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Debt Obligations - Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Feb. 19, 2014
Debt Instrument      
Junior Subordinated Notes $ 54 $ 54  
Other Long-term Debt 5 5  
Unamortized Net Premiums And Fair Value Adjustments 51 76  
Total debt outstanding 1,141 1,166  
Less: Current maturities of long-term debt 307 1  
Long-term Debt, Excluding Current Maturities 834 1,165  
6.20% Senior Notes due 2017      
Debt Instrument      
Senior Notes 300 $ 300  
Debt Instrument, Interest Rate, Stated Percentage   6.20%  
Senior Notes due 2018 [Member]      
Debt Instrument      
Senior Notes 400 $ 400  
Debt Instrument, Interest Rate, Stated Percentage   7.00%  
8.125% Senior Notes due 2019      
Debt Instrument      
Senior Notes 150 $ 150  
Debt Instrument, Interest Rate, Stated Percentage   8.125%  
7.60% Senior Notes, due February 1, 2024 [Member]      
Debt Instrument      
Senior Notes 82 $ 82  
Senior Notes Due 2029 [Member]      
Debt Instrument      
Senior Notes 66 66  
8.25% Senior Notes, due November 14, 2029 [Member]      
Debt Instrument      
Senior Notes 33 $ 33  
Junior Subordinated Debt [Member]      
Debt Instrument      
Senior Notes 54    
Panhandle [Member]      
Debt Instrument      
Junior Subordinated Notes $ 600    
ETP [Member]      
Debt Instrument      
NOTE PAYABLE TO RELATED PARTY     $ 1,090