Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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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 - NPC - 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]
Unbilled Contracts Receivable	$ 624		$ 624		$ 665
Revenue from Contract with Customer, Excluding Assessed Tax	4,270		11,358
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
Nevada Power Company [Member]
Disaggregation of Revenue [Line Items]
Unbilled Contracts Receivable	178		178		$ 111
Operating revenue	820	$ 819	1,777	$ 1,785
Nevada Power Company [Member] \| Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Operating revenue	6		17
Nevada Power Company [Member] \| Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	814		1,760
Nevada Power Company [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	799		1,722
Nevada Power Company [Member] \| Regulated Operation [Member] \| Regulated wholesale, transmission and other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	15		38
Nevada Power Company [Member] \| Fully bundled customer [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	790		1,698
Nevada Power Company [Member] \| Fully bundled customer [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Residential [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	484		989
Nevada Power Company [Member] \| Fully bundled customer [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Commercial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	135		340
Nevada Power Company [Member] \| Fully bundled customer [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	164		351
Nevada Power Company [Member] \| Fully bundled customer [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member] \| Other [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	7		18
Nevada Power Company [Member] \| Distribution only service [Member] \| Regulated Operation [Member] \| Regulated retail electric [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 9		$ 24