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Condensed Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Property and equipment - accumulated depreciation $ 51,932 $ 51,306
Other intangible assets - accumulated amortization $ 15,042 $ 14,194
Preferred stock, shares authorized (in shares) 20,000,000 20,000,000
Preferred stock, shares issued (in shares) 0 0
NBCUniversal Media LLC [Member]    
Property and equipment - accumulated depreciation $ 5,203 $ 4,994
Other intangible assets - accumulated amortization $ 8,861 $ 8,590
Class A Common Stock [Member]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 7,500,000,000 7,500,000,000
Common stock, shares issued (in shares) 5,401,861,861 5,389,309,175
Common stock, shares outstanding (in shares) 4,529,070,833 4,516,518,147
Treasury stock (in shares) 872,791,028 872,791,028
Class B Common Stock [Member]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 75,000,000 75,000,000
Common stock, shares issued (in shares) 9,444,375 9,444,375
Common stock, shares outstanding (in shares) 9,444,375 9,444,375