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Condensed Consolidating Financial Information (Condensed Consolidating Statement of Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue:        
Revenue $ 21,735 $ 21,286 $ 44,526 $ 41,873
Costs and Expenses:        
Programming and production 6,300 6,330 13,729 12,391
Other operating and administrative 6,365 6,168 12,879 12,107
Advertising, marketing and promotion 1,653 1,713 3,257 3,290
Depreciation 2,021 1,970 4,032 3,885
Amortization 582 537 1,170 1,090
Other operating gains (200) 0 (200) 0
Total costs and expenses 16,721 16,718 34,867 32,763
Operating income 5,014 4,568 9,659 9,110
Interest expense (806) (758) (1,583) (1,513)
Investment and other income (loss), net 77 99 203 229
Income before income taxes 4,285 3,909 8,279 7,826
Income tax expense (1,077) (1,367) (1,895) (2,629)
Net income 3,208 2,542 6,384 5,197
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock (8) 21 50 103
Net income attributable to Comcast Corporation 3,216 2,521 6,334 5,094
Comprehensive income (loss) attributable to Comcast Corporation 3,069 2,413 6,340 5,230
Elimination and Consolidation Adjustments [Member]        
Revenue:        
Revenue (591) (558) (1,169) (1,103)
Costs and Expenses:        
Programming and production 0 0 0 0
Other operating and administrative (591) (558) (1,169) (1,103)
Advertising, marketing and promotion 0 0 0 0
Depreciation 0 0 0 0
Amortization 0 0 0 0
Other operating gains 0 0 0 0
Total costs and expenses (591) (558) (1,169) (1,103)
Operating income 0 0 0 0
Interest expense 0 0 0 0
Investment and other income (loss), net (13,012) (10,684) (26,081) (21,316)
Income before income taxes (13,012) (10,684) (26,081) (21,316)
Income tax expense 0 0 0 0
Net income (13,012) (10,684) (26,081) (21,316)
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock 0 0 0 0
Net income attributable to Comcast Corporation (13,012) (10,684) (26,081) (21,316)
Comprehensive income (loss) attributable to Comcast Corporation (12,459) (10,250) (26,104) (21,383)
Comcast Parent [Member] | Reportable Legal Entities [Member]        
Revenue:        
Revenue 298 281 590 556
Costs and Expenses:        
Programming and production 0 0 0 0
Other operating and administrative 190 200 418 370
Advertising, marketing and promotion 0 0 0 0
Depreciation 11 7 22 14
Amortization 2 1 3 3
Other operating gains 0 0 0 0
Total costs and expenses 203 208 443 387
Operating income 95 73 147 169
Interest expense (578) (531) (1,139) (1,048)
Investment and other income (loss), net 3,597 2,819 7,117 5,666
Income before income taxes 3,114 2,361 6,125 4,787
Income tax expense 102 160 209 307
Net income 3,216 2,521 6,334 5,094
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock 0 0 0 0
Net income attributable to Comcast Corporation 3,216 2,521 6,334 5,094
Comprehensive income (loss) attributable to Comcast Corporation 3,069 2,413 6,340 5,230
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Revenue:        
Revenue 21,735 21,286 44,526 41,873
Costs and Expenses:        
Programming and production 6,300 6,330 13,729 12,391
Other operating and administrative 6,249 5,988 12,509 11,726
Advertising, marketing and promotion 1,653 1,713 3,257 3,290
Depreciation 2,010 1,963 4,010 3,871
Amortization 580 536 1,167 1,087
Other operating gains (200) 0 (200) 0
Total costs and expenses 16,592 16,530 34,472 32,365
Operating income 5,143 4,756 10,054 9,508
Interest expense (64) (57) (124) (120)
Investment and other income (loss), net 1,324 1,352 2,912 2,631
Income before income taxes 6,403 6,051 12,842 12,019
Income tax expense (1,185) (1,530) (2,114) (2,948)
Net income 5,218 4,521 10,728 9,071
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock (8) 21 50 103
Net income attributable to Comcast Corporation 5,226 4,500 10,678 8,968
Comprehensive income (loss) attributable to Comcast Corporation 4,903 4,257 10,694 8,969
Comcast Holdings [Member] | Subsidiary Issuer [Member] | Reportable Legal Entities [Member]        
Revenue:        
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
Other operating gains 0 0 0 0
Total costs and expenses 0 0 0 0
Operating income 0 0 0 0
Interest expense (3) (3) (6) (6)
Investment and other income (loss), net 3,580 2,642 6,899 5,328
Income before income taxes 3,577 2,639 6,893 5,322
Income tax expense 1 (7) 1 (16)
Net income 3,578 2,632 6,894 5,306
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock 0 0 0 0
Net income attributable to Comcast Corporation 3,578 2,632 6,894 5,306
Comprehensive income (loss) attributable to Comcast Corporation 3,527 2,596 6,896 5,320
CCCL Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Revenue:        
Revenue 293 277 579 547
Costs and Expenses:        
Programming and production 0 0 0 0
Other operating and administrative 293 277 579 547
Advertising, marketing and promotion 0 0 0 0
Depreciation 0 0 0 0
Amortization 0 0 0 0
Other operating gains 0 0 0 0
Total costs and expenses 293 277 579 547
Operating income 0 0 0 0
Interest expense (48) (51) (95) (111)
Investment and other income (loss), net 2,999 2,306 5,825 4,633
Income before income taxes 2,951 2,255 5,730 4,522
Income tax expense 10 18 19 39
Net income 2,961 2,273 5,749 4,561
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock 0 0 0 0
Net income attributable to Comcast Corporation 2,961 2,273 5,749 4,561
Comprehensive income (loss) attributable to Comcast Corporation 2,960 2,274 5,749 4,563
NBCUniversal Media Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Revenue:        
Revenue 0 0 0 0
Costs and Expenses:        
Programming and production 0 0 0 0
Other operating and administrative 224 261 542 567
Advertising, marketing and promotion 0 0 0 0
Depreciation 0 0 0 0
Amortization 0 0 0 0
Other operating gains 0 0 0 0
Total costs and expenses 224 261 542 567
Operating income (224) (261) (542) (567)
Interest expense (113) (116) (219) (228)
Investment and other income (loss), net 1,589 1,664 3,531 3,287
Income before income taxes 1,252 1,287 2,770 2,492
Income tax expense (5) (8) (10) (11)
Net income 1,247 1,279 2,760 2,481
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock 0 0 0 0
Net income attributable to Comcast Corporation 1,247 1,279 2,760 2,481
Comprehensive income (loss) attributable to Comcast Corporation 1,069 1,123 2,765 2,531
Service [Member]        
Revenue:        
Revenue 21,735 21,286 44,526 41,873
Service [Member] | Elimination and Consolidation Adjustments [Member]        
Revenue:        
Revenue 0 0 0 0
Service [Member] | Comcast Parent [Member] | Reportable Legal Entities [Member]        
Revenue:        
Revenue 0 0 0 0
Service [Member] | Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Revenue:        
Revenue 21,735 21,286 44,526 41,873
Service [Member] | Comcast Holdings [Member] | Subsidiary Issuer [Member] | Reportable Legal Entities [Member]        
Revenue:        
Revenue 0 0 0 0
Service [Member] | CCCL Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Revenue:        
Revenue 0 0 0 0
Service [Member] | NBCUniversal Media Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Revenue:        
Revenue 0 0 0 0
Management Fee [Member]        
Revenue:        
Revenue 0 0 0 0
Management Fee [Member] | Elimination and Consolidation Adjustments [Member]        
Revenue:        
Revenue (591) (558) (1,169) (1,103)
Management Fee [Member] | Comcast Parent [Member] | Reportable Legal Entities [Member]        
Revenue:        
Revenue 298 281 590 556
Management Fee [Member] | Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Revenue:        
Revenue 0 0 0 0
Management Fee [Member] | Comcast Holdings [Member] | Subsidiary Issuer [Member] | Reportable Legal Entities [Member]        
Revenue:        
Revenue 0 0 0 0
Management Fee [Member] | CCCL Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Revenue:        
Revenue 293 277 579 547
Management Fee [Member] | NBCUniversal Media Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]        
Revenue:        
Revenue $ 0 $ 0 $ 0 $ 0