Basis of Presentation	3 Months Ended
Mar. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Note 1: Basis of Presentation The unaudited Consolidated Financial Statements included in this report include the accounts of American Water Works Company, Inc. and all of its subsidiaries (the “Company” or “American Water”), in which a controlling interest is maintained after the elimination of intercompany balances and transactions. The financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial reporting, and the rules and regulations for reporting on Quarterly Reports on Form 10-Q (“Form 10-Q”). Accordingly, they do not contain certain information and disclosures required by GAAP for comprehensive financial statements. In the opinion of management, all adjustments necessary for a fair statement of the financial position as of March 31, 2025, and the results of operations and cash flows for all periods presented, have been made. All adjustments are of a normal, recurring nature, except as otherwise disclosed. The unaudited Consolidated Financial Statements and Notes included in this report should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 (“Form 10-K”), which provides a more complete discussion of the Company’s accounting policies, financial position, operating results and other matters. The results of operations for interim periods are not necessarily indicative of the results that may be expected for the year, primarily due to the seasonality of the Company’s operations.

Basis of Presentation

3 Months Ended

Mar. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Note 1: Basis of Presentation

The unaudited Consolidated Financial Statements included in this report include the accounts of American Water Works Company, Inc. and all of its subsidiaries (the “Company” or “American Water”), in which a controlling interest is maintained after the elimination of intercompany balances and transactions. The financial statements have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial reporting, and the rules and regulations for reporting on Quarterly Reports on Form 10-Q (“Form 10-Q”). Accordingly, they do not contain certain information and disclosures required by GAAP for comprehensive financial statements. In the opinion of management, all adjustments necessary for a fair statement of the financial position as of March 31, 2025, and the results of operations and cash flows for all periods presented, have been made. All adjustments are of a normal, recurring nature, except as otherwise disclosed.

The unaudited Consolidated Financial Statements and Notes included in this report should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 (“Form 10-K”), which provides a more complete discussion of the Company’s accounting policies, financial position, operating results and other matters. The results of operations for interim periods are not necessarily indicative of the results that may be expected for the year, primarily due to the seasonality of the Company’s operations.