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Summary of Significant Accounting Policies - Narrative (Details)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Maximum collection period	24 months

X

- Definition

Represents the maximum collection period in which deferred net WRAM and MCBA revenues and associated costs will be recognized.

+ References

No definition available.

+ Details

Name:	cwt_MaximumCollectionPeriodInWhichDeferredNetWRAMAndMCBARevenuesAndAssociatedCostsWillBeRecognized
Namespace Prefix:	cwt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration