Segment and Related Information (Details) $ in Millions		3 Months Ended
		Mar. 31, 2021 USD ($) Integer	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Income Statement Data [Abstract]
Operating Revenues from external customers		$ 1,498	$ 1,440
Net income (loss)		(1,840)	554
Balance Sheet Data [Abstract]
Assets		47,781		$ 48,116
Segment (Numeric) [Abstract]
Goodwill		716		716
Kentucky Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		885	825
Net income (loss)		146	127
Financing Costs Allocated to Segment, Net of Tax			8
Income Taxes Allocated to Segment			2
Balance Sheet Data [Abstract]
Assets		15,904		15,943
Pennsylvania Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		605	608
Net income (loss)		113	118
Balance Sheet Data [Abstract]
Assets		12,585		12,347
Corporate and Other [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		8	7
Net income (loss)		(56)	(41)
Balance Sheet Data [Abstract]
Assets		867		843
DiscontinuedOperationsSegment
Income Statement Data [Abstract]
Net income (loss)		(2,043)	350
Balance Sheet Data [Abstract]
Assets		18,425		18,983
PPL Electric Utilities Corp [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		605	608
Net income (loss)	[1]	113	118
Balance Sheet Data [Abstract]
Assets		$ 12,554		12,324
Segment (Numeric) [Abstract]
Number of Reportable Segments | Integer		1
Number of Operating Segments | Integer		2
LG And E And KU Energy LLC [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		$ 885	825
Net income (loss)	[2]	146	135
Balance Sheet Data [Abstract]
Assets		16,238		16,277
Segment (Numeric) [Abstract]
Goodwill		$ 996		996
Number of Reportable Segments | Integer		1
Number of Operating Segments | Integer		1
Louisville Gas And Electric Co [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		$ 428	407
Net income (loss)	[3]	75	73
Balance Sheet Data [Abstract]
Assets		7,328		7,345
Segment (Numeric) [Abstract]
Goodwill		$ 389		389
Number of Reportable Segments | Integer		1
Number of Operating Segments | Integer		1
Kentucky Utilities Co [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		$ 469	432
Net income (loss)	[4]	86	$ 80
Balance Sheet Data [Abstract]
Assets		9,060		9,072
Segment (Numeric) [Abstract]
Goodwill		$ 607		$ 607
Number of Reportable Segments | Integer		1
Number of Operating Segments | Integer		1

[1] Net income equals comprehensive income.

[2] Net income approximates comprehensive income.

[3] Net income equals comprehensive income.

[4] Net income equals comprehensive income.