Employee Benefit Plans (Schedule Of Information Regarding Individually Significant Pension Plans) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Alaska Electrical Pension Plan [Member]
Multiemployer Plans [Line Items]
Employer Identification Number	[1]	926005171
Plan Number	[1]	001
Year-end Date	[1]	December 31
Expiration Date of CBA's	[1]	Jun. 30, 2017
Subject to Funding Improvement Plan	[1]	No
Surcharge Paid	[1]	NA
Zone Status	[1]	Green
Required minimum contributions	[1]	None
Contributions (in millions)	[1]	$ 3.2	$ 3.1	$ 3.3
Contributions > 5% of total plan contributions	[1]	Yes
NRECA Retirement Security Plan [Member]
Multiemployer Plans [Line Items]
Employer Identification Number	[1]	530116145
Plan Number	[1]	333
Year-end Date	[1]	December 31
Subject to Funding Improvement Plan	[1],[2]	No
Surcharge Paid	[1],[2]	NA
Zone Status	[1],[3]	NA
Required minimum contributions	[1]	N/A
Contributions (in millions)	[1]	$ 3.5	$ 3.5	$ 3.5
Contributions > 5% of total plan contributions	[1]	No

[1] The Alaska Electrical Pension Plan financial statements are publicly available. The NRECA RS Plan financial statements are available on Chugach's website at www.chugachelectric.com.

[2] The provisions of the PPA do not apply to the RS Plan, therefore, funding improvement plans and surcharges are not applicable. Future contribution requirements are determined each year as part of the actuarial valuation of the RS Plan and may change as a result of plan experience.

[3] A "zone status" determination is not required, and therefore not determined under the Pension Protection Act (PPA) of 2006.