CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Receivables Net Current [Abstract]
Accounts receivable reserve for uncollectible accounts	$ 65	$ 71
Unbilled Revenues, Reserve	2	4
Other Noncurrent Assets [Abstract]
Accounts Receivable, Allowance for Credit Loss, Noncurrent	$ 2	$ 0
Equity
Common stock par value	$ 0.01	$ 0.01
Common stock shares authorized	1,560,000	1,560,000
Common stock shares issued	769,890	768,907
Common stock shares outstanding	735,112	768,907
PPL Electric Utilities Corp [Member]
Receivables Net Current [Abstract]
Accounts receivable reserve for uncollectible accounts	$ 31	$ 41
Unbilled Revenues, Reserve	2	2
Other Noncurrent Assets [Abstract]
Accounts Receivable, Allowance for Credit Loss, Noncurrent	$ 2	$ 0
Equity
Common stock no par value	$ 0	$ 0
Common stock shares authorized	170,000	170,000
Common stock shares issued	66,368	66,368
Common stock shares outstanding	66,368	66,368
Louisville Gas And Electric Co [Member]
Receivables Net Current [Abstract]
Accounts receivable reserve for uncollectible accounts	$ 3	$ 2
Unbilled Revenues, Reserve	$ 0	$ 1
Equity
Common stock no par value	$ 0	$ 0
Common stock shares authorized	75,000	75,000
Common stock shares issued	21,294	21,294
Common stock shares outstanding	21,294	21,294
Kentucky Utilities Co [Member]
Receivables Net Current [Abstract]
Accounts receivable reserve for uncollectible accounts	$ 3	$ 1
Unbilled Revenues, Reserve	$ 0	$ 1
Equity
Common stock no par value	$ 0	$ 0
Common stock shares authorized	80,000	80,000
Common stock shares issued	37,818	37,818
Common stock shares outstanding	37,818	37,818