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REVENUE (Tables)
3 Months Ended
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]  
Schedule of Disaggregation of Revenue
The following represents a disaggregation of revenue from contracts with customers for the three months ended March 31, 2024 and 2023:
Three Months Ended March 31,
(In millions)20242023
 Distribution
Retail generation and distribution services
Residential $1,184 $1,171 
Commercial 374 377 
Industrial 146 212 
Other 20 17 
Wholesale 2
Other revenue from contracts with customers21 19
Total revenues from contracts with customers1,746 1,798 
Other revenue unrelated to contracts with customers21 19
Total Distribution$1,767 $1,817 
Integrated
Retail generation and distribution services
Residential$574 $506 
Commercial252 256 
Industrial138 135 
Other
Wholesale30 45
Transmission 81 64
Other revenue from contracts with customers
Total revenues from contracts with customers1,087 1,018 
Other revenue unrelated to contracts with customers10
Total Integrated $1,095 $1,028 
Stand-Alone Transmission
ATSI $243 $226 
TrAIL 67 66 
MAIT 104 89 
KATCo20 15 
Total revenues from contracts with customers434 396 
Other revenue unrelated to contracts with customers
Total Stand-Alone Transmission $438 $400 
Corporate/Other and Reconciling Adjustments(1)
Wholesale$$
Other revenue unrelated to contracts with customers(1)
(16)(16)
Total Corporate/Other and Reconciling $(13)$(14)
FirstEnergy Total Revenues $3,287 $3,231 
(1) Includes eliminations and reconciling adjustments of inter-segment revenues.
Schedule of Receivables from Customers Billed and unbilled customer receivables as of March 31, 2024, and December 31, 2023, are included below:
Customer ReceivablesMarch 31, 2024December 31, 2023
 (In millions)
Billed$833 $717 
Unbilled585 665 
1,418 1,382 
Less: Uncollectible Reserve 53 64 
Total Customer Receivables $1,365 $1,318 
Schedule of Activity in the Allowance for Uncollectible Accounts on Customer Receivables
Activity in the allowance for uncollectible accounts on customer receivables for the three months ended March 31, 2024, and for the year ended December 31, 2023 are as follows:
(In millions)
Balance, January 1, 2023$137 
Provision for expected credit losses(1)
Charged to other accounts(2)
34 
Write-offs(115)
Balance, December 31, 2023$64 
Provision for expected credit losses(1)
12 
Charged to other accounts(2)
Write-offs(32)
Balance, March 31, 2024
$53 
(1) Approximately $3 million and $15 million of which was deferred for future refund in the three months ended March 31, 2024 and the year ended December 31, 2023, respectively.
(2) Represents recoveries and reinstatements of accounts written off for uncollectible accounts.