v3.3.0.814
Condensed Consolidating Financial Information (Condensed Consolidating Statement of Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Service revenue $ 18,669 $ 16,791 $ 55,265 $ 51,043
Management fee revenue 0 0 0 0
Revenue 18,669 16,791 55,265 51,043
Costs and Expenses:        
Programming and production 5,582 4,772 16,714 15,554
Other operating and administrative 5,394 5,017 15,753 14,688
Advertising, marketing and promotion 1,509 1,298 4,392 3,755
Depreciation 1,697 1,539 5,005 4,707
Amortization 486 420 1,405 1,222
Costs and expenses, total 14,668 13,046 43,269 39,926
Operating income (loss) 4,001 3,745 11,996 11,117
Other Income (Expense):        
Interest expense (659) (663) (2,028) (1,953)
Investment income (loss), net (26) 21 24 254
Equity in net income (losses) of investees, net 1 33 (202) 87
Other income (expense), net (53) (96) 364 (150)
Nonoperating income (Expense), Total (737) (705) (1,842) (1,762)
Income (loss) before income taxes 3,264 3,040 10,154 9,355
Income tax (expense) benefit (1,223) (407) (3,797) (2,759)
Net income (loss) 2,041 2,633 6,357 6,596
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock (45) (41) (165) (141)
Net income (loss) attributable to Parent 1,996 2,592 6,192 6,455
Comprehensive income attributable to Parent 1,967 2,609 6,143 6,402
Elimination and Consolidation Adjustments [Member]        
Service revenue 0 0 0 0
Management fee revenue (646) (620) (1,931) (1,827)
Revenue (646) (620) (1,931) (1,827)
Costs and Expenses:        
Programming and production 0 0 0 0
Other operating and administrative (646) (620) (1,931) (1,827)
Advertising, marketing and promotion 0 0 0 0
Depreciation 0 0 0 0
Amortization 0 0 0 0
Costs and expenses, total (646) (620) (1,931) (1,827)
Operating income (loss) 0 0 0 0
Other Income (Expense):        
Interest expense 0 0 0 0
Investment income (loss), net 0 0 0 0
Equity in net income (losses) of investees, net (10,213) (11,505) (30,963) (30,682)
Other income (expense), net 0 0 0 0
Nonoperating income (Expense), Total (10,213) (11,505) (30,963) (30,682)
Income (loss) before income taxes (10,213) (11,505) (30,963) (30,682)
Income tax (expense) benefit 0 0 0 0
Net income (loss) (10,213) (11,505) (30,963) (30,682)
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock 0 0 0 0
Net income (loss) attributable to Parent (10,213) (11,505) (30,963) (30,682)
Comprehensive income attributable to Parent (10,183) (11,483) (30,895) (30,626)
Comcast Parent [Member]        
Service revenue 0 0 0 0
Management fee revenue 251 237 747 704
Revenue 251 237 747 704
Costs and Expenses:        
Programming and production 0 0 0 0
Other operating and administrative 146 197 597 471
Advertising, marketing and promotion 0 0 0 0
Depreciation 8 10 23 25
Amortization 1 1 4 4
Costs and expenses, total 155 208 624 500
Operating income (loss) 96 29 123 204
Other Income (Expense):        
Interest expense (428) (412) (1,310) (1,199)
Investment income (loss), net 3 1 4 3
Equity in net income (losses) of investees, net 2,210 2,840 6,963 7,100
Other income (expense), net 0 0 (3) 0
Nonoperating income (Expense), Total 1,785 2,429 5,654 5,904
Income (loss) before income taxes 1,881 2,458 5,777 6,108
Income tax (expense) benefit 115 134 415 347
Net income (loss) 1,996 2,592 6,192 6,455
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock 0 0 0 0
Net income (loss) attributable to Parent 1,996 2,592 6,192 6,455
Comprehensive income attributable to Parent 1,967 2,609 6,143 6,402
Comcast Holdings [Member]        
Service revenue 0 0 0 0
Management fee revenue 0 0 0 0
Revenue 0 0 0 0
Costs and Expenses:        
Programming and production 0 0 0 0
Other operating and administrative 0 0 0 0
Advertising, marketing and promotion 0 0 0 0
Depreciation 0 0 0 0
Amortization 0 0 0 0
Costs and expenses, total 0 0 0 0
Operating income (loss) 0 0 0 0
Other Income (Expense):        
Interest expense (3) (2) (9) (8)
Investment income (loss), net (4) 2 (3) 5
Equity in net income (losses) of investees, net 2,123 2,556 6,511 6,731
Other income (expense), net 0 0 0 0
Nonoperating income (Expense), Total 2,116 2,556 6,499 6,728
Income (loss) before income taxes 2,116 2,556 6,499 6,728
Income tax (expense) benefit 2 0 4 1
Net income (loss) 2,118 2,556 6,503 6,729
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock 0 0 0 0
Net income (loss) attributable to Parent 2,118 2,556 6,503 6,729
Comprehensive income attributable to Parent 2,112 2,551 6,489 6,732
CCCL Parent [Member]        
Service revenue 0 0 0 0
Management fee revenue 244 237 727 691
Revenue 244 237 727 691
Costs and Expenses:        
Programming and production 0 0 0 0
Other operating and administrative 244 237 727 691
Advertising, marketing and promotion 0 0 0 0
Depreciation 0 0 0 0
Amortization 0 0 0 0
Costs and expenses, total 244 237 727 691
Operating income (loss) 0 0 0 0
Other Income (Expense):        
Interest expense (44) (43) (131) (132)
Investment income (loss), net 0 0 0 0
Equity in net income (losses) of investees, net 1,963 2,362 5,937 6,301
Other income (expense), net 0 0 0 0
Nonoperating income (Expense), Total 1,919 2,319 5,806 6,169
Income (loss) before income taxes 1,919 2,319 5,806 6,169
Income tax (expense) benefit 16 15 46 46
Net income (loss) 1,935 2,334 5,852 6,215
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock 0 0 0 0
Net income (loss) attributable to Parent 1,935 2,334 5,852 6,215
Comprehensive income attributable to Parent 1,936 2,335 5,852 6,217
Combined CCHMO Parents [Member]        
Service revenue 0 0 0 0
Management fee revenue 151 146 457 432
Revenue 151 146 457 432
Costs and Expenses:        
Programming and production 0 0 0 0
Other operating and administrative 151 146 457 432
Advertising, marketing and promotion 0 0 0 0
Depreciation 0 0 0 0
Amortization 0 0 0 0
Costs and expenses, total 151 146 457 432
Operating income (loss) 0 0 0 0
Other Income (Expense):        
Interest expense (21) (29) (80) (88)
Investment income (loss), net 0 0 0 0
Equity in net income (losses) of investees, net 1,701 1,801 5,060 4,866
Other income (expense), net 0 0 0 0
Nonoperating income (Expense), Total 1,680 1,772 4,980 4,778
Income (loss) before income taxes 1,680 1,772 4,980 4,778
Income tax (expense) benefit 7 10 28 31
Net income (loss) 1,687 1,782 5,008 4,809
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock 0 0 0 0
Net income (loss) attributable to Parent 1,687 1,782 5,008 4,809
Comprehensive income attributable to Parent 1,687 1,781 5,007 4,809
NBCUniversal Media Parent [Member]        
Service revenue 0 0 0 0
Management fee revenue 0 0 0 0
Revenue 0 0 0 0
Costs and Expenses:        
Programming and production 0 0 0 0
Other operating and administrative 235 203 727 697
Advertising, marketing and promotion 0 0 0 0
Depreciation 0 0 0 0
Amortization 0 0 0 0
Costs and expenses, total 235 203 727 697
Operating income (loss) (235) (203) (727) (697)
Other Income (Expense):        
Interest expense (111) (111) (347) (360)
Investment income (loss), net (3) (14) (17) (9)
Equity in net income (losses) of investees, net 1,289 1,144 3,801 3,386
Other income (expense), net (7) (3) (2) 0
Nonoperating income (Expense), Total 1,168 1,016 3,435 3,017
Income (loss) before income taxes 933 813 2,708 2,320
Income tax (expense) benefit (6) (11) (17) (22)
Net income (loss) 927 802 2,691 2,298
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock 0 0 0 0
Net income (loss) attributable to Parent 927 802 2,691 2,298
Comprehensive income attributable to Parent 902 785 2,639 2,302
Comcast Non-Guarantor Subsidiaries [Member]        
Service revenue 18,669 16,791 55,265 51,043
Management fee revenue 0 0 0 0
Revenue 18,669 16,791 55,265 51,043
Costs and Expenses:        
Programming and production 5,582 4,772 16,714 15,554
Other operating and administrative 5,264 4,854 15,176 14,224
Advertising, marketing and promotion 1,509 1,298 4,392 3,755
Depreciation 1,689 1,529 4,982 4,682
Amortization 485 419 1,401 1,218
Costs and expenses, total 14,529 12,872 42,665 39,433
Operating income (loss) 4,140 3,919 12,600 11,610
Other Income (Expense):        
Interest expense (52) (66) (151) (166)
Investment income (loss), net (22) 32 40 255
Equity in net income (losses) of investees, net 928 835 2,489 2,385
Other income (expense), net (46) (93) 369 (150)
Nonoperating income (Expense), Total 808 708 2,747 2,324
Income (loss) before income taxes 4,948 4,627 15,347 13,934
Income tax (expense) benefit (1,357) (555) (4,273) (3,162)
Net income (loss) 3,591 4,072 11,074 10,772
Net (income) loss attributable to noncontrolling interests and redeemable subsidiary preferred stock (45) (41) (165) (141)
Net income (loss) attributable to Parent 3,546 4,031 10,909 10,631
Comprehensive income attributable to Parent $ 3,546 $ 4,031 $ 10,908 $ 10,566