Regulatory Matters - PacifiCorp - Regulatory Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Regulatory Assets [Line Items]
Regulatory assets		$ 150	$ 130
Regulatory assets, noncurrent		4,307	4,155
Total regulatory assets		4,457	4,285
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		2,800	2,300
Deferred Income Tax Charge [Member]
Regulatory Assets [Line Items]
Total regulatory assets	[1]	$ 1,754	1,577
Regulatory asset amortization period years	[1]	27 years
Employee benefit plans [Member]
Regulatory Assets [Line Items]
Total regulatory assets	[2]	$ 816	778
Regulatory asset amortization period years	[2]	17 years
Unamortized contract values [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 98	110
Regulatory asset amortization period years		7 years
Deferred net power costs [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 38	140
Regulatory asset amortization period years		1 year
Unrealized loss on regulated derivative contracts [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 154	250
Regulatory asset amortization period years		5 years
Asset Retirement Obligation Costs [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 301	281
Regulatory asset amortization period years		12 years
PacifiCorp [Member]
Regulatory Assets [Line Items]
Regulatory assets		$ 53	102
Regulatory assets, noncurrent		1,490	1,583
Total regulatory assets		1,543	1,685
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided		1,019	1,102
PacifiCorp [Member] | Deferred Income Tax Charge [Member]
Regulatory Assets [Line Items]
Total regulatory assets	[3]	$ 421	437
Regulatory asset amortization period years	[3]	26 years
PacifiCorp [Member] | Employee benefit plans [Member]
Regulatory Assets [Line Items]
Total regulatory assets	[4]	$ 525	499
Regulatory asset amortization period years	[4]	21 years
PacifiCorp [Member] | Utah mine disposition [Member]
Regulatory Assets [Line Items]
Total regulatory assets	[5]	$ 166	186
Regulatory asset amortization period years	[5]	Various
PacifiCorp [Member] | Unamortized contract values [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 98	110
Regulatory asset amortization period years		7 years
PacifiCorp [Member] | Deferred net power costs [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 33	86
Regulatory asset amortization period years		1 year
PacifiCorp [Member] | Unrealized loss on regulated derivative contracts [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 73	133
Regulatory asset amortization period years		5 years
PacifiCorp [Member] | Asset Retirement Obligation Costs [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 82	65
Regulatory asset amortization period years		20 years
PacifiCorp [Member] | Other Regulatory Assets (Liabilities) [Member]
Regulatory Assets [Line Items]
Total regulatory assets		$ 145	$ 169
Regulatory asset amortization period years		Various

[1] Amounts primarily represent income tax benefits related to state accelerated tax depreciation and certain property-related basis differences that were previously flowed through to customers and will be included in regulated rates when the temporary differences reverse.

[2] Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in regulated rates when recognized.

[3] (1)Amounts primarily represent income tax benefits and expense related to certain property-related basis differences and other various items that PacifiCorp is required to pass on to its customers.

[4] (2)Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in rates when recognized.

[5] (3)Amounts represent regulatory assets established as a result of the Utah mine disposition discussed below for the net property, plant and equipment not considered probable of disallowance and for the portion of losses associated with the assets held for sale, UMWA 1974 Pension Plan withdrawal and closure costs incurred to date considered probable of recovery.