Regulatory Matters (Details 7) (GSWC, CPUC Subpoena)	1 Months Ended
	Dec. 31, 2014	Dec. 31, 2011 Audit
GSWC | CPUC Subpoena
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