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Condensed Consolidating Financial Information (Condensed Consolidating Statement of Income) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenue:    
Revenue $ 26,859 $ 22,791
Costs and Expenses:    
Programming and production 8,569 7,429
Other operating and administrative 7,900 6,514
Advertising, marketing and promotion 1,888 1,604
Depreciation 2,240 2,011
Amortization 1,080 588
Total costs and expenses 21,677 18,146
Operating income 5,182 4,645
Interest expense (1,150) (777)
Investment and other income (loss), net 676 126
Income before income taxes 4,708 3,994
Income tax expense (1,076) (818)
Net income 3,632 3,176
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock 79 58
Net income attributable to Comcast Corporation 3,553 3,118
Comprehensive income (loss) attributable to Comcast Corporation 4,343 3,271
Elimination and Consolidation Adjustments [Member]    
Revenue:    
Revenue (604) (578)
Costs and Expenses:    
Programming and production 0 0
Other operating and administrative (604) (578)
Advertising, marketing and promotion 0 0
Depreciation 0 0
Amortization 0 0
Total costs and expenses (604) (578)
Operating income 0 0
Interest expense 0 0
Investment and other income (loss), net (15,415) (13,069)
Income before income taxes (15,415) (13,069)
Income tax expense 0 0
Net income (15,415) (13,069)
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock 0 0
Net income attributable to Comcast Corporation (15,415) (13,069)
Comprehensive income (loss) attributable to Comcast Corporation (16,309) (13,645)
Comcast Parent [Member] | Reportable Legal Entities [Member]    
Revenue:    
Revenue 305 292
Costs and Expenses:    
Programming and production 0 0
Other operating and administrative 188 228
Advertising, marketing and promotion 0 0
Depreciation 14 11
Amortization 1 1
Total costs and expenses 203 240
Operating income 102 52
Interest expense (896) (561)
Investment and other income (loss), net 4,215 3,520
Income before income taxes 3,421 3,011
Income tax expense 132 107
Net income 3,553 3,118
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock 0 0
Net income attributable to Comcast Corporation 3,553 3,118
Comprehensive income (loss) attributable to Comcast Corporation 4,343 3,271
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
Revenue:    
Revenue 26,859 22,791
Costs and Expenses:    
Programming and production 8,569 7,429
Other operating and administrative 7,746 6,260
Advertising, marketing and promotion 1,888 1,604
Depreciation 2,226 2,000
Amortization 1,079 587
Total costs and expenses 21,508 17,880
Operating income 5,351 4,911
Interest expense (82) (60)
Investment and other income (loss), net 2,238 1,588
Income before income taxes 7,507 6,439
Income tax expense (1,206) (929)
Net income 6,301 5,510
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock 79 58
Net income attributable to Comcast Corporation 6,222 5,452
Comprehensive income (loss) attributable to Comcast Corporation 7,160 5,791
Comcast Holdings [Member] | Subsidiary Issuer [Member] | Reportable Legal Entities [Member]    
Revenue:    
Revenue 0 0
Costs and Expenses:    
Programming and production 0 0
Other operating and administrative 0 0
Advertising, marketing and promotion 0 0
Depreciation 0 0
Amortization 0 0
Total costs and expenses 0 0
Operating income 0 0
Interest expense (3) (3)
Investment and other income (loss), net 4,143 3,319
Income before income taxes 4,140 3,316
Income tax expense (6) 0
Net income 4,134 3,316
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock 0 0
Net income attributable to Comcast Corporation 4,134 3,316
Comprehensive income (loss) attributable to Comcast Corporation 4,122 3,369
CCCL Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
Revenue:    
Revenue 299 286
Costs and Expenses:    
Programming and production 0 0
Other operating and administrative 299 286
Advertising, marketing and promotion 0 0
Depreciation 0 0
Amortization 0 0
Total costs and expenses 299 286
Operating income 0 0
Interest expense (49) (47)
Investment and other income (loss), net 3,314 2,826
Income before income taxes 3,265 2,779
Income tax expense 10 9
Net income 3,275 2,788
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock 0 0
Net income attributable to Comcast Corporation 3,275 2,788
Comprehensive income (loss) attributable to Comcast Corporation 3,275 2,789
NBCUniversal Media Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
Revenue:    
Revenue 0 0
Costs and Expenses:    
Programming and production 0 0
Other operating and administrative 271 318
Advertising, marketing and promotion 0 0
Depreciation 0 0
Amortization 0 0
Total costs and expenses 271 318
Operating income (271) (318)
Interest expense (120) (106)
Investment and other income (loss), net 2,181 1,942
Income before income taxes 1,790 1,518
Income tax expense (6) (5)
Net income 1,784 1,513
Less: Net income (loss) attributable to noncontrolling interests and redeemable subsidiary preferred stock 0 0
Net income attributable to Comcast Corporation 1,784 1,513
Comprehensive income (loss) attributable to Comcast Corporation 1,752 1,696
Service [Member]    
Revenue:    
Revenue 26,859 22,791
Service [Member] | Elimination and Consolidation Adjustments [Member]    
Revenue:    
Revenue 0 0
Service [Member] | Comcast Parent [Member] | Reportable Legal Entities [Member]    
Revenue:    
Revenue 0 0
Service [Member] | Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
Revenue:    
Revenue 26,859 22,791
Service [Member] | Comcast Holdings [Member] | Subsidiary Issuer [Member] | Reportable Legal Entities [Member]    
Revenue:    
Revenue 0 0
Service [Member] | CCCL Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
Revenue:    
Revenue 0 0
Service [Member] | NBCUniversal Media Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
Revenue:    
Revenue 0 0
Management Fee [Member]    
Revenue:    
Revenue 0 0
Management Fee [Member] | Elimination and Consolidation Adjustments [Member]    
Revenue:    
Revenue (604) (578)
Management Fee [Member] | Comcast Parent [Member] | Reportable Legal Entities [Member]    
Revenue:    
Revenue 305 292
Management Fee [Member] | Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
Revenue:    
Revenue 0 0
Management Fee [Member] | Comcast Holdings [Member] | Subsidiary Issuer [Member] | Reportable Legal Entities [Member]    
Revenue:    
Revenue 0 0
Management Fee [Member] | CCCL Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
Revenue:    
Revenue 299 286
Management Fee [Member] | NBCUniversal Media Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]    
Revenue:    
Revenue $ 0 $ 0