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Debt Obligations - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Feb. 19, 2014
Jun. 24, 2013
Debt Instrument        
Debt Instrument, Unamortized Discount (Premium), Net $ 12      
Debt Instrument, Fair Value Disclosure 1,200 $ 1,240    
Long term debt, amount outstanding 1,166 1,190    
Junior Subordinated Notes 54 54    
Unamortized Net Premiums And Fair Value Adjustments 76 $ 99    
7.60% Senior Notes, due February 1, 2024 [Member]        
Debt Instrument        
Senior Notes 82      
Debt Instrument, Interest Rate, Stated Percentage       7.60%
8.25% Senior Notes, due November 14, 2029 [Member]        
Debt Instrument        
Senior Notes 33      
Debt Instrument, Interest Rate, Stated Percentage       8.25%
Junior Subordinated Debt [Member]        
Debt Instrument        
Senior Notes 54      
3.26% Junior Subordinated Notes due November 1, 2066 [Member]        
Debt Instrument        
Debt Instrument, Interest Rate, Stated Percentage   3.0175%    
Long-term Debt, Weighted Average Interest Rate       3.295%
ETP [Member]        
Debt Instrument        
NOTE PAYABLE TO RELATED PARTY     $ 1,090  
Panhandle [Member]        
Debt Instrument        
Junior Subordinated Notes $ 600