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REVENUE
 6 Months Ended
Jun. 30, 2024
Revenue from Contract with Customer [Abstract]  
REVENUE REVENUE
The following represents a disaggregation of revenue from contracts with customers for the three and six months ended June 30, 2024 and 2023:
Three Months Ended June 30,Six Months Ended June 30,
(In millions)2024202320242023
 Distribution
Retail generation and distribution services
Residential $1,054 $967 $2,238 $2,138 
Commercial 384 374 758 751 
Industrial 153 213 299 425 
Other 18 17 38 34 
Wholesale 1 112 13
Other revenue from contracts with customers19 2740 46
Total revenues from contracts with customers1,629 1,609 3,375 3,407 
Other revenue unrelated to contracts with customers19 1840 37
Total Distribution$1,648 $1,627 $3,415 $3,444 
Integrated
Retail generation and distribution services
Residential$578 $423 $1,152 $929 
Commercial276 240 528 496 
Industrial147 133 285 268 
Other7 8 14 14 
Wholesale38 5068 95
Transmission 116 86197 150
Other revenue from contracts with customers8 6 13 12 
Total revenues from contracts with customers1,170 946 2,257 1,964 
Other revenue unrelated to contracts with customers8 1016 20
Total Integrated $1,178 $956 $2,273 $1,984 
Stand-Alone Transmission
ATSI $261 $241 $504 $467 
TrAIL 71 66 138 132 
MAIT 110 98 214 187 
KATCo23 27 43 42 
Other (2)$— (2)— 
Total revenues from contracts with customers463 432 897 828 
Other revenue unrelated to contracts with customers5 4 9 8 
Total Stand-Alone Transmission $468 $436 $906 $836 
Corporate/Other, Eliminations and Reconciling Adjustments
Wholesale$1 $3 $4 $5 
Eliminations and reconciling adjustments (15)(16)(31)(32)
Total Corporate/Other, Eliminations and Reconciling Adjustments$(14)$(13)$(27)$(27)
FirstEnergy Total Revenues $3,280 $3,006 $6,567 $6,237 
Customer Receivables

Receivables from contracts with customers include distribution services and retail generation sales to residential, commercial and industrial customers of the Electric Companies. Billed and unbilled customer receivables as of June 30, 2024, and December 31, 2023, are included below:
Customer ReceivablesJune 30, 2024December 31, 2023
 (In millions)
Billed$816 $717 
Unbilled741 665 
1,557 1,382 
Less: Uncollectible Reserve 54 64 
Total Customer Receivables $1,503 $1,318 
The allowance for uncollectible customer receivables is based on historical loss information comprised of a rolling 36-month average net write-off percentage of revenues, in conjunction with a qualitative assessment of elements that impact the collectability of receivables to determine if allowances for uncollectible customer receivables should be further adjusted in accordance with the accounting guidance for credit losses.

FirstEnergy reviews its allowance for uncollectible customer receivables utilizing a quantitative and qualitative assessment. Management contemplates available current information such as changes in economic factors, regulatory matters, industry trends, customer credit factors, amount of receivable balances that are past-due, payment options and programs available to customers, and the methods that the Electric Companies are able to utilize to ensure payment. FirstEnergy’s uncollectible risk on PJM receivables, resulting from transmission and wholesale sales, is minimal due to the nature of PJM’s settlement process and as a result there is no current allowance for doubtful accounts.

Activity in the allowance for uncollectible accounts on customer receivables for the six months ended June 30, 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)
8 
Charged to other accounts(2)
34 
Write-offs(115)
Balance, December 31, 2023$64 
Provision for expected credit losses(1)
32 
Charged to other accounts(2)
17 
Write-offs(59)
Balance, June 30, 2024
$54 
(1) Approximately $2 million and $(15) million of which was deferred for future recovery (refund) in the six months ended June 30, 2024 and the year ended December 31, 2023, respectively.
(2) Represents recoveries and reinstatements of accounts written off for uncollectible accounts.