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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
PacifiCorp [Member]  
Allowance for Doubtful Accounts [Line Items]  
Public Utility Property, Plant, and Equipment (NPC, SPPC, PacifiCorp) [Table Text Block]
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable Life20202019
Utility Plant:
Generation
14 - 67 years
$12,861 $12,509 
Transmission
58 - 75 years
7,632 6,482 
Distribution
20 - 70 years
7,660 7,307 
Intangible plant(1)
5 - 75 years
1,054 1,016 
Other
5 - 60 years
1,510 1,449 
Utility plant in service30,717 28,763 
Accumulated depreciation and amortization(9,838)(9,803)
Utility plant in service, net20,879 18,960 
Other non-regulated, net of accumulated depreciation and amortization
14 - 95 years
9 10 
Plant, net20,888 18,970 
Construction work-in-progress1,542 2,003 
Property, plant and equipment, net$22,430 $20,973 

(1)Computer software costs included in intangible plant are initially assigned a depreciable life of 5 to 10 years.
MidAmerican Energy Company [Member]  
Allowance for Doubtful Accounts [Line Items]  
Public Utility Property, Plant, and Equipment (NPC, SPPC, PacifiCorp) [Table Text Block]
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable Life20202019
Utility plant in service, net:
Generation
20-70 years
$16,980 $15,687 
Transmission
52-75 years
2,365 2,124 
Electric distribution
20-75 years
4,369 4,095 
Natural gas distribution
29-75 years
1,955 1,820 
Utility plant in service25,669 23,726 
Accumulated depreciation and amortization(6,902)(6,139)
Utility plant in service, net18,767 17,587 
Nonregulated property, net:
Nonregulated property gross
20-50 years
7 7 
Accumulated depreciation and amortization(1)(1)
Nonregulated property, net
6 6 
18,773 17,593 
Construction work-in-progress506 782 
Property, plant and equipment, net$19,279 $18,375 
Nevada Power Company [Member]  
Allowance for Doubtful Accounts [Line Items]  
Accounts Receivable, Allowance for Credit Loss The changes in the balance of the allowance for credit losses, which is included in trade receivables, net on the Consolidated Balance Sheets, is summarized as follows for the years ended December 31, (in millions):
202020192018
Beginning balance$15 $16 $16 
Charged to operating costs and expenses, net13 12 15 
Write-offs, net(9)(13)(15)
Ending balance$19 $15 $16 
Public Utility Property, Plant, and Equipment (NPC, SPPC, PacifiCorp) [Table Text Block]
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable Life20202019
Utility plant:
Generation
30 - 55 years
$3,690 $3,541 
Transmission
45 - 70 years
1,468 1,444 
Distribution
20 - 65 years
3,771 3,567 
General and intangible plant
5 - 65 years
791 741 
Utility plant9,720 9,293 
Accumulated depreciation and amortization(3,162)(2,951)
Utility plant, net6,558 6,342 
Other non-regulated, net of accumulated depreciation and amortization
45 years
1 1 
Plant, net6,559 6,343 
Construction work-in-progress142 195 
Property, plant and equipment, net$6,701 $6,538 
Sierra Pacific Power Company [Member]  
Allowance for Doubtful Accounts [Line Items]  
Public Utility Property, Plant, and Equipment (NPC, SPPC, PacifiCorp) [Table Text Block]
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable Life20202019
Utility plant:
Electric generation
25 - 60 years
$1,130 $1,133 
Electric transmission
50 - 100 years
908 840 
Electric distribution
20 - 100 years
1,754 1,669 
Electric general and intangible plant
5 - 70 years
189 178 
Natural gas distribution
35 - 70 years
429 417 
Natural gas general and intangible plant
5 - 70 years
15 14 
Common general
5 - 70 years
355 338 
Utility plant4,780 4,589 
Accumulated depreciation and amortization(1,755)(1,629)
Utility plant, net3,025 2,960 
Other non-regulated, net of accumulated depreciation and amortization
70 years
2 2 
Plant, net3,027 2,962 
Construction work-in-progress137 113 
Property, plant and equipment, net$3,164 $3,075 
Eastern Energy Gas Holdings, LLC [Member]  
Allowance for Doubtful Accounts [Line Items]  
Accounts Receivable, Allowance for Credit Loss The changes in the balance of the allowance for credit losses, which is included in trades receivables, net on the Consolidated Balance Sheets, is summarized as follows for the years ended December 31, (in millions):
202020192018
Beginning balance$2 $— $— 
Charged to operating costs and expenses, net4 2 — 
Write-offs, net(1)— — 
Ending balance$5 $2 $—