Summary of Significant Accounting Policies (Details) - Allowance For Doubtful Accounts [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	$ 75	$ 58	$ 56	$ 51
Additions charged to income	31	37	41
Additions charged to other accounts	0	3	3
Deductions	16	38	39
SEC Schedule, 12-09, Valuation Allowances and Reserves, Adjusted for CECL, Amount		60
PPL Electric Utilities Corp [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	41	28	27	$ 24
Additions charged to income	19	26	29
Additions charged to other accounts	0	0	0
Deductions	$ 8	25	$ 26
SEC Schedule, 12-09, Valuation Allowances and Reserves, Adjusted for CECL, Amount		$ 30