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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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- Definition

Revenue Refunded To Customers As A Result Of The TCJA Tax Benefits

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.Fact.4)
-URI https://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319

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