Asset Retirement Obligations (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($)
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	$ 282
Accretion	7
Changes in estimated timing or cost	22
Asset Retirement Obligation, Foreign Currency Translation Gain (Loss)	(3)
Obligations settled	(35)
Balance at End of Period	273
LG And E And KU Energy LLC [Member]
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	215
Accretion	7
Changes in estimated timing or cost	31
Asset Retirement Obligation, Foreign Currency Translation Gain (Loss)	0
Obligations settled	(35)
Balance at End of Period	218
Louisville Gas And Electric Co [Member]
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	73
Accretion	2
Changes in estimated timing or cost	3
Asset Retirement Obligation, Foreign Currency Translation Gain (Loss)	0
Obligations settled	(11)
Balance at End of Period	67
Kentucky Utilities Co [Member]
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	142
Accretion	5
Changes in estimated timing or cost	28
Asset Retirement Obligation, Foreign Currency Translation Gain (Loss)	0
Obligations settled	(24)
Balance at End of Period	$ 151