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Long-Term Debt (Narrative) (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Feb. 28, 2019
GBP (£)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Total fair value of debt $ 115,800,000,000   $ 114,100,000,000
Cumulative translation gains (losses) related to net investment hedges recorded in AOCI 637,000,000   (751,000,000)
Maximum borrowing capacity of revolving credit facilities 9,200,000,000    
Potential increase of maximum borrowing capacity of revolving credit facilities 12,000,000,000    
Amounts available under revolving credit facilities 9,200,000,000    
Unused irrevocable standby letters of credit and bank guarantees 484,000,000    
NBCUniversal Media LLC [Member]      
Debt Instrument [Line Items]      
Total fair value of debt 11,000,000,000.0   13,200,000,000
Cumulative translation gains (losses) related to net investment hedges recorded in AOCI $ 120,000,000   102,000,000
Ownership in cable holding company subsidiaries 100.00%    
NBCUniversal Enterprise [Member] | NBCUniversal Media LLC [Member]      
Debt Instrument [Line Items]      
Related party aggregate principal amount senior notes not subject to guarantee $ 1,500,000,000    
Related party liquidation preference preferred stock not subject to guarantee $ 725,000,000    
London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Borrowing margin for LIBOR based borrowings 1.00%    
Comcast, Comcast Cable And NBCUniversal Debt Securities [Member]      
Debt Instrument [Line Items]      
Principal amount of debt securities subject to guarantee $ 88,300,000,000    
Comcast And Comcast Cable Debt Securities [Member] | NBCUniversal Media LLC [Member]      
Debt Instrument [Line Items]      
Principal amount of debt securities subject to guarantee 82,500,000,000    
NBCUniversal Enterprise Debt Securities [Member]      
Debt Instrument [Line Items]      
Principal amount of debt securities subject to guarantee 1,500,000,000    
Universal Studios Japan Term Loans [Member]      
Debt Instrument [Line Items]      
Principal amount of debt securities subject to guarantee 2,500,000,000    
Sky Debt Securities [Member]      
Debt Instrument [Line Items]      
Principal amount of debt securities subject to guarantee 9,200,000,000    
Principal amount of debt securities subject to guarantee maturing within the next 5 years 6,000,000,000.0    
Comcast Revolving Credit Facility due 2022 [Member] | NBCUniversal Media LLC [Member]      
Debt Instrument [Line Items]      
Guarantee obligations, maximum capacity of credit facility 7,600,000,000    
Sky Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Net repayments of credit facility 615,000,000    
Credit facility terminated | £   £ 1,000,000,000  
Cash Flow Hedging [Member]      
Debt Instrument [Line Items]      
Amount of foreign currency denominated debt hedged 3,700,000,000   3,700,000,000
Cash Flow Hedging [Member] | Currency Swap [Member]      
Debt Instrument [Line Items]      
Aggregate asset (liability) fair value 373,000,000   399,000,000
Net Investment Hedging [Member]      
Debt Instrument [Line Items]      
Amount of net investment in foreign subsidiaries hedged 14,000,000,000.0   15,600,000,000
Net Investment Hedging [Member] | Currency Swaps And Foreign Currency Denominated Debt [Member]      
Debt Instrument [Line Items]      
Cumulative translation gains (losses) related to net investment hedges recorded in AOCI 339,000,000   (4,000,000)
Net Investment Hedging [Member] | Currency Swap [Member]      
Debt Instrument [Line Items]      
Aggregate asset (liability) fair value $ (373,000,000)   $ (587,000,000)