Derivatives and Risk Management Activities - Commodity Price Risk Hedging (Details) bbl in Millions	12 Months Ended
	Dec. 31, 2021 TWh MMBbls bbl Bcf
Crude oil purchases | Long
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Bcf)	8.4
Time spread on hedging anticipated crude oil lease gathering purchases | Short
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Bcf)	5.7
Crude oil basis spread position
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Bcf)	7.3
Anticipated net sales of crude oil and NGL inventory | Short
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Bcf)	19.2
Natural gas purchases for processing and operational needs | Long
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Bcf) | Bcf	73.4
Propane contracts related to subsequent sale of products | Short
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Bcf) | MMBbls	13.7
Butane contracts related to subsequent sale of products | Short
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Bcf) | MMBbls	3.3
Condensate contracts related to subsequent sale of products | Short
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Bcf) | MMBbls	1.5
Fuel gas requirements | Long
Commodity Price Risk Hedging:
Derivative position notional amount (in barrels or Bcf) | Bcf	7.5
Power supply requirements | Long
Commodity Price Risk Hedging:
Derivative position notional amount (in terawatt hours) | TWh	0.6