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Derivatives and Risk Management Activities - Commodity Price Risk Hedging (Details) bbl in Millions, Mcf in Millions, MWh in Millions	9 Months Ended
	Sep. 30, 2016 MWh bbl Mcf
Net long position associated with crude oil purchases
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf)	4.4
Net short time spread position hedging anticipated crude oil lease gathering purchases
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf)	3.1
Crude oil grade spread position
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf)	16.0
Net short position related to anticipated sales of natural gas inventory
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf) | Mcf	12.9
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)	34.7
PLA oil long call option position
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf)	1.1
Long natural gas position for natural gas purchases
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf) | Mcf	31.6
Natural gas processing needs
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf) | Mcf	27.7
Natural gas operational needs
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf) | Mcf	3.9
Short propane position related to subsequent sale of products
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf)	5.1
Short butane position related to subsequent sale of products
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf)	1.6
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	0.4

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- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

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