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Derivatives and Risk Management Activities - Commodity Price Risk Hedging (Details) bbl in Millions, Mcf in Millions, MWh in Millions | 3 Months Ended
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Mar. 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) | 3.3
Net short time spread position hedging anticipated crude oil lease gathering purchases |
Commodity Price Risk Hedging: |
Derivative position notional amount (in barrels or Mcf) | 6.7
Crude oil grade basis position |
Commodity Price Risk Hedging: |
Derivative position notional amount (in barrels or Mcf) | 36.4
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) | 14.9
PLA short position consisting of crude oil futures |
Commodity Price Risk Hedging: |
Derivative position notional amount (in barrels or Mcf) | 1.1
PLA 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 | 51.3
Short propane position related to subsequent sale of products |
Commodity Price Risk Hedging: |
Derivative position notional amount (in barrels or Mcf) | 7.9
Short butane position related to subsequent sale of products |
Commodity Price Risk Hedging: |
Derivative position notional amount (in barrels or Mcf) | 2.4
Short WTI position related to subsequent sale of products |
Commodity Price Risk Hedging: |
Derivative position notional amount (in barrels or Mcf) | 0.8
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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