Quarterly report pursuant to Section 13 or 15(d)

Debt (Schedule of Debt) (Details)

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Debt (Schedule of Debt) (Details) - USD ($)
Sep. 30, 2016
Jun. 30, 2016
Mar. 24, 2016
Feb. 29, 2016
Dec. 31, 2015
Apr. 30, 2014
Debt Instrument [Line Items]            
Fair value of interest rate swap agreements $ 25,000,000       $ 9,000,000  
Total senior notes 4,270,000,000       937,000,000  
Mortgage notes payable 65,000,000       67,000,000  
Capital leases and other 18,000,000       6,000,000  
Debt issuance costs (64,000,000)       (14,000,000)  
Total debt 4,589,000,000       1,221,000,000  
Less current portion (845,000,000)       (5,000,000)  
Long term debt 3,744,000,000       1,216,000,000  
Revolving credit agreement            
Debt Instrument [Line Items]            
Revolving credit agreement 300,000,000       225,000,000  
Senior Notes | $425 million 5.75% Senior notes, due June 1, 2017            
Debt Instrument [Line Items]            
Debt, face amount $ 425,000,000          
Interest rate, stated 5.75%          
Senior notes $ 426,000,000       428,000,000  
Senior Notes | $400 million 6.375% Senior notes, due June 1, 2017            
Debt Instrument [Line Items]            
Debt, face amount $ 400,000,000   $ 400,000,000      
Interest rate, stated 6.375%   6.375%      
Senior notes $ 411,000,000       0  
Senior Notes | $1,400 million 5.625% Senior notes, due February 15, 2021            
Debt Instrument [Line Items]            
Debt, face amount $ 1,400,000,000     $ 1,400,000,000    
Interest rate, stated 5.625%     5.625%    
Senior notes $ 1,400,000,000       0  
Senior Notes | $1,000 million 4.75% Senior notes, due May 15, 2022            
Debt Instrument [Line Items]            
Debt, face amount $ 1,000,000,000         $ 500,000,000
Interest rate, stated 4.75% 4.75%       4.75%
Senior notes $ 1,008,000,000       500,000,000  
Senior Notes | $1,000 million 6.125% Senior notes, due February 15, 2024            
Debt Instrument [Line Items]            
Debt, face amount $ 1,000,000,000     $ 1,000,000,000    
Interest rate, stated 6.125%     6.125%    
Senior notes $ 1,000,000,000       $ 0