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Risk Management Credit Risks (Details) - Energy Related Derivative - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Credit Derivatives [Line Items] |  |
Letters of Credit Outstanding, Amount | $ 0 |
Initial Margin Requirements | 9 |
Variation Margin Requirements | 25 |
Other Current Liabilities [Member] | Contract and Over the Counter |  |
Credit Derivatives [Line Items] |  |
Derivative, Collateral, Right to Reclaim Cash | $ 16 |
Restricted Deposit [Member] | Contract and Over the Counter |  |
Credit Derivatives [Line Items] |  |
Derivative, Collateral, Right to Reclaim Cash |  | $ 1

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