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
Sep. 30, 2015
Apr. 15, 2015
Dec. 31, 2014
Debt Instrument [Line Items]      
Debt and Capital Lease Obligations $ 4,543   $ 4,629
Less current portion (9)   (9)
Long-term portion of debt and capital lease obligations 4,534   4,620
3.125% Senior Secured Notes due 2019, net of original issue discount      
Debt Instrument [Line Items]      
Debt and Capital Lease Obligations $ 399   399
Debt instrument interest rate stated percentage 3.125%    
7.375% Senior Secured Notes due 2020      
Debt Instrument [Line Items]      
Debt and Capital Lease Obligations $ 0   500
Debt instrument interest rate stated percentage 7.375% 7.375%  
5.125% Senior Secured Notes due 2022      
Debt Instrument [Line Items]      
Debt and Capital Lease Obligations $ 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 Capital Lease Obligations $ 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 Capital Lease Obligations $ 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 Capital Lease Obligations $ 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 Capital Lease Obligations $ 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 Capital Lease Obligations $ 300   300
Debt instrument interest rate stated percentage 5.95%    
Senior secured credit facility      
Debt Instrument [Line Items]      
Debt and Capital Lease Obligations $ 920   508
Capital lease obligations      
Debt Instrument [Line Items]      
Debt and Capital Lease Obligations $ 76   $ 74