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Fair Value of Financial Assets and Liabilities - Narrative (Details)	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Risk premium (as a percent)	0.60%

X

- Definition

Represents the risk premium rate as an input to measure fair value.

+ References

No definition available.

+ Details

Name:	cwt_FairValueInputsRiskPremium
Namespace Prefix:	cwt_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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