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Derivatives and Risk Management Activities - Commodity Price Risk Hedging (Details)
bbl in Millions, Mcf in Millions, MWh in Millions
 6 Months Ended
Jun. 30, 2017
MWh
Mcf
bbl
Net long position associated with crude oil purchases  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Mcf) 1.4
Net short time spread position hedging anticipated crude oil lease gathering purchases  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Mcf) 2.5
Crude oil grade basis position  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Mcf) 37.5
Net short position related to anticipated net sales of crude oil and NGL inventory  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Mcf) 16.7
PLA oil long call option position  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Mcf) 0.7
Long natural gas position for natural gas purchases  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Mcf) | Mcf 56,600.0
Short propane position related to subsequent sale of products  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Mcf) 8.5
Short butane position related to subsequent sale of products  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Mcf) 2.6
Short WTI position related to subsequent sale of products  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Mcf) 0.7
Long power position for power supply requirements  
Commodity Price Risk Hedging:  
Derivative position notional amount (in megawatt hours) | MWh 0.5