XML 75 R53.htm IDEA: XBRL DOCUMENT v3.25.4

Organization and Operation (Details)	Dec. 31, 2025 state
Regulated Businesses
Segment Reporting Information [Line Items]
Number of states in which entity provides water and wastewater services	14

X

- Definition

Number Of States In Which Entity Provides Water And Wastewater Services

+ References

No definition available.

+ Details

Name:	awk_NumberOfStatesInWhichEntityProvidesWaterAndWastewaterServices
Namespace Prefix:	awk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=awk_RegulatedBusinessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: