v3.7.0.1
Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheet) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Assets        
Cash and cash equivalents $ 4,022 $ 3,301 $ 5,628 $ 2,295
Receivables, net 7,525 7,955    
Programming rights 1,479 1,250    
Other current assets 2,219 3,855    
Total current assets 15,245 16,361    
Film and television costs 6,968 7,252    
Investments 5,938 5,247    
Investments in and amounts due from subsidiaries eliminated upon consolidation 0 0    
Property and equipment, net 36,626 36,253    
Franchise rights 59,364 59,364    
Goodwill 36,592 35,980    
Other intangible assets, net 19,014 17,274    
Other noncurrent assets, net 2,732 2,769    
Total assets 182,479 180,500    
Liabilities and Equity        
Accounts payable and accrued expenses related to trade creditors 6,658 6,915    
Accrued participations and residuals 1,811 1,726    
Accrued expenses and other current liabilities 7,096 7,414    
Current portion of long-term debt 3,509 5,480    
Total current liabilities 19,074 21,535    
Long-term debt, less current portion 58,276 55,566    
Deferred income taxes 35,348 34,854    
Other noncurrent liabilities 10,677 10,925    
Redeemable noncontrolling interests 1,456 1,446    
Equity:        
Common stock 56 56    
Other shareholders' equity 55,003 53,887    
Total Comcast Corporation shareholders’ equity 55,059 53,943    
Noncontrolling interests 2,589 2,231    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 57,648 56,174 54,512 53,978
Total liabilities and equity 182,479 180,500    
Elimination and Consolidation Adjustments [Member]        
Assets        
Cash and cash equivalents 0 0 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 (498,726) (481,214)    
Property and equipment, net 0 0    
Franchise rights 0 0    
Goodwill 0 0    
Other intangible assets, net 0 0    
Other noncurrent assets, net (1,005) (1,017)    
Total assets (499,731) (482,231)    
Liabilities and Equity        
Accounts payable and accrued expenses related to trade creditors 0 0    
Accrued participations and residuals 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 (1,005) (1,017)    
Other noncurrent liabilities 0 0    
Redeemable noncontrolling interests 0 0    
Equity:        
Common stock 0 0    
Other shareholders' equity (498,726) (481,214)    
Total Comcast Corporation shareholders’ equity (498,726) (481,214)    
Noncontrolling interests 0 0    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (498,726) (481,214)    
Total liabilities and equity (499,731) (482,231)    
Comcast Parent [Member]        
Assets        
Cash and cash equivalents 0 0 0 0
Receivables, net 0 0    
Programming rights 0 0    
Other current assets 96 151    
Total current assets 96 151    
Film and television costs 0 0    
Investments 84 75    
Investments in and amounts due from subsidiaries eliminated upon consolidation 100,103 98,350    
Property and equipment, net 364 298    
Franchise rights 0 0    
Goodwill 0 0    
Other intangible assets, net 12 13    
Other noncurrent assets, net 1,115 1,138    
Total assets 101,774 100,025    
Liabilities and Equity        
Accounts payable and accrued expenses related to trade creditors 17 23    
Accrued participations and residuals 0 0    
Accrued expenses and other current liabilities 1,582 1,726    
Current portion of long-term debt 1,905 3,739    
Total current liabilities 3,504 5,488    
Long-term debt, less current portion 40,711 38,123    
Deferred income taxes 0 0    
Other noncurrent liabilities 2,500 2,471    
Redeemable noncontrolling interests 0 0    
Equity:        
Common stock 56 56    
Other shareholders' equity 55,003 53,887    
Total Comcast Corporation shareholders’ equity 55,059 53,943    
Noncontrolling interests 0 0    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 55,059 53,943    
Total liabilities and equity 101,774 100,025    
Comcast Holdings [Member]        
Assets        
Cash and cash equivalents 0 0 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 123,806 120,071    
Property and equipment, net 0 0    
Franchise rights 0 0    
Goodwill 0 0    
Other intangible assets, net 0 0    
Other noncurrent assets, net 666 638    
Total assets 124,472 120,709    
Liabilities and Equity        
Accounts payable and accrued expenses related to trade creditors 0 0    
Accrued participations and residuals 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 143 141    
Deferred income taxes 524 542    
Other noncurrent liabilities 0 0    
Redeemable noncontrolling interests 0 0    
Equity:        
Common stock 0 0    
Other shareholders' equity 123,805 120,026    
Total Comcast Corporation shareholders’ equity 123,805 120,026    
Noncontrolling interests 0 0    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 123,805 120,026    
Total liabilities and equity 124,472 120,709    
CCCL Parent [Member]        
Assets        
Cash and cash equivalents 0 0 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 10 0    
Investments in and amounts due from subsidiaries eliminated upon consolidation 120,362 117,696    
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 120,372 117,696    
Liabilities and Equity        
Accounts payable and accrued expenses related to trade creditors 0 0    
Accrued participations and residuals 0 0    
Accrued expenses and other current liabilities 211 341    
Current portion of long-term debt 550 550    
Total current liabilities 761 891    
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 117,511 114,705    
Total Comcast Corporation shareholders’ equity 117,511 114,705    
Noncontrolling interests 0 0    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 117,511 114,705    
Total liabilities and equity 120,372 117,696    
NBCUniversal Media Parent [Member]        
Assets        
Cash and cash equivalents 270 482 178 414
Receivables, net 0 0    
Programming rights 0 0    
Other current assets 60 36    
Total current assets 330 518    
Film and television costs 0 0    
Investments 657 651    
Investments in and amounts due from subsidiaries eliminated upon consolidation 49,537 47,393    
Property and equipment, net 0 0    
Franchise rights 0 0    
Goodwill 0 0    
Other intangible assets, net 0 0    
Other noncurrent assets, net 80 89    
Total assets 50,604 48,651    
Liabilities and Equity        
Accounts payable and accrued expenses related to trade creditors 0 0    
Accrued participations and residuals 0 0    
Accrued expenses and other current liabilities 361 302    
Current portion of long-term debt 4 4    
Total current liabilities 365 306    
Long-term debt, less current portion 8,204 8,208    
Deferred income taxes 69 70    
Other noncurrent liabilities 1,103 1,166    
Redeemable noncontrolling interests 0 0    
Equity:        
Common stock 0 0    
Other shareholders' equity 40,863 38,901    
Total Comcast Corporation shareholders’ equity 40,863 38,901    
Noncontrolling interests 0 0    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 40,863 38,901    
Total liabilities and equity 50,604 48,651    
Comcast Non-Guarantor Subsidiaries [Member]        
Assets        
Cash and cash equivalents 3,752 2,819 $ 5,450 $ 1,881
Receivables, net 7,525 7,955    
Programming rights 1,479 1,250    
Other current assets 2,063 3,668    
Total current assets 14,819 15,692    
Film and television costs 6,968 7,252    
Investments 5,187 4,521    
Investments in and amounts due from subsidiaries eliminated upon consolidation 104,918 97,704    
Property and equipment, net 36,262 35,955    
Franchise rights 59,364 59,364    
Goodwill 36,592 35,980    
Other intangible assets, net 19,002 17,261    
Other noncurrent assets, net 1,876 1,921    
Total assets 284,988 275,650    
Liabilities and Equity        
Accounts payable and accrued expenses related to trade creditors 6,641 6,892    
Accrued participations and residuals 1,811 1,726    
Accrued expenses and other current liabilities 4,942 5,045    
Current portion of long-term debt 1,050 1,187    
Total current liabilities 14,444 14,850    
Long-term debt, less current portion 7,118 6,994    
Deferred income taxes 35,760 35,259    
Other noncurrent liabilities 7,074 7,288    
Redeemable noncontrolling interests 1,456 1,446    
Equity:        
Common stock 0 0    
Other shareholders' equity 216,547 207,582    
Total Comcast Corporation shareholders’ equity 216,547 207,582    
Noncontrolling interests 2,589 2,231    
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 219,136 209,813    
Total liabilities and equity $ 284,988 $ 275,650