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Debt - Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Apr. 01, 2018
Mar. 01, 2017
Debt Instrument [Line Items]        
Long-term debt, gross $ 8,076 $ 7,361    
Unamortized deferred financing costs and discount (83) (79)    
Current maturities of long-term debt [1] (37) (16)    
Long-term debt 7,956 7,266    
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 1,500    
Debt Instrument, Face Amount     $ 1,500  
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 Notes due 2030 [Member]        
Debt Instrument [Line Items]        
Long-term debt, gross $ 1,000 0    
Debt Instrument, Face Amount $ 1,000      
Debt instrument, interest rate, stated percentage 4.875%      
Finance lease liabilities [member]        
Debt Instrument [Line Items]        
Long-term debt, gross $ 245 225    
Long-term Debt, Weighted Average Interest Rate, at Point in Time 5.83%      
Other debt [member]        
Debt Instrument [Line Items]        
Long-term debt, gross $ 17 $ 17    
Long-term Debt, Weighted Average Interest Rate, at Point in Time 3.08%      
[1] Represents current maturities of finance lease liabilities.