v3.25.1
Document and Entity Information Document
Apr. 30, 2025
Cover [Abstract]  
Document Type 8-K
Document Period End Date Apr. 30, 2025
Entity Registrant Name American Water Works Company, Inc.
Entity File Number 001-34028
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 51-0063696
Entity Address, Address Line One 1 Water Street
Entity Address, City or Town Camden
Entity Address, State or Province NJ
Entity Address, Postal Zip Code 08102-1658
City Area Code 856
Local Phone Number 955-4001
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common stock, par value $0.01 per share
Trading Symbol AWK
Security Exchange Name NYSE
Entity Emerging Growth Company false
Entity Central Index Key 0001410636
Amendment Flag false