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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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Revenue from Contracts with Customers Revenue from Contracts with Customers - PAC - Customer Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 4,270		$ 11,358
Unbilled Contracts Receivable	624		624		$ 665
Operating revenue	5,637	$ 5,283	15,070	$ 14,003
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	149		460
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	3,844		10,297
Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,971		7,303
Regulated Operation [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	80		306
Regulated Operation [Member] \| Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	439		1,385
Regulated Operation [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	0		1
PacifiCorp [Member]
Disaggregation of Revenue [Line Items]
Allowance for Doubtful Accounts Receivable	673		673		635
Unbilled Contracts Receivable	229		229		$ 255
Operating revenue	1,369	$ 1,430	3,746	$ 3,956
PacifiCorp [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	26		109
PacifiCorp [Member] \| Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,343		3,637
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	1,307		3,479
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	478		1,284
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	418		1,129
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	305		862
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	106		204
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	(10)		21
PacifiCorp [Member] \| Regulated Operation [Member] \| Regulated transmission and distribution [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	30		82
PacifiCorp [Member] \| Regulated Operation [Member] \| Other customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 16		$ 55