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Risk Management - Credit Risks (Details) - Energy commodity derivative contracts - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Credit Derivatives [Line Items] |  |
Letter of credits outstanding, amount | $ 0 | $ 0
Initial Margin Requirements | 15 |
Variation Margin Requirements | 7 |
Other current liabilities | Cash collateral held |  |
Credit Derivatives [Line Items] |  |
Collateral posted(b) | $ 8 | $ 15

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