Rendering

Component: (Network and Table)
Network
100550 - Disclosure - Schedule of Allowances for Uncollectible Accounts (Details)
(http://www.amwater.com/20161231/taxonomy/role/DisclosureScheduleOfAllowancesForUncollectibleAccountsDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001410636 (http://www.sec.gov/CIK)
Accounts Notes Loans And Financing Receivable Gross Allowance And Net [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Accounts Notes Loans And Financing Receivable Gross Allowance And Net [Abstract]
 
 
 
Balance as of January 1
(39,000,000) 
(35,000,000) 
(34,000,000) 
Amounts charged to expense
(27,000,000) 
(32,000,000) 
(37,000,000) 
Amounts written off
29,000,000  
31,000,000  
38,000,000  
Recoveries of amounts written off
(3,000,000) 
(3,000,000) 
(2,000,000) 
Balance as of December 31
(40,000,000) 
 
(39,000,000) 
 
(35,000,000)