Revenue from Contract with Customer Revenue from Contract with Customer - NPC (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		$ 14,972
Revenues		19,787	$ 18,614	$ 17,422
Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		13,612
Regulated retail electric [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		9,419
Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues	[1]	601
Nevada Power Company [Member]
Disaggregation of Revenue [Line Items]
Revenues		2,184	$ 2,206	$ 2,083
Nevada Power Company [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2,160
Nevada Power Company [Member] | Regulated retail electric [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		2,107
Nevada Power Company [Member] | Regulated wholesale, transmission and other [Member] | Regulated Operation [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		53
Nevada Power Company [Member] | Non-contracts with customer revenue [Member]
Disaggregation of Revenue [Line Items]
Revenues		$ 24

[1] (2)Includes net payments to counterparties for the financial settlement of certain derivative contracts at BHE Pipeline Group.