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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details) $ in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 USD ($) $ / $ | Mar. 31, 2019 USD ($) | Mar. 31, 2020 CAD ($) $ / $ | 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 | $ | $ (6) | $ 5 |  |
Forward exchange contracts that exchange CAD for USD maturing in 2020 |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |
Notional amount of derivatives | $ 132 |  | $ 175 |
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 |
Forward exchange contracts that exchange CAD for USD maturing in 2020 | Maximum |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |
Average exchange rate (cad per usd) | 1.32 |  | 1.32 |
Forward exchange contracts that exchange USD for CAD maturing in 2020 |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |
Notional amount of derivatives | $ 300 |  | $ 404 |
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 |
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 |
Interest Rate Derivatives | Derivatives in Hedging Relationships | Other current assets |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |
Derivative asset | $ | $ 1 |  |  | $ 2
Interest Rate Derivatives | Derivatives in Hedging Relationships | Other current liabilities |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |
Derivative liability | $ | $ 6 |  |  | $ 1

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