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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details) $ in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) $ / $	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) $ / $	Jun. 30, 2020 USD ($)	Jun. 30, 2021 CAD ($) $ / $	Dec. 31, 2020 USD ($)
Foreign Currency Derivatives \| Derivatives Not Designated as a Hedge \| Supply and Logistics segment revenues
Currency Exchange Rate Risk Hedging:
Gain/(loss) recognized in earnings \| $	$ 2	$ 2	$ 3	$ (4)
Forward exchange contracts that exchange CAD for USD maturing in 2021
Currency Exchange Rate Risk Hedging:
Notional amount of derivatives	$ 144		$ 144		$ 177
Forward exchange contracts that exchange CAD for USD maturing in 2021 \| Minimum
Currency Exchange Rate Risk Hedging:
Average exchange rate (cad per usd)	1.00		1.00		1.00
Forward exchange contracts that exchange CAD for USD maturing in 2021 \| Maximum
Currency Exchange Rate Risk Hedging:
Average exchange rate (cad per usd)	1.23		1.23		1.23
Forward exchange contracts that exchange USD for CAD maturing in 2021
Currency Exchange Rate Risk Hedging:
Notional amount of derivatives	$ 142		$ 142		$ 172
Forward exchange contracts that exchange USD for CAD maturing in 2021 \| Minimum
Currency Exchange Rate Risk Hedging:
Average exchange rate (cad per usd)	1.00		1.00		1.00
Forward exchange contracts that exchange USD for CAD maturing in 2021 \| Maximum
Currency Exchange Rate Risk Hedging:
Average exchange rate (cad per usd)	1.21		1.21		1.21
Interest Rate Derivatives \| Derivatives in Hedging Relationships \| Other current assets
Currency Exchange Rate Risk Hedging:
Derivative asset \| $						$ 2
Interest Rate Derivatives \| Derivatives in Hedging Relationships \| Other current assets \| Maximum
Currency Exchange Rate Risk Hedging:
Derivative asset \| $	$ 1		$ 1