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Revenue from Contracts with Customers
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenue from Contracts with Customers
4. Revenue from Contracts with Customers

(All Registrants)

See Note 3 in the Registrants' 2020 Form 10-K for a discussion of the principal activities from which the Registrants and PPL’s segments generate their revenues.

The following tables reconcile "Operating Revenues" included in each Registrant's Statement of Income with revenues generated from contracts with customers for the periods ended September 30.
2021 Three Months
PPLPPL ElectricLG&EKU
Operating Revenues (a)$1,512 $627 $395 $494 
   Revenues derived from:
Alternative revenue programs (b)19 22 (1)(2)
Other (c)(4)— (2)(2)
Revenues from Contracts with Customers$1,527 $649 $392 $490 
2020 Three Months
PPLPPL ElectricLG&EKU
Operating Revenues (a)$1,400 $586 $363 $452 
   Revenues derived from:
Alternative revenue programs (b)(1)(5)2 2 
Other (c)(4)— (2)(2)
Revenues from Contracts with Customers$1,395 $581 $363 $452 
2021 Nine Months
PPLPPL ElectricLG&EKU
Operating Revenues (a)$4,298 $1,769 $1,165 $1,374 
   Revenues derived from:
Alternative revenue programs (b)62 68 (2)(4)
Other (c)(15)— (7)(8)
Revenues from Contracts with Customers$4,345 $1,837 $1,156 $1,362 
2020 Nine Months
PPLPPL ElectricLG&EKU
Operating Revenues (a)$4,103 $1,748 $1,092 $1,272 
   Revenues derived from:
Alternative revenue programs (b)(12)(6)(2)(4)
Other (c)(17)(3)(6)(8)
Revenues from Contracts with Customers$4,074 $1,739 $1,084 $1,260 

(a)PPL Electric represents revenues from external customers reported by the Pennsylvania Regulated segment and LG&E and KU, net of intercompany power sales and transmission revenues, represent revenues from external customers reported by the Kentucky Regulated segment. Kentucky Regulated segment revenues from contracts with customers were $872 million and $2,484 million for the three and nine month periods ended September 30, 2021 and $806 million and $2,311 million for the three and nine month periods ended September 30, 2020. See Note 3 for additional information.
(b)Alternative revenue programs include the transmission formula rate for PPL Electric, the ECR and DSM programs for LG&E and KU, the GLT program and gas supply clause incentive mechanism for LG&E, and the generation formula rate for KU. For PPL Electric, the three months and nine months ended September 30, 2021 include a $13 million and $64 million reserve recorded for a reduction in the transmission formula rate return on equity. See Note 7 for additional information. This line item shows the over/under collection of these rate mechanisms with over-collections of revenue shown as positive amounts in the table above and under-collections shown as negative amounts.
(c)Represents additional revenues outside the scope of revenues from contracts with customers, such as lease and other miscellaneous revenues.

The following tables show revenues from contracts with customers disaggregated by customer class for the periods ended September 30.
2021 Three Months
PPLPPL ElectricLG&EKU
Residential$684 $324 $180 $180 
Commercial345 95 123 127 
Industrial 168 14 46 108 
Other (a)100 13 37 44 
Wholesale - municipality7 — — 7 
Wholesale - other (b)20 — 6 24 
Transmission203 203 — — 
Revenues from Contracts with Customers$1,527 $649 $392 $490 
2020 Three Months
PPLPPL ElectricLG&EKU
Residential$651 $303 $173 $175 
Commercial310 79 112 119 
Industrial 156 13 47 96 
Other (a)86 12 28 38 
Wholesale - municipality7 — — 7 
Wholesale - other (b)11 — 3 17 
Transmission174 174 — — 
Revenues from Contracts with Customers$1,395 $581 $363 $452 
2021 Nine Months
PPLPPL ElectricLG&EKU
Residential$2,025 $964 $529 $532 
Commercial955 260 351 344 
Industrial 474 39 135 300 
Other (a)284 38 102 120 
Wholesale - municipality18 — — 18 
Wholesale - other (b)53 — 39 48 
Transmission536 536 — — 
Revenues from Contracts with Customers$4,345 $1,837 $1,156 $1,362 
2020 Nine Months
PPLPPL ElectricLG&EKU
Residential$1,948 $937 $509 $502 
Commercial896 234 336 326 
Industrial 434 33 130 271 
Other (a)256 38 84 110 
Wholesale - municipality15 — — 15 
Wholesale - other (b)28 — 25 36 
Transmission497 497 — — 
Revenues from Contracts with Customers$4,074 $1,739 $1,084 $1,260 

(a)Primarily includes revenues from pole attachments, street lighting, other public authorities and other non-core businesses.
(b)Includes wholesale power and transmission revenues. LG&E and KU amounts include intercompany power sales and transmission revenues, which are eliminated upon consolidation at the Kentucky Regulated segment.

As discussed in Note 2 in PPL's 2020 Form 10-K, PPL segments its business by geographic location. Revenues from external customers for each segment/geographic location are reconciled to revenues from contracts with customers in the footnotes to the tables above.

Contract receivables from customers are primarily included in "Accounts receivable - Customer", "Unbilled revenues", and "Other noncurrent assets" on the Balance Sheets.

The following table shows the accounts receivable and unbilled revenues balances that were impaired for the periods ended September 30.
Three MonthsNine Months
2021202020212020
PPL$7 $7 $9 $19 
PPL Electric3 3 4 12 
LG&E1 3 1 4 
KU3 1 4 3 

The following table shows the balances and certain activity of contract liabilities resulting from contracts with customers.
PPLPPL ElectricLG&EKU
Contract liabilities at December 31, 2020
$40 $23 $5 $6 
Contract liabilities at September 30, 2021
37 21 6 6 
Revenue recognized during the nine months ended September 30, 2021 that was included in the contract liability balance at December 31, 2020
24 11 5 6 
Contract liabilities at December 31, 2019
$37 $21 $5 $4 
Contract liabilities at September 30, 2020
32 18 5 4 
Revenue recognized during the nine months ended September 30, 2020 that was included in the contract liability balance at December 31, 2019
21 9 5 4 

Contract liabilities result from recording contractual billings in advance for customer attachments to the Registrants' infrastructure and payments received in excess of revenues earned to date. Advanced billings for customer attachments are recognized as revenue ratably over the billing period. Payments received in excess of revenues earned to date are recognized as revenue as services are delivered in subsequent periods.

At September 30, 2021, PPL had $48 million of performance obligations attributable to Corporate and Other that have not been satisfied. Of this amount, PPL expects to recognize approximately $42 million within the next 12 months.