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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2020
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:
2020
PPLPPL ElectricLKELG&EKU
Operating Revenues (a)$7,607 $2,331 $3,106 $1,456 $1,690 
Revenues derived from:
Alternative revenue programs (b)(24)(12)(12)(8)(4)
Other (c)(27)(3)(17)(7)(10)
Revenues from Contracts with Customers$7,556 $2,316 $3,077 $1,441 $1,676 
2019
PPLPPL ElectricLKELG&EKU
Operating Revenues (a)$7,769 $2,358 $3,206 $1,500 $1,740 
Revenues derived from:
Alternative revenue programs (b)(30)(6)(24)(10)(14)
Other (c)(38)(10)(21)(9)(12)
Revenues from Contracts with Customers$7,701 $2,342 $3,161 $1,481 $1,714 
2018
PPLPPL ElectricLKELG&EKU
Operating Revenues (a)$7,785 $2,277 $3,214 $1,496 $1,760 
Revenues derived from:
Alternative revenue programs (b)32 (6)38 12 26 
Other (c)(38)(12)(17)(5)(12)
Revenues from Contracts with Customers$7,779 $2,259 $3,235 $1,503 $1,774 

(a)For the years ended December 31, 2020 and 2019, PPL includes $2.1 billion and $2.2 billion of revenues from external customers reported by the U.K. Regulated segment. PPL Electric and LKE represent revenues from external customers reported by the Pennsylvania Regulated and Kentucky Regulated segments. 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 program for LG&E, and the generation formula rate for KU. 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:
2020
PPL (d)PPL Electric (d)LKELG&EKU
Licensed energy suppliers (a)$1,990 $— $— $— $— 
Residential2,585 1,238 1,347 676 671 
Commercial1,185 314 871 444 427 
Industrial582 44 538 173 365 
Other (b)484 50 261 114 147 
Wholesale - municipal20 — 20 — 20 
Wholesale - other (c)40 — 40 34 46 
Transmission670 670 — — — 
Revenues from Contracts with Customers$7,556 $2,316 $3,077 $1,441 $1,676 
2019
PPL (d)PPL Electric (d)LKELG&EKU
Licensed energy suppliers (a)$2,032 $— $— $— $— 
Residential2,610 1,288 1,322 668 654 
Commercial1,257 349 908 466 442 
Industrial621 59 562 180 382 
Other (b)495 52 277 121 156 
Wholesale - municipal43 — 43 — 43 
Wholesale - other (c)49 — 49 46 37 
Transmission594 594 — — — 
Revenues from Contracts with Customers$7,701 $2,342 $3,161 $1,481 $1,714 
2018
PPLPPL Electric LKELG&EKU
Licensed energy suppliers (a)$2,127 $— $— $— $— 
Residential2,704 1,379 1,325 666 659 
Commercial1,233 368 865 455 410 
Industrial624 54 570 180 390 
Other (b)489 53 278 129 149 
Wholesale - municipal118 — 118 — 118 
Wholesale - other (c)79 — 79 73 48 
Transmission405 405 — — — 
Revenues from Contracts with Customers$7,779 $2,259 $3,235 $1,503 $1,774 

(a)Represents customers of WPD.
(b)Primarily includes revenues from pole attachments, street lighting, other public authorities and other non-core businesses.
(c)Includes wholesale power and transmission revenues. LG&E and KU amounts include intercompany power sales and transmission revenues, which are eliminated upon consolidation at LKE.
(d)In 2020 and 2019, management deemed it appropriate to present the revenue offset associated with network integration transmission service (NITS) as distribution revenue rather than transmission revenue.
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:
202020192018
PPL$29 $27 $34 
PPL Electric17 21 24 
LKE8 6 9 
LG&E4 2 4 
KU4 4 5 
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 ElectricLKELG&EKU
Contract liabilities as of December 31, 2020$48 $23 $11 $5 $6 
Contract liabilities as of December 31, 201944 21 9 5 4 
Revenue recognized during the year ended December 31, 2020 that was included in the contract liability balance at December 31, 201929 9 9 5 4 
Contract liabilities as of December 31, 2019$44 $21 $9 $5 $4 
Contract liabilities as of December 31, 201842 23 9 5 4 
Revenue recognized during the year ended December 31, 2019 that was included in the contract liability balance at December 31, 201832 11 9 5 4 
Contract liabilities as of December 31, 2018$42 $23 $9 $5 $4 
Contract liabilities as of December 31, 201729 19 8 4 4 
Revenue recognized during the year ended December 31, 2018 that was included in the contract liability balance at December 31, 201721 8 8 4 4