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Income Taxes: Tax Cut and Jobs Act (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 21, 2017 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 21, 2017
U.S. federal corporate tax rate | 35.00% | 21.00% | 21.00% | 21.00% | 35.00%
Revenue Subject to Refund |  |  |  |  |
Revenue Refunded To Customers As A Result Of The TCJA Tax Benefits |  | $ 11 | $ 23 | $ 13 |

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