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New Accounting Standards (Details) - USD ($) $ in Millions | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for credit loss |  | $ 33 | $ 24 | $ 20
Retained earnings |  | $ (25) | $ (271) |
EnerBank | Forecast | Accounting Standards Update 2016-13 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Allowance for credit loss | $ 65 |  |  |
Retained earnings | $ 0 |  |  |

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