Income Taxes And Tax-Related Items Tax Years for Significant Jurisdictions That Remain Subject to Examination (Details)	12 Months Ended
Dec. 31, 2020
Federal \| Minimum
Open Tax Year	2017
Federal \| Maximum
Open Tax Year	2019
California \| Minimum
Open Tax Year	2006
Open tax years - second grouping	2014
California \| Maximum
Open Tax Year	2007
Open tax years - second grouping	2019

Tax year that remains open to examination under enacted tax laws, in CCYY format.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

Name:	us-gaap_OpenTaxYear
Namespace Prefix:	us-gaap_
Data Type:	us-types:gYearListItemType
Balance Type:	na
Period Type:	duration