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Derivative Assets And Liabilities (Interest Rate Swaps Outstanding) (Details) - Interest Rate Derivatives [Member] - ETP [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
December 2018 [Member]    
Notional Amount $ 1,200 $ 1,200
Type [1] Pay a floating rate based on a 3-month LIBOR and receive a fixed rate of 1.53%  
March 2019 [Member]    
Notional Amount $ 300 300
Type [1] Pay a floating rate based on a 3-month LIBOR and receive a fixed rate of 1.42%  
Forward-Starting Swaps [Member] | July 2016 [Member]    
Notional Amount [2] $ 0 200
Type [1],[2] Forward-starting to pay a fixed rate of 3.80% and receive a floating rate  
Forward-Starting Swaps [Member] | July 2017 [Member]    
Notional Amount [3] $ 500 300
Type [1],[3] Forward-starting to pay a fixed rate of 3.90% and receive a floating rate  
Forward-Starting Swaps [Member] | July 2018 [Member]    
Notional Amount [3] $ 200 200
Type [1],[3] Forward-starting to pay a fixed rate of 4.00% and receive a floating rate  
Forward-Starting Swaps [Member] | July 2019 [Member]    
Notional Amount [3] $ 200 $ 200
Type [1],[3] Forward-starting to pay a fixed rate of 3.25% and receive a floating rate  
[1] (1) Floating rates are based on 3-month LIBOR.
[2] (2) Represents the effective date. These forward-starting swaps have terms of 10 and 30 years with a mandatory termination date the same as the effective date.
[3] (3) Represents the effective date. These forward-starting swaps have a term of 30 years with a mandatory termination date the same as the effective date.