Quarterly report pursuant to Section 13 or 15(d)

Debt - Schedule of Debt (Details)

v3.10.0.1
Debt - Schedule of Debt (Details) - USD ($)
Sep. 30, 2018
May 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Fair value of interest rate swap agreements $ (147,000,000)   $ (71,000,000)
Total senior notes 6,258,000,000   4,535,000,000
Mortgage notes payable 59,000,000   61,000,000
Construction loan payable 40,000,000   0
Capital leases and other 5,000,000   18,000,000
Debt issuance costs (79,000,000)   (65,000,000)
Total debt 6,383,000,000   4,699,000,000
Less current portion (4,000,000)   (4,000,000)
Long-term debt 6,379,000,000   4,695,000,000
Revolving credit agreement      
Debt Instrument [Line Items]      
Revolving credit agreement 100,000,000   150,000,000
Senior Notes | $1,400 million 5.625% Senior notes, due February 15, 2021      
Debt Instrument [Line Items]      
Debt, face amount $ 1,400,000,000    
Interest rate 5.625%    
Senior notes $ 1,400,000,000   1,400,000,000
Senior Notes | $1,000 million 4.75% Senior notes, due May 15, 2022      
Debt Instrument [Line Items]      
Debt, face amount $ 1,000,000,000    
Interest rate 4.75%    
Senior notes $ 1,005,000,000   1,006,000,000
Senior Notes | $1,000 million 6.125% Senior notes, due February 15, 2024      
Debt Instrument [Line Items]      
Debt, face amount $ 1,000,000,000    
Interest rate 6.125%    
Senior notes $ 1,000,000,000   1,000,000,000
Senior Notes | $1,200 million 4.75% Senior notes, due January 15, 2025      
Debt Instrument [Line Items]      
Debt, face amount $ 1,200,000,000    
Interest rate 4.75%    
Senior notes $ 1,200,000,000   1,200,000,000
Senior Notes | $1,800 million 5.375% Senior notes, due June 1, 2026      
Debt Instrument [Line Items]      
Debt, face amount $ 1,800,000,000 $ 1,800,000,000  
Interest rate 5.375% 5.375%  
Senior notes $ 1,800,000,000   $ 0