Annual report pursuant to Section 13 and 15(d)

Long-Term Debt (Debt) (Details)

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Long-Term Debt (Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Build to suit lease obligation $ 101 $ 105
Less debt issuance costs, net (22) (28)
Total debt and capital lease obligations 5,190 5,289
Less current portion (17) (14)
Long-term portion of debt and capital lease obligations 5,173 5,275
3.125% Senior Secured Notes due 2019, net of original issue discount    
Debt Instrument [Line Items]    
Debt and capital lease obligations 399 399
5.125% Senior Secured Notes due 2022    
Debt Instrument [Line Items]    
Debt and capital lease obligations 500 500
4.375% Senior Secured Notes due 2023, net of original issue discount    
Debt Instrument [Line Items]    
Debt and capital lease obligations 750 750
4.85% Senior Secured Notes due 2024, net of original issue discount    
Debt Instrument [Line Items]    
Debt and capital lease obligations 600 600
4.45% Senior Secured Notes due 2025, net of original issue discount    
Debt Instrument [Line Items]    
Debt and capital lease obligations 599 599
5.45% Senior Secured Notes due 2034, net of original issue discount    
Debt Instrument [Line Items]    
Debt and capital lease obligations 399 399
5.95% Senior Secured Notes due 2043, net of original issue discount    
Debt Instrument [Line Items]    
Debt and capital lease obligations 300 300
Senior secured credit facility    
Debt Instrument [Line Items]    
Debt and capital lease obligations 1,496 1,596
Capital lease obligations    
Debt Instrument [Line Items]    
Debt and capital lease obligations $ 68 $ 69