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Organization and Operation	12 Months Ended
Organization and Operation	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Operation	Note 1: Organization and Operation American Water Works Company, Inc. (the “Company” or “American Water”) is a holding company for regulated and market-based subsidiaries that provide water and wastewater services throughout the United States. References to “parent company” mean American Water Works Company, Inc., without its subsidiaries. The Company’s primary business involves the ownership of regulated utilities that provide water and wastewater services in 14 states in the United States, collectively referred to as the “Regulated Businesses.” The Company also operates other businesses that provide water and wastewater services within non-reportable operating segments, collectively referred to as the “Market-Based Businesses.” The Company’s primary Market-Based Businesses include the Military Services Group (“MSG”), which enters into long-term contracts with the U.S. government to provide water and wastewater services on various military installations; and the former Homeowner Services Group (“HOS”), which provided various warranty protection programs and other home services to residential customers.