Regulatory Matters - PacifiCorp - Regulatory Liabilities (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Regulatory Liabilities [Line Items]
Regulatory liabilities		$ 187	$ 402
Regulatory liabilities, noncurrent		2,933	2,631
Regulatory Liabilities		3,120	3,033
Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities	[1]	$ 2,242	2,167
Regulatory liability amortization period years	[1]	27 years
PacifiCorp [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities		$ 54	34
Regulatory liabilities, noncurrent		978	938
Regulatory Liabilities		1,032	972
PacifiCorp [Member] | Removal Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities, noncurrent		917	894
Regulatory Liabilities	[2]	$ 917	894
Regulatory liability amortization period years	[2]	26 years
PacifiCorp [Member] | Deferred Income Tax Charge [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities		$ 9	12
Regulatory liability amortization period years		Various
PacifiCorp [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Liabilities [Line Items]
Regulatory Liabilities		$ 106	$ 66
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.