Segment and Related Information (Details) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2025 USD ($)		Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) Integer		Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Income Statement Data [Abstract]
Revenues		$ 2,239		$ 2,066	$ 6,768		$ 6,251
Fuel		231		207	657		597
Energy purchases		422		338	1,369		1,133
Depreciation		331		322	977		957
Taxes, other than income		100		90	314		271
Other Income (Expense) - net		(39)		(32)	(90)		(86)
Interest Expense		210		188	599		549
Income Taxes		80		58	229		189
Net income (loss)		318		214	915		711
Balance Sheet Data [Abstract]
Total Assets		43,939			43,939			$ 41,069
Segment (Numeric) [Abstract]
Goodwill		2,247			$ 2,247			2,247
Number of Reportable Segments | Integer					3
Segment, Expenditure, Addition to Long-Lived Assets					$ 2,868		1,945
Amortization					73		61
Deferred income taxes and investment tax credits					177		147
Total Segments
Income Statement Data [Abstract]
Revenues		2,239		2,066	6,768		6,250
Fuel		231		207	657		597
Energy purchases		420		337	1,369		1,132
Utilities Operating Expense, Maintenance and Operations		557		583	1,692		1,651
Depreciation		330		321	973		954
Taxes, other than income		102		90	315		271
Other Income (Expense) - net		(33)		(28)	(76)		(73)
Interest Expense		163		146	458		437
Income Taxes		100		92	291		284
Net income (loss)		371		325	1,096		1,024
Segment (Numeric) [Abstract]
Segment, Expenditure, Addition to Long-Lived Assets					2,864		1,954
Amortization					63		54
Deferred income taxes and investment tax credits					122		128
Total Segments | Related Party
Segment (Numeric) [Abstract]
Interest Income from affiliate		(2)		(7)	(7)		(27)
Rhode Island Regulated
Income Statement Data [Abstract]
Revenues		509		455	1,629		1,393
Fuel		0		0	0		0
Energy purchases		173		135	598		464
Utilities Operating Expense, Maintenance and Operations		196		211	610		547
Depreciation		45		42	131		123
Taxes, other than income		38		33	127		99
Other Income (Expense) - net		(2)		(7)	(5)		(20)
Interest Expense		28		25	78		72
Income Taxes		4		2	13		18
Net income (loss)		27		14	80		90
Balance Sheet Data [Abstract]
Total Assets		7,247			7,247			7,055
Segment (Numeric) [Abstract]
Segment, Expenditure, Addition to Long-Lived Assets					539		342
Amortization					1		1
Deferred income taxes and investment tax credits					38		38
Rhode Island Regulated | Related Party
Segment (Numeric) [Abstract]
Interest Income from affiliate		0		0	(3)		0
Pennsylvania Regulated [Member]
Income Statement Data [Abstract]
Revenues		786		716	2,298		2,159
Fuel		0		0	0		0
Energy purchases		224		177	622		544
Utilities Operating Expense, Maintenance and Operations		160		176	481		511
Depreciation		105		101	307		300
Taxes, other than income		38		32	111		98
Other Income (Expense) - net		(14)		(13)	(36)		(33)
Interest Expense		67		61	189		184
Income Taxes		49		47	146		141
Net income (loss)		159		142	482		441
Balance Sheet Data [Abstract]
Total Assets		16,702			16,702			15,475
Segment (Numeric) [Abstract]
Segment, Expenditure, Addition to Long-Lived Assets					1,082		820
Amortization					34		35
Deferred income taxes and investment tax credits					63		91
Pennsylvania Regulated [Member] | Related Party
Segment (Numeric) [Abstract]
Interest Income from affiliate		(2)		(7)	(4)		(27)
Kentucky Regulated [Member]
Income Statement Data [Abstract]
Revenues		944		895	2,841		2,698
Fuel		231		207	657		597
Energy purchases		23		25	149		124
Utilities Operating Expense, Maintenance and Operations		201		196	601		593
Depreciation		180		178	535		531
Taxes, other than income		26		25	77		74
Other Income (Expense) - net		(17)		(8)	(35)		(20)
Interest Expense		68		60	191		181
Income Taxes		47		43	132		125
Net income (loss)		185		169	534		493
Balance Sheet Data [Abstract]
Total Assets		19,234			19,234			17,626
Segment (Numeric) [Abstract]
Segment, Expenditure, Addition to Long-Lived Assets					1,243		792
Amortization					28		18
Deferred income taxes and investment tax credits					21		(1)
Kentucky Regulated [Member] | Related Party
Segment (Numeric) [Abstract]
Interest Income from affiliate		0		0	0		0
Corporate and Other [Member]
Income Statement Data [Abstract]
Revenues		0		0	0		1
Income Taxes		(22)		(34)	(63)		(96)
Net income (loss)		(53)		(111)	(181)		(313)
Balance Sheet Data [Abstract]
Total Assets		756			756			913
Segment (Numeric) [Abstract]
Segment, Expenditure, Addition to Long-Lived Assets					4		(9)
Amortization					10		7
Deferred income taxes and investment tax credits					55		19
PPL Electric Utilities Corp [Member]
Income Statement Data [Abstract]
Revenues		786		716	2,298		2,159
Energy purchases		224		177	622		544
Depreciation		105		101	307		300
Taxes, other than income		38		32	111		98
Other Income (Expense) - net		(14)		(13)	(36)		(33)
Interest Expense		67		61	189		184
Income Taxes		49		47	146		141
Net income (loss)	[1]	159		142	482		441
Balance Sheet Data [Abstract]
Total Assets		16,702			$ 16,702			15,475
Segment (Numeric) [Abstract]
Number of Reportable Segments | Integer					1
Number of Operating Segments | Integer					2
Amortization					$ 34		35
Deferred income taxes and investment tax credits					63		91
PPL Electric Utilities Corp [Member] | Related Party
Segment (Numeric) [Abstract]
Interest Income from affiliate		(2)		(7)	(4)		(27)
Louisville Gas And Electric Co [Member]
Income Statement Data [Abstract]
Revenues		427		397	1,310		1,239
Fuel		97		75	254		228
Energy purchases		17		19	128		105
Depreciation		77		76	228		229
Taxes, other than income		13		13	39		38
Other Income (Expense) - net		(8)		(3)	(16)		(9)
Interest Expense		30		26	83		78
Income Taxes		21		20	61		61
Net income (loss)		83	[2]	77	244	[2]	232
Balance Sheet Data [Abstract]
Total Assets		8,848			8,848			7,992
Segment (Numeric) [Abstract]
Goodwill		389			$ 389			389
Number of Reportable Segments | Integer					1
Number of Operating Segments | Integer					1
Amortization					$ 17		10
Deferred income taxes and investment tax credits					1		3
Louisville Gas And Electric Co [Member] | Related Party
Segment (Numeric) [Abstract]
Interest Income from affiliate		0		(1)	0		(1)
Kentucky Utilities Co [Member]
Income Statement Data [Abstract]
Revenues		530		509	1,566		1,498
Fuel		135		131	404		369
Energy purchases		6		7	20		19
Depreciation		102		102	305		302
Taxes, other than income		13		12	38		36
Other Income (Expense) - net		(9)		(4)	(19)		(10)
Interest Expense					108		102
Income Taxes		28		24	78		70
Net income (loss)	[3]	109		98	312		283
Balance Sheet Data [Abstract]
Total Assets		10,833			10,833			10,073
Segment (Numeric) [Abstract]
Goodwill		607			$ 607			$ 607
Number of Reportable Segments | Integer					1
Number of Operating Segments | Integer					1
Amortization					$ 13		14
Deferred income taxes and investment tax credits					11		(12)
Kentucky Utilities Co [Member] | Related Party
Income Statement Data [Abstract]
Interest Expense		$ 0		$ 0	$ 0		$ 1

[1] Net income equals comprehensive income.

[2] Net income equals comprehensive income.

[3] Net income equals comprehensive income.