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Significant Transactions (Sky Transaction) (Details)
£ / shares in Units, $ in Millions, £ in Billions
12 Months Ended
Oct. 09, 2018
USD ($)
Oct. 09, 2018
GBP (£)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Oct. 09, 2018
£ / shares
Customer Relationships [Member]          
Business Acquisition [Line Items]          
Estimated weighted average useful life     14 years    
Sky Limited [Member]          
Business Acquisition [Line Items]          
Shares acquired, share price (in gbp per share) | £ / shares         £ 17.28
Percentage of voting interests acquired in period 100.00% 100.00%      
Cash consideration $ 39,387 £ 30.2      
Deferred tax assets related to net operating losses       $ 1,200  
Goodwill purchase accounting adjustment     $ 1,400    
Incremental depreciation and amortization     $ 53    
Property and equipment 4,127        
Sky Limited [Member] | Trade Names [Member]          
Business Acquisition [Line Items]          
Indefinite-lived intangible assets acquired 5,800        
Sky Limited [Member] | Customer Relationships [Member]          
Business Acquisition [Line Items]          
Finite-lived intangible assets acquired $ 9,500        
Sky Limited [Member] | Customer Relationships [Member] | Minimum [Member]          
Business Acquisition [Line Items]          
Estimated weighted average useful life 6 years 6 years      
Sky Limited [Member] | Customer Relationships [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Estimated weighted average useful life 19 years 19 years      
Sky Limited [Member] | Developed Technology and Software [Member]          
Business Acquisition [Line Items]          
Finite-lived intangible assets acquired $ 4,300        
Sky Limited [Member] | Developed Technology and Software [Member] | Minimum [Member]          
Business Acquisition [Line Items]          
Estimated weighted average useful life 4 years 4 years      
Sky Limited [Member] | Developed Technology and Software [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Estimated weighted average useful life 9 years 9 years      
Customer Premise Equipment [Member]          
Business Acquisition [Line Items]          
Estimated useful lives     6 years    
Customer Premise Equipment [Member] | Sky Limited [Member]          
Business Acquisition [Line Items]          
Property and equipment $ 1,400        
Customer Premise Equipment [Member] | Sky Limited [Member] | Minimum [Member]          
Business Acquisition [Line Items]          
Estimated useful lives 5 years 5 years      
Customer Premise Equipment [Member] | Sky Limited [Member] | Maximum [Member]          
Business Acquisition [Line Items]          
Estimated useful lives 7 years 7 years