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Revenue from Contracts with Customers (Tables)
 9 Months Ended
Sep. 30, 2020
Revenue from Contracts with Customers [Line Items]  
Reconciliation of Revenue from Contracts with Customers [Table Text Block]
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.
2020 Three Months
PPLPPL ElectricLKELG&EKU
Operating Revenues (a)$1,885 $586 $806 $363 $452 
   Revenues derived from:
Alternative revenue programs (b)(1)(5)4 2 2 
Other (c)(5)— (4)(2)(2)
Revenues from Contracts with Customers$1,879 $581 $806 $363 $452 
2019 Three Months
PPLPPL ElectricLKELG&EKU
Operating Revenues (a)$1,933 $590 $844 $382 $466 
   Revenues derived from:
Alternative revenue programs (b)8 2 6 4 2 
Other (c)(11)(3)(6)(3)(3)
Revenues from Contracts with Customers$1,930 $589 $844 $383 $465 

2020 Nine Months
PPLPPL ElectricLKELG&EKU
Operating Revenues (a)$5,678 $1,748 $2,331 $1,092 $1,272 
   Revenues derived from:
Alternative revenue programs (b)(12)(6)(6)(2)(4)
Other (c)(22)(3)(14)(6)(8)
Revenues from Contracts with Customers$5,644 $1,739 $2,311 $1,084 $1,260 
2019 Nine Months
PPLPPL ElectricLKELG&EKU
Operating Revenues (a)$5,815 $1,756 $2,421 $1,126 $1,322 
   Revenues derived from:
Alternative revenue programs (b)(18)(4)(14)(1)(13)
Other (c)(30)(8)(16)(7)(9)
Revenues from Contracts with Customers$5,767 $1,744 $2,391 $1,118 $1,300 

(a)PPL includes $485 million and $1,575 million for the three and nine months ended September 30, 2020 and $491 million and $1,615 million for the three and nine months ended September 30, 2019 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 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 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 lease and other miscellaneous revenues.
Disaggregation of Revenue [Table Text Block]
The following tables show revenues from contracts with customers disaggregated by customer class for the periods ended September 30.
2020 Three Months
PPL (d)PPL Electric (d)LKELG&EKU
Licensed energy suppliers (a)$440 $— $— $— $— 
Residential651 303 348 173 175 
Commercial310 79 231 112 119 
Industrial 156 13 143 47 96 
Other (b)130 12 66 28 38 
Wholesale - municipality7 — 7 — 7 
Wholesale - other (c)11 — 11 3 17 
Transmission174 174 — — — 
Revenues from Contracts with Customers$1,879 $581 $806 $363 $452 
2019 Three Months
PPLPPL ElectricLKELG&EKU
Licensed energy suppliers (a)$454 $— $— $— $— 
Residential708 352 356 177 179 
Commercial346 97 249 123 126 
Industrial 164 16 148 47 101 
Other (b)128 12 73 31 42 
Wholesale - municipality6 — 6 — 6 
Wholesale - other (c)12 — 12 5 11 
Transmission112 112 — — — 
Revenues from Contracts with Customers$1,930 $589 $844 $383 $465 

2020 Nine Months
PPL (d)PPL Electric (d)LKELG&EKU
Licensed energy suppliers (a)$1,472 $— $— $— $— 
Residential1,948 937 1,011 509 502 
Commercial896 234 662 336 326 
Industrial 434 33 401 130 271 
Other (b)354 38 194 84 110 
Wholesale - municipality15 — 15 — 15 
Wholesale - other (c)28 — 28 25 36 
Transmission497 497 — — — 
Revenues from Contracts with Customers$5,644 $1,739 $2,311 $1,084 $1,260 
2019 Nine Months
PPLPPL ElectricLKELG&EKU
Licensed energy suppliers (a)$1,520 $— $— $— $— 
Residential2,058 1,060 998 504 494 
Commercial967 279 688 352 336 
Industrial 470 48 422 134 288 
Other (b)360 39 209 93 116 
Wholesale - municipality38 — 38 — 38 
Wholesale - other (c)36 — 36 35 28 
Transmission318 318 — — — 
Revenues from Contracts with Customers$5,767 $1,744 $2,391 $1,118 $1,300 
(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 the fourth quarter of 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 Contracts with Customers [Table Text Block]
The following table shows the accounts receivable and unbilled revenues balances that were impaired for the periods ended September 30.
Three MonthsNine Months
2020201920202019
PPL$8 $11 $22 $22 
PPL Electric3 8 12 14 
LKE4 2 7 5 
LG&E3 1 4 2 
KU1 1 3 3 
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 at December 31, 2019$44 $21 $9 $5 $4 
Contract liabilities at September 30, 2020
40 18 9 5 4 
Revenue recognized during the nine months ended September 30, 2020 that was included in the contract liability balance at December 31, 2019
28 9 9 5 4 
Contract liabilities at December 31, 2018$42 $23 $9 $5 $4 
Contract liabilities at September 30, 2019
42 19 9 5 4 
Revenue recognized during the nine months ended September 30, 2019 that was included in the contract liability balance at December 31, 2018
31 11 9 5 4