Long-Term Debt Issued (Details) - Other American Water subsidiaries - Private activity bonds and government funded debt - Fixed rate $ in Millions |
9 Months Ended |
|---|---|
|
Sep. 30, 2016
USD ($)
| |
| Debt Instrument [Line Items] | |
| Interest Rate | 1.36% |
| Maturity Date | 2026 |
| Total issuances | $ 2 |