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Condensed Consolidating Financial Information (Condensed Consolidating Statement of Income) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue:                      
Revenue $ 28,398 $ 26,827 $ 26,858 $ 26,859 $ 27,846 $ 22,135 $ 21,735 $ 22,791 $ 108,942 $ 94,507 $ 85,029
Costs and Expenses:                      
Programming and production                 34,440 29,692 25,355
Other operating and administrative                 32,807 28,094 25,449
Advertising, marketing and promotion                 7,617 7,036 6,519
Depreciation                 8,663 8,281 7,914
Amortization                 4,290 2,736 2,216
Other operating gains                 0 (341) (442)
Total costs and expenses                 87,817 75,498 67,011
Operating income (loss) 5,247 5,340 5,356 5,182 4,514 4,836 5,014 4,645 21,125 19,009 18,018
Interest expense                 (4,567) (3,542) (3,086)
Investment and other income (loss), net                 438 (225) 421
Income (loss) before income taxes                 16,996 15,242 15,353
Income tax (expense) benefit                 (3,673) (3,380) 7,569
Net income                 13,323 11,862 22,922
Less: Net income attributable to noncontrolling interests and redeemable subsidiary preferred stock                 266 131 187
Net income attributable to Comcast Corporation $ 3,162 $ 3,217 $ 3,125 $ 3,553 $ 2,511 $ 2,886 $ 3,216 $ 3,118 13,057 11,731 22,735
Comprehensive income attributable to Comcast Corporation                 14,472 10,908 22,822
Elimination and Consolidation Adjustments [Member]                      
Revenue:                      
Revenue                 (2,498) (2,372) (2,237)
Costs and Expenses:                      
Programming and production                 0 0 0
Other operating and administrative                 (2,498) (2,372) (2,237)
Advertising, marketing and promotion                 0 0 0
Depreciation                 0 0 0
Amortization                 0 0 0
Other operating gains                 0 0 0
Total costs and expenses                 (2,498) (2,372) (2,237)
Operating income (loss)                 0 0 0
Interest expense                 0 0 0
Investment and other income (loss), net                 (57,311) (51,236) (77,161)
Income (loss) before income taxes                 (57,311) (51,236) (77,161)
Income tax (expense) benefit                 0 0 0
Net income                 (57,311) (51,236) (77,161)
Less: Net income attributable to noncontrolling interests and redeemable subsidiary preferred stock                 0 0 0
Net income attributable to Comcast Corporation                 (57,311) (51,236) (77,161)
Comprehensive income attributable to Comcast Corporation                 (58,916) (50,328) (76,998)
Comcast Parent [Member] | Reportable Legal Entities [Member]                      
Revenue:                      
Revenue                 1,262 1,197 1,128
Costs and Expenses:                      
Programming and production                 0 0 0
Other operating and administrative                 801 947 766
Advertising, marketing and promotion                 0 0 0
Depreciation                 61 46 31
Amortization                 5 5 6
Other operating gains                 0 0 0
Total costs and expenses                 867 998 803
Operating income (loss)                 395 199 325
Interest expense                 (3,511) (2,644) (2,172)
Investment and other income (loss), net                 15,581 13,638 24,076
Income (loss) before income taxes                 12,465 11,193 22,229
Income tax (expense) benefit                 592 538 506
Net income                 13,057 11,731 22,735
Less: Net income attributable to noncontrolling interests and redeemable subsidiary preferred stock                 0 0 0
Net income attributable to Comcast Corporation                 13,057 11,731 22,735
Comprehensive income attributable to Comcast Corporation                 14,472 10,908 22,822
Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]                      
Revenue:                      
Revenue                 108,942 94,507 85,029
Costs and Expenses:                      
Programming and production                 34,440 29,692 25,355
Other operating and administrative                 32,295 27,321 24,767
Advertising, marketing and promotion                 7,617 7,036 6,519
Depreciation                 8,602 8,235 7,883
Amortization                 4,285 2,731 2,210
Other operating gains                 0 (341) (442)
Total costs and expenses                 87,239 74,674 66,292
Operating income (loss)                 21,703 19,833 18,737
Interest expense                 (379) (266) (239)
Investment and other income (loss), net                 5,755 5,054 5,545
Income (loss) before income taxes                 27,079 24,621 24,043
Income tax (expense) benefit                 (4,251) (3,962) 6,840
Net income                 22,828 20,659 30,883
Less: Net income attributable to noncontrolling interests and redeemable subsidiary preferred stock                 266 131 187
Net income attributable to Comcast Corporation                 22,562 20,528 30,696
Comprehensive income attributable to Comcast Corporation                 24,210 19,553 30,558
Comcast Holdings [Member] | Subsidiary Issuer [Member] | Reportable Legal Entities [Member]                      
Revenue:                      
Revenue                 0 0 0
Costs and Expenses:                      
Programming and production                 0 0 0
Other operating and administrative                 16 0 0
Advertising, marketing and promotion                 0 0 0
Depreciation                 0 0 0
Amortization                 0 0 0
Other operating gains                 0 0 0
Total costs and expenses                 16 0 0
Operating income (loss)                 (16) 0 0
Interest expense                 (13) (12) (12)
Investment and other income (loss), net                 15,366 13,604 21,767
Income (loss) before income taxes                 15,337 13,592 21,755
Income tax (expense) benefit                 (9) 8 156
Net income                 15,328 13,600 21,911
Less: Net income attributable to noncontrolling interests and redeemable subsidiary preferred stock                 0 0 0
Net income attributable to Comcast Corporation                 15,328 13,600 21,911
Comprehensive income attributable to Comcast Corporation                 15,321 13,623 21,909
CCCL Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]                      
Revenue:                      
Revenue                 1,236 1,175 1,109
Costs and Expenses:                      
Programming and production                 0 0 0
Other operating and administrative                 1,236 1,175 1,109
Advertising, marketing and promotion                 0 0 0
Depreciation                 0 0 0
Amortization                 0 0 0
Other operating gains                 0 0 0
Total costs and expenses                 1,236 1,175 1,109
Operating income (loss)                 0 0 0
Interest expense                 (190) (190) (207)
Investment and other income (loss), net                 13,787 12,021 19,610
Income (loss) before income taxes                 13,597 11,831 19,403
Income tax (expense) benefit                 40 40 71
Net income                 13,637 11,871 19,474
Less: Net income attributable to noncontrolling interests and redeemable subsidiary preferred stock                 0 0 0
Net income attributable to Comcast Corporation                 13,637 11,871 19,474
Comprehensive income attributable to Comcast Corporation                 13,641 11,873 19,477
NBCUniversal Media Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]                      
Revenue:                      
Revenue                 0 0 0
Costs and Expenses:                      
Programming and production                 0 0 0
Other operating and administrative                 957 1,023 1,044
Advertising, marketing and promotion                 0 0 0
Depreciation                 0 0 0
Amortization                 0 0 0
Other operating gains                 0 0 0
Total costs and expenses                 957 1,023 1,044
Operating income (loss)                 (957) (1,023) (1,044)
Interest expense                 (474) (430) (456)
Investment and other income (loss), net                 7,260 6,694 6,584
Income (loss) before income taxes                 5,829 5,241 5,084
Income tax (expense) benefit                 (45) (4) (4)
Net income                 5,784 5,237 5,080
Less: Net income attributable to noncontrolling interests and redeemable subsidiary preferred stock                 0 0 0
Net income attributable to Comcast Corporation                 5,784 5,237 5,080
Comprehensive income attributable to Comcast Corporation                 5,744 5,279 5,054
Service [Member]                      
Revenue:                      
Revenue                 108,942 94,507 85,029
Service [Member] | Elimination and Consolidation Adjustments [Member]                      
Revenue:                      
Revenue                 0 0 0
Service [Member] | Comcast Parent [Member] | Reportable Legal Entities [Member]                      
Revenue:                      
Revenue                 0 0 0
Service [Member] | Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]                      
Revenue:                      
Revenue                 108,942 94,507 85,029
Service [Member] | Comcast Holdings [Member] | Subsidiary Issuer [Member] | Reportable Legal Entities [Member]                      
Revenue:                      
Revenue                 0 0 0
Service [Member] | CCCL Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]                      
Revenue:                      
Revenue                 0 0 0
Service [Member] | NBCUniversal Media Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]                      
Revenue:                      
Revenue                 0 0 0
Management Fee [Member]                      
Revenue:                      
Revenue                 0 0 0
Management Fee [Member] | Elimination and Consolidation Adjustments [Member]                      
Revenue:                      
Revenue                 (2,498) (2,372) (2,237)
Management Fee [Member] | Comcast Parent [Member] | Reportable Legal Entities [Member]                      
Revenue:                      
Revenue                 1,262 1,197 1,128
Management Fee [Member] | Non-Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]                      
Revenue:                      
Revenue                 0 0 0
Management Fee [Member] | Comcast Holdings [Member] | Subsidiary Issuer [Member] | Reportable Legal Entities [Member]                      
Revenue:                      
Revenue                 0 0 0
Management Fee [Member] | CCCL Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]                      
Revenue:                      
Revenue                 1,236 1,175 1,109
Management Fee [Member] | NBCUniversal Media Parent [Member] | Guarantor Subsidiaries [Member] | Reportable Legal Entities [Member]                      
Revenue:                      
Revenue                 $ 0 $ 0 $ 0