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Segment Information	12 Months Ended
Segment Information	Dec. 31, 2018
Segment Reporting [Abstract]
Segment Information	Segment Information Puget Energy and PSE operate one reportable segment referred to as the regulated utility segment. Puget Energy’s regulated utility operation generates, purchases and sells electricity and purchases, transports and sells natural gas. The service territory of PSE covers approximately 6,000 square miles in the state of Washington.