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Derivatives and Risk Management Activities - Commodity Price Risk Hedging (Details)
bbl in Millions
12 Months Ended
Dec. 31, 2020
TWh
bbl
MMBbls
Bcf
Net long position associated with crude oil purchases  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Bcf) 5.8
Net short time spread position hedging anticipated crude oil lease gathering purchases  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Bcf) 6.6
Net crude oil grade basis position  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Bcf) 0.6
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 Bcf) 37.4
Long natural gas position for natural gas purchases for processing and operational needs  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Bcf) | Bcf 37.3
Short propane position related to subsequent sale of products  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Bcf) | MMBbls 6.3
Short butane position related to subsequent sale of products  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Bcf) | MMBbls 2.3
Short condensate WTI position related to subsequent sale of products  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Bcf) | MMBbls 0.6
Long fuel gas position for fuel gas requirements  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels or Bcf) | Bcf 14.3
Long power position for power supply requirements  
Commodity Price Risk Hedging:  
Derivative position notional amount (in terawatt hours) | TWh 0.7