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Revenue from Contracts with Customers Revenue from Contracts with Customers - SPPC - Customer Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 3,317 $ 3,429 $ 6,833 $ 7,116
Operating revenue 4,612 4,894 9,139 9,504
Non-contracts with customer revenue [Member]        
Disaggregation of Revenue [Line Items]        
Operating revenue 102 138 220 276
Regulated Operation [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 2,969 3,063 6,182 6,470
Regulated Operation [Member] | Regulated retail electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 2,172 2,232 4,233 4,388
Regulated Operation [Member] | Regulated retail gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 104 116 338 413
Sierra Pacific Power Company [Member]        
Disaggregation of Revenue [Line Items]        
Operating revenue 185 194 417 413
Sierra Pacific Power Company [Member] | Non-contracts with customer revenue [Member]        
Disaggregation of Revenue [Line Items]        
Operating revenue 1 2 3 3
Sierra Pacific Power Company [Member] | Regulated Electric [Member]        
Disaggregation of Revenue [Line Items]        
Operating revenue 165 172 349 354
Sierra Pacific Power Company [Member] | Regulated Electric [Member] | Non-contracts with customer revenue [Member]        
Disaggregation of Revenue [Line Items]        
Operating revenue 1 1 2 2
Sierra Pacific Power Company [Member] | Regulated Gas [Member]        
Disaggregation of Revenue [Line Items]        
Operating revenue 20 22 68 59
Sierra Pacific Power Company [Member] | Regulated Gas [Member] | Non-contracts with customer revenue [Member]        
Disaggregation of Revenue [Line Items]        
Operating revenue 0 1 1 1
Sierra Pacific Power Company [Member] | Regulated Operation [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 184 192 414 410
Sierra Pacific 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 9 11 24 28
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Regulated Electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 164 171 347 352
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Regulated Electric [Member] | Regulated wholesale, transmission and other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 9 11 24 28
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Regulated Gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 20 21 67 58
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Regulated Gas [Member] | Regulated wholesale, transmission and other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 0 0
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 174 180 388 380
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 77 72 176 164
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 60 59 129 123
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 36 48 81 90
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1 1 2 3
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Regulated Electric [Member] | Regulated retail electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 154 159 321 322
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Regulated Electric [Member] | Regulated retail electric [Member] | Residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 63 58 132 126
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Regulated Electric [Member] | Regulated retail electric [Member] | Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 56 54 112 108
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Regulated Electric [Member] | Regulated retail electric [Member] | Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 34 46 75 85
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Regulated Electric [Member] | Regulated retail electric [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1 1 2 3
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Regulated Gas [Member] | Regulated retail gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 20 21 67 58
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Regulated Gas [Member] | Regulated retail gas [Member] | Residential [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 14 14 44 38
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Regulated Gas [Member] | Regulated retail gas [Member] | Commercial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 4 5 17 15
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Regulated Gas [Member] | Regulated retail gas [Member] | Industrial [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 2 2 6 5
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled customer [Member] | Regulated Gas [Member] | Regulated retail gas [Member] | Other [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 0 0
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Distribution only service [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1 1 2 2
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Distribution only service [Member] | Regulated Electric [Member] | Regulated retail electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 1 1 2 2
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Distribution only service [Member] | Regulated Gas [Member] | Regulated retail gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 0 0
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled and distribution services only customer [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 175 181 390 382
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled and distribution services only customer [Member] | Regulated Electric [Member] | Regulated retail electric [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 155 160 323 324
Sierra Pacific Power Company [Member] | Regulated Operation [Member] | Fully bundled and distribution services only customer [Member] | Regulated Gas [Member] | Regulated retail gas [Member]        
Disaggregation of Revenue [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 20 $ 21 $ 67 $ 58