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Acquisitions, Dispositions And Other Adjustments (Fair Value of Assets Acquired And Liabilities Assumed) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Jun. 14, 2018
Dec. 31, 2017
Assets acquired        
Noncurrent inventories and theatrical film and television production costs $ 12,434 $ 7,713    
Goodwill 146,241 146,370   $ 105,449
Liabilities assumed        
Debt maturing within one year $ 11,838 $ 10,255    
Time Warner Inc. [Member]        
Assets acquired        
Cash     $ 1,889  
Accounts Receivable     9,020  
All other current assets     2,913  
Noncurrent inventories and theatrical film and television production costs     5,591  
Property, plant and equipment     4,693  
Investments and other assets     9,438  
Goodwill     38,801  
Total assets acquired     129,572  
Liabilities assumed        
Current liabilities, excluding current portion of long-term debt     8,294  
Debt maturing within one year     4,471  
Long-term debt     18,394  
Other noncurrent liabilities     19,054  
Total liabilities assumed     50,213  
Net assets acquired     79,359  
Noncontrolling interest     (1)  
Aggregate value of consideration paid     79,358  
Time Warner Inc. [Member] | Distribution Networks [Member]        
Assets acquired        
Intangible assets subject to amortization     18,040  
Time Warner Inc. [Member] | Released television and film content [Member]        
Assets acquired        
Intangible assets subject to amortization     10,806  
Time Warner Inc. [Member] | Trademarks and trade names [Member]        
Assets acquired        
Intangible assets subject to amortization     18,081  
Time Warner Inc. [Member] | Other [Member]        
Assets acquired        
Intangible assets subject to amortization     $ 10,300