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Derivatives and Risk Management Activities - Offsetting (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative Asset Positions |  |
Effect of Collateral Netting (Asset) |  | $ (45)
Derivative Liability Positions |  |
Effect of Collateral Netting (Liability) | $ 318 |
Commodity Derivatives |  |
Derivative Asset Positions |  |
Effect of Collateral Netting (Asset) |  | (45)
Derivative Liability Positions |  |
Gross Position - Asset | 85 | 235
Gross Position - Liability | (386) | (105)
Effect of Collateral Netting (Liability) | 318 |
Net Carrying Value Presented on the Balance Sheet, Total | 17 | 85
Other current assets | Commodity Derivatives |  |
Derivative Asset Positions |  |
Gross Position - Asset | 71 | 179
Gross Position - Liability | (314) | (37)
Effect of Collateral Netting (Asset) |  | (45)
Net Carrying Value Presented on the Balance Sheet | 75 | 97
Derivative Liability Positions |  |
Effect of Collateral Netting (Liability) | 318 |
Other long-term assets, net | Commodity Derivatives |  |
Derivative Asset Positions |  |
Gross Position - Asset | 5 | 24
Gross Position - Liability | 0 | 0
Net Carrying Value Presented on the Balance Sheet | 5 | 24
Other current liabilities | Commodity Derivatives |  |
Derivative Liability Positions |  |
Gross Position - Asset | 9 | 32
Gross Position - Liability | (40) | (56)
Net Carrying Value Presentation on the Balance Sheet | (31) | (24)
Other long-term liabilities and deferred credits | Commodity Derivatives |  |
Derivative Liability Positions |  |
Gross Position - Asset | 0 | 0
Gross Position - Liability | (32) | (12)
Net Carrying Value Presentation on the Balance Sheet | $ (32) | $ (12)

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