v3.19.3.a.u2
Acquisitions, Dispositions And Other Adjustments (Dispositions Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2019
Apr. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]          
Cash proceeds from sale of businesses and interest in affiliates     $ 4,684 $ 2,148 $ 59
Property, Plant and Equipment - Net     130,128 $ 131,473 $ 125,222
Hudson Yards North Tower Holdings LLC [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Business Acquisition [Line Items]          
Disposal Date Jun. 30, 2019        
Cash proceeds from sale of businesses and interest in affiliates     2,081    
Gain (Loss) on sale of investment     (100)    
Brookfield Infrastructure Partners [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Business Acquisition [Line Items]          
Disposal Date       Dec. 31, 2018  
Proceeds from assets sold       $ 1,100  
Gain (Loss) on sale of investment       432  
Property, Plant and Equipment - Net       298  
Goodwill       $ 215  
Auction 1000 [Member] | Spectrum Licenses [Member]          
Business Acquisition [Line Items]          
Disposal Date       Dec. 31, 2018  
Hulu [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]          
Business Acquisition [Line Items]          
Disposal Date   Apr. 30, 2019      
Cash proceeds from sale of businesses and interest in affiliates     1,430    
Gain (Loss) on sale of investment     $ 740