Regulatory Matters - PacifiCorp - Regulatory Liabilities (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Regulatory Liabilities [Line Items]
Regulatory liabilities		$ 402	$ 163
Regulatory liabilities, noncurrent		2,631	2,669
Regulatory Liabilities		3,033	2,832
Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	[1]	$ 2,167	2,215
Regulatory liability amortization period years	[1]	28 years
PacifiCorp [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities		$ 34	34
Regulatory liabilities, noncurrent		938	910
Regulatory Liabilities		972	944
PacifiCorp [Member] | Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities, noncurrent		894	873
Regulatory Liabilities	[2]	$ 894	873
Regulatory liability amortization period years	[2]	26 years
PacifiCorp [Member] | Deferred Income Tax Charge [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities		$ 12	13
Regulatory liability amortization period years		Various
PacifiCorp [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities		$ 66	$ 58
Regulatory liability amortization period years		Various

[1] Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing regulated property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.

[2] (1)Amounts represent estimated costs, as accrued through depreciation rates and exclusive of ARO liabilities, of removing property, plant and equipment in accordance with accepted regulatory practices. Amounts are deducted from rate base or otherwise accrue a carrying cost.