Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001166691-21-000008-index-headers.html | 2021-02-03 18:08:14 | |
| 0001166691-21-000008-index.html | 2021-02-03 18:08:14 | |
| 0001166691-21-000008.txt | 2021-02-03 18:08:14 | |
 0001166691-21-000008-xbrl.zip | 1518644 | 2021-02-03 18:08:14 |
| cmcsa-20201231.htm | 3371726 | 2021-02-03 18:08:14 |
| cmcsa-20201231.xsd | 95409 | 2021-02-03 18:08:14 |
| cmcsa-20201231_cal.xml | 157744 | 2021-02-03 18:08:14 |
| cmcsa-20201231_def.xml | 400136 | 2021-02-03 18:08:14 |
 cmcsa-20201231_g1.jpg | 11291 | 2021-02-03 18:08:14 |
 cmcsa-20201231_g10.jpg | 49987 | 2021-02-03 18:08:14 |
 cmcsa-20201231_g11.jpg | 17501 | 2021-02-03 18:08:14 |
 cmcsa-20201231_g2.jpg | 623051 | 2021-02-03 18:08:14 |
 cmcsa-20201231_g3.jpg | 67274 | 2021-02-03 18:08:14 |
 cmcsa-20201231_g4.jpg | 47769 | 2021-02-03 18:08:14 |
 cmcsa-20201231_g5.jpg | 29284 | 2021-02-03 18:08:14 |
 cmcsa-20201231_g6.jpg | 14661 | 2021-02-03 18:08:14 |
 cmcsa-20201231_g7.jpg | 63431 | 2021-02-03 18:08:14 |
 cmcsa-20201231_g8.jpg | 62561 | 2021-02-03 18:08:14 |
 cmcsa-20201231_g9.jpg | 37744 | 2021-02-03 18:08:14 |
| cmcsa-20201231_htm.xml | 2539837 | 2021-02-03 18:08:14 |
| cmcsa-20201231_lab.xml | 956597 | 2021-02-03 18:08:14 |
| cmcsa-20201231_pre.xml | 626313 | 2021-02-03 18:08:14 |
| ex1012-123120.htm | 164273 | 2021-02-03 18:08:14 |
| ex1035-123120.htm | 108289 | 2021-02-03 18:08:14 |
| ex1036-123120.htm | 130611 | 2021-02-03 18:08:14 |
| ex1037-1231x20.htm | 110451 | 2021-02-03 18:08:14 |
| ex1038-123120.htm | 99756 | 2021-02-03 18:08:14 |
| ex1041-123120.htm | 675857 | 2021-02-03 18:08:14 |
| ex21-123120.htm | 72475 | 2021-02-03 18:08:14 |
| ex23-12312020.htm | 3048 | 2021-02-03 18:08:14 |
| ex31-12312020.htm | 18629 | 2021-02-03 18:08:14 |
| ex32-12312020.htm | 6186 | 2021-02-03 18:08:14 |
| ex415-123120.htm | 469476 | 2021-02-03 18:08:14 |
| FilingSummary.xml | 61214 | 2021-02-03 18:08:14 |
| Financial_Report.xlsx | 152211 | 2021-02-03 18:08:14 |
| MetaLinks.json | 942376 | 2021-02-03 18:08:14 |
| R1.htm | 86744 | 2021-02-03 18:08:14 |
| R10.htm | 114314 | 2021-02-03 18:08:14 |
| R11.htm | 110190 | 2021-02-03 18:08:14 |
| R12.htm | 45603 | 2021-02-03 18:08:14 |
| R13.htm | 94745 | 2021-02-03 18:08:14 |
| R14.htm | 38918 | 2021-02-03 18:08:14 |
| R15.htm | 17113 | 2021-02-03 18:08:14 |
| R16.htm | 15171 | 2021-02-03 18:08:14 |
| R17.htm | 42382 | 2021-02-03 18:08:14 |
| R18.htm | 23850 | 2021-02-03 18:08:14 |
| R19.htm | 81042 | 2021-02-03 18:08:14 |
| R2.htm | 71985 | 2021-02-03 18:08:14 |
| R20.htm | 17369 | 2021-02-03 18:08:14 |
| R21.htm | 38909 | 2021-02-03 18:08:14 |
| R22.htm | 36897 | 2021-02-03 18:08:14 |
| R23.htm | 22536 | 2021-02-03 18:08:14 |
| R24.htm | 26401 | 2021-02-03 18:08:14 |
| R25.htm | 44561 | 2021-02-03 18:08:14 |
| R26.htm | 120469 | 2021-02-03 18:08:14 |
| R27.htm | 126477 | 2021-02-03 18:08:14 |
| R28.htm | 92298 | 2021-02-03 18:08:14 |
| R29.htm | 39604 | 2021-02-03 18:08:14 |
| R3.htm | 34342 | 2021-02-03 18:08:14 |
| R30.htm | 96288 | 2021-02-03 18:08:14 |
| R31.htm | 33397 | 2021-02-03 18:08:14 |
| R32.htm | 14820 | 2021-02-03 18:08:14 |
| R33.htm | 26822 | 2021-02-03 18:08:14 |
| R34.htm | 19324 | 2021-02-03 18:08:14 |
| R35.htm | 76463 | 2021-02-03 18:08:14 |
| R36.htm | 9541 | 2021-02-03 18:08:14 |
| R37.htm | 37599 | 2021-02-03 18:08:14 |
| R38.htm | 38374 | 2021-02-03 18:08:14 |
| R39.htm | 18902 | 2021-02-03 18:08:14 |
| R4.htm | 12122 | 2021-02-03 18:08:14 |
| R40.htm | 19341 | 2021-02-03 18:08:14 |
| R41.htm | 44034 | 2021-02-03 18:08:14 |
| R42.htm | 12609 | 2021-02-03 18:08:14 |
| R43.htm | 85176 | 2021-02-03 18:08:14 |
| R44.htm | 25505 | 2021-02-03 18:08:14 |
| R45.htm | 102985 | 2021-02-03 18:08:14 |
| R46.htm | 18951 | 2021-02-03 18:08:14 |
| R47.htm | 43511 | 2021-02-03 18:08:14 |
| R48.htm | 17085 | 2021-02-03 18:08:14 |
| R49.htm | 9742 | 2021-02-03 18:08:14 |
| R5.htm | 81598 | 2021-02-03 18:08:14 |
| R50.htm | 15807 | 2021-02-03 18:08:14 |
| R51.htm | 56527 | 2021-02-03 18:08:14 |
| R52.htm | 19485 | 2021-02-03 18:08:14 |
| R53.htm | 5833 | 2021-02-03 18:08:14 |
| R54.htm | 12404 | 2021-02-03 18:08:14 |
| R55.htm | 29953 | 2021-02-03 18:08:14 |
| R56.htm | 22495 | 2021-02-03 18:08:14 |
| R57.htm | 25776 | 2021-02-03 18:08:14 |
| R58.htm | 8998 | 2021-02-03 18:08:14 |
| R59.htm | 11674 | 2021-02-03 18:08:14 |
| R6.htm | 114299 | 2021-02-03 18:08:14 |
| R60.htm | 18131 | 2021-02-03 18:08:14 |
| R61.htm | 43984 | 2021-02-03 18:08:14 |
| R62.htm | 44206 | 2021-02-03 18:08:14 |
| R63.htm | 17247 | 2021-02-03 18:08:14 |
| R64.htm | 8100 | 2021-02-03 18:08:14 |
| R65.htm | 7512 | 2021-02-03 18:08:14 |
| R66.htm | 11236 | 2021-02-03 18:08:14 |
| R67.htm | 23016 | 2021-02-03 18:08:14 |
| R68.htm | 28521 | 2021-02-03 18:08:14 |
| R69.htm | 14171 | 2021-02-03 18:08:14 |
| R7.htm | 19879 | 2021-02-03 18:08:14 |
| R70.htm | 19632 | 2021-02-03 18:08:14 |
| R71.htm | 79871 | 2021-02-03 18:08:14 |
| R72.htm | 17579 | 2021-02-03 18:08:14 |
| R73.htm | 26321 | 2021-02-03 18:08:14 |
| R74.htm | 39760 | 2021-02-03 18:08:14 |
| R75.htm | 27841 | 2021-02-03 18:08:14 |
| R76.htm | 9950 | 2021-02-03 18:08:14 |
| R77.htm | 13332 | 2021-02-03 18:08:14 |
| R78.htm | 7443 | 2021-02-03 18:08:14 |
| R79.htm | 6929 | 2021-02-03 18:08:14 |
| R8.htm | 89377 | 2021-02-03 18:08:14 |
| R80.htm | 9007 | 2021-02-03 18:08:14 |
| R81.htm | 19687 | 2021-02-03 18:08:14 |
| R82.htm | 10494 | 2021-02-03 18:08:14 |
| R83.htm | 14192 | 2021-02-03 18:08:14 |
| R84.htm | 12333 | 2021-02-03 18:08:14 |
| R85.htm | 19174 | 2021-02-03 18:08:14 |
| R86.htm | 19429 | 2021-02-03 18:08:14 |
| R87.htm | 20871 | 2021-02-03 18:08:14 |
| R88.htm | 7423 | 2021-02-03 18:08:14 |
| R89.htm | 13904 | 2021-02-03 18:08:14 |
| R9.htm | 14943 | 2021-02-03 18:08:14 |
| R90.htm | 14841 | 2021-02-03 18:08:14 |
| R91.htm | 35405 | 2021-02-03 18:08:14 |
| R92.htm | 14866 | 2021-02-03 18:08:14 |
| R93.htm | 20701 | 2021-02-03 18:08:14 |
| R94.htm | 36617 | 2021-02-03 18:08:14 |
| report.css | 2768 | 2021-02-03 18:08:14 |
| Show.js | 1086 | 2021-02-03 18:08:14 |