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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2021
Allowance for Doubtful Accounts [Line Items]  
Schedule of Allowance for Credit Loss The change 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):
202120202019
Beginning balance$77 $44 $42 
Charged to operating costs and expenses, net81 56 47 
Acquisitions— 5 — 
Write-offs, net(50)(28)(45)
Ending balance$108 $77 $44 
PAC  
Allowance for Doubtful Accounts [Line Items]  
Schedule of Allowance for Credit Loss The change 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):
202120202019
Beginning balance$17 $8 $8 
Charged to operating costs and expenses, net13 18 13 
Write-offs, net(12)(9)(13)
Ending balance$18 $17 $8 
Schedule of Public Utility Property, Plant, and Equipment
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable Life20212020
Utility Plant:
Generation
15 - 59 years
$13,679 $12,861 
Transmission
60 - 90 years
7,894 7,632 
Distribution
20 - 75 years
8,044 7,660 
Intangible plant(1)
5 - 75 years
1,106 1,054 
Other
5 - 60 years
1,539 1,510 
Utility plant in-service32,262 30,717 
Accumulated depreciation and amortization(10,507)(9,838)
Utility plant in-service, net21,755 20,879 
Other non-regulated, net of accumulated depreciation and amortization
14 - 95 years
18 9 
Plant, net21,773 20,888 
Construction work-in-progress1,141 1,542 
Property, plant and equipment, net$22,914 $22,430 

(1)Computer software costs included in intangible plant are initially assigned a depreciable life of 5 to 10 years.
MEC  
Allowance for Doubtful Accounts [Line Items]  
Schedule of Allowance for Credit Loss The change in the balance of the allowance for credit losses, which is included in trade receivables, net on the Balance Sheets, is summarized as follows for the years ended December 31 (in millions):
202120202019
Beginning balance$12 $5 $7 
Charged to operating costs and expenses, net10 12 9 
Write-offs, net(10)(5)(11)
Ending balance$12 $12 $5 
Schedule of Public Utility Property, Plant, and Equipment
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable Life20212020
Utility plant in-service, net:
Generation
20-70 years
$17,397 $16,980 
Transmission
52-75 years
2,474 2,365 
Electric distribution
20-75 years
4,661 4,369 
Natural gas distribution
29-75 years
2,039 1,955 
Utility plant in-service26,571 25,669 
Accumulated depreciation and amortization(7,376)(6,902)
Utility plant in-service, net19,195 18,767 
Nonregulated property, net:
Nonregulated property gross
20-50 years
7 7 
Accumulated depreciation and amortization(1)(1)
Nonregulated property, net
6 6 
19,201 18,773 
Construction work-in-progress1,100 506 
Property, plant and equipment, net$20,301 $19,279 
NPC  
Allowance for Doubtful Accounts [Line Items]  
Schedule of 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):
202120202019
Beginning balance$19 $15 $16 
Charged to operating costs and expenses, net13 13 12 
Write-offs, net(14)(9)(13)
Ending balance$18 $19 $15 
Schedule of Public Utility Property, Plant, and Equipment
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable Life20212020
Utility plant:
Generation
30 - 55 years
$3,793 $3,690 
Transmission
45 - 70 years
1,503 1,468 
Distribution
20 - 65 years
3,920 3,771 
General and intangible plant
5 - 65 years
836 791 
Utility plant10,052 9,720 
Accumulated depreciation and amortization(3,406)(3,162)
Utility plant, net6,646 6,558 
Other non-regulated, net of accumulated depreciation and amortization
45 years
1 1 
Plant, net6,647 6,559 
Construction work-in-progress244 142 
Property, plant and equipment, net$6,891 $6,701 
SPPC  
Allowance for Doubtful Accounts [Line Items]  
Schedule of 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):
202120202019
Beginning balance$2 $2 $2 
Charged to operating costs and expenses, net2 2 1 
Write-offs, net(3)(2)(1)
Ending balance$1 $2 $2 
Schedule of Public Utility Property, Plant, and Equipment
Property, plant and equipment, net consists of the following as of December 31 (in millions):
Depreciable Life20212020
Utility plant:
Electric generation
25 - 60 years
$1,163 $1,130 
Electric transmission
50 - 100 years
940 908 
Electric distribution
20 - 100 years
1,846 1,754 
Electric general and intangible plant
5 - 70 years
204 189 
Natural gas distribution
35 - 70 years
438 429 
Natural gas general and intangible plant
5 - 70 years
14 15 
Common general
5 - 70 years
370 355 
Utility plant4,975 4,780 
Accumulated depreciation and amortization(1,854)(1,755)
Utility plant, net3,121 3,025 
Other non-regulated, net of accumulated depreciation and amortization
70 years
— 2 
Plant, net3,121 3,027 
Construction work-in-progress219 137 
Property, plant and equipment, net$3,340 $3,164 
EEGH  
Allowance for Doubtful Accounts [Line Items]  
Schedule of 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):
202120202019
Beginning balance$5 $2 $— 
Charged to operating costs and expenses, net1 4 2 
Write-offs, net— (1)— 
Ending balance$6 $5 $2