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Condensed Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Property and equipment - accumulated depreciation $ 50,731 $ 49,916
Other intangible assets - accumulated amortization $ 12,960 $ 11,950
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 $ 4,618 $ 4,166
Other intangible assets - accumulated amortization $ 8,157 $ 7,585
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) 5,445,280,035 5,507,854,670
Common stock, shares outstanding (in shares) 4,572,489,007 4,635,063,642
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