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Income Taxes: Effective Tax Rate Differences From Statutory Tax Rates (Details)		12 Months Ended
	Dec. 21, 2017	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 21, 2017
Income Tax Disclosure [Abstract]
Federal Statutory Rate	35.00%	21.00%	21.00%	21.00%	35.00%
State income tax (net of federal tax effect)		0.50%	1.20%	2.40%
Non-controlling interest		(0.90%)	(1.20%)	(1.20%)
Tax Credits		(7.70%)	(8.40%)	(9.20%)
Flow-through adjustments		(1.40%)	(3.20%)	(1.60%)
Uncertain Tax Benefits		0.00%	0.30%	1.50%
Valuation Allowance		0.00%	0.00%	0.70%
Other tax differences		(0.10%)	(0.20%)	0.60%
Amortization Of excess deferred income tax expense		(2.50%)	(3.10%)	(2.30%)
TCJA bill credits		(0.40%)	(3.60%)	(0.00%)
Effective Income Tax Rate, Continuing Operations		8.50%	2.80%	11.90%

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- Definition

The portion of the difference between the effective income tax rate and domestic federal statutory income tax rate that can be explained by Flow Through Accounting.

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Effective Income Tax Reconciliation, Amortization Of Excess Deferred Income Tax Expense

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Effective Income Tax Reconciliation, TCJA-Related Customer Billing Credits to its Customers, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to noncontrolling interest income (loss) exempt from income taxes.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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