{"cik":1166691,"taxonomy":"us-gaap","tag":"StockholdersEquityNoteStockSplitConversionRatio1","label":"Stockholders' Equity Note, Stock Split, Conversion Ratio","description":"Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.","entityName":"COMCAST CORPORATION","units":{"pure":[{"end":"2017-01-24","val":2,"accn":"0001166691-17-000009","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-04-27"},{"end":"2017-01-24","val":2,"accn":"0001166691-17-000022","fy":2017,"fp":"Q2","form":"10-Q","filed":"2017-07-27"},{"end":"2017-01-24","val":2,"accn":"0001166691-17-000031","fy":2017,"fp":"Q3","form":"10-Q","filed":"2017-10-26"},{"end":"2017-01-24","val":2,"accn":"0001166691-18-000004","fy":2017,"fp":"FY","form":"10-K","filed":"2018-01-31","frame":"CY2016Q4I"}]}}