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Recent Accounting Pronouncements and Tax Reform (Effects of Changes in Revenue Recognition - Balance Sheet) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total current assets $ 18,215 $ 16,343    
Film and television costs 7,411 7,087    
Other intangible assets, net 18,848 18,133    
Other noncurrent assets, net 3,744 4,354    
Assets 191,248 187,462    
Total current liabilities 19,007 21,993    
Deferred income taxes 25,140 24,259    
Other noncurrent liabilities 12,069 10,972    
Total equity 71,743 69,459 $ 55,851 $ 56,163
Total liabilities and equity 191,248 187,462    
NBCUniversal Media LLC [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total current assets 10,584 11,957    
Film and television costs 7,401 7,082    
Other noncurrent assets, net 1,781 1,804    
Assets 71,885 71,300    
Total current liabilities 7,483 9,932    
Other noncurrent liabilities 5,138 4,153    
Total equity 45,085 43,041 $ 41,277 $ 40,875
Total liabilities and equity $ 71,885 71,300    
Previous Reported [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total current assets   16,060    
Film and television costs   7,076    
Other intangible assets, net   18,779    
Other noncurrent assets, net   3,489    
Assets   186,949    
Total current liabilities   21,561    
Deferred income taxes   24,256    
Other noncurrent liabilities   10,904    
Total equity   69,449    
Total liabilities and equity   186,949    
Previous Reported [Member] | NBCUniversal Media LLC [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total current assets   11,673    
Film and television costs   7,071    
Other noncurrent assets, net   1,872    
Assets   71,073    
Total current liabilities   9,602    
Other noncurrent liabilities   4,109    
Total equity   43,188    
Total liabilities and equity   71,073    
Effects of Adoption [Member] | Accounting Standards Update 2014-09 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total current assets   283    
Film and television costs   11    
Other intangible assets, net   (646)    
Other noncurrent assets, net   865    
Assets   513    
Total current liabilities   432    
Deferred income taxes   3    
Other noncurrent liabilities   68    
Total equity   10    
Total liabilities and equity   513    
Effects of Adoption [Member] | Accounting Standards Update 2014-09 [Member] | NBCUniversal Media LLC [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total current assets   284    
Film and television costs   11    
Other noncurrent assets, net   (68)    
Assets   227    
Total current liabilities   330    
Other noncurrent liabilities   44    
Total equity   (147)    
Total liabilities and equity   $ 227