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Debt - Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Apr. 01, 2018
Dec. 31, 2017
Mar. 01, 2017
Debt Instrument [Line Items]        
Long-term debt, gross $ 7,361   $ 6,683  
Unamortized deferred financing costs and discount (79)   (81)  
Current maturities of long-term debt [1] (16)   (46)  
Long-term debt 7,266   6,556  
Senior notes due 2024 [member]        
Debt Instrument [Line Items]        
Long-term debt, gross $ 1,000   1,000  
Debt instrument, interest rate, stated percentage 4.25%      
Senior notes due 2025 [member]        
Debt Instrument [Line Items]        
Long-term debt, gross $ 900   900  
Debt instrument, interest rate, stated percentage 4.625%     4.625%
Senior notes due 2026 [member]        
Debt Instrument [Line Items]        
Long-term debt, gross $ 1,500   0  
Debt instrument, interest rate, stated percentage 5.125% 5.125%    
Senior notes due 2027 [member]        
Debt Instrument [Line Items]        
Long-term debt, gross $ 600   600  
Debt instrument, interest rate, stated percentage 4.875%     4.875%
Senior secured term loan facility due 2023 [member]        
Debt Instrument [Line Items]        
Long-term debt, gross $ 3,119   3,929  
Debt instrument, interest rate, stated percentage 4.26%      
Capital lease obligations [member]        
Debt Instrument [Line Items]        
Long-term debt, gross $ 225   233  
Debt instrument, weighted average interest rate 6.43%      
Other debt obligations [member]        
Debt Instrument [Line Items]        
Long-term debt, gross $ 17   $ 21  
Debt instrument, weighted average interest rate 3.08%      
[1] Balance as of December 31, 2017 is net of unamortized deferred financing costs and discount attributable to current maturities of long-term debt.