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Regulatory Matters (Details 7) - GSWC - CPUC Subpoena - Audit
 1 Months Ended
Dec. 31, 2014
Dec. 31, 2011
Regulatory matters:    
Number of separate independent audits of procurement practices agreed as a part of the settlement agreement   3
Period of separate independent audits of procurement practices agreed as a part of settlement agreement   10 years
Period of Separate Independent Audits of Procurement Practices Covered by Report 20 years