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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, 2020 USD ($) $ / $ | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) $ / $ | Jun. 30, 2019 USD ($) | Jun. 30, 2020 CAD ($) $ / $ | Dec. 31, 2019 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 | $ (4) | $ 7 |  |
Forward exchange contracts that exchange CAD For USD maturing in 2020 |  |  |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |  |  |
Notional amount of derivatives | $ 185 |  | $ 185 |  | $ 252 |
Forward exchange contracts that exchange CAD For USD maturing in 2020 | 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 2020 | Maximum |  |  |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |  |  |
Average exchange rate (cad per usd) | 1.36 |  | 1.36 |  | 1.36 |
Forward exchange contracts that exchange USD for CAD maturing in 2020 |  |  |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |  |  |
Notional amount of derivatives | $ 275 |  | $ 275 |  | $ 371 |
Forward exchange contracts that exchange USD for CAD maturing in 2020 | 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 2020 | Maximum |  |  |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |  |  |
Average exchange rate (cad per usd) | 1.35 |  | 1.35 |  | 1.35 |
Interest Rate Derivatives | Derivatives in Hedging Relationships | Other current liabilities |  |  |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |  |  |
Derivative liability | $ | $ 2 |  | $ 2 |  |  | $ 1
Interest Rate Derivatives | Derivatives in Hedging Relationships | Other current assets |  |  |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |  |  |
Derivative asset | $ |  |  |  |  |  | $ 2

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