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Derivatives and Risk Management Activities - Currency Exchange Rate Risk Hedging (Details) $ in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) $ / $ | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) $ / $ | Sep. 30, 2019 USD ($) | Sep. 30, 2020 CAD ($) $ / $ | 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 | $ (1) | $ (2) | $ 6 |  |
Forward exchange contracts that exchange CAD for USD maturing in 2020 |  |  |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |  |  |
Notional amount of derivatives | $ 153 |  | $ 153 |  | $ 205 |
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) | 1.34 |  | 1.34 |  | 1.34 |
Forward exchange contracts that exchange USD for CAD maturing in 2020 |  |  |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |  |  |
Notional amount of derivatives | $ 88 |  | $ 88 |  | $ 118 |
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) | 1.34 |  | 1.34 |  | 1.34 |
Forward exchange contracts that exchange USD for CAD maturing in 2021 |  |  |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |  |  |
Notional amount of derivatives | $ 21 |  | $ 21 |  | $ 28 |
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) | 1.32 |  | 1.32 |  | 1.32 |
Interest Rate Derivatives | Derivatives in Hedging Relationships | Other current liabilities |  |  |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |  |  |
Derivative liability | $ |  |  |  |  |  | $ 1
Interest Rate Derivatives | Derivatives in Hedging Relationships | Other current liabilities | Maximum |  |  |  |  |  |
Currency Exchange Rate Risk Hedging: |  |  |  |  |  |
Derivative liability | $ | $ 1 |  | $ 1 |  |  |
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 |  |

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