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Derivatives and Risk Management Activities - Commodity Price Risk Hedging (Details) bbl in Millions, Mcf in Millions, MWh in Millions | 12 Months Ended
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Dec. 31, 2018 MWh Mcf bbl
Net long position associated with crude oil purchases |
Commodity Price Risk Hedging: |
Derivative position notional amount (in barrels or Mcf) | 3.4
Net short time spread position hedging anticipated crude oil lease gathering purchases |
Commodity Price Risk Hedging: |
Derivative position notional amount (in barrels or Mcf) | 10.1
Crude oil grade basis position |
Commodity Price Risk Hedging: |
Derivative position notional amount (in barrels or Mcf) | 54.6
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) | 6.1
PLA net short position consisting of crude oil futures related to anticipated sales |
Commodity Price Risk Hedging: |
Derivative position notional amount (in barrels or Mcf) | 1.2
PLA oil long call option position related to anticipated sales |
Commodity Price Risk Hedging: |
Derivative position notional amount (in barrels or Mcf) | 2.4
Long natural gas position for natural gas purchases |
Commodity Price Risk Hedging: |
Derivative position notional amount (in barrels or Mcf) | Mcf | 44.1
Short propane position related to subsequent sale of products |
Commodity Price Risk Hedging: |
Derivative position notional amount (in barrels or Mcf) | 6.4
Short butane position related to subsequent sale of products |
Commodity Price Risk Hedging: |
Derivative position notional amount (in barrels or Mcf) | 2.0
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 | 0.3

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