Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt (Debt) (Details)

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Long-Term Debt (Debt) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Jul. 01, 2019
Sep. 13, 2018
Jun. 15, 2016
Mar. 18, 2014
Debt Instrument [Line Items]            
Derivative, Notional Amount     $ 125   $ 125  
Debt Issuance Costs $ (24) $ (25)        
Total debt and finance lease obligations 5,133 5,120        
Less current portion (18) (421)        
Long-term portion of debt and finance lease obligations 5,115 4,699        
3.125% Senior Secured Notes due 2019, net of original issue discount            
Debt Instrument [Line Items]            
Debt and Lease Obligation $ 0 399        
Debt Instrument, Interest Rate, Stated Percentage 3.125%         3.125%
5.125% Senior Secured Notes due 2022            
Debt Instrument [Line Items]            
Debt and Lease Obligation $ 500 500        
Debt Instrument, Interest Rate, Stated Percentage 5.125%          
4.375% Senior Secured Notes due 2023, net of original issue discount            
Debt Instrument [Line Items]            
Debt and Lease Obligation $ 750 750        
Debt Instrument, Interest Rate, Stated Percentage 4.375%          
4.85% Senior Secured Notes due 2024, net of original issue discount            
Debt Instrument [Line Items]            
Debt and Lease Obligation $ 600 600        
Debt Instrument, Interest Rate, Stated Percentage 4.85%          
4.45% Senior Secured Notes due 2025, net of original issue discount            
Debt Instrument [Line Items]            
Debt and Lease Obligation $ 599 599        
Debt Instrument, Interest Rate, Stated Percentage 4.45%          
5.45% Senior Secured Notes due 2034, net of original issue discount            
Debt Instrument [Line Items]            
Debt and Lease Obligation $ 399 399        
Debt Instrument, Interest Rate, Stated Percentage 5.45%          
5.95% Senior Secured Notes due 2043, net of original issue discount            
Debt Instrument [Line Items]            
Debt and Lease Obligation $ 300 300        
Debt Instrument, Interest Rate, Stated Percentage 5.95%          
6.375% Senior Secured Notes [Member]            
Debt Instrument [Line Items]            
Debt and Lease Obligation $ 225 225   $ 225    
Debt Instrument, Interest Rate, Stated Percentage 6.375%     6.375%    
Senior secured credit facility            
Debt Instrument [Line Items]            
Debt and Lease Obligation $ 1,615 1,185        
Finance lease obligations            
Debt Instrument [Line Items]            
Debt and Lease Obligation $ 169 $ 188