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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT 4 (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Oct. 31, 2015 | Oct. 27, 2015
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |
Balance outstanding at the end of the period | $ 59,000,000 | $ 90,000,000 |  |  |
Short-term borrowing (excluding letters of credit) |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |
Balance outstanding at the end of the period | $ 59,000,000 | $ 90,000,000 |  |  |
Interest Rate at the end of the period (as a percent) | 2.28% | 1.46% |  |  |
Average Amount Outstanding | $ 65,242,000 | $ 59,261,000 |  |  |
Weighted Average Annual Interest Rate (as a percent) | 1.69% | 1.20% |  |  |
Maximum Amount Outstanding | $ 102,500,000 | $ 96,000,000 |  |  |
Syndicated revolving credit facility |  |  |  |  |
Note payable to banks |  |  |  |  |
Variable rate basis | Euro rate |  |  |  |
Syndicated revolving credit facility | Minimum |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |
Interest coverage ratio | 325.00% |  |  |  |
Syndicated revolving credit facility | Maximum |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |
Total funded debt ratio | 65.00% |  |  |  |
Syndicated revolving credit facility | Letter of Credit Irrevocable Franchise Agreement with City of Rancho Cordova [Member] |  |  |  |  |
Note payable to banks |  |  |  |  |
Letter of credit, amount | $ 15,000,000 |  |  |  |
AWR |  |  |  |  |
Note payable to banks |  |  |  |  |
Maximum borrowing capacity | 150,000,000 |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |
Balance outstanding at the end of the period | $ 59,000,000 | 90,000,000 |  |  |
AWR | Syndicated revolving credit facility |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |
Interest coverage ratio | 754.00% |  |  |  |
Total funded debt ratio | 42.00% |  |  |  |
AWR | Syndicated revolving credit facility | Minimum |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |
Interest coverage ratio | 325.00% |  |  |  |
Total funded debt ratio | 65.00% |  |  |  |
AWR | Syndicated revolving credit facility | Maximum |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |
Total funded debt ratio | 100.00% |  |  |  |
AWR | Syndicated revolving credit facility | Letters of credit |  |  |  |  |
Note payable to banks |  |  |  |  |
Maximum borrowing capacity | $ 25,000,000 |  |  |  |
Letter of credit, amount | $ 6,300,000 |  |  |  |
Letter of credit fee (as a percent) | 0.65% |  |  |  |
AWR | Syndicated revolving credit facility | Letter of Credit - GSWC business automobile insurance policy |  |  |  |  |
Note payable to banks |  |  |  |  |
Letter of credit, amount | $ 340,000 |  |  |  |
AWR | Syndicated revolving credit facility | Letter of Credit - American Recovery and Reinvestment Act |  |  |  |  |
Note payable to banks |  |  |  |  |
Letter of credit, amount | 5,400,000 |  |  |  |
AWR | Syndicated revolving credit facility | Letter of Credit - Purchase of power |  |  |  |  |
Note payable to banks |  |  |  |  |
Letter of credit, amount | 585,000,000 |  |  |  |
Subsidiaries [Member] |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |
Dividends paid | (36,500,000) | (33,800,000) | $ (62,000,000) |  |
GSWC |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |
Dividends paid | (27,680,000) | (25,450,000) | $ (62,000,000) |  |
Syndicated revolving credit facility | Syndicated revolving credit facility |  |  |  |  |
Note payable to banks |  |  |  |  |
Maximum borrowing capacity | 150,000,000 |  |  |  |
Syndicated revolving credit facility | AWR | Syndicated revolving credit facility |  |  |  |  |
Note payable to banks |  |  |  |  |
Maximum borrowing capacity | 150,000,000 |  |  |  |
Notes Payable, Other Payables [Member] | GSWC |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 40,000,000 | $ 40,000,000
Debt Instrument, Maximum Borrowing Capacity |  |  |  | 40,000,000 | 40,000,000
Notes Payable, Other Payables [Member] | American States Utility Services [Member] |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | 10,000,000 | 10,000,000
Debt Instrument, Maximum Borrowing Capacity |  |  |  | $ 10,000,000 | $ 10,000,000
Notes Receivable | Notes Payable, Other Payables [Member] | GSWC |  |  |  |  |
Short-term borrowing activities (excluding letters of credit) |  |  |  |  |
Notes Receivable, Related Parties, Current | $ 0 | $ 0 |  |  |

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