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Derivatives and Risk Management Activities - Commodity Price Risk Hedging (Details)
bbl in Millions
6 Months Ended
Jun. 30, 2019
TWh
bbl
Bcf
MMBbls
Net long position associated with crude oil purchases  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels, MMbls 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, MMbls or Bcf) 6.0
Net crude oil basis spread position  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels, MMbls or Bcf) 36.2
Net short position related to anticipated net sales of crude oil and NGL inventory  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels, MMbls or Bcf) 5.6
Positions hedging risk of not utilizing storage capacity  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels, MMbls or Bcf) 0.9
PLA short position consisting of crude oil futures  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels, MMbls or Bcf) 1.3
PLA long call option position  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels, MMbls or Bcf) 2.4
Long natural gas position for natural gas purchases and operational needs  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels, MMbls or Bcf) | Bcf 77.8
Short propane position related to subsequent sale of products  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels, MMbls or Bcf) | MMBbls 10.8
Short butane position related to subsequent sale of products  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels, MMbls or Bcf) | MMBbls 3.2
Short condensate WTI position related to subsequent sale of products  
Commodity Price Risk Hedging:  
Derivative position notional amount (in barrels, MMbls or Bcf) | MMBbls 1.2
Long power position for power supply requirements  
Commodity Price Risk Hedging:  
Derivative position notional amount (in Terawatt hours) | TWh 1.1