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, 2019
Dec. 06, 2019
Nov. 26, 2019
Dec. 31, 2018
Sep. 13, 2018
Debt Instrument [Line Items]          
Less debt issuance costs, net $ (40)     $ (25)  
Total debt and finance lease obligations 5,119     5,120  
Less current portion (18)     (421)  
Long-term portion of debt and finance lease obligations 5,101     4,699  
3.125% Senior Secured Notes due 2019, net of original issue discount          
Debt Instrument [Line Items]          
Debt and Lease Obligation 0     399  
5.125% Senior Secured Notes due 2022          
Debt Instrument [Line Items]          
Debt and Lease Obligation 500     500  
4.375% Senior Secured Notes due 2023, net of original issue discount          
Debt Instrument [Line Items]          
Debt and Lease Obligation 750     750  
4.85% Senior Secured Notes due 2024, net of original issue discount          
Debt Instrument [Line Items]          
Debt and Lease Obligation 600     600  
4.45% Senior Secured Notes due 2025, net of original issue discount          
Debt Instrument [Line Items]          
Debt and Lease Obligation 599     599  
5.45% Senior Secured Notes due 2034, net of original issue discount          
Debt Instrument [Line Items]          
Debt and Lease Obligation 399     399  
5.95% Senior Secured Notes due 2043, net of original issue discount          
Debt Instrument [Line Items]          
Debt and Lease Obligation 300     300  
6.375% Senior Secured Notes [Member]          
Debt Instrument [Line Items]          
Debt and Lease Obligation 225     225 $ 225
6.25% Senior Secured Notes [Member] [Member]          
Debt Instrument [Line Items]          
Debt and Lease Obligation 500 $ 500 $ 435 0  
Senior secured credit facility          
Debt Instrument [Line Items]          
Debt and Lease Obligation 1,105     1,185  
Finance lease obligations          
Debt Instrument [Line Items]          
Debt and Lease Obligation $ 181     $ 188