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v3.19.3.a.u2

Price Risk Management (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 31, 2019
Derivative [Line Items] |  |  |  |
Derivative Liability | $ 0 | $ (4) |  | $ (5)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  | 88 |  |
Derivative, Collateral, Right to Reclaim Cash |  | 11 |  |
Net gain or loss recognized in the statement of income offset by regulatory accounting | 2 | 18 | $ 82 |
Derivative, Net Liability Position, Aggregate Fair Value | 122 |  |  |
Collateral Already Posted, Aggregate Fair Value | 15 |  |  |
Collateral Aggregate Fair Value | 114 |  |  |
Margin Deposit Assets | $ 0 |  |  |
Electricity [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  | 84 |  |
Natural Gas [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  | $ 4 |  |

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