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Derivatives and Risk Management Activities - Commodity Price Risk Hedging (Details) bbl in Millions, MWh in Millions, Mcf in Billions	12 Months Ended
	Dec. 31, 2016 MWh bbl Mcf
Net long position associated with crude oil purchases
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf)	3.6
Net short time spread position hedging anticipated crude oil lease gathering purchases
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf)	5.2
Crude oil grade spread positions
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf)	43.8
Net short position related to anticipated sales of natural gas inventory and base gas requirements
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf) | Mcf	12.2
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)	34.5
PLA crude oil long call option position
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf)	0.9
Long natural gas position for natural gas purchases
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf) | Mcf	61.3
Short propane position related to subsequent sale of products
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf)	10.6
Short butane position related to subsequent sale of products
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf)	3.2
Short WTI position related to subsequent sale of products
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Mcf)	1.5
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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Nominal volume used to calculate payments on a derivative instrument.

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