) |  |
Other noncurrent liabilities | 29 | 29 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Equity: |  |  |  |
Common stock | 0 | 0 |  |
Other shareholders’ equity | (584,902) | (562,645) |  |
Total Comcast Corporation shareholders’ equity | (584,902) | (562,645) |  |
Noncontrolling interests | 0 | 0 |  |
Total equity | (584,902) | (562,645) |  |
Total liabilities and equity | (585,139) | (562,959) |  |
Comcast Parent [Member] | Reportable Legal Entities [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Receivables, net | 0 | 0 |  |
Programming rights | 0 | 0 |  |
Other current assets | 73 | 60 |  |
Total current assets | 73 | 60 |  |
Film and television costs | 0 | 0 |  |
Investments | 172 | 146 |  |
Investments in and amounts due from subsidiaries eliminated upon consolidation | 120,710 | 117,164 |  |
Property and equipment, net | 648 | 551 |  |
Franchise rights | 0 | 0 |  |
Goodwill | 0 | 0 |  |
Other intangible assets, net | 12 | 12 |  |
Other noncurrent assets, net | 415 | 435 |  |
Total assets | 122,030 | 118,368 |  |
Liabilities and Equity |  |  |  |
Accounts payable and accrued expenses related to trade creditors | 22 | 16 |  |
Accrued participations and residuals | 0 | 0 |  |
Deferred revenue | 0 | 0 |  |
Accrued expenses and other current liabilities | 2,198 | 1,888 |  |
Current portion of long-term debt | 0 | 2,810 |  |
Total current liabilities | 2,220 | 4,714 |  |
Long-term debt, less current portion | 46,387 | 42,428 |  |
Deferred income taxes | 0 | 0 |  |
Other noncurrent liabilities | 2,729 | 2,610 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Equity: |  |  |  |
Common stock | 54 | 55 |  |
Other shareholders’ equity | 70,640 | 68,561 |  |
Total Comcast Corporation shareholders’ equity | 70,694 | 68,616 |  |
Noncontrolling interests | 0 | 0 |  |
Total equity | 70,694 | 68,616 |  |
Total liabilities and equity | 122,030 | 118,368 |  |
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 5,421 | 2,932 |  |
Receivables, net | 8,847 | 8,834 |  |
Programming rights | 1,219 | 1,613 |  |
Other current assets | 2,314 | 2,376 |  |
Total current assets | 17,801 | 15,755 |  |
Film and television costs | 7,411 | 7,087 |  |
Investments | 6,421 | 5,963 |  |
Investments in and amounts due from subsidiaries eliminated upon consolidation | 116,955 | 113,332 |  |
Property and equipment, net | 38,707 | 37,919 |  |
Franchise rights | 59,365 | 59,364 |  |
Goodwill | 36,872 | 36,780 |  |
Other intangible assets, net | 18,836 | 18,121 |  |
Other noncurrent assets, net | 3,211 | 3,437 |  |
Total assets | 305,579 | 297,758 |  |
Liabilities and Equity |  |  |  |
Accounts payable and accrued expenses related to trade creditors | 6,918 | 6,892 |  |
Accrued participations and residuals | 1,731 | 1,644 |  |
Deferred revenue | 1,746 | 1,687 |  |
Accrued expenses and other current liabilities | 3,080 | 3,981 |  |
Current portion of long-term debt | 2,630 | 2,320 |  |
Total current liabilities | 16,105 | 16,524 |  |
Long-term debt, less current portion | 5,569 | 7,003 |  |
Deferred income taxes | 25,043 | 24,250 |  |
Other noncurrent liabilities | 8,109 | 7,205 |  |
Redeemable noncontrolling interests | 1,343 | 1,357 |  |
Equity: |  |  |  |
Common stock | 0 | 0 |  |
Other shareholders’ equity | 248,361 | 240,576 |  |
Total Comcast Corporation shareholders’ equity | 248,361 | 240,576 |  |
Noncontrolling interests | 1,049 | 843 |  |
Total equity | 249,410 | 241,419 |  |
Total liabilities and equity | 305,579 | 297,758 |  |
Comcast Holdings [Member] | Subsidiary Issuer [Member] | Reportable Legal Entities [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Receivables, net | 0 | 0 |  |
Programming rights | 0 | 0 |  |
Other current assets | 8 | 0 |  |
Total current assets | 8 | 0 |  |
Film and television costs | 0 | 0 |  |
Investments | 11 | 21 |  |
Investments in and amounts due from subsidiaries eliminated upon consolidation | 149,838 | 142,519 |  |
Property and equipment, net | 0 | 0 |  |
Franchise rights | 0 | 0 |  |
Goodwill | 0 | 0 |  |
Other intangible assets, net | 0 | 0 |  |
Other noncurrent assets, net | 262 | 708 |  |
Total assets | 150,119 | 143,248 |  |
Liabilities and Equity |  |  |  |
Accounts payable and accrued expenses related to trade creditors | 0 | 0 |  |
Accrued participations and residuals | 0 | 0 |  |
Deferred revenue | 0 | 0 |  |
Accrued expenses and other current liabilities | 92 | 92 |  |
Current portion of long-term debt | 0 | 0 |  |
Total current liabilities | 92 | 92 |  |
Long-term debt, less current portion | 142 | 140 |  |
Deferred income taxes | 293 | 285 |  |
Other noncurrent liabilities | 0 | 0 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Equity: |  |  |  |
Common stock | 0 | 0 |  |
Other shareholders’ equity | 149,592 | 142,731 |  |
Total Comcast Corporation shareholders’ equity | 149,592 | 142,731 |  |
Noncontrolling interests | 0 | 0 |  |
Total equity | 149,592 | 142,731 |  |
Total liabilities and equity | 150,119 | 143,248 |  |
CCCL Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Receivables, net | 0 | 0 |  |
Programming rights | 0 | 0 |  |
Other current assets | 0 | 7 |  |
Total current assets | 0 | 7 |  |
Film and television costs | 0 | 0 |  |
Investments | 110 | 108 |  |
Investments in and amounts due from subsidiaries eliminated upon consolidation | 145,266 | 139,528 |  |
Property and equipment, net | 0 | 0 |  |
Franchise rights | 0 | 0 |  |
Goodwill | 0 | 0 |  |
Other intangible assets, net | 0 | 0 |  |
Other noncurrent assets, net | 0 | 0 |  |
Total assets | 145,376 | 139,643 |  |
Liabilities and Equity |  |  |  |
Accounts payable and accrued expenses related to trade creditors | 0 | 0 |  |
Accrued participations and residuals | 0 | 0 |  |
Deferred revenue | 0 | 0 |  |
Accrued expenses and other current liabilities | 322 | 333 |  |
Current portion of long-term debt | 0 | 0 |  |
Total current liabilities | 322 | 333 |  |
Long-term debt, less current portion | 2,100 | 2,100 |  |
Deferred income taxes | 0 | 0 |  |
Other noncurrent liabilities | 0 | 0 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Equity: |  |  |  |
Common stock | 0 | 0 |  |
Other shareholders’ equity | 142,954 | 137,210 |  |
Total Comcast Corporation shareholders’ equity | 142,954 | 137,210 |  |
Noncontrolling interests | 0 | 0 |  |
Total equity | 142,954 | 137,210 |  |
Total liabilities and equity | 145,376 | 139,643 |  |
NBCUniversal Media Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 305 | 496 |  |
Receivables, net | 0 | 0 |  |
Programming rights | 0 | 0 |  |
Other current assets | 28 | 25 |  |
Total current assets | 333 | 521 |  |
Film and television costs | 0 | 0 |  |
Investments | 724 | 693 |  |
Investments in and amounts due from subsidiaries eliminated upon consolidation | 52,133 | 50,102 |  |
Property and equipment, net | 0 | 0 |  |
Franchise rights | 0 | 0 |  |
Goodwill | 0 | 0 |  |
Other intangible assets, net | 0 | 0 |  |
Other noncurrent assets, net | 93 | 88 |  |
Total assets | 53,283 | 51,404 |  |
Liabilities and Equity |  |  |  |
Accounts payable and accrued expenses related to trade creditors | 0 | 0 |  |
Accrued participations and residuals | 0 | 0 |  |
Deferred revenue | 0 | 0 |  |
Accrued expenses and other current liabilities | 264 | 326 |  |
Current portion of long-term debt | 4 | 4 |  |
Total current liabilities | 268 | 330 |  |
Long-term debt, less current portion | 7,748 | 7,751 |  |
Deferred income taxes | 70 | 67 |  |
Other noncurrent liabilities | 1,202 | 1,128 |  |
Redeemable noncontrolling interests | 0 | 0 |  |
Equity: |  |  |  |
Common stock | 0 | 0 |  |
Other shareholders’ equity | 43,995 | 42,128 |  |
Total Comcast Corporation shareholders’ equity | 43,995 | 42,128 |  |
Noncontrolling interests | 0 | 0 |  |
Total equity | 43,995 | 42,128 |  |
Total liabilities and equity | $ 53,283 | $ 51,404 |  |

X
- Definition The total amount of participations, residual and royalty expenses due to another party in less than one year. Royalty expenses are due to content creators, including artists, authors and other talent; participations includes amounts to financial participants in films, including actors, directors, and producers, for contractually defined participations in a film's net profit or gross receipts; residuals include amounts due to unions and guilds. + References No definition available. + Details
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