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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2021
Revenue from contracts with customers [Line Items]  
Reconciliation of revenue from contracts with customers [Table Text Block]
The following table reconciles "Operating Revenues" included in each Registrant's Statement of Income with revenues generated from contracts with customers for the years ended December 31:
2021
PPLPPL ElectricLG&EKU
Operating Revenues (a)$5,783 $2,402 $1,569 $1,826 
Revenues derived from:
Alternative revenue programs (b)77 83 (3)(3)
Other (c)(22)(3)(8)(9)
Revenues from Contracts with Customers$5,838 $2,482 $1,558 $1,814 
2020
PPLPPL ElectricLG&EKU
Operating Revenues (a)$5,474 $2,331 $1,456 $1,690 
Revenues derived from:
Alternative revenue programs (b)(24)(12)(8)(4)
Other (c)(21)(3)(7)(10)
Revenues from Contracts with Customers$5,429 $2,316 $1,441 $1,676 
2019
PPLPPL ElectricLG&EKU
Operating Revenues (a)$5,602 $2,358 $1,500 $1,740 
Revenues derived from:
Alternative revenue programs (b)(30)(6)(10)(14)
Other (c)(31)(10)(9)(12)
Revenues from Contracts with Customers$5,541 $2,342 $1,481 $1,714 

(a)Amounts for PPL Electric represent revenues from external customers reported by the Pennsylvania Regulated segment and amounts for LG&E and KU, net of intercompany power sales and transmission revenues, represent revenues from external customers reported by the Kentucky Regulated segment. See Note 2 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 and GSC programs for LG&E, and the generation formula rate for KU. For PPL Electric, revenue in 2021 was reduced by $78 million 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 leases and other miscellaneous revenues.
Disaggregation of Revenue [Table Text Block]
The following table shows revenues from contracts with customers disaggregated by customer class for the years ended December 31:
2021
ResidentialCommercialIndustrialOther (a)Wholesale - municipalityWholesale - other (b)TransmissionRevenues from Contracts with Customers
PPL
PA Regulated$1,299 $350 $53 $50 $— $— $730 $2,482 
KY Regulated1,416 928 586 305 24 66 — 3,325 
Corp and Other— — — 31 — — — 31 
Total PPL$2,715 $1,278 $639 $386 $24 $66 $730 $5,838 
PPL Electric$1,299 $350 $53 $50 $— $— $730 $2,482 
LG&E$711 $473 $180 $145 $— $49 $— $1,558 
KU$705 $455 $406 $160 $24 $64 $— $1,814 
2020
ResidentialCommercialIndustrialOther (a)Wholesale - municipalityWholesale - other (b)TransmissionRevenues from Contracts with Customers
PPL
PA Regulated$1,238 $314 $44 $50 $— $— $670 $2,316 
KY Regulated1,347 871 538 261 20 40 — 3,077 
Corp and Other— — — 36 — — — 36 
Total PPL$2,585 $1,185 $582 $347 $20 $40 $670 $5,429 
PPL Electric $1,238 $314 $44 $50 $— $— $670 $2,316 
LG&E$676 $444 $173 $114 $— $34 $— $1,441 
KU$671 $427 $365 $147 $20 $46 $— $1,676 

2019
ResidentialCommercialIndustrialOther (a)Wholesale - municipalityWholesale - other (b)TransmissionRevenues from Contracts with Customers
PPL
PA Regulated$1,288 $349 $59 $52 $— $— $594 $2,342 
KY Regulated1,322 908 562 277 43 49 — 3,161 
Corp and Other— — — 38 — — — 38 
Total PPL$2,610 $1,257 $621 $367 $43 $49 $594 $5,541 
PPL Electric $1,288 $349 $59 $52 $— $— $594 $2,342 
LG&E$668 $466 $180 $121 $— $46 $— $1,481 
KU$654 $442 $382 $156 $43 $37 $— $1,714 

(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 PPL.
Credit loss recognized from contract with customer [Table Text Block]
The following table shows the accounts receivable and unbilled revenues balances that were impaired for the year ended December 31:
202120202019
PPL$22 $25 $27 
PPL Electric10 17 21 
LG&E4 4 2 
KU8 4 4 
Contract with Customer, Asset and Liability [Table Text Block]
The following table shows the balances and certain activity of contract liabilities resulting from contracts with customers:
PPLPPL ElectricLG&EKU
Contract liabilities as of December 31, 2021$42 $25 $6 $6 
Contract liabilities as of December 31, 202040 23 5 6 
Revenue recognized during the year ended December 31, 2021 that was included in the contract liability balance at December 31, 202024 11 5 6 
Contract liabilities as of December 31, 2020$40 $23 $5 $6 
Contract liabilities as of December 31, 201937 21 5 4 
Revenue recognized during the year ended December 31, 2020 that was included in the contract liability balance at December 31, 201922 9 5 4 
Contract liabilities as of December 31, 2019$37 $21 $5 $4 
Contract liabilities as of December 31, 201840 23 5 4 
Revenue recognized during the year ended December 31, 2019 that was included in the contract liability balance at December 31, 201825 11 5 4