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Price Risk Management (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  | $ 2 |
Net gain or loss recognized in the statement of income offset by regulatory accounting | $ 12 | 2 | $ 18
Margin Deposit Assets | 6 |  |
Right to reclaim cash collateral |  | 0 |
Credit Risk Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Net Liability Position, Aggregate Fair Value | 148 |  |
Collateral Already Posted, Aggregate Fair Value | 13 |  |
Collateral Aggregate Fair Value | 142 |  |
Right to reclaim cash collateral | $ 1 |  |
Letter of Credit [Member] | Credit Risk Contract [Member] |  |  |
Derivative [Line Items] |  |  |
Collateral posted as letter of credit | 12 million |  |
Electricity [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  | 1 |
Natural Gas [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  | $ 1 |

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