Income and Other Taxes (Unrecognized to End) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) Integer	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Income Tax Examination (Details) [Line Items]
Number of major tax jurisdictions tax returns are filed | Integer	4
Deferred Income Tax Expense (Benefit)	$ 338	$ 410	$ 753
Increase (Decrease) in Regulatory Assets and Liabilities	$ 88	(13)	12
US - Federal [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2015 and prior
Pennsylvania - State [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2015 and prior
Kentucky - State [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2014 and prior
United Kingdom - Foreign [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2015 and prior
LKE [Member] | Kentucky tax reform [Member]
Income Tax Examination (Details) [Line Items]
Deferred Income Tax Expense (Benefit)		9
LGE [Member] | Kentucky tax reform [Member]
Income Tax Examination (Details) [Line Items]
Increase (Decrease) in Regulatory Assets and Liabilities		16
KU [Member] | Kentucky tax reform [Member]
Income Tax Examination (Details) [Line Items]
Increase (Decrease) in Regulatory Assets and Liabilities		19
PPL Electric Utilities Corp [Member]
Income Tax Examination (Details) [Line Items]
Number of major tax jurisdictions tax returns are filed | Integer	2
Deferred Income Tax Expense (Benefit)	$ 90	133	263
Increase (Decrease) in Regulatory Assets and Liabilities	$ 43	19	5
PPL Electric Utilities Corp [Member] | US - Federal [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2015 and prior
PPL Electric Utilities Corp [Member] | Pennsylvania - State [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2015 and prior
LG And E And KU Energy LLC [Member]
Income Tax Examination (Details) [Line Items]
Number of major tax jurisdictions tax returns are filed | Integer	2
Deferred Income Tax Expense (Benefit)	$ 86	99	300
Increase (Decrease) in Regulatory Assets and Liabilities	$ 45	(32)	7
LG And E And KU Energy LLC [Member] | US - Federal [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2015 and prior
LG And E And KU Energy LLC [Member] | Kentucky - State [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2014 and prior
LG And E And KU Energy LLC [Member] | Kentucky tax reform [Member]
Income Tax Examination (Details) [Line Items]
Deferred Income Tax Expense (Benefit)	$ 9
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky tax reform [Member]
Income Tax Examination (Details) [Line Items]
Increase (Decrease) in Regulatory Assets and Liabilities	16
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky tax reform [Member]
Income Tax Examination (Details) [Line Items]
Increase (Decrease) in Regulatory Assets and Liabilities	$ 19
Louisville Gas And Electric Co [Member]
Income Tax Examination (Details) [Line Items]
Number of major tax jurisdictions tax returns are filed | Integer	2
Deferred Income Tax Expense (Benefit)	$ 56	61	126
Increase (Decrease) in Regulatory Assets and Liabilities	$ 19	(5)	5
Louisville Gas And Electric Co [Member] | US - Federal [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2015 and prior
Louisville Gas And Electric Co [Member] | Kentucky - State [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2014 and prior
Louisville Gas And Electric Co [Member] | Kentucky tax reform [Member]
Income Tax Examination (Details) [Line Items]
Increase (Decrease) in Regulatory Assets and Liabilities	$ 16
Kentucky Utilities Co [Member]
Income Tax Examination (Details) [Line Items]
Number of major tax jurisdictions tax returns are filed | Integer	2
Deferred Income Tax Expense (Benefit)	$ 41	50	154
Increase (Decrease) in Regulatory Assets and Liabilities	$ 26	$ (27)	$ 2
Kentucky Utilities Co [Member] | US - Federal [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2015 and prior
Kentucky Utilities Co [Member] | Kentucky - State [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2014 and prior
Kentucky Utilities Co [Member] | Kentucky tax reform [Member]
Income Tax Examination (Details) [Line Items]
Increase (Decrease) in Regulatory Assets and Liabilities	$ 19