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Property, Plant and Equipment, Net (Notes)
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Net [Text Block] Property, Plant and Equipment, Net
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable
Life20202019
Regulated assets:
Utility generation, transmission and distribution systems
5-80 years
$86,730 $81,127 
Interstate natural gas pipeline assets
3-80 years
16,667 8,165 
103,397 89,292 
Accumulated depreciation and amortization(30,662)(26,353)
Regulated assets, net72,735 62,939 
Nonregulated assets:
Independent power plants
5-30 years
7,012 6,983 
Other assets
3-40 years
5,659 1,834 
12,671 8,817 
Accumulated depreciation and amortization(2,586)(2,183)
Nonregulated assets, net10,085 6,634 
Net operating assets82,820 69,573 
Construction work-in-progress3,308 3,732 
Property, plant and equipment, net$86,128 $73,305 

Construction work-in-progress includes $3.2 billion and $3.6 billion as of December 31, 2020 and 2019, respectively, related to the construction of regulated assets.
MidAmerican Funding, LLC and Subsidiaries [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Net [Text Block] Refer to Note 3 of MidAmerican Energy's Notes to Financial Statements. In addition to MidAmerican Energy's property, plant and equipment, net, MidAmerican Funding had nonregulated property gross of $— million and $3 million as of December 31, 2020 and 2019, respectively, and related accumulated depreciation and amortization of $— million and $1 million as of December 31, 2020 and 2019, respectively.
MidAmerican Energy Company [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Net [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 

Nonregulated property, net consists primarily of land not recoverable for regulated utility purposes.

The average depreciation and amortization rates applied to depreciable utility plant for the years ended December 31 were as follows:
202020192018
Electric3.2 %3.1 %2.9 %
Natural gas2.8 %2.8 %2.8 %
Nevada Power Company [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Net [Text Block] Property, Plant and Equipment, Net
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 

Almost all of Nevada Power's plant is subject to the ratemaking jurisdiction of the PUCN and the FERC. Nevada Power's depreciation and amortization expense, as authorized by the PUCN, stated as a percentage of the depreciable property balances as of December 31, 2020, 2019 and 2018 was 3.1%, 3.3%, and 3.2%, respectively. Nevada Power is required to file a utility plant depreciation study every six years as a companion filing with the triennial general rate review filings. The most recent study was filed in 2017.

Construction work-in-progress is primarily related to the construction of regulated assets.
Sierra Pacific Power Company [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Net [Text Block] Property, Plant and Equipment, Net
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 
All of Sierra Pacific's plant is subject to the ratemaking jurisdiction of the PUCN and the FERC. Sierra Pacific's depreciation and amortization expense, as authorized by the PUCN, stated as a percentage of the depreciable property balances as of December 31, 2020, 2019 and 2018 was 3.2%, 3.1% and 3.1%, respectively. Sierra Pacific is required to file a utility plant depreciation study every six years as a companion filing with the triennial general rate review filings. The most recent study was filed in 2016.

Construction work-in-progress is primarily related to the construction of regulated assets.
Eastern Energy Gas Holdings, LLC [Member]  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Net [Text Block] Property, Plant and Equipment, Net
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable Life20202019
Utility Plant:
Interstate natural gas pipeline assets
24 - 43 years
$8,382 $10,025 
Intangible plant
5 - 10 years
115 143 
Utility plant in service8,497 10,168 
Accumulated depreciation and amortization(2,759)(3,414)
Utility plant in service, net5,738 6,754 
Nonutility Plant:
LNG facility40 years4,454 4,425 
Intangible plant14 years25 25 
Nonutility plant in service4,479 4,450 
Accumulated depreciation and amortization(283)(196)
Nonutility plant in service, net4,196 4,254 
Plant, net9,934 11,008 
Construction work- in-progress210 719 
Property, plant and equipment, net$10,144 $11,727 

Construction work-in-progress includes $196 million and $584 million as of December 31, 2020 and 2019, respectively, related to the construction of utility plant.

EGP Gathering and Processing Assets

In the fourth quarter of 2018, Eastern Energy Gas conducted a review of strategic alternatives of its remaining gathering and processing assets at EGP. Based on an evaluation of EGP's long-lived assets for recoverability under a probability weighted approach, Eastern Energy Gas determined the assets were impaired. As a result of this evaluation, Eastern Energy Gas recorded a charge of $219 million ($165 million after-tax) in discontinued operations in its Consolidated Statement of Operations to write-down EGP's property, plant and equipment to its estimated fair value of $190 million. The fair value of the property, plant and equipment was estimated using an income approach and market approach. The valuation is considered a Level 3 fair value measurement due to the use of significant judgmental and unobservable inputs, including projected timing and amount of future cash flows and discount rates reflecting risks inherent in the future cash flows and market prices.

Assignments of Shale Development Rights

In December 2013, Eastern Energy Gas closed on agreements with two natural gas producers to convey over time approximately 100,000 acres of Marcellus Shale development rights underneath several of its natural gas storage fields. The agreements provided for payments to Eastern Energy Gas, subject to customary adjustments, of approximately $200 million over a period of nine years, and an overriding royalty interest in gas produced from the acreage. In August 2017, Eastern Energy Gas and the natural gas producer signed an amendment to the agreement, which included the finalization of contractual matters on previous conveyances, the conveyance of Eastern Energy Gas' remaining 68% interest in approximately 70,000 acres and the elimination of Eastern Energy Gas' overriding royalty interest in gas produced from all acreage. Eastern Energy Gas received consideration of $65 million in September 2018 in connection with the final conveyance. As a result of this amendment, Eastern Energy Gas recognized in 2018 a $65 million ($47 million after-tax) gain included in operations and maintenance expense in the Consolidated Statement of Operations associated with the final conveyance of acreage.
In November 2014, Eastern Energy Gas closed an agreement with a natural gas producer to convey over time approximately 24,000 acres of Marcellus Shale development rights underneath one of its natural gas storage fields. The agreement provided for payments to Eastern Energy Gas, subject to customary adjustments, of approximately $120 million over a period of four years, and an overriding royalty interest in gas produced from the acreage. In January 2018, Eastern Energy Gas and the natural gas producer closed on an amendment to the agreement, which included the conveyance of Eastern Energy Gas' remaining 50% interest in approximately 18,000 acres and the elimination of Eastern Energy Gas' overriding royalty interest in gas produced from all acreage. Eastern Energy Gas received proceeds of $28 million, resulting in an approximately $28 million ($20 million after-tax) gain recorded in operations and maintenance expense in the Consolidated Statement of Operations.

In March 2018, Eastern Energy Gas closed an agreement with a natural gas producer to convey approximately 11,000 acres of Utica and Point Pleasant Shale development rights underneath one of its natural gas storage fields. The agreement provided for a payment to Eastern Energy Gas, subject to customary adjustments, of $16 million. In March 2018, Eastern Energy Gas received cash proceeds of $16 million associated with the conveyance of the acreage, resulting in a $16 million ($12 million after-tax) gain recorded in operations and maintenance expense in the Consolidated Statement of Operations.

In June 2018, Eastern Energy Gas closed an amendment to an agreement with a natural gas producer for the elimination of Eastern Energy Gas' overriding royalty interest in gas produced from approximately 9,000 acres of Marcellus Shale development rights underneath one of its natural gas storage fields previously conveyed in December 2013. In June 2018, Eastern Energy Gas received proceeds of $6 million associated with the transaction, resulting in a $6 million ($4 million after-tax) gain recorded in operations and maintenance expense in the Consolidated Statement of Operations.