PacifiCorp (PPWLO) 10-K 2 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 31, 2014	Jan. 31, 2015	Jun. 30, 2014
Entity Information [Line Items]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Entity Registrant Name	PACIFICORP /OR/
Entity Central Index Key	75594
Current Fiscal Year End Date	-19
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		357,060,915
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$0

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Current assets:
Cash and cash equivalents	$23	$53
Accounts receivable, net	701	700
Income taxes receivable	133	0
Inventories:
Materials and supplies	218	213
Fuel	199	241
Deferred income taxes	28	66
Regulatory assets	131	94
Other current assets	92	75
Total current assets	1,525	1,442
Property, plant and equipment, net	18,719	18,507
Regulatory assets	1,574	1,290
Other assets	449	420
Total assets	22,267	21,659
Current liabilities:
Accounts payable	465	504
Income taxes payable	0	22
Accrued employee expenses	76	79
Accrued interest	110	110
Accrued property and other taxes	59	58
Short-term debt	20	0
Current portion of long-term debt and capital lease obligations	134	238
Regulatory liabilities	34	55
Other current liabilities	222	208
Total current liabilities	1,120	1,274
Regulatory liabilities	910	879
Long-term debt and capital lease obligations	6,919	6,639
Deferred income taxes	4,609	4,359
Other long-term liabilities	953	721
Total liabilities	14,511	13,872
Commitments and contingencies (Note 13)
Shareholders' equity:
Preferred stock	2	2
Common stock - 750 shares authorized, no par value, 357 shares issued and outstanding	0	0
Additional paid-in capital	4,479	4,479
Retained earnings	3,288	3,315
Accumulated other comprehensive loss, net	-13	-9
Total shareholders' equity	7,756	7,787
Total liabilities and shareholders' equity	$22,267	$21,659

Consolidated_Balance_Sheets_Co

Consolidated Balance Sheets Consolidated Balance Sheets Parentheticals (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Shareholders' equity:
Common Stock, Par Value	$0	$0
Common Stock, Shares Authorized	750	750
Common Stock, Shares, Issued	357	357
Common Stock, Shares, Outstanding	357	357

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating revenue	$5,252	$5,147	$4,882
Operating costs and expenses:
Energy costs	1,997	1,924	1,818
Operations and maintenance	1,057	1,114	1,242
Depreciation and amortization	726	675	640
Taxes, other than income taxes	172	170	161
Total operating costs and expenses	3,952	3,883	3,861
Operating income	1,300	1,264	1,021
Other income (expense):
Interest expense	-379	-379	-380
Allowance for borrowed funds	25	29	29
Allowance for equity funds	51	57	58
Other, net	10	8	6
Total other income (expense)	-293	-285	-287
Income before income tax expense	1,007	979	734
Income tax expense	309	297	197
Net income	$698	$682	$537

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$698	$682	$537
Other comprehensive (loss) income, net of tax -
Unrecognized amounts on retirement benefits, net of tax of $(3), $1 and $(2)	-4	3	-3
Comprehensive income	$694	$685	$534

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income Consolidated Statements of Comprehensive Income - Parentheticals (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Unrecognized amounts on retirement benefits, tax	($3)	$1	($2)

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Shareholders' Equity (USD $)	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss, Net [Member]
In Millions, unless otherwise specified
Balance at Dec. 31, 2011	$7,312	$41	$0	$4,479	$2,801	($9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	537				537
Other comprehensive income (loss)	-3					-3
Preferred stock dividends declared	-2				-2
Common stock dividends declared	-200				-200
Balance at Dec. 31, 2012	7,644	41	0	4,479	3,136	-12
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	682				682
Other comprehensive income (loss)	3					3
Preferred stock dividends declared	-2				-2
Common stock dividends declared	-500				-500
Redemption of preferred stock	-40	-39			-1
Balance at Dec. 31, 2013	7,787	2	0	4,479	3,315	-9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	698				698
Other comprehensive income (loss)	-4					-4
Common stock dividends declared	-725				-725
Balance at Dec. 31, 2014	$7,756	$2	$0	$4,479	$3,288	($13)

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$698	$682	$537
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	726	675	640
Allowance for equity funds	-51	-57	-58
Deferred income taxes and amortization of investment tax credits	297	230	312
Changes in regulatory assets and liabilities	-112	-32	1
Other, net	22	21	26
Changes in other operating assets and liabilities:
Accounts receivable and other assets	5	-7	-17
Derivative collateral, net	-16	43	68
Inventories	37	14	-35
Income taxes, net	-155	-26	118
Accounts payable and other liabilities	119	10	35
Net cash flows from operating activities	1,570	1,553	1,627
Cash flows from investing activities:
Capital expenditures	-1,066	-1,065	-1,346
Other, net	-13	16	4
Net cash flows from investing activities	-1,079	-1,049	-1,342
Cash flows from financing activities:
Proceeds from long-term debt	425	299	749
Repayments of long-term debt and capital lease obligations	-238	-284	-102
Net proceeds from (repayments of) short-term debt	20	0	-688
Redemption of preferred stock	0	-40	0
Common stock dividends	-725	-500	-200
Preferred stock dividends	0	-2	-2
Other, net	-3	-4	-9
Net cash flows from financing activities	-521	-531	-252
Net change in cash and cash equivalents	-30	-27	33
Cash and cash equivalents at beginning of period	53	80	47
Cash and cash equivalents at end of period	$23	$53	$80

Organization_and_Operations

Organization and Operations	12 Months Ended
	Dec. 31, 2014
Organization and Operations [Abstract]
Nature of Operations [Text Block]	(1)    Organization and Operations
	PacifiCorp, which includes PacifiCorp and its subsidiaries, is a United States regulated electric utility company serving retail customers, including residential, commercial, industrial, irrigation and other customers in portions of the states of Utah, Oregon, Wyoming, Washington, Idaho and California. PacifiCorp owns, or has interests in, a number of thermal, hydroelectric, wind-powered and geothermal generating facilities, as well as electric transmission and distribution assets. PacifiCorp also buys and sells electricity on the wholesale market with other utilities, energy marketing companies, financial institutions and other market participants. PacifiCorp is subject to comprehensive state and federal regulation. PacifiCorp's subsidiaries support its electric utility operations by providing coal mining services. PacifiCorp is an indirect subsidiary of Berkshire Hathaway Energy Company ("BHE"), a holding company based in Des Moines, Iowa that owns subsidiaries principally engaged in energy businesses. BHE is a consolidated subsidiary of Berkshire Hathaway Inc. ("Berkshire Hathaway").

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Significant Accounting Policies [Text Block]	(2)    Summary of Significant Accounting Policies
	Basis of Consolidation and Presentation
	The Consolidated Financial Statements include the accounts of PacifiCorp and its subsidiaries in which it holds a controlling financial interest as of the financial statement date. Intercompany accounts and transactions have been eliminated.
	Use of Estimates in Preparation of Financial Statements
	The preparation of the Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the period. These estimates include, but are not limited to, the effects of regulation; certain assumptions made in accounting for pension and other postretirement benefits; asset retirement obligations ("AROs"); income taxes; unbilled revenue; valuation of certain financial assets and liabilities, including derivative contracts; and accounting for contingencies. Actual results may differ from the estimates used in preparing the Consolidated Financial Statements.
	Accounting for the Effects of Certain Types of Regulation
	PacifiCorp prepares its financial statements in accordance with authoritative guidance for regulated operations, which recognizes the economic effects of regulation. Accordingly, PacifiCorp defers the recognition of certain costs or income if it is probable that, through the ratemaking process, there will be a corresponding increase or decrease in future rates. Regulatory assets and liabilities are established to reflect the impacts of these deferrals, which will be recognized in earnings in the periods the corresponding changes in rates occur.
	PacifiCorp continually evaluates the applicability of the guidance for regulated operations and whether its regulatory assets and liabilities are probable of inclusion in future rates by considering factors such as a change in the regulator's approach to setting rates from cost-based ratemaking to another form of regulation, other regulatory actions or the impact of competition that could limit PacifiCorp's ability to recover its costs. PacifiCorp believes the application of the guidance for regulated operations is appropriate and its existing regulatory assets and liabilities are probable of inclusion in future rates. The evaluation reflects the current political and regulatory climate at both the federal and state levels. If it becomes no longer probable that the deferred costs or income will be included in future rates, the related regulatory assets and liabilities will be written off to net income or re-established as accumulated other comprehensive income (loss) ("AOCI").
	Fair Value Measurements
	As defined under GAAP, fair value is the price that would be received to sell an asset or paid to transfer a liability between market participants in the principal market or in the most advantageous market when no principal market exists. Adjustments to transaction prices or quoted market prices may be required in illiquid or disorderly markets in order to estimate fair value. Different valuation techniques may be appropriate under the circumstances to determine the value that would be received to sell an asset or paid to transfer a liability in an orderly transaction. Market participants are assumed to be independent, knowledgeable, able and willing to transact an exchange and not under duress. Nonperformance or credit risk is considered in determining fair value. Considerable judgment may be required in interpreting market data used to develop the estimates of fair value. Accordingly, estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized in a current or future market exchange.
	Cash Equivalents and Restricted Cash and Investments
	Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted amounts are included in other current assets and other assets on the Consolidated Balance Sheets.
	Investments
	Available-for-sale securities are carried at fair value with realized gains and losses, as determined on a specific identification basis, recognized in earnings and unrealized gains and losses recognized in AOCI, net of tax. As of December 31, 2014 and 2013, PacifiCorp had no unrealized gains and losses on available-for-sale securities.
	PacifiCorp utilizes the equity method of accounting with respect to investments when it possesses the ability to exercise significant influence, but not control, over the operating and financial policies of the investee. The ability to exercise significant influence is presumed when an investor possesses more than 20% of the voting interests of the investee. This presumption may be overcome based on specific facts and circumstances that demonstrate the ability to exercise significant influence is restricted. In applying the equity method, PacifiCorp records the investment at cost and subsequently increases or decreases the carrying value of the investment by PacifiCorp's proportionate share of the net earnings or losses and other comprehensive income (loss) ("OCI") of the investee. PacifiCorp records dividends or other equity distributions as reductions in the carrying value of the investment.
	Allowance for Doubtful Accounts
	Accounts receivable are stated at the outstanding principal amount, net of an estimated allowance for doubtful accounts. The allowance for doubtful accounts is based on PacifiCorp's assessment of the collectibility of amounts owed to PacifiCorp by its customers. This assessment requires judgment regarding the ability of customers to pay or the outcome of any pending disputes. The change in the balance of the allowance for doubtful accounts, which is included in accounts receivable, net on the Consolidated Balance Sheets, is summarized as follows for the years ended December 31 (in millions):
		2014			2013			2012
	Beginning balance	$	8		$	9		$	9
	Charged to operating costs and expenses, net	11			13			14
	Write-offs, net	(12		)	(14		)	(14		)
	Ending balance	$	7		$	8		$	9
	Derivatives
	PacifiCorp employs a number of different derivative contracts, which may include forwards, options, swaps and other agreements, to manage price risk for electricity, natural gas and other commodities and interest rate risk. Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. Derivative balances reflect offsetting permitted under master netting agreements with counterparties and cash collateral paid or received under such agreements.
	Commodity derivatives used in normal business operations that are settled by physical delivery, among other criteria, are eligible for and may be designated as normal purchases or normal sales. Normal purchases or normal sales contracts are not marked-to-market and settled amounts are recognized as operating revenue or energy costs on the Consolidated Statements of Operations.
	For PacifiCorp's derivative contracts, the settled amount is generally included in rates. Accordingly, the net unrealized gains and losses associated with interim price movements on contracts that are accounted for as derivatives and probable of inclusion in rates are recorded as regulatory assets. For a derivative contract not probable of inclusion in rates, changes in the fair value are recognized in earnings.
	Inventories
	Inventories consist of materials and supplies, coal stocks, natural gas and fuel oil, which are stated at the lower of average cost or market.
	Property, Plant and Equipment, Net
	General
	Additions to property, plant and equipment are recorded at cost. PacifiCorp capitalizes all construction-related material, direct labor and contract services, as well as indirect construction costs, which include debt and equity allowance for funds used during construction ("AFUDC"). The cost of additions and betterments are capitalized, while costs incurred that do not improve or extend the useful lives of the related assets are generally expensed.
	Depreciation and amortization are generally computed on the straight-line method based on composite asset class lives prescribed by PacifiCorp's various regulatory authorities or over the assets' estimated useful lives. Depreciation studies are completed periodically to determine the appropriate composite asset class lives, net salvage and depreciation rates. These studies are reviewed and rates are ultimately approved by the various regulatory authorities. Net salvage includes the estimated future residual values of the assets and any estimated removal costs recovered through approved depreciation rates. Estimated removal costs are recorded as either a cost of removal regulatory liability or an ARO liability on the Consolidated Balance Sheets, depending on whether the obligation meets the requirements of an ARO. As actual removal costs are incurred, the associated liability is reduced.
	Generally when PacifiCorp retires or sells a component of regulated property, plant and equipment, it charges the original cost, net of any proceeds from the disposition, to accumulated depreciation. Any gain or loss on disposals of all other assets is recorded through earnings.
	Debt and equity AFUDC, which represent the estimated costs of debt and equity funds necessary to finance the construction of property, plant and equipment, is capitalized as a component of property, plant and equipment, with offsetting credits to the Consolidated Statements of Operations. AFUDC is computed based on guidelines set forth by the Federal Energy Regulatory Commission ("FERC"). After construction is completed, PacifiCorp is permitted to earn a return on these costs as a component of the related assets, as well as recover these costs through depreciation expense over the useful lives of the related assets.
	Asset Retirement Obligations
	PacifiCorp recognizes AROs when it has a legal obligation to perform decommissioning, reclamation or removal activities upon retirement of an asset. PacifiCorp's AROs are primarily associated with its generating facilities. The fair value of an ARO liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made, and is added to the carrying amount of the associated asset, which is then depreciated over the remaining useful life of the asset. Subsequent to the initial recognition, the ARO liability is adjusted for any revisions to the original estimate of undiscounted cash flows (with corresponding adjustments to property, plant and equipment, net) and for accretion of the ARO liability due to the passage of time. The difference between the ARO liability, the corresponding ARO asset included in property, plant and equipment, net and amounts recovered in rates to satisfy such liabilities is recorded as a regulatory asset or liability.
	Revenue Recognition
	Revenue is recognized as electricity is delivered or services are provided. Revenue recognized includes billed and unbilled amounts. As of December 31, 2014 and 2013, unbilled revenue was $243 million and $258 million, respectively, and is included in accounts receivable, net on the Consolidated Balance Sheets. Rates charged are established by regulators or contractual arrangements.
	The determination of sales to individual customers is based on the reading of the customer's meter, which is performed on a systematic basis throughout the month. At the end of each month, energy provided to customers since the date of the last meter reading is estimated, and the corresponding unbilled revenue is recorded. The estimate is reversed in the following month and actual revenue is recorded based on subsequent meter readings.
	The monthly unbilled revenues of PacifiCorp are determined by the estimation of unbilled energy provided during the period, the assignment of unbilled energy provided to customer classes and the average rate per customer class. Factors that can impact the estimate of unbilled energy include, but are not limited to, seasonal weather patterns, total volumes supplied to the system, line losses, economic impacts and composition of sales among customer classes.
	PacifiCorp records sales, franchise and excise taxes collected directly from customers and remitted directly to the taxing authorities on a net basis on the Consolidated Statements of Operations.
	Income Taxes
	Berkshire Hathaway includes PacifiCorp in its United States federal income tax return. Consistent with established regulatory practice, PacifiCorp's provision for income taxes has been computed on a stand-alone basis.
	Deferred income tax assets and liabilities are based on differences between the financial statement and income tax basis of assets and liabilities using estimated income tax rates expected to be in effect for the year in which the differences are expected to reverse. Changes in deferred income tax assets and liabilities that are associated with components of OCI are charged or credited directly to OCI. Changes in deferred income tax assets and liabilities that are associated with income tax benefits and expense for certain property-related basis differences and other various differences that PacifiCorp is required to pass on to its customers are charged or credited directly to a regulatory asset or liability. These amounts were recognized as regulatory assets of $446 million and $461 million as of December 31, 2014 and 2013, respectively, and regulatory liabilities of $13 million and $21 million as of December 31, 2014 and 2013, respectively, and will be included in rates when the temporary differences reverse. Other changes in deferred income tax assets and liabilities are included as a component of income tax expense. Changes in deferred income tax assets and liabilities attributable to changes in enacted income tax rates are charged or credited to income tax expense or a regulatory asset or liability in the period of enactment. Valuation allowances are established when necessary to reduce deferred income tax assets to the amount that is more likely than not to be realized.
	Investment tax credits are generally deferred and amortized over the estimated useful lives of the related properties or as prescribed by various regulatory jurisdictions. Investment tax credits are included in other long-term liabilities on the Consolidated Balance Sheets and were $27 million and $32 million as of December 31, 2014 and 2013, respectively.
	In determining PacifiCorp's income taxes, management is required to interpret complex income tax laws and regulations, which includes consideration of regulatory implications imposed by PacifiCorp's various regulatory jurisdictions. PacifiCorp's income tax returns are subject to continuous examinations by federal, state and local income tax authorities that may give rise to different interpretations of these complex laws and regulations. Due to the nature of the examination process, it generally takes years before these examinations are completed and these matters are resolved. PacifiCorp recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the Consolidated Financial Statements from such a position are measured based on the largest benefit that is more likely than not to be realized upon ultimate settlement. Although the ultimate resolution of PacifiCorp's federal, state and local income tax examinations is uncertain, PacifiCorp believes it has made adequate provisions for these income tax positions. The aggregate amount of any additional income tax liabilities that may result from these examinations, if any, is not expected to have a material impact on PacifiCorp's consolidated financial results. PacifiCorp's unrecognized tax benefits are primarily included in other long-term liabilities on the Consolidated Balance Sheets. Estimated interest and penalties, if any, related to uncertain tax positions are included as a component of income tax expense on the Consolidated Statements of Operations.
	Segment Information
	PacifiCorp currently has one segment, which includes its regulated electric utility operations.
	New Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, which creates FASB Accounting Standards Codification ("ASC") Topic 606, "Revenue from Contracts with Customers" and supersedes ASC Topic 605, "Revenue Recognition." The guidance replaces industry-specific guidance and establishes a single five-step model to identify and recognize revenue. The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Additionally, the guidance requires the entity to disclose further quantitative and qualitative information regarding the nature and amount of revenues arising from contracts with customers, as well as other information about the significant judgments and estimates used in recognizing revenues from contracts with customers. This guidance is effective for interim and annual reporting periods beginning after December 15, 2016. Early application is not permitted. This guidance may be adopted retrospectively or under a modified retrospective method where the cumulative effect is recognized at the date of initial application. PacifiCorp is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements.
	In February 2013, the FASB issued ASU No. 2013-04, which amends FASB ASC Topic 405, "Liabilities." The amendments in this guidance require an entity to measure obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date as the amount the reporting entity agreed to pay plus any additional amounts the reporting entity expects to pay on behalf of its co-obligor. Additionally, the guidance requires the entity to disclose the nature and amount of the obligation, as well as other information about those obligations. PacifiCorp adopted this guidance on January 1, 2014. The adoption of this guidance did not have a material impact on PacifiCorp's disclosures included within Notes to Consolidated Financial Statements.

Property_Plant_and_Equipment_N

Property, Plant and Equipment, Net	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment, Net [Abstract]
Property, Plant and Equipment Disclosure [Text Block]	(3)    Property, Plant and Equipment, Net
	Property, plant and equipment, net consists of the following as of December 31 (in millions):
		Depreciable Life	2014			2013
	Property, plant and equipment:
	Generation	10 - 67 years	$	11,932		$	11,058
	Transmission	58 - 75 years	5,392			5,235
	Distribution	20 - 70 years	6,197			6,030
	Intangible plant(1)	5 - 65 years	879			857
	Other	5 - 60 years	1,413			1,688
	Property, plant and equipment in-service		25,813			24,868
	Accumulated depreciation and amortization		(8,026		)	(7,686		)
	Net property, plant and equipment in-service		17,787			17,182
	Construction work-in-progress		932			1,325
	Total property, plant and equipment, net		$	18,719		$	18,507
	-1	Computer software costs included in intangible plant are initially assigned a depreciable life of 5 to 10 years.
	The average depreciation and amortization rate applied to depreciable property, plant and equipment was 3.0% for the year ended December 31, 2014 and 2.8% for each of the years ended December 31, 2013 and 2012.
	Depreciation Study
	As a result of PacifiCorp's depreciation study approved by its state regulatory commissions, PacifiCorp revised its depreciation rates effective January 1, 2014. The approved depreciation rates resulted in an increase in depreciation expense of $35 million for the year ended December 31, 2014 as compared to the year ended December 31, 2013.
	Unallocated Acquisition Adjustments
	PacifiCorp has unallocated acquisition adjustments that represent the excess of costs of the acquired interests in property, plant and equipment purchased from the entity that first devoted the assets to utility service over their net book value in those assets. These unallocated acquisition adjustments included in other property, plant and equipment had an original cost of $143 million and $159 million as of December 31, 2014 and 2013, respectively, and accumulated depreciation of $107 million and $118 million as of December 31, 2014 and 2013, respectively.

Jointly_Owned_Utility_Faciliti

Jointly Owned Utility Facilities	12 Months Ended
	Dec. 31, 2014
Jointly Owned Utility Plant, Net Ownership Amount [Abstract]
Jointly Owned Utility Facilities Disclosure [Text Block]	(4)    Jointly Owned Utility Facilities
	Under joint facility ownership agreements with other utilities, PacifiCorp, as a tenant in common, has undivided interests in jointly owned generation, transmission and distribution facilities. PacifiCorp accounts for its proportionate share of each facility, and each joint owner has provided financing for its share of each facility. Operating costs of each facility are assigned to joint owners based on their percentage of ownership or energy production, depending on the nature of the cost. Operating costs and expenses on the Consolidated Statements of Operations include PacifiCorp's share of the expenses of these facilities.
	The amounts shown in the table below represent PacifiCorp's share in each jointly owned facility as of December 31, 2014 (dollars in millions):
				Facility		Accumulated		Construction
		PacifiCorp		in		Depreciation and		Work-in-
		Share		Service		Amortization		Progress
	Jim Bridger Nos. 1 - 4	67	%	$	1,134	$	554	$	116
	Hunter No. 1	94		467		144		—
	Hunter No. 2	60		290		88		1
	Wyodak	80		450		183		5
	Colstrip Nos. 3 and 4	10		231		125		1
	Hermiston (1)	50		175		67		1
	Craig Nos. 1 and 2	19		323		203		7
	Hayden No. 1	25		55		27		12
	Hayden No. 2	13		33		18		3
	Foote Creek	79		37		22		—
	Transmission and distribution facilities	Various		347		65		—
	Total			$	3,542	$	1,496	$	146
	-1	As discussed in Note 17, PacifiCorp has contracted to purchase the remaining 50% of the output of the Hermiston generating facility.

Regulatory_Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2014
Regulatory Assets and Liabilities Disclosure [Abstract]
Regulatory Matters [Text Block]	(5)    Regulatory Matters
	Utah Mine Disposition
	Due to quality issues with the coal reserves at PacifiCorp's Deer Creek mine in Utah and rising costs at PacifiCorp's wholly owned subsidiary, Energy West Mining Company, PacifiCorp believes the Deer Creek coal reserves are no longer able to be economically mined. As a result, in December 2014, PacifiCorp filed applications with the Utah Public Service Commission ("UPSC"), the Oregon Public Utility Commission ("OPUC"), the Wyoming Public Service Commission ("WPSC") and the Idaho Public Utilities Commission ("IPUC") seeking certain approvals, prudence determinations and accounting orders to close its Deer Creek mining operations, sell certain Utah mining assets, enter into a replacement coal supply agreement, amend an existing coal supply agreement, withdraw from the United Mine Workers of America ("UMWA") 1974 Pension Trust and settle PacifiCorp's other postretirement benefit obligation for UMWA participants (collectively, the "Utah Mine Disposition"). PacifiCorp also filed an advice letter with the California Public Utilities Commission ("CPUC"). The asset sales and coal supply agreements are contingent upon regulatory approvals for which orders are expected to be issued in the second quarter of 2015. As a result of the Utah Mine Disposition, PacifiCorp believes abandonment of the Deer Creek mine assets, sale of the specified Utah mining assets and withdrawal from the UMWA 1974 Pension Trust are probable. PacifiCorp expects to transfer funds from its other postretirement plan assets to the UMWA in June 2015 to effectuate the settlement of the portion of the obligation related to UMWA participants.
	Regulatory Assets
	Regulatory assets represent costs that are expected to be recovered in future rates. PacifiCorp's regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):
		Weighted
		Average
		Remaining
		Life	2014		2013
	Deferred income taxes(1)	26 years	$	446	$	461
	Employee benefit plans(2)	8 years	491		390
	Utah mine disposition(3)	Various	194		—
	Unamortized contract values	8 years	123		146
	Deferred net power costs	1 year	122		139
	Unrealized loss on derivative contracts	4 years	85		55
	Other	Various	244		193
	Total regulatory assets		$	1,705	$	1,384
	Reflected as:
	Current assets		$	131	$	94
	Noncurrent assets		1,574		1,290
	Total regulatory assets		$	1,705	$	1,384
	-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.
	-2	Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in rates when recognized.
	-3	Amounts represent regulatory assets established as a result of the Utah Mine Disposition 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 Trust withdrawal and closure costs incurred to date considered probable of recovery.
	PacifiCorp had regulatory assets not earning a return on investment of $1.505 billion and $1.244 billion as of December 31, 2014 and 2013, respectively.
	Regulatory Liabilities
	Regulatory liabilities represent income to be recognized or amounts to be returned to customers in future periods. PacifiCorp's regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):
		Weighted
		Average
		Remaining
		Life	2014		2013
	Cost of removal(1)	26 years	$	873	$	843
	Deferred income taxes	Various	13		21
	Other	Various	58		70
	Total regulatory liabilities		$	944	$	934
	Reflected as:
	Current liabilities		$	34	$	55
	Noncurrent liabilities		910		879
	Total regulatory liabilities		$	944	$	934
	-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.

Shortterm_Debt_and_Other_Finan

Short-term Debt and Other Financing Agreements	12 Months Ended
	Dec. 31, 2014
Short-term Debt and Other Financing Agreements [Abstract]
Short-term Debt [Text Block]	(6)    Short-term Debt and Other Financing Agreements
	The following table summarizes PacifiCorp's availability under its credit facilities as of December 31 (in millions):
	2014:00:00
	Credit facilities	$	1,200
	Less:
	Short-term debt	(20		)
	Letters of credit and tax-exempt bond support	(398		)
	Net credit facilities	$	782
	2013:00:00
	Credit facilities	$	1,200
	Less:
	Short-term debt	—
	Letters of credit and tax-exempt bond support	(321		)
	Net credit facilities	$	879
	PacifiCorp has a $600 million unsecured credit facility expiring in June 2017 and a $600 million unsecured credit facility expiring in March 2018. These credit facilities, which support PacifiCorp's commercial paper program, certain series of its tax-exempt bond obligations and provide for the issuance of letters of credit, have a variable interest rate based on the London Interbank Offered Rate or a base rate, at PacifiCorp's option, plus a spread that varies based on PacifiCorp's credit ratings for its senior unsecured long-term debt securities. As of December 31, 2014, the weighted average interest rate on commercial paper borrowings outstanding was 0.43%. These credit facilities require that PacifiCorp's ratio of consolidated debt, including current maturities, to total capitalization not exceed 0.65 to 1.0 as of the last day of each quarter. As of December 31, 2014, PacifiCorp was in compliance with the covenants of its credit facilities.
	As of December 31, 2014 and 2013, PacifiCorp had $451 million and $559 million, respectively, of fully available letters of credit issued under committed arrangements, of which $270 million as of December 31, 2014 and 2013 were issued under the credit facilities. These letters of credit support PacifiCorp's variable-rate tax-exempt bond obligations and expire through March 2017.
	As of December 31, 2014, PacifiCorp had approximately $16 million of additional letters of credit issued on its behalf to provide credit support for certain transactions as required by third parties. These letters of credit were all undrawn as of December 31, 2014 and have provisions that automatically extend the annual expiration dates for an additional year unless the issuing bank elects not to renew a letter of credit prior to the expiration date.

Longterm_Debt_and_Capital_Leas

Long-term Debt and Capital Lease Obligations	12 Months Ended
	Dec. 31, 2014
Long-term Debt and Capital Lease Obligations, Including Current Maturities [Abstract]
Debt and Capital Leases Disclosures [Text Block]	(7)    Long-term Debt and Capital Lease Obligations
	PacifiCorp's long-term debt and capital lease obligations were as follows as of December 31 (in millions):
		2014									2013
								Average					Average
		Principal			Carrying			Interest			Carrying		Interest
		Amount			Value			Rate			Value		Rate
	First mortgage bonds:
	5.50% to 8.635%, due through 2019	$	862		$	861		5.63	%		$	1,070	5.53	%
	2.95% to 8.53%, due 2021 to 2024	1,899			1,897			4.09			1,472		4.23
	6.71% due 2026	100			100			6.71			100		6.71
	5.90% to 7.70%, due 2031 to 2034	500			499			6.98			499		6.98
	5.25% to 6.35%, due 2035 to 2039	2,800			2,792			5.97			2,791		5.97
	4.10% due 2042	300			299			4.1			299		4.1
	Tax-exempt bond obligations:
	Variable rates, due 2015 to 2025(1)	223			223			0.03			325		0.17
	Variable rates, due 2015 to 2024(1)(2)	221			221			0.02			221		0.06
	Variable rates, due 2016 to 2025(2)	36			36			0.22			51		0.22
	Variable rates, due 2017 to 2018	91			91			0.22			—		—
	Total long-term debt	7,032			7,019						6,828
	Capital lease obligations:
	8.75% to 14.61%, due through 2035	34			34			11.33			49		11.47
	Total long-term debt and capital lease
	obligations	$	7,066		$	7,053					$	6,877
	Reflected as:
		2014			2013
	Current portion of long-term debt and capital lease obligations	$	134		$	238
	Long-term debt and capital lease obligations	6,919			6,639
	Total long-term debt and capital lease obligations	$	7,053		$	6,877
	1)	Supported by $451 million and $559 million of fully available letters of credit issued under committed bank arrangements as of December 31, 2014 and 2013, respectively.
	2)	Secured by pledged first mortgage bonds registered to and held by the tax-exempt bond trustee generally with the same interest rates, maturity dates and redemption provisions as the tax-exempt bond obligations.
	PacifiCorp's long-term debt generally includes provisions that allow PacifiCorp to redeem the first mortgage bonds in whole or in part at any time through the payment of a make-whole premium. Variable-rate tax-exempt bond obligations are generally redeemable at par value.
	In March 2014, PacifiCorp issued $425 million of its 3.60% First Mortgage Bonds due April 2024. The net proceeds were used to fund capital expenditures and for general corporate purposes, including retirement of short-term debt that was partially incurred to pay a $500 million common stock dividend in March 2014 to PPW Holdings LLC, a wholly owned subsidiary of BHE and PacifiCorp's direct parent company ("PPW Holdings").
	PacifiCorp currently has regulatory authority from the OPUC and the IPUC to issue an additional $1.575 billion of long-term debt. PacifiCorp must make a notice filing with the Washington Utilities and Transportation Commission prior to any future issuance. PacifiCorp currently has an effective shelf registration statement filed with the United States Securities and Exchange Commission expected to provide for future first mortgage bond issuances through October 2016.
	The issuance of PacifiCorp's first mortgage bonds is limited by available property, earnings tests and other provisions of PacifiCorp's mortgage. Approximately $25 billion of PacifiCorp's eligible property (based on original cost) was subject to the lien of the mortgage as of December 31, 2014.
	PacifiCorp has entered into long-term agreements that qualify as capital leases and expire at various dates through March 2035 for transportation services, power purchase agreements and real estate. The transportation services agreements included as capital leases are for the right to use pipeline facilities to provide natural gas to two of PacifiCorp's generating facilities. Net capital lease assets of $34 million and $49 million as of December 31, 2014 and 2013, respectively, were included in property, plant and equipment, net in the Consolidated Balance Sheets.
	As of December 31, 2014, the annual maturities of long-term debt and capital lease obligations, excluding unamortized discounts and including interest on capital lease obligations, for 2015 and thereafter are as follows (in millions):
		Long-term			Capital Lease
		Debt			Obligations			Total
	2015	$	132		$	5		$	137
	2016	57			5			62
	2017	52			10			62
	2018	586			6			592
	2019	350			5			355
	Thereafter	5,855			31			5,886
	Total	7,032			62			7,094
	Unamortized discount	(13		)	—			(13		)
	Amounts representing interest	—			(28		)	(28		)
	Total	$	7,019		$	34		$	7,053

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	(8)    Income Taxes
	Income tax expense (benefit) consists of the following for the years ended December 31 (in millions):
		2014				2013				2012
	Current:
	Federal	$	2			$	54			$	(112	)
	State	10				13				(3		)
	Total	12				67				(115		)
	Deferred:
	Federal	260				204				283
	State	43				29				33
	Total	303				233				316
	Investment tax credits	(6		)		(3		)		(4		)
	Total income tax expense	$	309			$	297			$	197
	A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax expense is as follows for the years ended December 31:
		2014			2013			2012
	Federal statutory income tax rate	35	%		35	%		35	%
	State income taxes, net of federal income tax benefit	3			3			3
	Federal income tax credits(1)	(7	)		(7	)		(9	)
	Other	—			(1	)		(2	)
	Effective income tax rate	31	%		30	%		27	%
	-1	Primarily attributable to the impact of federal renewable electricity production tax credits for qualifying wind-powered generating facilities that extend 10 years from the date the facilities were placed in-service.
	The net deferred income tax liability consists of the following as of December 31 (in millions):
		2014				2013
	Deferred income tax assets:
	Regulatory liabilities	$	362			$	355
	Employee benefits	184				98
	Derivative contracts and unamortized contract values	79				76
	State carryforwards	68				68
	Loss contingencies	70				67
	Asset retirement obligations	47				48
	Other	92				86
		902				798
	Deferred income tax liabilities:
	Property, plant and equipment	(4,780		)		(4,528		)
	Regulatory assets	(647		)		(525		)
	Other	(56		)		(38		)
		(5,483		)		(5,091		)
	Net deferred income tax liability	$	(4,581	)		$	(4,293	)
	Reflected as:
	Deferred income taxes - current assets	$	28			$	66
	Deferred income taxes - noncurrent liabilities	(4,609		)		(4,359		)
		$	(4,581	)		$	(4,293	)
	The following table provides PacifiCorp's net operating loss and tax credit carryforwards and expiration dates as of December 31, 2014 (in millions):
			State
	Net operating loss carryforwards		$	1,417
	Deferred income taxes on net operating loss carryforwards		$	52
	Expiration dates		2015 - 2032
	Tax credit carryforwards		$	16
	Expiration dates		2015 - indefinite
	The United States Internal Revenue Service has effectively settled its examination of PacifiCorp's income tax returns through December 31, 2009. State agencies have closed their examinations of PacifiCorp's income tax returns through March 31, 2006, except for the December 31,1995 and 1997 tax years in Utah and the March 31, 2004, 2005 and 2006 tax years in Colorado and Utah.
	As of December 31, 2014 and 2013, PacifiCorp had unrecognized tax benefits totaling $14 million and $13 million, respectively, related to tax positions for which ultimate deductibility is highly certain but for which there is uncertainty as to the timing of such deductibility. Recognition of these tax benefits, other than applicable interest and penalties, would not affect PacifiCorp's effective income tax rate.

Employee_Benefit_Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Employee Benefit Plans [Text Block]
	-9	Employee Benefit Plans
	PacifiCorp sponsors defined benefit pension and other postretirement benefit plans that cover the majority of its employees, as well as a defined contribution 401(k) employee savings plan ("401(k) Plan"). In addition, PacifiCorp contributes to a joint trustee pension plan and a subsidiary contributes to a multiemployer pension plan for benefits offered to certain bargaining units.
	Pension and Other Postretirement Benefit Plans
	PacifiCorp's pension plans include a non-contributory defined benefit pension plan, the PacifiCorp Retirement Plan ("Retirement Plan"), and the Supplemental Executive Retirement Plan ("SERP"). The Retirement Plan is closed to all non-union employees hired after January 1, 2008. The SERP was closed to new participants as of March 21, 2006 and froze future accruals for active participants as of December 31, 2014. All non-union Retirement Plan participants hired prior to January 1, 2008 that did not elect to receive equivalent fixed contributions to the 401(k) Plan effective January 1, 2009 continue to earn benefits based on a cash balance formula. In general for union employees, benefits under the Retirement Plan were frozen at various dates from December 31, 2007 through December 31, 2011 as they are now being provided with enhanced 401(k) Plan benefits. However, certain limited union Retirement Plan participants continue to earn benefits under the Retirement Plan based on the employee's years of service and a final average pay formula.
	PacifiCorp's other postretirement benefit plan provides healthcare and life insurance benefits to eligible retirees.
	Utah Mine Disposition and Labor Agreement
	In conjunction with the Utah Mine Disposition described in Note 5, in December 2014, Energy West Mining Company reached a labor settlement with the UMWA covering union employees at PacifiCorp’s Deer Creek mining operations. As a result of the labor settlement, the UMWA agreed to assume PacifiCorp's other postretirement benefit obligation associated with UMWA plan participants in exchange for PacifiCorp transferring $150 million to the UMWA. Transfer of the assets to the UMWA and settlement of this obligation is expected to occur in June 2015, which will result in a remeasurement of the other postretirement plan assets and benefit obligation. No curtailment accounting will be triggered as a result of the settlement due to an insignificant impact to the average remaining service lives in the plan.
	As a result of the intended closure of the Deer Creek mining operations, withdrawal from the UMWA 1974 Pension Trust could be triggered as early as spring 2015. Refer to "Multiemployer and Joint Trustee Pension Plans" below for further information regarding the withdrawal.
	Net Periodic Benefit Cost
	For purposes of calculating the expected return on plan assets, a market-related value is used. The market-related value of plan assets is calculated by spreading the difference between expected and actual investment returns over a five-year period beginning after the first year in which they occur.
	Net periodic benefit cost for the plans included the following components for the years ended December 31 (in millions):
		Pension												Other Postretirement
		2014				2013				2012				2014				2013			2012
	Service cost	$	5			$	6			$	7			$	6			$	9		$	7
	Interest cost	57				54				61				28				25			28
	Expected return on plan assets	(76		)		(74		)		(74		)		(31		)		(30		)	(30		)
	Net amortization	29				48				34				2				8			4
	Net periodic benefit cost	$	15			$	34			$	28			$	5			$	12		$	9
	Funded Status
	The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions):
		Pension								Other Postretirement
		2014				2013				2014				2013
	Plan assets at fair value, beginning of year	$	1,171			$	1,012			$	486			$	424
	Employer contributions	10				63				1				8
	Participant contributions	—				—				7				7
	Actual return on plan assets	53				213				25				86
	Benefits paid	(88		)		(117		)		(37		)		(39		)
	Plan assets at fair value, end of year	$	1,146			$	1,171			$	482			$	486
	The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions):
		Pension								Other Postretirement
		2014				2013				2014				2013
	Benefit obligation, beginning of year	$	1,230			$	1,391			$	598			$	632
	Service cost	5				6				6				9
	Interest cost	57				54				28				25
	Participant contributions	—				—				7				7
	Actuarial loss (gain)	174				(104		)		(63		)		(36		)
	Benefits paid	(88		)		(117		)		(37		)		(39		)
	Benefit obligation, end of year	$	1,378			$	1,230			$	539			$	598
	Accumulated benefit obligation, end of year	$	1,378			$	1,229
	The actuarial gain associated with the other postretirement benefit obligation during the year ended December 31, 2014 includes a gain that reduced the benefit obligation resulting from the $150 million to be transferred to the UMWA in June 2015 as a result of the contractually binding labor settlement.
	The funded status of the plans and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions):
		Pension								Other Postretirement
		2014				2013				2014				2013
	Plan assets at fair value, end of year	$	1,146			$	1,171			$	482			$	486
	Less - Benefit obligation, end of year	1,378				1,230				539				598
	Funded status	$	(232	)		$	(59	)		$	(57	)		$	(112	)
	Amounts recognized on the Consolidated Balance Sheets:
	Other current liabilities	$	(4	)		$	(4	)		$	—			$	—
	Other long-term liabilities	(228		)		(55		)		(57		)		(112		)
	Amounts recognized	$	(232	)		$	(59	)		$	(57	)		$	(112	)
	The SERP has no plan assets; however, PacifiCorp has a Rabbi trust that holds corporate-owned life insurance and other investments to provide funding for the future cash requirements of the SERP. The cash surrender value of all of the policies included in the Rabbi trust, net of amounts borrowed against the cash surrender value, plus the fair market value of other Rabbi trust investments, was $51 million and $48 million as of December 31, 2014 and 2013, respectively. These assets are not included in the plan assets in the above table, but are reflected in noncurrent other assets on the Consolidated Balance Sheets.
	Unrecognized Amounts
	The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions):
		Pension								Other Postretirement
		2014				2013				2014				2013
	Net loss	$	520			$	361			$	41			$	108
	Prior service credit	(21		)		(29		)		(26		)		(33		)
	Regulatory deferrals	(3		)		(4		)		2				2
	Total	$	496			$	328			$	17			$	77
	A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2014 and 2013 is as follows (in millions):
						Accumulated
						Other
		Regulatory				Comprehensive
	Asset				Loss				Total
Pension
Balance, December 31, 2012	$	599			$	19			$	618
Net gain arising during the year	(239		)		(3		)		(242		)
Net amortization	(47		)		(1		)		(48		)
Total	(286		)		(4		)		(290		)
Balance, December 31, 2013	313				15				328
Net loss arising during the year	189				8				197
Net amortization	(28		)		(1		)		(29		)
Total	161				7				168
Balance, December 31, 2014	$	474			$	22			$	496
	Regulatory
	Asset
Other Postretirement
Balance, December 31, 2012	$	177
Net gain arising during the year	(92		)
Net amortization	(8		)
Total	(100		)
Balance, December 31, 2013	77
Net gain arising during the year	(58		)
Net amortization	(2		)
Total	(60		)
Balance, December 31, 2014	$	17
The net loss, prior service credit and regulatory deferrals that will be amortized in 2015 into net periodic benefit cost are estimated to be as follows (in millions):
		Net				Prior Service				Regulatory
		Loss				Credit				Deferrals				Total
Pension		$	50			$	(8	)		$	(1	)		$	41
Other postretirement		2				(7		)		1				(4		)
Total		$	52			$	(15	)		$	—			$	37
Plan Assumptions
Assumptions used to determine benefit obligations and net periodic benefit cost were as follows:
	Pension									Other Postretirement
	2014			2013			2012			2014			2013			2012
Benefit obligations as of December 31:
Discount rate	4	%		4.8	%		4.05	%		3.9	%		4.9	%		4.1	%
Rate of compensation increase	2.75			3			3			N/A			N/A			N/A
Net periodic benefit cost for the years ended December 31:
Discount rate	4.8	%		4.05	%		4.9	%		4.9	%		4.1	%		4.95	%
Expected return on plan assets	7.5			7.5			7.5			7.5			7.5			7.5
Rate of compensation increase	3			3			3.5			N/A			N/A			N/A
In establishing its assumption as to the expected return on plan assets, PacifiCorp utilizes the asset allocation and return assumptions for each asset class based on forward-looking views of the financial markets and historical performance.
	2014			2013
Assumed healthcare cost trend rates as of December 31:
Healthcare cost trend rate assumed for next year	8	%		8	%
Rate that the cost trend rate gradually declines to	5	%		5	%
Year that the rate reaches the rate it is assumed to remain at	2025			2019
A one percentage-point change in assumed healthcare cost trend rates would have the following effects (in millions):
	Increase (Decrease)
	One Percentage-Point				One Percentage-Point
	Increase				Decrease
Increase (decrease) in:
Total service and interest cost for the year ended December 31, 2014	$	3			$	(2	)
Other postretirement benefit obligation as of December 31, 2014	—				—
Contributions and Benefit Payments
Employer contributions to the pension and other postretirement benefit plans are expected to be $4 million and $- million, respectively, during 2015. Funding to PacifiCorp's Retirement Plan trust is based upon the actuarially determined costs of the plan and the requirements of the Internal Revenue Code, the Employee Retirement Income Security Act of 1974 ("ERISA") and the Pension Protection Act of 2006, as amended ("PPA"). PacifiCorp considers contributing additional amounts from time to time in order to achieve certain funding levels specified under the PPA. PacifiCorp's funding policy for its other postretirement benefit plan is to generally contribute an amount equal to the net periodic benefit cost, subject to tax deductibility limitations and other considerations.
The expected benefit payments to participants in PacifiCorp's pension and other postretirement benefit plans for 2015 through 2019 and for the five years thereafter are summarized below (in millions):
	Projected Benefit Payments
	Pension				Other Postretirement
2015	$	106			$	184
2016	111				29
2017	108				28
2018	107				28
2019	109				27
2020 - 2024	465				126
Projected benefit payments for the other postretirement plan in 2015 include the $150 million to be transferred to the UMWA in June 2015 as a result of the contractually binding labor settlement with the UMWA.
Plan Assets
Investment Policy and Asset Allocations
PacifiCorp's investment policy for its pension and other postretirement benefit plans is to balance risk and return through a diversified portfolio of debt securities, equity securities and other alternative investments. Maturities for debt securities are managed to targets consistent with prudent risk tolerances. The plans retain outside investment advisors to manage plan investments within the parameters outlined by the PacifiCorp Pension Committee. The investment portfolio is managed in line with the investment policy with sufficient liquidity to meet near-term benefit payments.
The target allocations (percentage of plan assets) for PacifiCorp's pension and other postretirement benefit plan assets are as follows as of December 31, 2014:
	Pension(1)		Other Postretirement(1)
	%		%
Debt securities(2)	33 - 37		33 - 37
Equity securities(2)	53 - 57		61 - 65
Limited partnership interests	12-Aug		3-Jan
Other	0 - 1		0 - 1
-1	PacifiCorp's Retirement Plan trust includes a separate account that is used to fund benefits for the other postretirement benefit plan. In addition to this separate account, the assets for the other postretirement benefit plan are held in Voluntary Employees' Beneficiary Association ("VEBA") trusts, each of which has its own investment allocation strategies. Target allocations for the other postretirement benefit plan include the separate account of the Retirement Plan trust and the VEBA trusts.
-2	For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.
Fair Value Measurements
The following table presents the fair value of plan assets, by major category, for PacifiCorp's defined benefit pension plan (in millions):
		Input Levels for Fair Value Measurements
		Level 1(1)				Level 2(1)				Level 3(1)				Total
As of December 31, 2014
Cash equivalents		$	—			$	8			$	—			$	8
Debt securities:
United States government obligations		15				—				—				15
Corporate obligations		—				53				—				53
Municipal obligations		—				8				—				8
Agency, asset and mortgage-backed obligations		—				48				—				48
Equity securities:
United States companies		488				—				—				488
International companies		16				—				—				16
Investment funds(2)		217				223				—				440
Limited partnership interests(3)		—				—				70				70
Total		$	736			$	340			$	70			$	1,146
As of December 31, 2013
Cash equivalents		$	—			$	18			$	—			$	18
Debt securities:
United States government obligations		13				—				—				13
International government obligations		—				1				—				1
Corporate obligations		—				48				—				48
Municipal obligations		—				8				—				8
Agency, asset and mortgage-backed obligations		—				50				—				50
Equity securities:
United States companies		489				—				—				489
International companies		16				—				—				16
Investment funds(2)		215				227				—				442
Limited partnership interests(3)		—				—				86				86
Total		$	733			$	352			$	86			$	1,171
-1	Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy.
-2	Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 50% and 50%, respectively, for 2014 and 2013, and are invested in United States and international securities of approximately 43% and 57%, respectively, for 2014 and 42% and 58%, respectively, for 2013.
-3	Limited partnership interests include several funds that invest primarily in buyout, growth equity, venture capital and real estate.
The following table presents the fair value of plan assets, by major category, for PacifiCorp's defined benefit other postretirement plan (in millions):
		Input Levels for Fair Value Measurements
		Level 1(1)				Level 2(1)				Level 3(1)				Total
As of December 31, 2014
Cash and cash equivalents(2)		$	139			$	—			$	—			$	139
Debt securities:
United States government obligations		8				—				—				8
Corporate obligations		—				18				—				18
Municipal obligations		—				2				—				2
Agency, asset and mortgage-backed obligations		—				16				—				16
Equity securities:
United States companies		112				—				—				112
International companies		4				—				—				4
Investment funds(3)		84				94				—				178
Limited partnership interests(4)		—				—				5				5
Total		$	347			$	130			$	5			$	482
As of December 31, 2013
Cash and cash equivalents		$	3			$	1			$	—			$	4
Debt securities:
United States government obligations		1				—				—				1
Corporate obligations		—				4				—				4
Municipal obligations		—				1				—				1
Agency, asset and mortgage-backed obligations		—				4				—				4
Equity securities:
United States companies		167				—				—				167
International companies		6				—				—				6
Investment funds(3)		173				120				—				293
Limited partnership interests(4)		—				—				6				6
Total		$	350			$	130			$	6			$	486
-1	Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy.
-2	In December 2014, PacifiCorp began to migrate funds to cash and cash equivalents in anticipation of the $150 million to be transferred to the UMWA in June 2015 as a result of the other postretirement settlement. Remaining investments were rebalanced to align to target investment allocations.
-3	Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 63% and 37%, respectively, for 2014 and 49% and 51%, respectively, for 2013, and are invested in United States and international securities of approximately 64% and 36%, respectively, for 2014 and 70% and 30%, respectively, for 2013.
-4	Limited partnership interests include several funds that invest primarily in buyout, growth equity, venture capital and real estate.
For level 1 investments, a readily observable quoted market price or net asset value of an identical security in an active market is used to record the fair value. For level 2 investments, the fair value is determined using pricing models or unquoted net asset values based on observable market inputs. For level 3 investments, the fair value is determined using unobservable inputs, such as estimated future cash flows, purchase multiples paid in other comparable third-party transactions or other information. Most investments in limited partnership interests are valued at estimated fair value based on the pension and other postretirement benefit plans' proportionate shares of the partnerships' fair value as recorded in the partnerships' most recently available financial statements adjusted for recent activity and estimated returns. The fair values recorded in the partnerships' financial statements are generally determined based on closing public market prices for publicly traded securities and as determined by the general partners for other investments based on factors including estimated future cash flows, purchase multiples paid in other comparable third-party transactions, comparable public company trading multiples and other information. One of the limited partnerships is valued at the unit price calculated by the general partner primarily based on independent appraised values of the underlying property holdings.
The following table reconciles the beginning and ending balances of PacifiCorp's plan assets measured at fair value using significant Level 3 inputs for the years ended December 31 (in millions):
		Limited Partnership Interests
		Pension				Other Postretirement
Balance, December 31, 2011		$	71			$	6
Actual return on plan assets still held at December 31, 2012		7				—
Purchases, sales, distributions and settlements		18				1
Balance, December 31, 2012		96				7
Actual return on plan assets still held at December 31, 2013		16				1
Purchases, sales, distributions and settlements		(26		)		(2		)
Balance, December 31, 2013		86				6
Actual return on plan assets still held at December 31, 2014		(1		)		—
Purchases, sales, distributions and settlements		(15		)		(1		)
Balance, December 31, 2014		$	70			$	5
Multiemployer and Joint Trustee Pension Plans
PacifiCorp contributes to the PacifiCorp/IBEW Local 57 Retirement Trust Fund ("Local 57 Trust Fund") (plan number 001) and its subsidiary, Energy West Mining Company, contributes to the UMWA 1974 Pension Trust (plan number 002). Contributions to these pension plans are based on the terms of collective bargaining agreements.
As a result of the Utah Mine Disposition and UMWA labor settlement, PacifiCorp believes withdrawal by its subsidiary, Energy West Mining Company, from the UMWA 1974 Pension Trust is probable. As a result, PacifiCorp recorded its best estimate of the withdrawal obligation in December 2014 and deferred the portion of the obligation considered probable of recovery to a regulatory asset. The most recent estimate of the withdrawal obligation provided by the UMWA 1974 Pension Trust is $97 million for a withdrawal occurring by July 1, 2015. In the event of withdrawal, Energy West Mining Company may elect to make a lump sum payment or annual installment payments to settle the withdrawal obligation. PacifiCorp is seeking recovery of the withdrawal obligation from its customers as part of the regulatory filings associated with the Utah Mine Disposition.
The Local 57 Trust Fund is a joint trustee plan such that the board of trustees is represented by an equal number of trustees from PacifiCorp and the union. The Local 57 Trust Fund was established pursuant to the provisions of the Taft-Hartley Act and although formed with the ability for other employers to participate in the plan, there are no other employers that participate in this plan.
The risk of participating in multiemployer pension plans generally differs from single-employer plans in that assets are pooled such that contributions by one employer may be used to provide benefits to employees of other participating employers and plan assets cannot revert back to employers. If an employer ceases participation in the plan, the employer may be obligated to pay a withdrawal liability based on the participants' unfunded, vested benefits in the plan. This is expected to occur upon Energy West Mining Company's withdrawal from the UMWA 1974 Pension Trust. If participating employers withdraw from a multiemployer plan, the unfunded obligations of the plan may be borne by the remaining participating employers, including any employers that may have recently withdrawn. Furthermore, to the extent a participating employer defaults on its obligation to the plan, the remaining employers may be allocated a share of the defaulting employer's obligation for unfunded vested benefits.
The following table presents PacifiCorp's and Energy West Mining Company's participation in individually significant joint trustee and multiemployer pension plans for the years ended December 31 (dollars in millions):
				PPA zone status or
				plan funded status percentage for
				plan years beginning July 1,										Contributions(1)
Plan name		Employer Identification Number		2014		2013		2012		Funding improvement plan		Surcharge imposed under PPA(1)		2014				2013			2012		Year contributions to plan exceeded more than 5% of total contributions(2)
UMWA 1974 Pension Trust		52-1050282		Critical		Seriously Endangered		Seriously Endangered		Implemented		Yes		$	2			$	3		$	3	None
Local 57 Trust Fund		87-0640888		At least 80%		At least 80%		At least 80%		None		None		$	9			$	9		$	12	2013, 2012, 2011
-1	PacifiCorp's and Energy West Mining Company's minimum contributions to the plans are based on the amount of wages paid to employees covered by the Local 57 Trust Fund collective bargaining agreements and the number of mining hours worked for the UMWA 1974 Pension Trust, respectively, subject to ERISA minimum funding requirements. As a result of the plan's critical status, Energy West Mining Company was required to begin paying a surcharge for hours worked on and after December 1, 2014.
-2	For the UMWA 1974 Pension Trust, information is for plan years beginning July 1, 2012 and 2011. Information for the plan years beginning July 1, 2014 and 2013 is not yet available. For the Local 57 Trust Fund, information is for plan years beginning July 1, 2013, 2012 and 2011. Information for the plan year beginning July 1, 2014 is not yet available.
The current collective bargaining agreements governing the Local 57 Trust Fund expire in January 2016. The current collective bargaining agreement governing the UMWA 1974 Pension Trust expires in June 2016.
Defined Contribution Plan
PacifiCorp's 401(k) plan covers substantially all employees. PacifiCorp's contributions are based primarily on each participant's level of contribution and cannot exceed the maximum allowable for tax purposes. PacifiCorp's contributions to the 401(k) plan were $34 million, $35 million and $36 million for the years ended December 31, 2014, 2013 and 2012, respectively.

Asset_Retirement_Obligations

Asset Retirement Obligations	12 Months Ended
	Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligation [Text Block]	(10)    Asset Retirement Obligations
	PacifiCorp estimates its ARO liabilities based upon detailed engineering calculations of the amount and timing of the future cash spending for a third party to perform the required work. Spending estimates are escalated for inflation and then discounted at a credit-adjusted, risk-free rate. Changes in estimates could occur for a number of reasons, including changes in laws and regulations, plan revisions, inflation and changes in the amount and timing of the expected work.
	PacifiCorp does not recognize liabilities for AROs for which the fair value cannot be reasonably estimated. Due to the indeterminate removal date, the fair value of the associated liabilities on certain transmission, distribution and other assets cannot currently be estimated, and no amounts are recognized on the Consolidated Financial Statements other than those included in the cost of removal regulatory liability established via approved depreciation rates in accordance with accepted regulatory practices. Cost of removal regulatory liabilities totaled $873 million and $843 million as of December 31, 2014 and 2013, respectively.
	The following table reconciles the beginning and ending balances of PacifiCorp's ARO liabilities for the years ended December 31 (in millions):
		2014			2013
	Beginning balance	$	138		$	127
	Change in estimated costs	(3		)	3
	Additions	—			8
	Retirements	(6		)	(6		)
	Accretion	6			6
	Ending balance	$	135		$	138
	Reflected as:
	Other current liabilities	$	21		$	18
	Other long-term liabilities	114			120
		$	135		$	138
	Certain of PacifiCorp's decommissioning and reclamation obligations relate to jointly owned facilities and mine sites. PacifiCorp is committed to pay a proportionate share of the decommissioning or reclamation costs. In the event of a default by any of the other joint participants, PacifiCorp may be obligated to absorb, directly or by paying additional sums to the entity, a proportionate share of the defaulting party's liability. PacifiCorp's estimated share of the decommissioning and reclamation obligations are primarily recorded as ARO liabilities.
	In December 2014, the Environmental Protection Agency released its final rule regulating the management and disposal of coal combustion byproducts resulting from the operation of coal-fueled generating facilities, including requirements for the operation and closure of surface impoundment and ash landfill facilities. The final rule will be effective 180 days after it is published in the Federal Register. Under the final rule, surface impoundments and landfills utilized for coal combustion byproducts may need to be closed unless they can meet the more stringent regulatory requirements. PacifiCorp is currently evaluating the requirements and costs of the new rule and cannot determine the impact on its ARO liabilities at this time.

Risk_Management_and_Hedging_Ac

Risk Management and Hedging Activities	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	(11)    Risk Management and Hedging Activities
	PacifiCorp is exposed to the impact of market fluctuations in commodity prices and interest rates. PacifiCorp is principally exposed to electricity, natural gas, coal and fuel oil commodity price risk as it has an obligation to serve retail customer load in its service territories. PacifiCorp's load and generating facilities represent substantial underlying commodity positions. Exposures to commodity prices consist mainly of variations in the price of fuel required to generate electricity and wholesale electricity that is purchased and sold. Commodity prices are subject to wide price swings as supply and demand are impacted by, among many other unpredictable items, weather, market liquidity, generating facility availability, customer usage, storage, and transmission and transportation constraints. Interest rate risk exists on variable-rate debt and future debt issuances. PacifiCorp does not engage in a material amount of proprietary trading activities.
	PacifiCorp has established a risk management process that is designed to identify, assess, monitor, report, manage and mitigate each of the various types of risk involved in its business. To mitigate a portion of its commodity price risk, PacifiCorp uses commodity derivative contracts, which may include forwards, options, swaps and other agreements, to effectively secure future supply or sell future production generally at fixed prices. PacifiCorp manages its interest rate risk by limiting its exposure to variable interest rates primarily through the issuance of fixed-rate long-term debt and by monitoring market changes in interest rates. Additionally, PacifiCorp may from time to time enter into interest rate derivative contracts, such as interest rate swaps or locks, to mitigate PacifiCorp's exposure to interest rate risk. No interest rate derivatives were in place during the periods presented. PacifiCorp does not hedge all of its commodity price and interest rate risks, thereby exposing the unhedged portion to changes in market prices.
	There have been no significant changes in PacifiCorp's accounting policies related to derivatives. Refer to Notes 2 and 12 for additional information on derivative contracts.
	The following table, which reflects master netting arrangements and excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of PacifiCorp's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions):
		Other							Other			Other
		Current				Other			Current			Long-term
		Assets				Assets			Liabilities			Liabilities			Total
	As of December 31, 2014
	Not designated as hedging contracts(1):
	Commodity assets	$	28			$	—		$	1		$	—		$	29
	Commodity liabilities	(10		)		—			(55		)	(49		)	(114		)
	Total	18				—			(54		)	(49		)	(85		)
	Total derivatives	18				—			(54		)	(49		)	(85		)
	Cash collateral receivable	—				—			14			14			28
	Total derivatives - net basis	$	18			$	—		$	(40	)	$	(35	)	$	(57	)
	As of December 31, 2013
	Not designated as hedging contracts(1):
	Commodity assets	$	11			$	—		$	2		$	1		$	14
	Commodity liabilities	(1		)		—			(29		)	(39		)	(69		)
	Total	10				—			(27		)	(38		)	(55		)
	Total derivatives	10				—			(27		)	(38		)	(55		)
	Cash collateral receivable	—				—			—			12			12
	Total derivatives - net basis	$	10			$	—		$	(27	)	$	(26	)	$	(43	)
	-1	PacifiCorp's commodity derivatives are generally included in rates and as of December 31, 2014 and 2013, a regulatory asset of $85 million and $55 million, respectively, was recorded related to the net derivative liability of $85 million and $55 million, respectively.
	The following table reconciles the beginning and ending balances of PacifiCorp's regulatory assets and summarizes the pre-tax gains and losses on commodity derivative contracts recognized in regulatory assets, as well as amounts reclassified to earnings for the years ended December 31 (in millions):
		2014				2013
	Beginning balance	$	55			$	121
	Changes in fair value recognized in regulatory assets	45				15
	Net (losses) gains reclassified to operating revenue	(4		)		9
	Net losses reclassified to energy costs	(11		)		(90		)
	Ending balance	$	85			$	55
	Derivative Contract Volumes
	The following table summarizes the net notional amounts of outstanding commodity derivative contracts with fixed price terms that comprise the mark-to-market values as of December 31 (in millions):
		Unit of
		Measure		2014			2013
	Electricity sales	Megawatt hours		(1	)		(1	)
	Natural gas purchases	Decatherms		113			120
	Fuel oil purchases	Gallons		3			15
	Credit Risk
	PacifiCorp is exposed to counterparty credit risk associated with wholesale energy supply and marketing activities with other utilities, energy marketing companies, financial institutions and other market participants. Credit risk may be concentrated to the extent PacifiCorp's counterparties have similar economic, industry or other characteristics and due to direct or indirect relationships among the counterparties. Before entering into a transaction, PacifiCorp analyzes the financial condition of each significant wholesale counterparty, establishes limits on the amount of unsecured credit to be extended to each counterparty and evaluates the appropriateness of unsecured credit limits on an ongoing basis. To further mitigate wholesale counterparty credit risk, PacifiCorp enters into netting and collateral arrangements that may include margining and cross-product netting agreements and obtains third-party guarantees, letters of credit and cash deposits. If required, PacifiCorp exercises rights under these arrangements, including calling on the counterparty's credit support arrangement.
	Collateral and Contingent Features
	In accordance with industry practice, certain wholesale derivative contracts contain credit support provisions that in part base certain collateral requirements on credit ratings for senior unsecured debt as reported by one or more of the three recognized credit rating agencies. These derivative contracts may either specifically provide bilateral rights to demand cash or other security if credit exposures on a net basis exceed specified rating-dependent threshold levels ("credit-risk-related contingent features") or provide the right for counterparties to demand "adequate assurance" in the event of a material adverse change in PacifiCorp's creditworthiness. These rights can vary by contract and by counterparty. As of December 31, 2014, PacifiCorp's credit ratings from the three recognized credit rating agencies were investment grade.
	The aggregate fair value of PacifiCorp's derivative contracts in liability positions with specific credit-risk-related contingent features totaled $113 million and $68 million as of December 31, 2014 and 2013, respectively, for which PacifiCorp had posted collateral of $28 million and $12 million, respectively, in the form of cash deposits. If all credit-risk-related contingent features for derivative contracts in liability positions had been triggered as of December 31, 2014 and 2013, PacifiCorp would have been required to post $75 million and $51 million, respectively, of additional collateral. PacifiCorp's collateral requirements could fluctuate considerably due to market price volatility, changes in credit ratings, changes in legislation or regulation or other factors.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]
	-12	Fair Value Measurements
	The carrying value of PacifiCorp's cash, certain cash equivalents, receivables, payables, accrued liabilities and short-term borrowings approximates fair value because of the short-term maturity of these instruments. PacifiCorp has various financial assets and liabilities that are measured at fair value on the Consolidated Financial Statements using inputs from the three levels of the fair value hierarchy. A financial asset or liability classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The three levels are as follows:
	•	Level 1 - Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that PacifiCorp has the ability to access at the measurement date.
	•	Level 2 - Inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs).
	•	Level 3 - Unobservable inputs reflect PacifiCorp's judgments about the assumptions market participants would use in pricing the asset or liability since limited market data exists. PacifiCorp develops these inputs based on the best information available, including its own data.
	The following table presents PacifiCorp's assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions):
		Input Levels for Fair Value Measurements
		Level 1		Level 2			Level 3		Other(1)			Total
	As of December 31, 2014
	Assets:
	Commodity derivatives	$	—	$	25		$	4	$	(11	)	$	18
	Money market mutual funds(2)	30		—			—		—			30
		$	30	$	25		$	4	$	(11	)	$	48
	Liabilities - Commodity derivatives	$	—	$	(114	)	$	—	$	39		$	(75	)
	As of December 31, 2013
	Assets:
	Commodity derivatives	$	—	$	12		$	2	$	(4	)	$	10
	Money market mutual funds(2)	61		—			—		—			61
		$	61	$	12		$	2	$	(4	)	$	71
	Liabilities - Commodity derivatives	$	—	$	(69	)	$	—	$	16		$	(53	)
	-1	Represents netting under master netting arrangements and a net cash collateral receivable of $28 million and $12 million as of December 31, 2014 and 2013, respectively.
	-2	Amounts are included in cash and cash equivalents, other current assets and other assets on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
	Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. When available, the fair value of derivative contracts is estimated using unadjusted quoted prices for identical contracts in the market in which PacifiCorp transacts. When quoted prices for identical contracts are not available, PacifiCorp uses forward price curves. Forward price curves represent PacifiCorp's estimates of the prices at which a buyer or seller could contract today for delivery or settlement at future dates. PacifiCorp bases its forward price curves upon market price quotations, when available, or internally developed and commercial models, with internal and external fundamental data inputs. Market price quotations are obtained from independent energy brokers, exchanges, direct communication with market participants and actual transactions executed by PacifiCorp. Market price quotations for certain major electricity and natural gas trading hubs are generally readily obtainable for the first six years; therefore, PacifiCorp's forward price curves for those locations and periods reflect observable market quotes. Market price quotations for other electricity and natural gas trading hubs are not as readily obtainable for the first six years. Given that limited market data exists for these contracts, as well as for those contracts that are not actively traded, PacifiCorp uses forward price curves derived from internal models based on perceived pricing relationships to major trading hubs that are based on unobservable inputs. The estimated fair value of these derivative contracts is a function of underlying forward commodity prices, interest rates, currency rates, related volatility, counterparty creditworthiness and duration of contracts. Refer to Note 11 for further discussion regarding PacifiCorp's risk management and hedging activities.
	PacifiCorp's investments in money market mutual funds are accounted for as available-for-sale securities and are stated at fair value. PacifiCorp uses a readily observable quoted market price to record the fair value.
	PacifiCorp's long-term debt is carried at cost on the Consolidated Financial Statements. The fair value of PacifiCorp's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of PacifiCorp's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of PacifiCorp's long-term debt as of December 31 (in millions):
		2014					2013
		Carrying		Fair			Carrying		Fair
		Value		Value			Value		Value
	Long-term debt	$	7,019	$	8,358		$	6,828	$	7,626

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments Contingencies and Guarantees [Text Block]	(13)    Commitments and Contingencies
	Legal Matters
	PacifiCorp is party to a variety of legal actions arising out of the normal course of business. Plaintiffs occasionally seek punitive or exemplary damages. PacifiCorp does not believe that such normal and routine litigation will have a material impact on its consolidated financial results. PacifiCorp is also involved in other kinds of legal actions, some of which assert or may assert claims or seek to impose fines, penalties and other costs in substantial amounts and are described below.
	USA Power
	In October 2005, prior to BHE's ownership of PacifiCorp, PacifiCorp was added as a defendant to a lawsuit originally filed in February 2005 in the Third District Court of Salt Lake County, Utah ("Third District Court") by USA Power, LLC, USA Power Partners, LLC and Spring Canyon Energy, LLC (collectively, the "Plaintiff"). The Plaintiff's complaint alleged that PacifiCorp misappropriated confidential proprietary information in violation of Utah's Uniform Trade Secrets Act and accused PacifiCorp of breach of contract and related claims in regard to the Plaintiff's 2002 and 2003 proposals to build a natural gas-fueled generating facility in Juab County, Utah. In October 2007, the Third District Court granted PacifiCorp's motion for summary judgment on all counts and dismissed the Plaintiff's claims in their entirety. In a May 2010 ruling on the Plaintiff's petition for reconsideration, the Utah Supreme Court reversed summary judgment and remanded the case back to the Third District Court for further consideration. In May 2012, a jury awarded damages to the Plaintiff for breach of contract and misappropriation of a trade secret in the amounts of $18 million for actual damages and $113 million for unjust enrichment. In May 2012, the Plaintiff filed a motion seeking exemplary damages. Under the Utah Uniform Trade Secrets law, the judge may award exemplary damages in an additional amount not to exceed twice the original award. The Plaintiff also filed a motion to seek recovery of attorneys' fees in an amount equal to 40% of all amounts ultimately awarded in the case. In October 2012, PacifiCorp filed post-trial motions for a judgment notwithstanding the verdict and a new trial. As a result of a hearing in December 2012, the trial judge denied PacifiCorp's post-trial motions with the exception of reducing the aggregate amount of damages to $113 million. In January 2013, the Plaintiff filed a motion for prejudgment interest. An initial judgment was entered in April 2013 in which the trial judge denied the Plaintiff's motions for exemplary damages and prejudgment interest and ruled that PacifiCorp must pay the Plaintiff's attorneys' fees based on applying a reasonable rate to hours worked. In May 2013, a final judgment was entered against PacifiCorp in the amount of $115 million, which includes the $113 million of aggregate damages previously awarded and amounts awarded for the Plaintiff's attorneys' fees. The final judgment also ordered that postjudgment interest accrue beginning as of the date of the April 2013 initial judgment. In May 2013, PacifiCorp posted a surety bond issued by a subsidiary of Berkshire Hathaway to secure its estimated obligation. PacifiCorp strongly disagrees with the jury's verdict and is vigorously pursuing all appellate measures. Both PacifiCorp and the Plaintiff filed appeals with the Utah Supreme Court. Briefing before the Utah Supreme Court is complete and oral arguments will most likely be held in 2015. As of December 31, 2014, PacifiCorp had accrued $119 million for the final judgment and postjudgment interest, and believes the likelihood of any additional material loss is remote; however, any additional awards against PacifiCorp could also have a material effect on the consolidated financial results. Any payment of damages will be at the end of the appeals process, which could take as long as several years.
	Sanpete County, Utah Rangeland Fire
	In June 2012, a major rangeland fire occurred in Sanpete County, Utah. Certain parties allege that contact between two of PacifiCorp's transmission lines may have triggered a ground fault that led to the fire. PacifiCorp has engaged experts to review the cause and origin of the fire, as well as to assess the damages. PacifiCorp has accrued its best estimate of the potential loss and expected insurance recovery. PacifiCorp believes it is reasonably possible it may incur additional loss beyond the amount accrued, but does not believe the potential additional loss will have a material impact on its consolidated financial results.
	Environmental Laws and Regulations
	PacifiCorp is subject to federal, state and local laws and regulations regarding air and water quality, renewable portfolio standards, emissions performance standards, climate change, coal combustion byproduct disposal, hazardous and solid waste disposal, protected species and other environmental matters that have the potential to impact PacifiCorp's current and future operations. PacifiCorp believes it is in material compliance with all applicable laws and regulations.
	Hydroelectric Relicensing
	PacifiCorp's Klamath hydroelectric system is currently operating under annual licenses with the FERC. In February 2010, PacifiCorp, the United States Department of the Interior, the United States Department of Commerce, the State of California, the State of Oregon and various other governmental and non-governmental settlement parties signed the Klamath Hydroelectric Settlement Agreement ("KHSA"). Among other things, the KHSA provides that the United States Department of the Interior conduct scientific and engineering studies to assess whether removal of the Klamath hydroelectric system's mainstem dams is in the public interest and will advance restoration of the Klamath Basin's salmonid fisheries. If it is determined that dam removal should proceed, dam removal is expected to commence no earlier than 2020.
	Under the KHSA, PacifiCorp and its customers are protected from uncapped dam removal costs and liabilities. For dam removal to occur, federal legislation consistent with the KHSA must be enacted to provide, among other things, protection for PacifiCorp from all liabilities associated with dam removal activities. If Congress does not enact legislation, then PacifiCorp will resume relicensing with the FERC. In May 2014, a bill was introduced in the United States Senate that, if passed by both houses of Congress, would enact the KHSA and companion agreements that seek to resolve other water-related conflicts and restore habitat in the Klamath basin. A hearing on the bill before a Senate Energy and Natural Resources subcommittee was held in June 2014, and the bill was voted out of committee and referred to the full Senate for consideration in November 2014. However, the bill was not passed by Congress prior to the end of the 2014 session. In January 2015, the bill was re-introduced into Congress.
	In addition, the KHSA limits PacifiCorp's contribution to dam removal costs to no more than $200 million, of which up to $184 million would be collected from PacifiCorp's Oregon customers with the remainder to be collected from PacifiCorp's California customers. Additional funding of up to $250 million for dam removal costs is to be provided by the State of California. California voters approved a water bond measure in November 2014 from which the State of California's contribution towards dam removal costs will be drawn. If dam removal costs exceed the combined funding that will be available from PacifiCorp's Oregon and California customers and the State of California, sufficient funds would need to be provided by an entity other than PacifiCorp in order for the KHSA and dam removal to proceed.
	PacifiCorp has begun collection of surcharges from Oregon and California customers for their share of dam removal costs, as approved by the OPUC and the CPUC, and is depositing the proceeds into trust accounts maintained by the OPUC and the CPUC, respectively. PacifiCorp is authorized to collect the surcharges through 2019.
	As of December 31, 2014, PacifiCorp's assets included $92 million of costs associated with the Klamath hydroelectric system's mainstem dams and the associated relicensing and settlement costs, which are being depreciated and amortized in accordance with state regulatory approvals through either December 31, 2019 or December 31, 2022.
	Hydroelectric Commitments
	Certain of PacifiCorp's hydroelectric licenses contain requirements for PacifiCorp to make certain capital and operating expenditures related to its hydroelectric facilities. PacifiCorp estimates it is obligated to make capital expenditures of approximately $203 million over the next 10 years related to these licenses.
	Commitments
	PacifiCorp has the following firm commitments that are not reflected on the Consolidated Balance Sheet. Minimum payments as of December 31, 2014 are as follows (in millions):
		2015		2016		2017		2018		2019		2020 and Thereafter		Total
	Contract type:
	Purchased electricity contracts -
	commercially operable	$	167	$	90	$	65	$	61	$	58	$	292	$	733
	Purchased electricity contracts -
	non-commercially operable	3		16		64		65		65		1,078		1,291
	Fuel contracts	789		653		588		452		460		1,294		4,236
	Construction commitments	231		53		12		8		2		8		314
	Transmission	116		112		102		95		78		617		1,120
	Operating leases and easements	5		5		4		4		4		46		68
	Maintenance, service and
	other contracts	49		29		26		14		19		81		218
	Total commitments	$	1,360	$	958	$	861	$	699	$	686	$	3,416	$	7,980
	Purchased Electricity Contracts - Commercially Operable
	As part of its energy resource portfolio, PacifiCorp acquires a portion of its electricity through long-term purchases and exchange agreements. PacifiCorp has several power purchase agreements with wind-powered generating facilities that are not included in the table above as the payments are based on the amount of energy generated and there are no minimum payments. Included in the purchased electricity payments are any power purchase agreements that meet the definition of a lease. Rent expense related to those power purchase agreements that meet the definition of a lease totaled $15 million for 2014, $24 million for 2013 and $19 million for 2012.
	Included in the minimum fixed annual payments for purchased electricity above are commitments to purchase electricity from several hydroelectric systems under long-term arrangements with public utility districts. These purchases are made on a "cost-of-service" basis for a stated percentage of system output and for a like percentage of system operating expenses and debt service. These costs are included in energy costs on the Consolidated Statements of Operations. PacifiCorp is required to pay its portion of operating costs and its portion of the debt service, whether or not any electricity is produced. These arrangements accounted for less than 5% of PacifiCorp's 2014, 2013 and 2012 energy sources.
	Purchased Electricity Contracts - Non-commercially Operable
	PacifiCorp has several contracts for purchases of electricity from facilities that have not yet achieved commercial operation. To the extent any of these facilities do not achieve commercial operation, PacifiCorp has no obligation to the counterparty.
	Fuel Contracts
	PacifiCorp has "take or pay" coal and natural gas contracts that require minimum payments.
	Construction Commitments
	PacifiCorp's construction commitments included in the table above relate to firm commitments and include costs associated with investments in emissions control equipment and certain transmission and distribution projects.
	Transmission
	PacifiCorp has contracts for the right to transmit electricity over other entities' transmission lines to facilitate delivery to PacifiCorp's customers.
	Operating Leases and Easements
	PacifiCorp has non-cancelable operating leases primarily for certain operating facilities, office space, land and equipment that expire at various dates through the year ending December 31, 2092. These leases generally require PacifiCorp to pay for insurance, taxes and maintenance applicable to the leased property. Certain leases contain renewal options for varying periods and escalation clauses for adjusting rent to reflect changes in price indices. PacifiCorp also has non-cancelable easements for land on which its wind-powered generating facilities are located. Rent expense totaled $16 million for each of the years ended December 31, 2014 and 2013 and $14 million for the year ended December 31, 2012.
	Guarantees
	PacifiCorp has entered into guarantees as part of the normal course of business and the sale of certain assets. These guarantees are not expected to have a material impact on PacifiCorp's consolidated financial results.

Preferred_Stock

Preferred Stock	12 Months Ended
	Dec. 31, 2014
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Preferred Stock [Text Block]	(14)    Preferred Stock
	PacifiCorp has 3,500 thousand shares of Serial Preferred Stock authorized at the stated value of $100 per share. PacifiCorp had 24 thousand shares of Serial Preferred Stock issued and outstanding as of December 31, 2014 and 2013. The outstanding preferred stock series are non-redeemable and have annual dividend rates of 6.00% and 7.00%.
	In 2013, PacifiCorp redeemed and canceled all outstanding shares of its redeemable preferred stock at stated redemption prices, which in aggregate totaled $40 million, plus accrued and unpaid dividends.
	In the event of voluntary liquidation, all preferred stock is entitled to stated value or a specified preference amount per share plus accrued dividends. Upon involuntary liquidation, all preferred stock is entitled to stated value plus accrued dividends. Dividends on all preferred stock are cumulative. Holders also have the right to elect members to the PacifiCorp Board of Directors in the event dividends payable are in default in an amount equal to four full quarterly payments.
	PacifiCorp also has 16 million shares of No Par Serial Preferred Stock and 127 thousand shares of 5% Preferred Stock authorized, but no shares were issued or outstanding as of December 31, 2014 and 2013.

Common_Shareholders_Equity

Common Shareholder's Equity	12 Months Ended
	Dec. 31, 2014
Common Shareholder's Equity [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	(15)    Common Shareholder's Equity
	In February 2015, PacifiCorp declared a dividend of $450 million payable to PPW Holdings in March 2015.
	Through PPW Holdings, BHE is the sole shareholder of PacifiCorp's common stock. The state regulatory orders that authorized BHE's acquisition of PacifiCorp contain restrictions on PacifiCorp's ability to pay dividends to the extent that they would reduce PacifiCorp's common equity below specified percentages of defined capitalization. As of December 31, 2014, the most restrictive of these commitments prohibits PacifiCorp from making any distribution to PPW Holdings or BHE without prior state regulatory approval to the extent that it would reduce PacifiCorp's common equity below 44% of its total capitalization, excluding short-term debt and current maturities of long-term debt. The terms of this commitment treat 50% of PacifiCorp's remaining balance of preferred stock in existence prior to the acquisition of PacifiCorp by BHE as common equity. As of December 31, 2014, PacifiCorp's actual common equity percentage, as calculated under this measure, was 53.0%, and PacifiCorp would have been permitted to dividend $2.3 billion under this commitment.
	These commitments also restrict PacifiCorp from making any distributions to either PPW Holdings or BHE if PacifiCorp's senior unsecured debt rating is BBB- or lower by Standard & Poor's Rating Services or Fitch Ratings or Baa3 or lower by Moody's Investor Service, as indicated by two of the three rating services. As of December 31, 2014, PacifiCorp met the minimum required senior unsecured debt ratings for making distributions.
	PacifiCorp is also subject to a maximum debt-to-total capitalization percentage under various financing agreements as further discussed in Note 6.

Components_of_Accumulated_Othe

Components of Accumulated Other Comprehensive Loss, Net	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Comprehensive Income (Loss) Note [Text Block]	(16)    Components of Accumulated Other Comprehensive Loss, Net
	Accumulated other comprehensive loss, net consists of unrecognized amounts on retirement benefits, net of tax, of $13 million and $9 million as of December 31, 2014 and 2013, respectively.

VariableInterest_Entities

Variable-Interest Entities	12 Months Ended
	Dec. 31, 2014
Variable-Interest Entities [Abstract]
Variable Interest Entity Disclosure [Text Block]	(17)    Variable-Interest Entities
	PacifiCorp holds an undivided interest in 50% of the Hermiston generating facility (refer to Note 4), dictates when the generating facility operates, procures 100% of the natural gas for the generating facility and subsequently receives 100% of the generated electricity, 50% of which is acquired through a long-term power purchase agreement. As a result, PacifiCorp holds a variable interest in the joint owner of the remaining 50% of the facility and is the primary beneficiary. PacifiCorp has been unable to obtain the information necessary to consolidate the entity because the entity has not agreed to supply the information due to the lack of a contractual obligation to do so. PacifiCorp continues to request from the entity the information necessary to perform the consolidation; however, no information has yet been provided by the entity. Cost of the electricity purchased from the joint owner was $38 million during each of the years ended December 31, 2014 and 2013 and $37 million during the year ended December 31, 2012. The entity is operated by the equity owners and PacifiCorp has no risk of loss in relation to the entity in the event of a disaster.
	PacifiCorp holds a two-thirds interest in Bridger Coal Company ("Bridger Coal"), which supplies coal to the Jim Bridger generating facility that is owned two-thirds by PacifiCorp and one-third by PacifiCorp's joint venture partner in Bridger Coal. PacifiCorp purchases two-thirds of the coal produced by Bridger Coal, while the remaining coal is purchased by the joint venture partner. The power to direct the activities that most significantly impact Bridger Coal's economic performance are shared with the joint venture partner. Each joint venture partner is jointly and severally liable for the obligations of Bridger Coal. Bridger Coal's necessary working capital to carry out its mining operations is financed by contributions from PacifiCorp and its joint venture partner. PacifiCorp's equity investment in Bridger Coal was $192 million and $178 million as of December 31, 2014 and 2013, respectively. Refer to Note 18 for information regarding related-party transactions with Bridger Coal.

RelatedParty_Transactions

Related-Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions Disclosure [Text Block]	(18)    Related-Party Transactions
	PacifiCorp has an intercompany administrative services agreement with BHE and its subsidiaries. Amounts charged to PacifiCorp by BHE and its subsidiaries under this agreement totaled $10 million, $17 million and $15 million during the years ended December 31, 2014, 2013 and 2012, respectively. Payables associated with these administrative services were $1 million and $3 million as of December 31, 2014 and 2013, respectively. Amounts charged by PacifiCorp to BHE and its subsidiaries under this agreement totaled $10 million, $9 million and $3 million during the years ended December 31, 2014, 2013 and 2012, respectively. Receivables associated with these administrative services were $7 million and $2 million as of December 31, 2014 and 2013, respectively.
	PacifiCorp also engages in various transactions with several subsidiaries of BHE in the ordinary course of business. Services provided by these subsidiaries in the ordinary course of business and charged to PacifiCorp primarily relate to the transportation of natural gas, wholesale electricity purchases and relocation services. These expenses totaled $7 million during the year ended December 31, 2014 and $5 million during each of the years ended December 31, 2013 and 2012. Payables associated with these services were $1 million and $- million as of December 31, 2014 and 2013, respectively. Amounts charged by PacifiCorp to subsidiaries of BHE for wholesale electricity sales in the ordinary course of business totaled $5 million during the year ended December 31, 2014 and $- million during each of the years ended December 31, 2013 and 2012.
	PacifiCorp has long-term transportation contracts with BNSF Railway Company ("BNSF"), an indirect wholly owned subsidiary of Berkshire Hathaway, PacifiCorp's ultimate parent company. Transportation costs under these contracts were $39 million, $32 million and $34 million during the years ended December 31, 2014, 2013 and 2012, respectively. As of December 31, 2014 and 2013, PacifiCorp had $3 million and $2 million, respectively, of accounts payable to BNSF outstanding under these contracts, including indirect payables related to a jointly owned facility.
	PacifiCorp participated in a captive insurance program provided by MEHC Insurance Services Ltd. ("MEISL"), a wholly owned subsidiary of BHE. MEISL covered all or significant portions of the property damage and liability insurance deductibles in many of PacifiCorp's policies, as well as overhead distribution and transmission line property damage. The policy coverage period expired on March 20, 2011 and was not renewed. Receivables for claims were $2 million as of December 31, 2014 and 2013. Proceeds from claims were $- million, $1 million and $6 million during the years ended December 31, 2014, 2013 and 2012, respectively.
	PacifiCorp is party to a tax-sharing agreement and is part of the Berkshire Hathaway United States federal income tax return. As of December 31, 2014, federal and state income taxes receivable from BHE were $133 million, and as of December 31, 2013, federal and state income taxes payable to BHE were $22 million. For the years ended December 31, 2014 and 2013, cash paid for federal and state income taxes to BHE totaled $161 million and $120 million, respectively. For the year ended December 31, 2012, cash received for federal and state income taxes from BHE totaled $215 million.
	PacifiCorp transacts with its equity investees, Bridger Coal and Trapper Mining Inc. During the years ended December 31, 2014, 2013 and 2012, PacifiCorp charged Bridger Coal $3 million, $2 million and $1 million, respectively, for administrative support and management services, as well as materials, provided by PacifiCorp to Bridger Coal. Receivables for these services, as well as for certain expenses paid by PacifiCorp and reimbursed by Bridger Coal, were $4 million as of December 31, 2014 and 2013. Services provided by equity investees to PacifiCorp primarily relate to coal purchases. During the years ended December 31, 2014, 2013 and 2012, coal purchases from PacifiCorp's equity investees totaled $146 million, $152 million and $144 million, respectively. Payables to PacifiCorp's equity investees were $19 million and $23 million as of December 31, 2014 and 2013, respectively.

Supplemental_Cash_Flow_Disclos

Supplemental Cash Flow Disclosures	12 Months Ended
	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Cash Flow, Supplemental Disclosures [Text Block]	(19)    Supplemental Cash Flow Disclosures
	The summary of supplemental cash flow disclosures as of and for the years ended December 31 is as follows (in millions):
		2014		2013		2012
	Interest paid, net of amounts capitalized	$	340	$	340	$	331
	Income taxes paid (received), net	$	161	$	120	$	(205	)
	Supplemental disclosure of non-cash investing and financing activities:
	Accounts payable related to property, plant and equipment additions	$	140	$	157	$	167

Summary_of_Significant_Account1

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Consolidation and Presentation [Policy Text Block]	Basis of Consolidation and Presentation
	The Consolidated Financial Statements include the accounts of PacifiCorp and its subsidiaries in which it holds a controlling financial interest as of the financial statement date. Intercompany accounts and transactions have been eliminated.
Use of Estimates in Preparation of Financial Statements [Policy Text Block]	Use of Estimates in Preparation of Financial Statements
	The preparation of the Consolidated Financial Statements in conformity with accounting principles generally accepted in the United States of America ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the period. These estimates include, but are not limited to, the effects of regulation; certain assumptions made in accounting for pension and other postretirement benefits; asset retirement obligations ("AROs"); income taxes; unbilled revenue; valuation of certain financial assets and liabilities, including derivative contracts; and accounting for contingencies. Actual results may differ from the estimates used in preparing the Consolidated Financial Statements.
Accounting for the Effects of Certain Types of Regulation [Policy Text Block]	Accounting for the Effects of Certain Types of Regulation
	PacifiCorp prepares its financial statements in accordance with authoritative guidance for regulated operations, which recognizes the economic effects of regulation. Accordingly, PacifiCorp defers the recognition of certain costs or income if it is probable that, through the ratemaking process, there will be a corresponding increase or decrease in future rates. Regulatory assets and liabilities are established to reflect the impacts of these deferrals, which will be recognized in earnings in the periods the corresponding changes in rates occur.
	PacifiCorp continually evaluates the applicability of the guidance for regulated operations and whether its regulatory assets and liabilities are probable of inclusion in future rates by considering factors such as a change in the regulator's approach to setting rates from cost-based ratemaking to another form of regulation, other regulatory actions or the impact of competition that could limit PacifiCorp's ability to recover its costs. PacifiCorp believes the application of the guidance for regulated operations is appropriate and its existing regulatory assets and liabilities are probable of inclusion in future rates. The evaluation reflects the current political and regulatory climate at both the federal and state levels. If it becomes no longer probable that the deferred costs or income will be included in future rates, the related regulatory assets and liabilities will be written off to net income or re-established as accumulated other comprehensive income (loss) ("AOCI").
Fair Value Measurements [Policy Text Block]	Fair Value Measurements
	As defined under GAAP, fair value is the price that would be received to sell an asset or paid to transfer a liability between market participants in the principal market or in the most advantageous market when no principal market exists. Adjustments to transaction prices or quoted market prices may be required in illiquid or disorderly markets in order to estimate fair value. Different valuation techniques may be appropriate under the circumstances to determine the value that would be received to sell an asset or paid to transfer a liability in an orderly transaction. Market participants are assumed to be independent, knowledgeable, able and willing to transact an exchange and not under duress. Nonperformance or credit risk is considered in determining fair value. Considerable judgment may be required in interpreting market data used to develop the estimates of fair value. Accordingly, estimates of fair value presented herein are not necessarily indicative of the amounts that could be realized in a current or future market exchange.
Cash Equivalents and Restricted Cash and Investments [Policy Text Block]	Cash Equivalents and Restricted Cash and Investments
	Cash equivalents consist of funds invested in money market mutual funds, United States Treasury Bills and other investments with a maturity of three months or less when purchased. Cash and cash equivalents exclude amounts where availability is restricted by legal requirements, loan agreements or other contractual provisions. Restricted amounts are included in other current assets and other assets on the Consolidated Balance Sheets.
Investments [Policy Text Block]	Investments
	Available-for-sale securities are carried at fair value with realized gains and losses, as determined on a specific identification basis, recognized in earnings and unrealized gains and losses recognized in AOCI, net of tax. As of December 31, 2014 and 2013, PacifiCorp had no unrealized gains and losses on available-for-sale securities.
	PacifiCorp utilizes the equity method of accounting with respect to investments when it possesses the ability to exercise significant influence, but not control, over the operating and financial policies of the investee. The ability to exercise significant influence is presumed when an investor possesses more than 20% of the voting interests of the investee. This presumption may be overcome based on specific facts and circumstances that demonstrate the ability to exercise significant influence is restricted. In applying the equity method, PacifiCorp records the investment at cost and subsequently increases or decreases the carrying value of the investment by PacifiCorp's proportionate share of the net earnings or losses and other comprehensive income (loss) ("OCI") of the investee. PacifiCorp records dividends or other equity distributions as reductions in the carrying value of the investment.
Allowance for Doubtful Accounts [Policy Text Block]	Allowance for Doubtful Accounts
	Accounts receivable are stated at the outstanding principal amount, net of an estimated allowance for doubtful accounts. The allowance for doubtful accounts is based on PacifiCorp's assessment of the collectibility of amounts owed to PacifiCorp by its customers. This assessment requires judgment regarding the ability of customers to pay or the outcome of any pending disputes.
Derivatives [Policy Text Block]	Derivatives
	PacifiCorp employs a number of different derivative contracts, which may include forwards, options, swaps and other agreements, to manage price risk for electricity, natural gas and other commodities and interest rate risk. Derivative contracts are recorded on the Consolidated Balance Sheets as either assets or liabilities and are stated at estimated fair value unless they are designated as normal purchases or normal sales and qualify for the exception afforded by GAAP. Derivative balances reflect offsetting permitted under master netting agreements with counterparties and cash collateral paid or received under such agreements.
	Commodity derivatives used in normal business operations that are settled by physical delivery, among other criteria, are eligible for and may be designated as normal purchases or normal sales. Normal purchases or normal sales contracts are not marked-to-market and settled amounts are recognized as operating revenue or energy costs on the Consolidated Statements of Operations.
	For PacifiCorp's derivative contracts, the settled amount is generally included in rates. Accordingly, the net unrealized gains and losses associated with interim price movements on contracts that are accounted for as derivatives and probable of inclusion in rates are recorded as regulatory assets. For a derivative contract not probable of inclusion in rates, changes in the fair value are recognized in earnings.
Inventories [Policy Text Block]	Inventories
	Inventories consist of materials and supplies, coal stocks, natural gas and fuel oil, which are stated at the lower of average cost or market.
Property, Plant and Equipment, Net - General [Policy Text Block]	Property, Plant and Equipment, Net
	General
	Additions to property, plant and equipment are recorded at cost. PacifiCorp capitalizes all construction-related material, direct labor and contract services, as well as indirect construction costs, which include debt and equity allowance for funds used during construction ("AFUDC"). The cost of additions and betterments are capitalized, while costs incurred that do not improve or extend the useful lives of the related assets are generally expensed.
	Depreciation and amortization are generally computed on the straight-line method based on composite asset class lives prescribed by PacifiCorp's various regulatory authorities or over the assets' estimated useful lives. Depreciation studies are completed periodically to determine the appropriate composite asset class lives, net salvage and depreciation rates. These studies are reviewed and rates are ultimately approved by the various regulatory authorities. Net salvage includes the estimated future residual values of the assets and any estimated removal costs recovered through approved depreciation rates. Estimated removal costs are recorded as either a cost of removal regulatory liability or an ARO liability on the Consolidated Balance Sheets, depending on whether the obligation meets the requirements of an ARO. As actual removal costs are incurred, the associated liability is reduced.
	Generally when PacifiCorp retires or sells a component of regulated property, plant and equipment, it charges the original cost, net of any proceeds from the disposition, to accumulated depreciation. Any gain or loss on disposals of all other assets is recorded through earnings.
	Debt and equity AFUDC, which represent the estimated costs of debt and equity funds necessary to finance the construction of property, plant and equipment, is capitalized as a component of property, plant and equipment, with offsetting credits to the Consolidated Statements of Operations. AFUDC is computed based on guidelines set forth by the Federal Energy Regulatory Commission ("FERC"). After construction is completed, PacifiCorp is permitted to earn a return on these costs as a component of the related assets, as well as recover these costs through depreciation expense over the useful lives of the related assets.
Property, Plant and Equipment, Net - ARO [Policy Text Block]	Asset Retirement Obligations
	PacifiCorp recognizes AROs when it has a legal obligation to perform decommissioning, reclamation or removal activities upon retirement of an asset. PacifiCorp's AROs are primarily associated with its generating facilities. The fair value of an ARO liability is recognized in the period in which it is incurred, if a reasonable estimate of fair value can be made, and is added to the carrying amount of the associated asset, which is then depreciated over the remaining useful life of the asset. Subsequent to the initial recognition, the ARO liability is adjusted for any revisions to the original estimate of undiscounted cash flows (with corresponding adjustments to property, plant and equipment, net) and for accretion of the ARO liability due to the passage of time. The difference between the ARO liability, the corresponding ARO asset included in property, plant and equipment, net and amounts recovered in rates to satisfy such liabilities is recorded as a regulatory asset or liability.
Revenue Recognition [Policy Text Block]	Revenue Recognition
	Revenue is recognized as electricity is delivered or services are provided. Revenue recognized includes billed and unbilled amounts. As of December 31, 2014 and 2013, unbilled revenue was $243 million and $258 million, respectively, and is included in accounts receivable, net on the Consolidated Balance Sheets. Rates charged are established by regulators or contractual arrangements.
	The determination of sales to individual customers is based on the reading of the customer's meter, which is performed on a systematic basis throughout the month. At the end of each month, energy provided to customers since the date of the last meter reading is estimated, and the corresponding unbilled revenue is recorded. The estimate is reversed in the following month and actual revenue is recorded based on subsequent meter readings.
	The monthly unbilled revenues of PacifiCorp are determined by the estimation of unbilled energy provided during the period, the assignment of unbilled energy provided to customer classes and the average rate per customer class. Factors that can impact the estimate of unbilled energy include, but are not limited to, seasonal weather patterns, total volumes supplied to the system, line losses, economic impacts and composition of sales among customer classes.
	PacifiCorp records sales, franchise and excise taxes collected directly from customers and remitted directly to the taxing authorities on a net basis on the Consolidated Statements of Operations.
Income Taxes [Policy Text Block]	Income Taxes
	Berkshire Hathaway includes PacifiCorp in its United States federal income tax return. Consistent with established regulatory practice, PacifiCorp's provision for income taxes has been computed on a stand-alone basis.
	Deferred income tax assets and liabilities are based on differences between the financial statement and income tax basis of assets and liabilities using estimated income tax rates expected to be in effect for the year in which the differences are expected to reverse. Changes in deferred income tax assets and liabilities that are associated with components of OCI are charged or credited directly to OCI. Changes in deferred income tax assets and liabilities that are associated with income tax benefits and expense for certain property-related basis differences and other various differences that PacifiCorp is required to pass on to its customers are charged or credited directly to a regulatory asset or liability. These amounts were recognized as regulatory assets of $446 million and $461 million as of December 31, 2014 and 2013, respectively, and regulatory liabilities of $13 million and $21 million as of December 31, 2014 and 2013, respectively, and will be included in rates when the temporary differences reverse. Other changes in deferred income tax assets and liabilities are included as a component of income tax expense. Changes in deferred income tax assets and liabilities attributable to changes in enacted income tax rates are charged or credited to income tax expense or a regulatory asset or liability in the period of enactment. Valuation allowances are established when necessary to reduce deferred income tax assets to the amount that is more likely than not to be realized.
	Investment tax credits are generally deferred and amortized over the estimated useful lives of the related properties or as prescribed by various regulatory jurisdictions. Investment tax credits are included in other long-term liabilities on the Consolidated Balance Sheets and were $27 million and $32 million as of December 31, 2014 and 2013, respectively.
Income Tax Uncertainties, Policy [Policy Text Block]	In determining PacifiCorp's income taxes, management is required to interpret complex income tax laws and regulations, which includes consideration of regulatory implications imposed by PacifiCorp's various regulatory jurisdictions. PacifiCorp's income tax returns are subject to continuous examinations by federal, state and local income tax authorities that may give rise to different interpretations of these complex laws and regulations. Due to the nature of the examination process, it generally takes years before these examinations are completed and these matters are resolved. PacifiCorp recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the Consolidated Financial Statements from such a position are measured based on the largest benefit that is more likely than not to be realized upon ultimate settlement. Although the ultimate resolution of PacifiCorp's federal, state and local income tax examinations is uncertain, PacifiCorp believes it has made adequate provisions for these income tax positions. The aggregate amount of any additional income tax liabilities that may result from these examinations, if any, is not expected to have a material impact on PacifiCorp's consolidated financial results. PacifiCorp's unrecognized tax benefits are primarily included in other long-term liabilities on the Consolidated Balance Sheets. Estimated interest and penalties, if any, related to uncertain tax positions are included as a component of income tax expense on the Consolidated Statements of Operations.
Segment Information [Policy Text Block]	Segment Information
	PacifiCorp currently has one segment, which includes its regulated electric utility operations.
New Accounting Pronouncements [Policy Text Block]	New Accounting Pronouncements
	In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2014-09, which creates FASB Accounting Standards Codification ("ASC") Topic 606, "Revenue from Contracts with Customers" and supersedes ASC Topic 605, "Revenue Recognition." The guidance replaces industry-specific guidance and establishes a single five-step model to identify and recognize revenue. The core principle of the guidance is that an entity should recognize revenue upon transfer of control of promised goods or services to customers in an amount that reflects the consideration to which an entity expects to be entitled in exchange for those goods or services. Additionally, the guidance requires the entity to disclose further quantitative and qualitative information regarding the nature and amount of revenues arising from contracts with customers, as well as other information about the significant judgments and estimates used in recognizing revenues from contracts with customers. This guidance is effective for interim and annual reporting periods beginning after December 15, 2016. Early application is not permitted. This guidance may be adopted retrospectively or under a modified retrospective method where the cumulative effect is recognized at the date of initial application. PacifiCorp is currently evaluating the impact of adopting this guidance on its Consolidated Financial Statements and disclosures included within Notes to Consolidated Financial Statements.
	In February 2013, the FASB issued ASU No. 2013-04, which amends FASB ASC Topic 405, "Liabilities." The amendments in this guidance require an entity to measure obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date as the amount the reporting entity agreed to pay plus any additional amounts the reporting entity expects to pay on behalf of its co-obligor. Additionally, the guidance requires the entity to disclose the nature and amount of the obligation, as well as other information about those obligations. PacifiCorp adopted this guidance on January 1, 2014. The adoption of this guidance did not have a material impact on PacifiCorp's disclosures included within Notes to Consolidated Financial Statements.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]	The change in the balance of the allowance for doubtful accounts, which is included in accounts receivable, net on the Consolidated Balance Sheets, is summarized as follows for the years ended December 31 (in millions):
		2014			2013			2012
	Beginning balance	$	8		$	9		$	9
	Charged to operating costs and expenses, net	11			13			14
	Write-offs, net	(12		)	(14		)	(14		)
	Ending balance	$	7		$	8		$	9

Property_Plant_and_Equipment_N1

Property, Plant and Equipment, Net Property, Plant and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment, Net [Abstract]
Property, Plant, and Equipment, Net [Table Text Block]	Property, plant and equipment, net consists of the following as of December 31 (in millions):
		Depreciable Life	2014			2013
	Property, plant and equipment:
	Generation	10 - 67 years	$	11,932		$	11,058
	Transmission	58 - 75 years	5,392			5,235
	Distribution	20 - 70 years	6,197			6,030
	Intangible plant(1)	5 - 65 years	879			857
	Other	5 - 60 years	1,413			1,688
	Property, plant and equipment in-service		25,813			24,868
	Accumulated depreciation and amortization		(8,026		)	(7,686		)
	Net property, plant and equipment in-service		17,787			17,182
	Construction work-in-progress		932			1,325
	Total property, plant and equipment, net		$	18,719		$	18,507
	-1	Computer software costs included in intangible plant are initially assigned a depreciable life of 5 to 10 years.

Jointly_Owned_Utility_Faciliti1

Jointly Owned Utility Facilities Jointly Owned Utility Facilities (Tables)	12 Months Ended
	Dec. 31, 2014
Jointly Owned Utility Plant, Net Ownership Amount [Abstract]
Schedule of Jointly Owned Utility Plants [Table Text Block]	The amounts shown in the table below represent PacifiCorp's share in each jointly owned facility as of December 31, 2014 (dollars in millions):
				Facility		Accumulated		Construction
		PacifiCorp		in		Depreciation and		Work-in-
		Share		Service		Amortization		Progress
	Jim Bridger Nos. 1 - 4	67	%	$	1,134	$	554	$	116
	Hunter No. 1	94		467		144		—
	Hunter No. 2	60		290		88		1
	Wyodak	80		450		183		5
	Colstrip Nos. 3 and 4	10		231		125		1
	Hermiston (1)	50		175		67		1
	Craig Nos. 1 and 2	19		323		203		7
	Hayden No. 1	25		55		27		12
	Hayden No. 2	13		33		18		3
	Foote Creek	79		37		22		—
	Transmission and distribution facilities	Various		347		65		—
	Total			$	3,542	$	1,496	$	146
	-1	As discussed in Note 17, PacifiCorp has contracted to purchase the remaining 50% of the output of the Hermiston generating facility.

Regulatory_Matters_Regulatory_

Regulatory Matters Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2014
Regulatory Assets and Liabilities Disclosure [Abstract]
Regulatory Assets [Table Text Block]	Regulatory assets represent costs that are expected to be recovered in future rates. PacifiCorp's regulatory assets reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):
		Weighted
		Average
		Remaining
		Life	2014		2013
	Deferred income taxes(1)	26 years	$	446	$	461
	Employee benefit plans(2)	8 years	491		390
	Utah mine disposition(3)	Various	194		—
	Unamortized contract values	8 years	123		146
	Deferred net power costs	1 year	122		139
	Unrealized loss on derivative contracts	4 years	85		55
	Other	Various	244		193
	Total regulatory assets		$	1,705	$	1,384
	Reflected as:
	Current assets		$	131	$	94
	Noncurrent assets		1,574		1,290
	Total regulatory assets		$	1,705	$	1,384
	-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.
	-2	Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in rates when recognized.
	-3	Amounts represent regulatory assets established as a result of the Utah Mine Disposition 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 Trust withdrawal and closure costs incurred to date considered probable of recovery.
Regulatory Liabilities [Table Text Block]	Regulatory liabilities represent income to be recognized or amounts to be returned to customers in future periods. PacifiCorp's regulatory liabilities reflected on the Consolidated Balance Sheets consist of the following as of December 31 (in millions):
		Weighted
		Average
		Remaining
		Life	2014		2013
	Cost of removal(1)	26 years	$	873	$	843
	Deferred income taxes	Various	13		21
	Other	Various	58		70
	Total regulatory liabilities		$	944	$	934
	Reflected as:
	Current liabilities		$	34	$	55
	Noncurrent liabilities		910		879
	Total regulatory liabilities		$	944	$	934
	-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.

Shortterm_Debt_and_Other_Finan1

Short-term Debt and Other Financing Agreements Short-term Debt and Other Financing Agreements (Tables)	12 Months Ended
	Dec. 31, 2014
Short-term Debt and Other Financing Agreements [Abstract]
Schedule of Line of Credit Facilities [Table Text Block]	The following table summarizes PacifiCorp's availability under its credit facilities as of December 31 (in millions):
	2014:00:00
	Credit facilities	$	1,200
	Less:
	Short-term debt	(20		)
	Letters of credit and tax-exempt bond support	(398		)
	Net credit facilities	$	782
	2013:00:00
	Credit facilities	$	1,200
	Less:
	Short-term debt	—
	Letters of credit and tax-exempt bond support	(321		)
	Net credit facilities	$	879

Longterm_Debt_and_Capital_Leas1

Long-term Debt and Capital Lease Obligations Long-term Debt and Capital Lease Obligations (Tables)	12 Months Ended
	Dec. 31, 2014
Long-term Debt and Capital Lease Obligations, Including Current Maturities [Abstract]
Schedule of Long-term Debt Instruments [Table Text Block]	PacifiCorp's long-term debt and capital lease obligations were as follows as of December 31 (in millions):
		2014									2013
								Average					Average
		Principal			Carrying			Interest			Carrying		Interest
		Amount			Value			Rate			Value		Rate
	First mortgage bonds:
	5.50% to 8.635%, due through 2019	$	862		$	861		5.63	%		$	1,070	5.53	%
	2.95% to 8.53%, due 2021 to 2024	1,899			1,897			4.09			1,472		4.23
	6.71% due 2026	100			100			6.71			100		6.71
	5.90% to 7.70%, due 2031 to 2034	500			499			6.98			499		6.98
	5.25% to 6.35%, due 2035 to 2039	2,800			2,792			5.97			2,791		5.97
	4.10% due 2042	300			299			4.1			299		4.1
	Tax-exempt bond obligations:
	Variable rates, due 2015 to 2025(1)	223			223			0.03			325		0.17
	Variable rates, due 2015 to 2024(1)(2)	221			221			0.02			221		0.06
	Variable rates, due 2016 to 2025(2)	36			36			0.22			51		0.22
	Variable rates, due 2017 to 2018	91			91			0.22			—		—
	Total long-term debt	7,032			7,019						6,828
	Capital lease obligations:
	8.75% to 14.61%, due through 2035	34			34			11.33			49		11.47
	Total long-term debt and capital lease
	obligations	$	7,066		$	7,053					$	6,877
	Reflected as:
		2014			2013
	Current portion of long-term debt and capital lease obligations	$	134		$	238
	Long-term debt and capital lease obligations	6,919			6,639
	Total long-term debt and capital lease obligations	$	7,053		$	6,877
	1)	Supported by $451 million and $559 million of fully available letters of credit issued under committed bank arrangements as of December 31, 2014 and 2013, respectively.
	2)	Secured by pledged first mortgage bonds registered to and held by the tax-exempt bond trustee generally with the same interest rates, maturity dates and redemption provisions as the tax-exempt bond obligations.
Schedule of Maturities of Long-term Debt [Table Text Block]	As of December 31, 2014, the annual maturities of long-term debt and capital lease obligations, excluding unamortized discounts and including interest on capital lease obligations, for 2015 and thereafter are as follows (in millions):
		Long-term			Capital Lease
		Debt			Obligations			Total
	2015	$	132		$	5		$	137
	2016	57			5			62
	2017	52			10			62
	2018	586			6			592
	2019	350			5			355
	Thereafter	5,855			31			5,886
	Total	7,032			62			7,094
	Unamortized discount	(13		)	—			(13		)
	Amounts representing interest	—			(28		)	(28		)
	Total	$	7,019		$	34		$	7,053

Income_Taxes_Income_Taxes_Tabl

Income Taxes Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Components of Income Tax Expense (Benefit) [Table Text Block]	Income tax expense (benefit) consists of the following for the years ended December 31 (in millions):
		2014				2013				2012
	Current:
	Federal	$	2			$	54			$	(112	)
	State	10				13				(3		)
	Total	12				67				(115		)
	Deferred:
	Federal	260				204				283
	State	43				29				33
	Total	303				233				316
	Investment tax credits	(6		)		(3		)		(4		)
	Total income tax expense	$	309			$	297			$	197
Effective Income Tax Rate Reconciliation [Table Text Block]	A reconciliation of the federal statutory income tax rate to the effective income tax rate applicable to income before income tax expense is as follows for the years ended December 31:
		2014			2013			2012
	Federal statutory income tax rate	35	%		35	%		35	%
	State income taxes, net of federal income tax benefit	3			3			3
	Federal income tax credits(1)	(7	)		(7	)		(9	)
	Other	—			(1	)		(2	)
	Effective income tax rate	31	%		30	%		27	%
	-1	Primarily attributable to the impact of federal renewable electricity production tax credits for qualifying wind-powered generating facilities that extend 10 years from the date the facilities were placed in-service.
Components of Net Deferred Income Tax Liability [Table Text Block]	The net deferred income tax liability consists of the following as of December 31 (in millions):
		2014				2013
	Deferred income tax assets:
	Regulatory liabilities	$	362			$	355
	Employee benefits	184				98
	Derivative contracts and unamortized contract values	79				76
	State carryforwards	68				68
	Loss contingencies	70				67
	Asset retirement obligations	47				48
	Other	92				86
		902				798
	Deferred income tax liabilities:
	Property, plant and equipment	(4,780		)		(4,528		)
	Regulatory assets	(647		)		(525		)
	Other	(56		)		(38		)
		(5,483		)		(5,091		)
	Net deferred income tax liability	$	(4,581	)		$	(4,293	)
	Reflected as:
	Deferred income taxes - current assets	$	28			$	66
	Deferred income taxes - noncurrent liabilities	(4,609		)		(4,359		)
		$	(4,581	)		$	(4,293	)
Summary of Operating Loss Carryforwards [Table Text Block]	The following table provides PacifiCorp's net operating loss and tax credit carryforwards and expiration dates as of December 31, 2014 (in millions):
			State
	Net operating loss carryforwards		$	1,417
	Deferred income taxes on net operating loss carryforwards		$	52
	Expiration dates		2015 - 2032
	Tax credit carryforwards		$	16
	Expiration dates		2015 - indefinite

Employee_Benefit_Plans_Employe

Employee Benefit Plans Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Schedule of Net Benefit Costs [Table Text Block]	Net periodic benefit cost for the plans included the following components for the years ended December 31 (in millions):
		Pension												Other Postretirement
		2014				2013				2012				2014				2013			2012
	Service cost	$	5			$	6			$	7			$	6			$	9		$	7
	Interest cost	57				54				61				28				25			28
	Expected return on plan assets	(76		)		(74		)		(74		)		(31		)		(30		)	(30		)
	Net amortization	29				48				34				2				8			4
	Net periodic benefit cost	$	15			$	34			$	28			$	5			$	12		$	9
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]	The following table is a reconciliation of the fair value of plan assets for the years ended December 31 (in millions):
		Pension								Other Postretirement
		2014				2013				2014				2013
	Plan assets at fair value, beginning of year	$	1,171			$	1,012			$	486			$	424
	Employer contributions	10				63				1				8
	Participant contributions	—				—				7				7
	Actual return on plan assets	53				213				25				86
	Benefits paid	(88		)		(117		)		(37		)		(39		)
	Plan assets at fair value, end of year	$	1,146			$	1,171			$	482			$	486
Schedule of Changes in Projected Benefit Obligations [Table Text Block]	The following table is a reconciliation of the benefit obligations for the years ended December 31 (in millions):
		Pension								Other Postretirement
		2014				2013				2014				2013
	Benefit obligation, beginning of year	$	1,230			$	1,391			$	598			$	632
	Service cost	5				6				6				9
	Interest cost	57				54				28				25
	Participant contributions	—				—				7				7
	Actuarial loss (gain)	174				(104		)		(63		)		(36		)
	Benefits paid	(88		)		(117		)		(37		)		(39		)
	Benefit obligation, end of year	$	1,378			$	1,230			$	539			$	598
	Accumulated benefit obligation, end of year	$	1,378			$	1,229
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]	The funded status of the plans and the amounts recognized on the Consolidated Balance Sheets as of December 31 are as follows (in millions):
		Pension								Other Postretirement
		2014				2013				2014				2013
	Plan assets at fair value, end of year	$	1,146			$	1,171			$	482			$	486
	Less - Benefit obligation, end of year	1,378				1,230				539				598
	Funded status	$	(232	)		$	(59	)		$	(57	)		$	(112	)
	Amounts recognized on the Consolidated Balance Sheets:
	Other current liabilities	$	(4	)		$	(4	)		$	—			$	—
	Other long-term liabilities	(228		)		(55		)		(57		)		(112		)
	Amounts recognized	$	(232	)		$	(59	)		$	(57	)		$	(112	)
Schedule of Net Periodic Benefit Costs Not Yet Recognized [Table Text Block]	The portion of the funded status of the plans not yet recognized in net periodic benefit cost as of December 31 is as follows (in millions):
		Pension								Other Postretirement
		2014				2013				2014				2013
	Net loss	$	520			$	361			$	41			$	108
	Prior service credit	(21		)		(29		)		(26		)		(33		)
	Regulatory deferrals	(3		)		(4		)		2				2
	Total	$	496			$	328			$	17			$	77
	A reconciliation of the amounts not yet recognized as components of net periodic benefit cost for the years ended December 31, 2014 and 2013 is as follows (in millions):
						Accumulated
						Other
		Regulatory				Comprehensive
		Asset				Loss				Total
	Pension
	Balance, December 31, 2012	$	599			$	19			$	618
	Net gain arising during the year	(239		)		(3		)		(242		)
	Net amortization	(47		)		(1		)		(48		)
	Total	(286		)		(4		)		(290		)
	Balance, December 31, 2013	313				15				328
	Net loss arising during the year	189				8				197
	Net amortization	(28		)		(1		)		(29		)
	Total	161				7				168
	Balance, December 31, 2014	$	474			$	22			$	496
		Regulatory
		Asset
	Other Postretirement
	Balance, December 31, 2012	$	177
	Net gain arising during the year	(92		)
	Net amortization	(8		)
	Total	(100		)
	Balance, December 31, 2013	77
	Net gain arising during the year	(58		)
	Net amortization	(2		)
	Total	(60		)
	Balance, December 31, 2014	$	17
Schedule of Defined Benefit Plan, Amounts To Be Recognized In Following Year [Table Text Block]	The net loss, prior service credit and regulatory deferrals that will be amortized in 2015 into net periodic benefit cost are estimated to be as follows (in millions):
			Net				Prior Service				Regulatory
			Loss				Credit				Deferrals				Total
	Pension		$	50			$	(8	)		$	(1	)		$	41
	Other postretirement		2				(7		)		1				(4		)
	Total		$	52			$	(15	)		$	—			$	37
Schedule of Assumptions Used [Table Text Block]	Assumptions used to determine benefit obligations and net periodic benefit cost were as follows:
		Pension									Other Postretirement
		2014			2013			2012			2014			2013			2012
	Benefit obligations as of December 31:
	Discount rate	4	%		4.8	%		4.05	%		3.9	%		4.9	%		4.1	%
	Rate of compensation increase	2.75			3			3			N/A			N/A			N/A
	Net periodic benefit cost for the years ended December 31:
	Discount rate	4.8	%		4.05	%		4.9	%		4.9	%		4.1	%		4.95	%
	Expected return on plan assets	7.5			7.5			7.5			7.5			7.5			7.5
	Rate of compensation increase	3			3			3.5			N/A			N/A			N/A
	In establishing its assumption as to the expected return on plan assets, PacifiCorp utilizes the asset allocation and return assumptions for each asset class based on forward-looking views of the financial markets and historical performance.
		2014			2013
	Assumed healthcare cost trend rates as of December 31:
	Healthcare cost trend rate assumed for next year	8	%		8	%
	Rate that the cost trend rate gradually declines to	5	%		5	%
	Year that the rate reaches the rate it is assumed to remain at	2025			2019
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]	A one percentage-point change in assumed healthcare cost trend rates would have the following effects (in millions):
		Increase (Decrease)
		One Percentage-Point				One Percentage-Point
		Increase				Decrease
	Increase (decrease) in:
	Total service and interest cost for the year ended December 31, 2014	$	3			$	(2	)
	Other postretirement benefit obligation as of December 31, 2014	—				—
Schedule of Expected Benefit Payments [Table Text Block]	The expected benefit payments to participants in PacifiCorp's pension and other postretirement benefit plans for 2015 through 2019 and for the five years thereafter are summarized below (in millions):
		Projected Benefit Payments
		Pension				Other Postretirement
	2015	$	106			$	184
	2016	111				29
	2017	108				28
	2018	107				28
	2019	109				27
	2020 - 2024	465				126
Schedule of Allocation of Plan Assets [Table Text Block]	The target allocations (percentage of plan assets) for PacifiCorp's pension and other postretirement benefit plan assets are as follows as of December 31, 2014:
		Pension(1)		Other Postretirement(1)
		%		%
	Debt securities(2)	33 - 37		33 - 37
	Equity securities(2)	53 - 57		61 - 65
	Limited partnership interests	12-Aug		3-Jan
	Other	0 - 1		0 - 1
	-1	PacifiCorp's Retirement Plan trust includes a separate account that is used to fund benefits for the other postretirement benefit plan. In addition to this separate account, the assets for the other postretirement benefit plan are held in Voluntary Employees' Beneficiary Association ("VEBA") trusts, each of which has its own investment allocation strategies. Target allocations for the other postretirement benefit plan include the separate account of the Retirement Plan trust and the VEBA trusts.
	-2	For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following table presents the fair value of plan assets, by major category, for PacifiCorp's defined benefit pension plan (in millions):
			Input Levels for Fair Value Measurements
			Level 1(1)				Level 2(1)				Level 3(1)				Total
	As of December 31, 2014
	Cash equivalents		$	—			$	8			$	—			$	8
	Debt securities:
	United States government obligations		15				—				—				15
	Corporate obligations		—				53				—				53
	Municipal obligations		—				8				—				8
	Agency, asset and mortgage-backed obligations		—				48				—				48
	Equity securities:
	United States companies		488				—				—				488
	International companies		16				—				—				16
	Investment funds(2)		217				223				—				440
	Limited partnership interests(3)		—				—				70				70
	Total		$	736			$	340			$	70			$	1,146
	As of December 31, 2013
	Cash equivalents		$	—			$	18			$	—			$	18
	Debt securities:
	United States government obligations		13				—				—				13
	International government obligations		—				1				—				1
	Corporate obligations		—				48				—				48
	Municipal obligations		—				8				—				8
	Agency, asset and mortgage-backed obligations		—				50				—				50
	Equity securities:
	United States companies		489				—				—				489
	International companies		16				—				—				16
	Investment funds(2)		215				227				—				442
	Limited partnership interests(3)		—				—				86				86
	Total		$	733			$	352			$	86			$	1,171
	-1	Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy.
	-2	Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 50% and 50%, respectively, for 2014 and 2013, and are invested in United States and international securities of approximately 43% and 57%, respectively, for 2014 and 42% and 58%, respectively, for 2013.
	-3	Limited partnership interests include several funds that invest primarily in buyout, growth equity, venture capital and real estate.
	The following table presents the fair value of plan assets, by major category, for PacifiCorp's defined benefit other postretirement plan (in millions):
			Input Levels for Fair Value Measurements
			Level 1(1)				Level 2(1)				Level 3(1)				Total
	As of December 31, 2014
	Cash and cash equivalents(2)		$	139			$	—			$	—			$	139
	Debt securities:
	United States government obligations		8				—				—				8
	Corporate obligations		—				18				—				18
	Municipal obligations		—				2				—				2
	Agency, asset and mortgage-backed obligations		—				16				—				16
	Equity securities:
	United States companies		112				—				—				112
	International companies		4				—				—				4
	Investment funds(3)		84				94				—				178
	Limited partnership interests(4)		—				—				5				5
	Total		$	347			$	130			$	5			$	482
	As of December 31, 2013
	Cash and cash equivalents		$	3			$	1			$	—			$	4
	Debt securities:
	United States government obligations		1				—				—				1
	Corporate obligations		—				4				—				4
	Municipal obligations		—				1				—				1
	Agency, asset and mortgage-backed obligations		—				4				—				4
	Equity securities:
	United States companies		167				—				—				167
	International companies		6				—				—				6
	Investment funds(3)		173				120				—				293
	Limited partnership interests(4)		—				—				6				6
	Total		$	350			$	130			$	6			$	486
	-1	Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy.
	-2	In December 2014, PacifiCorp began to migrate funds to cash and cash equivalents in anticipation of the $150 million to be transferred to the UMWA in June 2015 as a result of the other postretirement settlement. Remaining investments were rebalanced to align to target investment allocations.
-3	Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 63% and 37%, respectively, for 2014 and 49% and 51%, respectively, for 2013, and are invested in United States and international securities of approximately 64% and 36%, respectively, for 2014 and 70% and 30%, respectively, for 2013.
-4	Limited partnership interests include several funds that invest primarily in buyout, growth equity, venture capital and real estate.
The following table presents PacifiCorp's assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions):
	Input Levels for Fair Value Measurements
	Level 1				Level 2				Level 3				Other(1)				Total
As of December 31, 2014
Assets:
Commodity derivatives	$	—			$	25			$	4			$	(11	)		$	18
Money market mutual funds(2)	30				—				—				—				30
	$	30			$	25			$	4			$	(11	)		$	48
Liabilities - Commodity derivatives	$	—			$	(114	)		$	—			$	39			$	(75	)
As of December 31, 2013
Assets:
Commodity derivatives	$	—			$	12			$	2			$	(4	)		$	10
Money market mutual funds(2)	61				—				—				—				61
	$	61			$	12			$	2			$	(4	)		$	71
Liabilities - Commodity derivatives	$	—			$	(69	)		$	—			$	16			$	(53	)
-1	Represents netting under master netting arrangements and a net cash collateral receivable of $28 million and $12 million as of December 31, 2014 and 2013, respectively.
-2	Amounts are included in cash and cash equivalents, other current assets and other assets on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]	The following table reconciles the beginning and ending balances of PacifiCorp's plan assets measured at fair value using significant Level 3 inputs for the years ended December 31 (in millions):
			Limited Partnership Interests
			Pension				Other Postretirement
	Balance, December 31, 2011		$	71			$	6
	Actual return on plan assets still held at December 31, 2012		7				—
	Purchases, sales, distributions and settlements		18				1
	Balance, December 31, 2012		96				7
	Actual return on plan assets still held at December 31, 2013		16				1
	Purchases, sales, distributions and settlements		(26		)		(2		)
	Balance, December 31, 2013		86				6
	Actual return on plan assets still held at December 31, 2014		(1		)		—
	Purchases, sales, distributions and settlements		(15		)		(1		)
	Balance, December 31, 2014		$	70			$	5
Schedule of Multiemployer Plans [Table Text Block]	The following table presents PacifiCorp's and Energy West Mining Company's participation in individually significant joint trustee and multiemployer pension plans for the years ended December 31 (dollars in millions):
					PPA zone status or
					plan funded status percentage for
					plan years beginning July 1,										Contributions(1)
	Plan name		Employer Identification Number		2014		2013		2012		Funding improvement plan		Surcharge imposed under PPA(1)		2014				2013			2012		Year contributions to plan exceeded more than 5% of total contributions(2)
	UMWA 1974 Pension Trust		52-1050282		Critical		Seriously Endangered		Seriously Endangered		Implemented		Yes		$	2			$	3		$	3	None
	Local 57 Trust Fund		87-0640888		At least 80%		At least 80%		At least 80%		None		None		$	9			$	9		$	12	2013, 2012, 2011
	-1	PacifiCorp's and Energy West Mining Company's minimum contributions to the plans are based on the amount of wages paid to employees covered by the Local 57 Trust Fund collective bargaining agreements and the number of mining hours worked for the UMWA 1974 Pension Trust, respectively, subject to ERISA minimum funding requirements. As a result of the plan's critical status, Energy West Mining Company was required to begin paying a surcharge for hours worked on and after December 1, 2014.
	-2	For the UMWA 1974 Pension Trust, information is for plan years beginning July 1, 2012 and 2011. Information for the plan years beginning July 1, 2014 and 2013 is not yet available. For the Local 57 Trust Fund, information is for plan years beginning July 1, 2013, 2012 and 2011. Information for the plan year beginning July 1, 2014 is not yet available.

Asset_Retirement_Obligations_A

Asset Retirement Obligations Asset Retirement Obligations (Tables)	12 Months Ended
	Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligations Disclosure [Table Text Block]	The following table reconciles the beginning and ending balances of PacifiCorp's ARO liabilities for the years ended December 31 (in millions):
		2014			2013
	Beginning balance	$	138		$	127
	Change in estimated costs	(3		)	3
	Additions	—			8
	Retirements	(6		)	(6		)
	Accretion	6			6
	Ending balance	$	135		$	138
	Reflected as:
	Other current liabilities	$	21		$	18
	Other long-term liabilities	114			120
		$	135		$	138

Risk_Management_and_Hedging_Ac1

Risk Management and Hedging Activities Risk Management and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	The following table, which reflects master netting arrangements and excludes contracts that have been designated as normal under the normal purchases or normal sales exception afforded by GAAP, summarizes the fair value of PacifiCorp's derivative contracts, on a gross basis, and reconciles those amounts to the amounts presented on a net basis on the Consolidated Balance Sheets (in millions):
		Other							Other			Other
		Current				Other			Current			Long-term
		Assets				Assets			Liabilities			Liabilities			Total
	As of December 31, 2014
	Not designated as hedging contracts(1):
	Commodity assets	$	28			$	—		$	1		$	—		$	29
	Commodity liabilities	(10		)		—			(55		)	(49		)	(114		)
	Total	18				—			(54		)	(49		)	(85		)
	Total derivatives	18				—			(54		)	(49		)	(85		)
	Cash collateral receivable	—				—			14			14			28
	Total derivatives - net basis	$	18			$	—		$	(40	)	$	(35	)	$	(57	)
	As of December 31, 2013
	Not designated as hedging contracts(1):
	Commodity assets	$	11			$	—		$	2		$	1		$	14
	Commodity liabilities	(1		)		—			(29		)	(39		)	(69		)
	Total	10				—			(27		)	(38		)	(55		)
	Total derivatives	10				—			(27		)	(38		)	(55		)
	Cash collateral receivable	—				—			—			12			12
	Total derivatives - net basis	$	10			$	—		$	(27	)	$	(26	)	$	(43	)
	-1	PacifiCorp's commodity derivatives are generally included in rates and as of December 31, 2014 and 2013, a regulatory asset of $85 million and $55 million, respectively, was recorded related to the net derivative liability of $85 million and $55 million, respectively.
Schedule of Regulatory Assets (Liabilities), Net, Unrealized Loss (Gain), Net, on Derivative Contracts [Table Text Block]	The following table reconciles the beginning and ending balances of PacifiCorp's regulatory assets and summarizes the pre-tax gains and losses on commodity derivative contracts recognized in regulatory assets, as well as amounts reclassified to earnings for the years ended December 31 (in millions):
		2014				2013
	Beginning balance	$	55			$	121
	Changes in fair value recognized in regulatory assets	45				15
	Net (losses) gains reclassified to operating revenue	(4		)		9
	Net losses reclassified to energy costs	(11		)		(90		)
	Ending balance	$	85			$	55
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]	The following table summarizes the net notional amounts of outstanding commodity derivative contracts with fixed price terms that comprise the mark-to-market values as of December 31 (in millions):
		Unit of
		Measure		2014			2013
	Electricity sales	Megawatt hours		(1	)		(1	)
	Natural gas purchases	Decatherms		113			120
	Fuel oil purchases	Gallons		3			15

Fair_Value_Measurements_Fair_V

Fair Value Measurements Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following table presents the fair value of plan assets, by major category, for PacifiCorp's defined benefit pension plan (in millions):
			Input Levels for Fair Value Measurements
			Level 1(1)			Level 2(1)			Level 3(1)			Total
	As of December 31, 2014
	Cash equivalents		$	—		$	8		$	—		$	8
	Debt securities:
	United States government obligations		15			—			—			15
	Corporate obligations		—			53			—			53
	Municipal obligations		—			8			—			8
	Agency, asset and mortgage-backed obligations		—			48			—			48
	Equity securities:
	United States companies		488			—			—			488
	International companies		16			—			—			16
	Investment funds(2)		217			223			—			440
	Limited partnership interests(3)		—			—			70			70
	Total		$	736		$	340		$	70		$	1,146
	As of December 31, 2013
	Cash equivalents		$	—		$	18		$	—		$	18
	Debt securities:
	United States government obligations		13			—			—			13
	International government obligations		—			1			—			1
	Corporate obligations		—			48			—			48
	Municipal obligations		—			8			—			8
	Agency, asset and mortgage-backed obligations		—			50			—			50
	Equity securities:
	United States companies		489			—			—			489
	International companies		16			—			—			16
	Investment funds(2)		215			227			—			442
	Limited partnership interests(3)		—			—			86			86
	Total		$	733		$	352		$	86		$	1,171
	-1	Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy.
	-2	Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 50% and 50%, respectively, for 2014 and 2013, and are invested in United States and international securities of approximately 43% and 57%, respectively, for 2014 and 42% and 58%, respectively, for 2013.
	-3	Limited partnership interests include several funds that invest primarily in buyout, growth equity, venture capital and real estate.
	The following table presents the fair value of plan assets, by major category, for PacifiCorp's defined benefit other postretirement plan (in millions):
			Input Levels for Fair Value Measurements
			Level 1(1)			Level 2(1)			Level 3(1)			Total
	As of December 31, 2014
	Cash and cash equivalents(2)		$	139		$	—		$	—		$	139
	Debt securities:
	United States government obligations		8			—			—			8
	Corporate obligations		—			18			—			18
	Municipal obligations		—			2			—			2
	Agency, asset and mortgage-backed obligations		—			16			—			16
	Equity securities:
	United States companies		112			—			—			112
	International companies		4			—			—			4
	Investment funds(3)		84			94			—			178
	Limited partnership interests(4)		—			—			5			5
	Total		$	347		$	130		$	5		$	482
	As of December 31, 2013
	Cash and cash equivalents		$	3		$	1		$	—		$	4
	Debt securities:
	United States government obligations		1			—			—			1
	Corporate obligations		—			4			—			4
	Municipal obligations		—			1			—			1
	Agency, asset and mortgage-backed obligations		—			4			—			4
	Equity securities:
	United States companies		167			—			—			167
	International companies		6			—			—			6
	Investment funds(3)		173			120			—			293
	Limited partnership interests(4)		—			—			6			6
	Total		$	350		$	130		$	6		$	486
	-1	Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy.
	-2	In December 2014, PacifiCorp began to migrate funds to cash and cash equivalents in anticipation of the $150 million to be transferred to the UMWA in June 2015 as a result of the other postretirement settlement. Remaining investments were rebalanced to align to target investment allocations.
-3	Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 63% and 37%, respectively, for 2014 and 49% and 51%, respectively, for 2013, and are invested in United States and international securities of approximately 64% and 36%, respectively, for 2014 and 70% and 30%, respectively, for 2013.
-4	Limited partnership interests include several funds that invest primarily in buyout, growth equity, venture capital and real estate.
The following table presents PacifiCorp's assets and liabilities recognized on the Consolidated Balance Sheets and measured at fair value on a recurring basis (in millions):
	Input Levels for Fair Value Measurements
	Level 1			Level 2			Level 3			Other(1)			Total
As of December 31, 2014
Assets:
Commodity derivatives	$	—		$	25		$	4		$	(11	)	$	18
Money market mutual funds(2)	30			—			—			—			30
	$	30		$	25		$	4		$	(11	)	$	48
Liabilities - Commodity derivatives	$	—		$	(114	)	$	—		$	39		$	(75	)
As of December 31, 2013
Assets:
Commodity derivatives	$	—		$	12		$	2		$	(4	)	$	10
Money market mutual funds(2)	61			—			—			—			61
	$	61		$	12		$	2		$	(4	)	$	71
Liabilities - Commodity derivatives	$	—		$	(69	)	$	—		$	16		$	(53	)
-1	Represents netting under master netting arrangements and a net cash collateral receivable of $28 million and $12 million as of December 31, 2014 and 2013, respectively.
-2	Amounts are included in cash and cash equivalents, other current assets and other assets on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
Fair Value, by Balance Sheet Grouping [Table Text Block]	PacifiCorp's long-term debt is carried at cost on the Consolidated Financial Statements. The fair value of PacifiCorp's long-term debt is a Level 2 fair value measurement and has been estimated based upon quoted market prices, where available, or at the present value of future cash flows discounted at rates consistent with comparable maturities with similar credit risks. The carrying value of PacifiCorp's variable-rate long-term debt approximates fair value because of the frequent repricing of these instruments at market rates. The following table presents the carrying value and estimated fair value of PacifiCorp's long-term debt as of December 31 (in millions):
		2014						2013
		Carrying			Fair			Carrying			Fair
		Value			Value			Value			Value
	Long-term debt	$	7,019		$	8,358		$	6,828		$	7,626

Commitments_and_Contingencies_

Commitments and Contingencies Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block]	PacifiCorp has the following firm commitments that are not reflected on the Consolidated Balance Sheet. Minimum payments as of December 31, 2014 are as follows (in millions):
		2015		2016		2017		2018		2019		2020 and Thereafter		Total
	Contract type:
	Purchased electricity contracts -
	commercially operable	$	167	$	90	$	65	$	61	$	58	$	292	$	733
	Purchased electricity contracts -
	non-commercially operable	3		16		64		65		65		1,078		1,291
	Fuel contracts	789		653		588		452		460		1,294		4,236
	Construction commitments	231		53		12		8		2		8		314
	Transmission	116		112		102		95		78		617		1,120
	Operating leases and easements	5		5		4		4		4		46		68
	Maintenance, service and
	other contracts	49		29		26		14		19		81		218
	Total commitments	$	1,360	$	958	$	861	$	699	$	686	$	3,416	$	7,980

Supplemental_Cash_Flow_Disclos1

Supplemental Cash Flow Disclosures Supplemental Cash Flow Disclosures (Tables)	12 Months Ended
	Dec. 31, 2014
Supplemental Cash Flow Information [Abstract]
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]	The summary of supplemental cash flow disclosures as of and for the years ended December 31 is as follows (in millions):
		2014		2013		2012
	Interest paid, net of amounts capitalized	$	340	$	340	$	331
	Income taxes paid (received), net	$	161	$	120	$	(205	)
	Supplemental disclosure of non-cash investing and financing activities:
	Accounts payable related to property, plant and equipment additions	$	140	$	157	$	167

Summary_of_Significant_Account3

Summary of Significant Accounting Policies Significant Accounting Policies - Investments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Significant Accounting Policies - Investments [Abstract]
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax	$0	$0

Summary_of_Significant_Account4

Summary of Significant Accounting Policies Significant Accounting Policies - Allowance for Doubtful Accounts (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning balance	$8	$9	$9
Charged to operating costs and expenses, net	11	13	14
Write-offs, net	-12	-14	-14
Ending balance	$7	$8	$9

Summary_of_Significant_Account5

Summary of Significant Accounting Policies Significant Accounting Policies - Revenue Recognition (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Significant Accounting Policies - Revenue Recognition [Abstract]
Unbilled revenue	$243	$258

Summary_of_Significant_Account6

Summary of Significant Accounting Policies Significant Accounting Policies - Income Taxes (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Regulatory assets	$1,705		$1,384
Regulatory liabilities	944		934
Investment tax credits	27		32
Deferred income taxes [Member]
Regulatory liabilities	13		21
Deferred income taxes [Member]
Regulatory assets	$446	[1]	$461	[1]
[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.

Property_Plant_and_Equipment_N2

Property, Plant and Equipment, Net Property, Plant and Equipment, Net (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property, plant and equipment in-service	$25,813		$24,868
Accumulated depreciation and amortization	-8,026		-7,686
Net property, plant and equipment in-service	17,787		17,182
Construction work-in-progress	932		1,325
Total property, plant and equipment, net	18,719		18,507
Average depreciation and amortization rate	3.00%		2.80%		2.80%
Property, plant and equipment unallocated acquisition adjustments	143		159
Accumulated depreciation for unallocated acquisition adjustments	107		118
Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life, Generation	10 years
Depreciable Life, Transmission	58 years
Depreciable Life, Distribution	20 years
Depreciable Life, Intangible plant	5 years	[1]
Depreciable Life, Other	5 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life, Generation	67 years
Depreciable Life, Transmission	75 years
Depreciable Life, Distribution	70 years
Depreciable Life, Intangible plant	65 years	[1]
Depreciable Life, Other	60 years
Generation [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment in-service	11,932		11,058
Transmission [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment in-service	5,392		5,235
Distribution [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment in-service	6,197		6,030
Intangible plant [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment in-service	879	[1]	857	[1]
Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment in-service	1,413		1,688
Computer software [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life, Intangible plant	5 years
Computer software [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Depreciable Life, Intangible plant	10 years
Service Life [Member]
Property, Plant and Equipment [Line Items]
Change in Accounting Estimates, Impact on Period of Change	$35
[1]	Computer software costs included in intangible plant are initially assigned a depreciable life of 5 to 10 years.

Jointly_Owned_Utility_Faciliti2

Jointly Owned Utility Facilities Jointly Owned Utility Facilities (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Jointly Owned Utility Plant Interests [Line Items]
Facility in Service	$3,542
Accumulated Depreciation and Amortization	1,496
Construction Work-in-Progress	146
Jim Bridger Nos. 1-4 [Member]
Jointly Owned Utility Plant Interests [Line Items]
PacifiCorp Share	67.00%
Facility in Service	1,134
Accumulated Depreciation and Amortization	554
Construction Work-in-Progress	116
Hunter No. 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
PacifiCorp Share	94.00%
Facility in Service	467
Accumulated Depreciation and Amortization	144
Construction Work-in-Progress	0
Hunter No. 2 [Member]
Jointly Owned Utility Plant Interests [Line Items]
PacifiCorp Share	60.00%
Facility in Service	290
Accumulated Depreciation and Amortization	88
Construction Work-in-Progress	1
Wyodak [Member]
Jointly Owned Utility Plant Interests [Line Items]
PacifiCorp Share	80.00%
Facility in Service	450
Accumulated Depreciation and Amortization	183
Construction Work-in-Progress	5
Colstrip Nos. 3 and 4 [Member]
Jointly Owned Utility Plant Interests [Line Items]
PacifiCorp Share	10.00%
Facility in Service	231
Accumulated Depreciation and Amortization	125
Construction Work-in-Progress	1
Hermiston [Member]
Jointly Owned Utility Plant Interests [Line Items]
PacifiCorp Share	50.00%	[1]
Facility in Service	175	[1]
Accumulated Depreciation and Amortization	67	[1]
Construction Work-in-Progress	1	[1]
Percentage of remaining output the company has contracted to purchase	50.00%
Craig Nos. 1 and 2 [Member]
Jointly Owned Utility Plant Interests [Line Items]
PacifiCorp Share	19.00%
Facility in Service	323
Accumulated Depreciation and Amortization	203
Construction Work-in-Progress	7
Hayden No. 1 [Member]
Jointly Owned Utility Plant Interests [Line Items]
PacifiCorp Share	25.00%
Facility in Service	55
Accumulated Depreciation and Amortization	27
Construction Work-in-Progress	12
Hayden No. 2 [Member]
Jointly Owned Utility Plant Interests [Line Items]
PacifiCorp Share	13.00%
Facility in Service	33
Accumulated Depreciation and Amortization	18
Construction Work-in-Progress	3
Foote Creek [Member]
Jointly Owned Utility Plant Interests [Line Items]
PacifiCorp Share	79.00%
Facility in Service	37
Accumulated Depreciation and Amortization	22
Construction Work-in-Progress	0
Transmission and distribution facilities [Member]
Jointly Owned Utility Plant Interests [Line Items]
PacifiCorp Share	Various
Facility in Service	347
Accumulated Depreciation and Amortization	65
Construction Work-in-Progress	$0
[1]	As discussed in Note 17, PacifiCorp has contracted to purchase the remaining 50% of the output of the Hermiston generating facility.

Regulatory_Matters_Regulatory_1

Regulatory Matters Regulatory Assets (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Regulatory Assets [Line Items]
Current regulatory assets	$131		$94
Noncurrent regulatory assets	1,574		1,290
Total regulatory assets	1,705		1,384
Regulatory assets not earning a return on investment	1,505		1,244
Deferred income taxes [Member]
Regulatory Assets [Line Items]
Weighted Average Remaining Life	26 years	[1]
Total regulatory assets	446	[1]	461	[1]
Employee benefit plans [Member]
Regulatory Assets [Line Items]
Weighted Average Remaining Life	8 years	[2]
Total regulatory assets	491	[2]	390	[2]
Utah mine disposition [Member]
Regulatory Assets [Line Items]
Weighted Average Remaining Life	Various	[3]
Total regulatory assets	194	[3]	0	[3]
Unamortized contract values [Member]
Regulatory Assets [Line Items]
Weighted Average Remaining Life	8 years
Total regulatory assets	123		146
Deferred net power costs [Member]
Regulatory Assets [Line Items]
Weighted Average Remaining Life	1 year
Total regulatory assets	122		139
Unrealized loss on derivative contracts [Member]
Regulatory Assets [Line Items]
Weighted Average Remaining Life	4 years
Total regulatory assets	85		55
Other [Member]
Regulatory Assets [Line Items]
Weighted Average Remaining Life	Various
Total regulatory assets	$244		$193
[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.
[2]	Represents amounts not yet recognized as a component of net periodic benefit cost that are expected to be included in rates when recognized.
[3]	Amounts represent regulatory assets established as a result of the Utah Mine Disposition 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, UMWAB 1974 Pension Trust withdrawal and closure costs incurred to date considered probable of recovery.

Regulatory_Matters_Regulatory_2

Regulatory Matters Regulatory Liabilities (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Regulatory Liabilities [Line Items]
Current regulatory liabilities	$34		$55
Noncurrent regulatory liabilities	910		879
Total regulatory liabilities	944		934
Cost of removal [Member]
Regulatory Liabilities [Line Items]
Weighted Average Remaining Life	26 years	[1]
Noncurrent regulatory liabilities	873		843
Total regulatory liabilities	873	[1]	843	[1]
Deferred income taxes [Member]
Regulatory Liabilities [Line Items]
Weighted Average Remaining Life	Various
Total regulatory liabilities	13		21
Other [Member]
Regulatory Liabilities [Line Items]
Weighted Average Remaining Life	Various
Total regulatory liabilities	$58		$70
[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.

Shortterm_Debt_and_Other_Finan2

Short-term Debt and Other Financing Agreements Short-term Debt and Other Financing Agreements (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$1,200	$1,200
Short-term debt	-20	0
Line of Credit Facility, Amounts Supported	-398	-321
Line of Credit Facility, Remaining Borrowing Capacity	782	879
Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt to capitalization ratio	0.65
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Debt, Weighted Average Interest Rate	0.43%
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Amounts Supported	-270	-270
Tax exempt bond obligations and commodity contract collateral requirement [Member]
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount	451	559
Certain transactions required by third parties [Member]
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount	16
Unsecured credit facility, $600 million, expiring June 2017 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	600
Unsecured credit facility, $600 million, expiring March 2018 [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$600

Longterm_Debt_and_Capital_Leas2

Long-term Debt and Capital Lease Obligations Schedule of Long-term Debt (Details) (USD $)	1 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Carrying Value		$7,019,000,000		$6,828,000,000
Long-term Debt and Capital Lease Obligations, Principal Amount		7,066,000,000
Current portion of long-term debt and capital lease obligations		134,000,000		238,000,000
Long-term debt and capital lease obligations		6,919,000,000		6,639,000,000
Total long-term debt and capital lease obligations		7,053,000,000		6,877,000,000
Dividends, Common Stock, Cash	500,000,000	725,000,000		500,000,000		200,000,000
Maximum amount of additional long-term debt approved by regulators		1,575,000,000
Eligible Property Subject To Lien Of Mortgages		25,000,000,000
Capital Leases, Balance Sheet, Assets by Major Class, Net		34,000,000		49,000,000
First Mortgage Bonds, 5.50% To 8.635%, Due Through 2019 [Member]
Debt Instrument [Line Items]
Principal Amount		862,000,000
Carrying Value		861,000,000		1,070,000,000
Average Interest Rate		5.63%		5.53%
First Mortgage Bonds, 2.95% To 8.53%, Due 2021 To 2024 [Member]
Debt Instrument [Line Items]
Principal Amount		1,899,000,000
Carrying Value		1,897,000,000		1,472,000,000
Average Interest Rate		4.09%		4.23%
First Mortgage Bonds, 6.71%, Due 2026 [Member]
Debt Instrument [Line Items]
Principal Amount		100,000,000
Carrying Value		100,000,000		100,000,000
Average Interest Rate		6.71%		6.71%
Debt Instrument, Interest Rate, Stated Percentage		6.71%		6.71%
First Mortgage Bonds, 5.90% To 7.70%, Due 2031 To 2034 [Member]
Debt Instrument [Line Items]
Principal Amount		500,000,000
Carrying Value		499,000,000		499,000,000
Average Interest Rate		6.98%		6.98%
First Mortgage Bonds, 5.25% To 6.35%, Due 2035 To 2039 [Member]
Debt Instrument [Line Items]
Principal Amount		2,800,000,000
Carrying Value		2,792,000,000		2,791,000,000
Average Interest Rate		5.97%		5.97%
First Mortgage Bonds, 4.10%, Due 2042 [Member]
Debt Instrument [Line Items]
Principal Amount		300,000,000
Carrying Value		299,000,000		299,000,000
Average Interest Rate		4.10%		4.10%
Debt Instrument, Interest Rate, Stated Percentage		4.10%		4.10%
Tax-exempt bond obligations, variable rate, due 2015 to 2025 [Member]
Debt Instrument [Line Items]
Principal Amount		223,000,000	[1]
Carrying Value		223,000,000	[1]	325,000,000	[1]
Average Interest Rate		0.03%	[1]	0.17%	[1]
Tax-exempt bond obligations, variable rate, due 2015 to 2024 [Member]
Debt Instrument [Line Items]
Principal Amount		221,000,000	[1],[2]
Carrying Value		221,000,000	[1],[2]	221,000,000	[1],[2]
Average Interest Rate		0.02%	[1],[2]	0.06%	[1],[2]
Tax-exempt bond obligations, variable rate, due 2016 to 2025 [Member]
Debt Instrument [Line Items]
Principal Amount		36,000,000	[2]
Carrying Value		36,000,000	[2]	51,000,000	[2]
Average Interest Rate		0.22%	[2]	0.22%	[2]
Tax-exempt bond obligations, variable rate, due 2017 to 2018 [Member]
Debt Instrument [Line Items]
Principal Amount		91,000,000
Carrying Value		91,000,000		0
Average Interest Rate		0.22%		0.00%
Long-term Debt [Member]
Debt Instrument [Line Items]
Principal Amount		7,032,000,000
Carrying Value		7,019,000,000		6,828,000,000
Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member]
Debt Instrument [Line Items]
Average Interest Rate		11.33%		11.47%
Capital Lease Obligations		34,000,000		49,000,000
First Mortgage Bonds, 3.60% Due April 2024 [Member]
Debt Instrument [Line Items]
Principal Amount	425,000,000
Debt Instrument, Interest Rate, Stated Percentage	3.60%
Minimum [Member] | First Mortgage Bonds, 5.50% To 8.635%, Due Through 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.50%		5.50%
Minimum [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2021 To 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.95%		2.95%
Minimum [Member] | First Mortgage Bonds, 5.90% To 7.70%, Due 2031 To 2034 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.90%		5.90%
Minimum [Member] | First Mortgage Bonds, 5.25% To 6.35%, Due 2035 To 2039 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.25%		5.25%
Minimum [Member] | Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.75%		8.75%
Maximum [Member] | First Mortgage Bonds, 5.50% To 8.635%, Due Through 2019 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.64%		8.64%
Maximum [Member] | First Mortgage Bonds, 2.95% To 8.53%, Due 2021 To 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.53%		8.53%
Maximum [Member] | First Mortgage Bonds, 5.90% To 7.70%, Due 2031 To 2034 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		7.70%		7.70%
Maximum [Member] | First Mortgage Bonds, 5.25% To 6.35%, Due 2035 To 2039 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		6.35%		6.35%
Maximum [Member] | Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		14.61%		14.61%
Letters of credit supporting tax-exempt bond obligations [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount		$451,000,000		$559,000,000
[1]	Supported by $451 million and $559B million of fully available letters of credit issued under committed bank arrangements as of DecemberB 31, 2014 and 2013, respectively.
[2]	Secured by pledged first mortgage bonds registered to and held by the tax-exempt bond trustee generally with the same interest rates, maturity dates and redemption provisions as the tax-exempt bond obligations.

Longterm_Debt_and_Capital_Leas3

Long-term Debt and Capital Lease Obligations Annual Maturities of Long-term Debt and Capital Lease Obligations (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Debt Instrument [Line Items]
Unamortized discount	($13)
Carrying Value	7,019	6,828
Amounts representing interest	-28
Long-term Debt Repayments of Principal and Capital Leases Future Minimum Payments in Next Twelve Months	137
Long-term Debt Repayments of Principal and Capital Leases Future Minimum Payments Due in Two Years	62
Long-term Debt Repayments of Principal and Capital Leases Future Minimum Payments Due in Three Years	62
Long-term Debt Repayments of Principal and Capital Leases Future Minimum Payments Due in Four Years	592
Long-term Debt Repayments of Principal and Capital Leases Future Minimum Payments Due in Five Years	355
Long-term Debt Repayments of Principal and Capital Leases Future Minimum Payments Due Thereafter	5,886
Total Long-term Debt Maturities and Capital Leases Future Minimum Payments	7,094
Total long-term debt and capital lease obligations	7,053	6,877
Long-term Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	132
Long-term Debt, Maturities, Repayments of Principal in Year Two	57
Long-term Debt, Maturities, Repayments of Principal in Year Three	52
Long-term Debt, Maturities, Repayments of Principal in Year Four	586
Long-term Debt, Maturities, Repayments of Principal in Year Five	350
Long-term Debt, Maturities, Repayments of Principal after Year Five	5,855
Principal Amount	7,032
Unamortized discount	-13
Carrying Value	7,019
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Capital Leases, Future Minimum Payments Due, Next Twelve Months	5
Capital Leases, Future Minimum Payments Due in Two Years	5
Capital Leases, Future Minimum Payments Due in Three Years	10
Capital Leases, Future Minimum Payments Due in Four Years	6
Capital Leases, Future Minimum Payments Due in Five Years	5
Capital Leases, Future Minimum Payments Due Thereafter	31
Capital Leases, Future Minimum Payments Due	62
Amounts representing interest	-28
Capital Lease Obligations	$34

Income_Taxes_Components_of_Inc

Income Taxes Components of Income Tax Expense (Benefit) (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Current federal	$2	$54	($112)
Current state	10	13	-3
Total current income tax expense (benefit)	12	67	-115
Deferred federal	260	204	283
Deferred state	43	29	33
Total deferred income tax expense	303	233	316
Investment tax credits	-6	-3	-4
Total income tax expense	$309	$297	$197

Income_Taxes_Reconciliation_of

Income Taxes Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal statutory income tax rate	35.00%		35.00%		35.00%
State income taxes, net of federal income tax benefit	3.00%		3.00%		3.00%
Federal income tax credits	-7.00%	[1]	-7.00%	[1]	-9.00%	[1]
Other	0.00%		-1.00%		-2.00%
Effective income tax rate	31.00%		30.00%		27.00%
Years eligible for federal renewable electricity production tax credits	10 years
[1]	Primarily attributable to the impact of federal renewable electricity production tax credits for qualifying wind-powered generating facilities that extend 10 years from the date the facilities were placed in-service.

Income_Taxes_Components_of_Net

Income Taxes Components of Net Deferred Income Tax Liability (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Deferred income tax assets:
Regulatory liabilities	$362	$355
Employee benefits	184	98
Derivative contracts and unamortized contract values	79	76
State carryforwards	68	68
Loss contingencies	70	67
Asset retirement obligations	47	48
Other	92	86
Total deferred income tax assets	902	798
Deferred income tax liabilities:
Property, plant and equipment	-4,780	-4,528
Regulatory assets	-647	-525
Other	-56	-38
Total deferred income tax liabilities	-5,483	-5,091
Net deferred income tax liability	-4,581	-4,293
Reflected as:
Deferred income taxes - current assets	28	66
Deferred income taxes - noncurrent liabilities	($4,609)	($4,359)

Income_Taxes_Net_Operating_Los

Income Taxes Net Operating Loss and Tax Credit Carryforwards (Details) (State and Local Jurisdiction [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	1,417
Deferred income taxes on net operating loss carryforwards	52
Tax credit carryforwards	16
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards expiration dates	31-Dec-15
Tax credit carryforwards expiration dates	31-Dec-15
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards expiration dates	31-Dec-32

Income_Taxes_Net_Unrecognized_

Income Taxes Net Unrecognized Tax Benefits (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Net Unrecognized Tax Benefits [Abstract]
Net unrecognized tax benefits	$14	$13

Employee_Benefit_Plans_Employe1

Employee Benefit Plans Employee Benefit Plans - Net Periodic Benefit Cost (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$5	$6	$7
Interest cost	57	54	61
Expected return on plan assets	-76	-74	-74
Net amortization	29	48	34
Net periodic benefit cost	15	34	28
Other Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	9	7
Interest cost	28	25	28
Expected return on plan assets	-31	-30	-30
Net amortization	2	8	4
Net periodic benefit cost	$5	$12	$9

Employee_Benefit_Plans_Employe2

Employee Benefit Plans Employee Benefit Plans - Funded Status (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Pension [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	$1,171	$1,012
Employer contributions	10	63
Participant contributions	0	0
Actual return on plan assets	53	213
Benefits paid	-88	-117
Plan assets at fair value, end of year	1,146	1,171	1,012
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	1,230	1,391
Service cost	5	6	7
Interest cost	57	54	61
Participant contributions	0	0
Actuarial (gain) loss	174	-104
Benefits paid	-88	-117
Benefit obligation, end of year	1,378	1,230	1,391
Accumulated benefit obligation, end of year	1,378	1,229
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Funded status of plan	-232	-59
Other current liabilities	-4	-4
Other long-term liabilities	-228	-55
Amounts recognized on balance sheet	-232	-59
Other Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amount To Be Transferred	150
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	486	424
Employer contributions	1	8
Participant contributions	7	7
Actual return on plan assets	25	86
Benefits paid	-37	-39
Plan assets at fair value, end of year	482	486	424
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, beginning of year	598	632
Service cost	6	9	7
Interest cost	28	25	28
Participant contributions	7	7
Actuarial (gain) loss	-63	-36
Benefits paid	-37	-39
Benefit obligation, end of year	539	598	632
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Funded status of plan	-57	-112
Other current liabilities	0	0
Other long-term liabilities	-57	-112
Amounts recognized on balance sheet	-57	-112
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Life Insurance, Corporate or Bank Owned, Amount	$51	$48

Employee_Benefit_Plans_Employe3

Employee Benefit Plans Employee Benefit Plans - Unrecognized Amounts (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Amortization of net loss	$52
Amoritization of prior service credit	-15
Amortization of regulatory deferrals	0
Amounts that will be amortized in next fiscal year	37
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Net loss	520	361
Prior service credit	-21	-29
Regulatory deferrals	-3	-4
Total net periodic benefit cost not yet recognized	496	328	618
Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	197	-242
Net amortization	-29	-48
Total Net Periodic Benefit Cost Not Yet Recognized, Arising During Period	168	-290
Amortization of net loss	50
Amoritization of prior service credit	-8
Amortization of regulatory deferrals	-1
Amounts that will be amortized in next fiscal year	41
Other Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Net loss	41	108
Prior service credit	-26	-33
Regulatory deferrals	2	2
Total net periodic benefit cost not yet recognized	17	77
Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Amortization of net loss	2
Amoritization of prior service credit	-7
Amortization of regulatory deferrals	1
Amounts that will be amortized in next fiscal year	-4
Regulatory Asset [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost not yet recognized	474	313	599
Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	189	-239
Net amortization	-28	-47
Total Net Periodic Benefit Cost Not Yet Recognized, Arising During Period	161	-286
Regulatory Asset [Member] | Other Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost not yet recognized	17	77	177
Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	-58	-92
Net amortization	-2	-8
Total Net Periodic Benefit Cost Not Yet Recognized, Arising During Period	-60	-100
Accumulated Other Comprehensive Loss [Member] | Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Total net periodic benefit cost not yet recognized	22	15	19
Reconciliation of Amounts Not Yet Recognized As Components of Net Periodic Benefit Cost [Roll Forward]
Net (gain) loss arising during the year	8	-3
Net amortization	-1	-1
Total Net Periodic Benefit Cost Not Yet Recognized, Arising During Period	$7	($4)

Employee_Benefit_Plans_Employe4

Employee Benefit Plans Employee Benefit Plans - Plan Assumptions (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year	8.00%	8.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%	5.00%
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate	2025	2019
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components	3
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components	-2
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation	0
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation	0
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.00%	4.80%	4.05%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	2.75%	3.00%	3.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.80%	4.05%	4.90%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Return on Assets	7.50%	7.50%	7.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	3.00%	3.00%	3.50%
Other Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	3.90%	4.90%	4.10%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.90%	4.10%	4.95%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Return on Assets	7.50%	7.50%	7.50%

Employee_Benefit_Plans_Employe5

Employee Benefit Plans Employee Benefit Plans - Contributions and Benefit Payments (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	$4
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	106
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	111
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	108
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	107
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	109
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	465
Other Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	0
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months	184
Defined Benefit Plan, Expected Future Benefit Payments, Year Two	29
Defined Benefit Plan, Expected Future Benefit Payments, Year Three	28
Defined Benefit Plan, Expected Future Benefit Payments, Year Four	28
Defined Benefit Plan, Expected Future Benefit Payments, Year Five	27
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter	126
Defined Benefit Plan, Amount To Be Transferred	$150

Employee_Benefit_Plans_Employe6

Employee Benefit Plans Employee Benefit Plans - Asset Allocations (Details)	12 Months Ended
	Dec. 31, 2014
Pension [Member] | Debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	33.00%	[1],[2]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	37.00%	[1],[2]
Pension [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	53.00%	[1],[2]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	57.00%	[1],[2]
Pension [Member] | Limited partnership interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	8.00%	[1]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	12.00%	[1]
Pension [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	0.00%	[1]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	1.00%	[1]
Other Postretirement [Member] | Debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	33.00%	[1],[2]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	37.00%	[1],[2]
Other Postretirement [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	61.00%	[1],[2]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	65.00%	[1],[2]
Other Postretirement [Member] | Limited partnership interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	1.00%	[1]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	3.00%	[1]
Other Postretirement [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum	0.00%	[1]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum	1.00%	[1]
[1]	PacifiCorp's Retirement Plan trust includes a separate account that is used to fund benefits for the other postretirement benefit plan. In addition to this separate account, the assets for the other postretirement benefit plan are held in Voluntary Employees' Beneficiary Association ("VEBA") trusts, each of which has its own investment allocation strategies. Target allocations for the other postretirement benefit plan include the separate account of the Retirement Plan trust and the VEBA trusts.
[2]	For purposes of target allocation percentages and consistent with the plans' investment policy, investment funds are allocated based on the underlying investments in debt and equity securities.

Employee_Benefit_Plans_Employe7

Employee Benefit Plans Employee Benefit Plans - Fair Value Measurements (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
In Millions, unless otherwise specified
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$1,146		$1,171		$1,012
Pension [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	736	[1]	733	[1]
Pension [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	340	[1]	352	[1]
Pension [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	70	[1]	86	[1]
Pension [Member] | Cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	8		18
Pension [Member] | Cash equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Pension [Member] | Cash equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	8	[1]	18	[1]
Pension [Member] | Cash equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Pension [Member] | US Treasury Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	15		13
Pension [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	15	[1]	13	[1]
Pension [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Pension [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Pension [Member] | Foreign Government Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets			1
Pension [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets			0	[1]
Pension [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets			1	[1]
Pension [Member] | Foreign Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets			0	[1]
Pension [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	53		48
Pension [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Pension [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	53	[1]	48	[1]
Pension [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Pension [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	8		8
Pension [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Pension [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	8	[1]	8	[1]
Pension [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Pension [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	48		50
Pension [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Pension [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	48	[1]	50	[1]
Pension [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Pension [Member] | Domestic Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	488		489
Pension [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	488	[1]	489	[1]
Pension [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Pension [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Pension [Member] | Foreign Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	16		16
Pension [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	16	[1]	16	[1]
Pension [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Pension [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Pension [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	440	[2]	442	[2]
Percentage of Investment Funds Comprised Of Equity Securitites	50.00%		50.00%
Percentage of Investment Funds Comprised Of Debt Securities	50.00%		50.00%
Percentage Of Investment Funds Invested in United States Securities	43.00%		42.00%
Percentage Of Investment Funds Invested In International Securities	57.00%		58.00%
Pension [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	217	[1],[2]	215	[1],[2]
Pension [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	223	[1],[2]	227	[1],[2]
Pension [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1],[2]	0	[1],[2]
Pension [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	70	[3]	86	[3]
Pension [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1],[3]	0	[1],[3]
Pension [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1],[3]	0	[1],[3]
Pension [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	70	[1],[3]	86	[1],[3]	96	71
Other Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	482		486		424
Defined Benefit Plan, Amount To Be Transferred	150
Other Postretirement [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	347	[1]	350	[1]
Other Postretirement [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	130	[1]	130	[1]
Other Postretirement [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	5	[1]	6	[1]
Other Postretirement [Member] | Cash equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	139	[4]	4
Other Postretirement [Member] | Cash equivalents [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	139	[1],[4]	3	[1]
Other Postretirement [Member] | Cash equivalents [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1],[4]	1	[1]
Other Postretirement [Member] | Cash equivalents [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1],[4]	0	[1]
Other Postretirement [Member] | US Treasury Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	8		1
Other Postretirement [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	8	[1]	1	[1]
Other Postretirement [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Other Postretirement [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Other Postretirement [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	18		4
Other Postretirement [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Other Postretirement [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	18	[1]	4	[1]
Other Postretirement [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Other Postretirement [Member] | Municipal Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	2		1
Other Postretirement [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Other Postretirement [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	2	[1]	1	[1]
Other Postretirement [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Other Postretirement [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	16		4
Other Postretirement [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Other Postretirement [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	16	[1]	4	[1]
Other Postretirement [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Other Postretirement [Member] | Domestic Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	112		167
Other Postretirement [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	112	[1]	167	[1]
Other Postretirement [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Other Postretirement [Member] | Domestic Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Other Postretirement [Member] | Foreign Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	4		6
Other Postretirement [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	4	[1]	6	[1]
Other Postretirement [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Other Postretirement [Member] | Foreign Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1]	0	[1]
Other Postretirement [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	178	[5]	293	[5]
Percentage of Investment Funds Comprised Of Equity Securitites	63.00%		49.00%
Percentage of Investment Funds Comprised Of Debt Securities	37.00%		51.00%
Percentage Of Investment Funds Invested in United States Securities	64.00%		70.00%
Percentage Of Investment Funds Invested In International Securities	36.00%		30.00%
Other Postretirement [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	84	[1],[5]	173	[1],[5]
Other Postretirement [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	94	[1],[5]	120	[1],[5]
Other Postretirement [Member] | Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1],[5]	0	[1],[5]
Other Postretirement [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	5	[3]	6	[3]
Other Postretirement [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1],[3]	0	[1],[3]
Other Postretirement [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	0	[1],[3]	0	[1],[3]
Other Postretirement [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$5	[1],[3]	$6	[1],[3]	$7	$6
[1]	Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy.
[2]	Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 50% and 50%, respectively, for 2014 and 2013, and are invested in United States and international securities of approximately 43% and 57%, respectively, for 2014 and 42% and 58%, respectively, for 2013.
[3]	Limited partnership interests include several funds that invest primarily in buyout, growth equity, venture capital and real estate.
[4]	In December 2014, PacifiCorp began to migrate funds to cash and cash equivalents in anticipation of the $150B million to be transferred to the UMWA in JuneB 2015 as a result of the other postretirement settlement. Remaining investments were rebalanced to align to target investment allocations.
[5]	Investment funds are substantially comprised of mutual funds and collective trust funds. These funds consist of equity and debt securities of approximately 63% and 37%, respectively, for 2014 and 49% and 51%, respectively, for 2013, and are invested in United States and international securities of approximately 64% and 36%, respectively, for 2014 and 70% and 30%, respectively, for 2013.

Employee_Benefit_Plans_Employe8

Employee Benefit Plans Employee Benefit Plans - Level 3 Rollforward (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Pension [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, end of year	$1,146		$1,171		$1,012
Pension [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, end of year	70	[1]	86	[1]
Pension [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, end of year	70	[2]	86	[2]
Pension [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	86	[1],[2]	96		71
Actual return on plan assets still held	-1		16		7
Purchases, sales, distributions and settlements	-15		-26		18
Plan assets at fair value, end of year	70	[1],[2]	86	[1],[2]	96
Other Postretirement [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, end of year	482		486		424
Other Postretirement [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, end of year	5	[1]	6	[1]
Other Postretirement [Member] | Limited Partnership Interests [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, end of year	5	[2]	6	[2]
Other Postretirement [Member] | Limited Partnership Interests [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at fair value, beginning of year	6	[1],[2]	7		6
Actual return on plan assets still held	0		1		0
Purchases, sales, distributions and settlements	-1		-2		1
Plan assets at fair value, end of year	$5	[1],[2]	$6	[1],[2]	$7
[1]	Refer to Note 12 for additional discussion regarding the three levels of the fair value hierarchy.
[2]	Limited partnership interests include several funds that invest primarily in buyout, growth equity, venture capital and real estate.

Employee_Benefit_Plans_Employe9

Employee Benefit Plans Employee Benefit Plans - Multiemployer Plans (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2015	Dec. 31, 2014		Jun. 30, 2014	Dec. 31, 2013		Jun. 30, 2013	Dec. 31, 2012
Multiemployer Plans [Line Items]
Joint Trustee Plan, Percentage By Which Joint Trustee Plan was at Least Funded	80.00%			80.00%			80.00%
Joint Trustee Plan, Period Contributions		$9	[1]		$9	[1]		$12	[1]
UMWA Pension Plan [Member]
Multiemployer Plans [Line Items]
Multiemployer Plans, Withdrawal Obligation, Most Recent Estimate		97
Multiemployer Plans, Certified Zone Status	Red			Orange			Orange
Multiemployer Plan, Period Contributions		$2	[1]		$3	[1]		$3	[1]
[1]	PacifiCorp's and Energy West Mining Company's minimum contributions to the plans are based on the amount of wages paid to employees covered by the Local 57 Trust Fund collective bargaining agreements and the number of mining hours worked for the UMWA 1974 Pension Trust, respectively, subject to ERISA minimum funding requirements. As a result of the plan's critical status, Energy West Mining Company was required to begin paying a surcharge for hours worked on and after DecemberB 1, 2014.

Recovered_Sheet1

Employee Benefit Plans Employee Benefit Plans - Defined Contribution Plans (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Defined Contribution Plan, Cost Recognized	$34	$35	$36

Asset_Retirement_Obligations_A1

Asset Retirement Obligations Asset Retirement Obligations (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Regulatory Liabilities [Line Items]
Regulatory liabilities	$910	$879
Cost of removal [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities	$873	$843

Asset_Retirement_Obligations_C

Asset Retirement Obligations Change in Asset Retirement Obligations (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	$138	$127
Change in estimated costs	-3	3
Additions	0	8
Retirements	-6	-6
Accretion	6	6
Ending balance	135	138
Reflected as:
Other current liabilities	21	18
Other long-term liabilities	114	120
Total ARO liabilitiy	$135	$138

Risk_Management_and_Hedging_Ac2

Risk Management and Hedging Activities Risk Management and Hedging Activities - Balance Sheet Location (Details) (Commodity Contract [Member], USD $)	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
In Millions, unless otherwise specified
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	($85)		($55)
Cash collateral receivable	28		12
Total derivatives - net basis	-57		-43
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	18		10
Cash collateral receivable	0		0
Total derivatives - net basis	18		10
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	0		0
Cash collateral receivable	0		0
Total derivatives - net basis	0		0
Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	-54		-27
Cash collateral receivable	14		0
Total derivatives - net basis	-40		-27
Other Long-term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative, Fair Value, Net	-49		-38
Cash collateral receivable	14		12
Total derivatives - net basis	-35		-26
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	29	[1]	14	[1]
Commodity liabilities	-114	[1]	-69	[1]
Derivative, Fair Value, Net	-85	[1]	-55	[1]
Regulatory asset	85		55		121
Not Designated as Hedging Instrument [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	28	[1]	11	[1]
Commodity liabilities	-10	[1]	-1	[1]
Derivative, Fair Value, Net	18	[1]	10	[1]
Not Designated as Hedging Instrument [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	0	[1]	0	[1]
Commodity liabilities	0	[1]	0	[1]
Derivative, Fair Value, Net	0	[1]	0	[1]
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	1	[1]	2	[1]
Commodity liabilities	-55	[1]	-29	[1]
Derivative, Fair Value, Net	-54	[1]	-27	[1]
Not Designated as Hedging Instrument [Member] | Other Long-term Liabilities [Member]
Derivatives, Fair Value [Line Items]
Commodity assets	0	[1]	1	[1]
Commodity liabilities	-49	[1]	-39	[1]
Derivative, Fair Value, Net	($49)	[1]	($38)	[1]
[1]	PacifiCorp's commodity derivatives are generally included in rates and as of DecemberB 31, 2014 and 2013, a regulatory asset of $85B million and $55B million, respectively, was recorded related to the net derivative liability of $85B million and $55B million, respectively.

Risk_Management_and_Hedging_Ac3

Risk Management and Hedging Activities Risk Management and Hedging Activities - Not Designated as Hedging Activities (Details) (Not Designated as Hedging Instrument [Member], Commodity Contract [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Not Designated as Hedging Instrument [Member] | Commodity Contract [Member]
Regulatory Assets (Liabilities), Net, Derivatives [Roll Forward]
Beginning balance	$55	$121
Changes in fair value recognized in regulatory assets	45	15
Net (losses) gains reclassified to operating revenue	-4	9
Net losses reclassified to energy costs	-11	-90
Ending balance	$85	$55

Risk_Management_and_Hedging_Ac4

Risk Management and Hedging Activities Risk Management and Hedging Activities - Derivative Contract Volumes (Details) (Commodity Contract [Member])	Dec. 31, 2014	Dec. 31, 2013
	MWh	MWh
Electricity sales, in megawatt hours [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, Nonmonetary Notional Amount	-1,000,000	-1,000,000
Natural gas purchases, in decatherms [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, Nonmonetary Notional Amount	113,000,000	120,000,000
Fuel oil purchases, in gallons [Member]
Notional Amounts of Outstanding Derivative Positions [Line Items]
Derivative, Nonmonetary Notional Amount	3,000,000	15,000,000

Risk_Management_and_Hedging_Ac5

Risk Management and Hedging Activities Risk Management and Hedging Activities - Collateral and Contingent Features (Details) (Commodity Contract [Member], USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Commodity Contract [Member]
Derivative [Line Items]
Derivative, Net Liability Position, Aggregate Fair Value	$113	$68
Collateral Already Posted, Aggregate Fair Value	28	12
Additional Collateral, Aggregate Fair Value	$75	$51

Fair_Value_Measurements_Fair_V1

Fair Value Measurements Fair Value Measurements (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	$48		$71
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	30		61
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	25		12
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	4		2
Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market mutual funds	30	[1]	61	[1]
Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market mutual funds	30	[1]	61	[1]
Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market mutual funds	0	[1]	0	[1]
Money market mutual funds [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market mutual funds	0	[1]	0	[1]
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net cash collateral receivable	28		12
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset	-11	[2]	-4	[2]
Commodity derivative assets	18		10
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset	39	[2]	16	[2]
Commodity derivative liabilities	-75		-53
Net cash collateral receivable	28		12
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	0		0
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	0		0
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	25		12
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	-114		-69
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement	4		2
Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement	$0		$0
[1]	Amounts are included in cash and cash equivalents, other current assets and other assets on the Consolidated Balance Sheets. The fair value of these money market mutual funds approximates cost.
[2]	Represents netting under master netting arrangements and a net cash collateral receivable of $28 million and $12 million as of DecemberB 31, 2014 and 2013, respectively.

Fair_Value_Measurements_Fair_V2

Fair Value Measurements Fair Value Measurements - Debt (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, carrying value	$7,019	$6,828
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	$8,358	$7,626

Commitments_and_Contingencies_1

Commitments and Contingencies Commitments and Contingencies - Legal Matters (Details) (USA Power [Member], USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Loss Contingencies [Line Items]
Loss Contingency, Original Damages Sought, Legal Fees as a Percentage of Damages	40.00%
Loss Contingency, Damages Awarded, Value	$113
Loss Contingency, Damages and Attorney Fees Awarded, Value	115
Loss Contingency Accrual	119
Amount Awarded for Actual Damages [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded by Jury, Value	18
Amount Awarded for Unjust Enrichment [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded by Jury, Value	$113

Commitments_and_Contingencies_2

Commitments and Contingencies Commitments and Contingencies - Hydroelectric Relicensing (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Dam removal costs [Line Items]
Assets	$22,267	$21,659
Klamath Hydroelectric System [Member]
Dam removal costs [Line Items]
Dam removal cost limit	200
Additional dam removal costs, California bond measure	250
Assets	92
OREGON | Klamath Hydroelectric System [Member]
Dam removal costs [Line Items]
Dam removal cost limit	184
CALIFORNIA | Klamath Hydroelectric System [Member]
Dam removal costs [Line Items]
Dam removal cost limit	$16

Commitments_and_Contingencies_3

Commitments and Contingencies Commitments and Contingencies - Hydroelectric Commitments (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Capital expenditures required by hydroelectric licenses	$203

Commitments_and_Contingencies_4

Commitments and Contingencies Commitments and Contingencies - Commitments Table (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Contractual Obligation [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$5
Operating Leases, Future Minimum Payments, Due in Two Years	5
Operating Leases, Future Minimum Payments, Due in Three Years	4
Operating Leases, Future Minimum Payments, Due in Four Years	4
Operating Leases, Future Minimum Payments, Due in Five Years	4
Operating Leases, Future Minimum Payments, Due Thereafter	46
Operating Leases, Future Minimum Payments Due	68
Contractual Obligation, Due in Next Twelve Months	1,360
Contractual Obligation, Due in Second Year	958
Contractual Obligation, Due in Third Year	861
Contractual Obligation, Due in Fourth Year	699
Contractual Obligation, Due in Fifth Year	686
Contractual Obligation, Due after Fifth Year	3,416
Contractual Obligation	7,980
Rent expense for power purchase agreements meeting definition of a lease	15	24	19
Maximum percentage of energy sources for which a share of operating costs and debt service is required	5.00%	5.00%	5.00%
Rent expense	16	16	14
Purchased electricity contracts - commercially operable [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	167
Purchase Obligation, Due in Second Year	90
Purchase Obligation, Due in Third Year	65
Purchase Obligation, Due in Fourth Year	61
Purchase Obligation, Due in Fifth Year	58
Purchase Obligation, Due after Fifth Year	292
Purchase Obligation	733
Purchased electricity contracts - non-commercially operable [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	3
Purchase Obligation, Due in Second Year	16
Purchase Obligation, Due in Third Year	64
Purchase Obligation, Due in Fourth Year	65
Purchase Obligation, Due in Fifth Year	65
Purchase Obligation, Due after Fifth Year	1,078
Purchase Obligation	1,291
Fuel contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	789
Purchase Obligation, Due in Second Year	653
Purchase Obligation, Due in Third Year	588
Purchase Obligation, Due in Fourth Year	452
Purchase Obligation, Due in Fifth Year	460
Purchase Obligation, Due after Fifth Year	1,294
Purchase Obligation	4,236
Construction commitments [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	231
Purchase Obligation, Due in Second Year	53
Purchase Obligation, Due in Third Year	12
Purchase Obligation, Due in Fourth Year	8
Purchase Obligation, Due in Fifth Year	2
Purchase Obligation, Due after Fifth Year	8
Purchase Obligation	314
Transmission [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	116
Purchase Obligation, Due in Second Year	112
Purchase Obligation, Due in Third Year	102
Purchase Obligation, Due in Fourth Year	95
Purchase Obligation, Due in Fifth Year	78
Purchase Obligation, Due after Fifth Year	617
Purchase Obligation	1,120
Maintenance, service and other contracts [Member]
Contractual Obligation [Line Items]
Purchase Obligation, Due in Next Twelve Months	49
Purchase Obligation, Due in Second Year	29
Purchase Obligation, Due in Third Year	26
Purchase Obligation, Due in Fourth Year	14
Purchase Obligation, Due in Fifth Year	19
Purchase Obligation, Due after Fifth Year	81
Purchase Obligation	$218

Preferred_Stock_Preferred_Stoc

Preferred Stock Preferred Stock (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
	Payments
Class of Stock [Line Items]
Stock Redeemed or Called During Period, Value		$40
Number of Full Quarterly Dividend Payments in Default Before Preferred Stockholders Elect Board of Directors	4
Preferred Stock Class, Serial Preferred [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	3,500,000	3,500,000
Preferred Stock, Stated Value Per Share	100	$100
Preferred Stock, Shares Issued	24,000	24,000
Preferred Stock, Shares Outstanding	24,000	24,000
Preferred Stock Class, No Par Serial Preferred [Member]
Class of Stock [Line Items]
Preferred Stock, No Par Serial Preferred, Shares Authorized	16,000,000	16,000,000
Preferred Stock, No Par Serial Preferred Stock, Shares Issued	0	0
Preferred Stock, No Par Serial Preferred, Shares Outstanding	0	0
Preferred Stock Class, 5% Preferred [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	127,000	127,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Dividend Rate, Percentage	5.00%	5.00%
Preferred Stock, Shares Outstanding	0	0
Minimum [Member] | Preferred Stock Class, Serial Preferred [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage	6.00%	6.00%
Maximum [Member] | Preferred Stock Class, Serial Preferred [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage	7.00%	7.00%
Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Stock Redeemed or Called During Period, Value		$40

Common_Shareholders_Equity_Com

Common Shareholder's Equity Common Stock Dividends (Details) (USD $)	1 Months Ended	12 Months Ended			1 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 28, 2015
Subsequent Event [Line Items]
Dividends, Common Stock, Cash	$500	$725	$500	$200
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends, Common Stock, Cash					$450

Common_Shareholders_Equity_Reg

Common Shareholder's Equity Regulatory Restrictions on Common Stock Dividends (Details) (USD $)	12 Months Ended
In Billions, unless otherwise specified	Dec. 31, 2014
Regulatory Restrictions on Common Stock Dividends [Abstract]
Minimum common equity to capitalization percentage	44.00%
Percentage of preferred stock to be treated as common equity for common equity percentage calculation	50.00%
Actual common equity percentage as calculated in accordance with acquisition commitment	53.00%
Amount available for dividend distribution without prior approval from regulatory agency	$2.30

Components_of_Accumulated_Othe1

Components of Accumulated Other Comprehensive Loss, Net Components of Accumulated Other Comprehensive Loss, Net (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrecognized amounts on retirement benefits, net of tax	$13	$9

VariableInterest_Entities_Vari

Variable-Interest Entities Variable-Interest Entities (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	66.67%
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets and Liabilities, Net	$192		$178
Variable Interest Entity (VIE) or Potential VIE, Information Unavailability [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Measure of Activity, Purchases	38		38	37
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$0
Jim Bridger Nos. 1-4 [Member]
Variable Interest Entity [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	67.00%
Jim Bridger Nos. 1-4 [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	66.67%
Jointly Owned Utility Plant, Joint Owner Share	33.33%
Share of coal production purchased by Company	66.67%
Share of coal production purchased by joint venture partner	33.33%
Hermiston [Member]
Variable Interest Entity [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	50.00%	[1]
Hermiston [Member] | Variable Interest Entity (VIE) or Potential VIE, Information Unavailability [Member]
Variable Interest Entity [Line Items]
Jointly Owned Utility Plant, Proportionate Ownership Share	50.00%
Percentage of natural gas for jointly owned utility plant procured by Company	100.00%
Percentage of electricity from jointly owned utility plant received by Company	100.00%
Percentage of electricity acquired from jointly owned utility plant by Company through long-term power purchase agreement	50.00%
Jointly Owned Utility Plant, Joint Owner Share	50.00%
[1]	As discussed in Note 17, PacifiCorp has contracted to purchase the remaining 50% of the output of the Hermiston generating facility.

RelatedParty_Transactions_Rela

Related-Party Transactions Related-Party Transactions (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	$10	$17	$15
Due to Affiliate, Current	1	3
Related Party Transaction, Expense Reimbursement	10	9	3
Due from Affiliate, Current	7	2
Subsidiary of Common Parent [Member]
Related Party Transaction [Line Items]
Due to Affiliate, Current	1	0
Related Party Transaction, Purchases from Related Party	7	5	5
Revenue from Related Parties	5	0	0
BNSF Railway Company [Member]
Related Party Transaction [Line Items]
Due to Affiliate, Current	3	2
Related Party Transaction, Purchases from Related Party	39	32	34
MEHC Insurance Services Ltd. [Member]
Related Party Transaction [Line Items]
Due from Affiliate, Current	2	2
Related Party Transaction, Proceeds From Insurance Claims	0	1	6
BHE [Member]
Related Party Transaction [Line Items]
Income Taxes Receivable From (Payable To) Related Parties Current	133	-22
Related Party Transaction, Cash (Paid) Received for Income Taxes, Net	-161	-120	215
Bridger Coal [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Expense Reimbursement	3	2	1
Due from Affiliate, Current	4	4
Equity Method Investee [Member]
Related Party Transaction [Line Items]
Due to Affiliate, Current	19	23
Related Party Transaction, Purchases from Related Party	$146	$152	$144

Supplemental_Cash_Flow_Disclos2

Supplemental Cash Flow Disclosures Supplemental Cash Flow Disclosures (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Accounts payable related to property, plant and equipment additions	$140	$157	$167
Supplemental Cash Flow Information [Abstract]
Interest paid, net of amounts capitalized	340	340	331
Income taxes paid (received), net	$161	$120	($205)