Income Taxes (Net Operating Loss Carryforwards) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Federal
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards:		$ 45
State
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards:	$ 624	$ 698

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-3

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant