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Income Taxes: Winter Storm Uri (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Recovery of incremental costs	$ 652,981	$ 796,599
Deferred income tax liabilities, net	508,941	465,388
Internal Revenue Service (IRS)
Operating Loss Carryforwards, With no Expiration Date	584,161
Operating Loss Carryforwards	330,085
State and Local Jurisdiction
Operating Loss Carryforwards	408,269
Winter Storm Uri
Recovery of incremental costs	546,000
Deferred income tax liabilities, net	$ 85,000	124,000
Winter Storm Uri | Internal Revenue Service (IRS)
Operating Loss Carryforwards, With no Expiration Date		509,000
Winter Storm Uri | State and Local Jurisdiction
Operating Loss Carryforwards		$ 375,000

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