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Debt, Senior Notes (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 29, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 30, 2017
Repayments of Long-term Debt [1]   $ 1 $ 2,070 $ 251  
Accrued interest and financing costs   $ 41 $ 40 [2]    
Debt Instrument, Face Amount $ 1,300        
Preferred Units, Outstanding   600,000 600,000    
6.125% Senior Notes due 2021          
Debt Instrument, Interest Rate, Stated Percentage   6.125%      
5.875% Senior Notes due 2020          
Debt Instrument, Interest Rate, Stated Percentage   5.875%      
6.250% Senior Notes Due 2022          
Debt Instrument, Interest Rate, Stated Percentage 6.25%        
Debt Instrument, Maturity Date Oct. 15, 2022        
6.375% Senior Notes due 2024          
Redemption premium, percentage of face value   35.00%      
Senior Notes [Member] | 7.5% Senior Notes due 2023 [Member]          
Debt Instrument, Interest Rate, Stated Percentage         7.50%
Repayments of Long-term Debt [1]     $ 326    
Accrued interest and financing costs         $ 4
Debt Instrument, Premium Paid         22
Debt Instrument, Face Amount         $ 300
Senior Notes [Member] | 6.125% Senior Notes due 2021          
Debt Instrument, Maturity Date   Aug. 31, 2021      
Senior Notes [Member] | 5.875% Senior Notes due 2020          
Debt Instrument, Maturity Date   Sep. 14, 2020      
Senior Notes [Member] | 5.5% Senior Notes due 2019          
Debt Instrument, Interest Rate, Stated Percentage   5.50%      
Debt Instrument, Maturity Date Oct. 15, 2019        
Debt Instrument, Face Amount $ 500        
Senior Notes [Member] | 6.250% Senior Notes Due 2022          
Debt Instrument, Interest Rate, Stated Percentage 6.25%        
Debt Instrument, Maturity Date Oct. 15, 2022        
Senior Notes   $ 300 300    
Debt Instrument, Face Amount $ 800        
Senior Notes [Member] | 6.250% Senior Notes Due 2022 | Debt Instrument, Redemption Period One          
Debt Instrument Redemption Premium Percentage   3.125%      
Senior Notes [Member] | 6.250% Senior Notes Due 2022 | Debt Instrument, Redemption Period Two          
Debt Instrument Redemption Premium Percentage   1.563%      
Senior Notes [Member] | 3.500% Senior Notes due 2022 [Member]          
Debt Instrument, Interest Rate, Stated Percentage   3.50%      
Debt Instrument, Maturity Date   Dec. 01, 2022      
Senior Notes   $ 500 500    
Debt Instrument, Face Amount     500    
Senior Notes [Member] | 6.375% Senior Notes due 2024          
Debt Instrument, Interest Rate, Stated Percentage   6.375%      
Debt Instrument, Maturity Date   May 01, 2024      
Senior Notes   $ 450 450    
Debt Instrument, Face Amount   $ 450      
Debt Instrument Redemption With Equity Proceeds   106.375%      
Senior Notes [Member] | 6.375% Senior Notes due 2024 | Debt Instrument, Redemption Period One          
Debt Instrument Redemption Premium Percentage   4.781%      
Senior Notes [Member] | 6.375% Senior Notes due 2024 | Debt Instrument, Redemption Period Two          
Debt Instrument Redemption Premium Percentage   3.188%      
Senior Notes [Member] | 6.375% Senior Notes due 2024 | Debt Instrument, Redemption, Period Three          
Debt Instrument Redemption Premium Percentage   1.594%      
Senior Notes [Member] | 5.250% Senior Notes due 2025          
Debt Instrument, Interest Rate, Stated Percentage   5.25%      
Debt Instrument, Maturity Date   Jan. 15, 2025      
Senior Notes   $ 750 750    
Debt Instrument, Face Amount   $ 750      
Redemption premium, percentage of face value   35.00%      
Senior Notes [Member] | 5.250% Senior Notes due 2025 | Debt Instrument, Redemption Period One          
Debt Instrument Redemption Premium Percentage   2.625%      
Senior Notes [Member] | 5.250% Senior Notes due 2025 | Debt Instrument, Redemption Period Two          
Debt Instrument Redemption Premium Percentage   1.313%      
Debt Instrument Redemption With Equity Proceeds   105.25%      
Senior Notes [Member] | 4.250% Senior Notes due 2027 [Member]          
Debt Instrument, Interest Rate, Stated Percentage   4.25%      
Debt Instrument, Maturity Date   Dec. 01, 2027      
Senior Notes   $ 750 750    
Senior Notes [Member] | 5.200% Senior Notes due 2047 [Member]          
Debt Instrument, Interest Rate, Stated Percentage   5.20%      
Debt Instrument, Maturity Date   Dec. 01, 2047      
Senior Notes   $ 500 $ 500    
[1] All periods include the historical results of the Predecessors. See Notes 1 and 2 for further discussion.
[2] Adjusted to include the historical results of the Predecessors. See Notes 1 and 2 for further discussion.