CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Assets, Current [Abstract]
Cash and cash equivalents		$ 7,629	$ 442
Accounts receivable (less reserve:)
Customer		569	603
Other		89	86
Unbilled revenues		247	301
Fuel, materials and supplies		265	302
Prepayments		119	53
Regulatory Assets, Current		69	99
Other current assets		100	130
Current assets held for sale		0	18,983
Total Current Assets		9,018	20,900
Property, Plant and Equipment
Regulated utility plant		29,757	29,040
Less:  accumulated depreciation - regulated utility plant		6,314	6,008
Regulated utility plant, net		23,443	23,032
Non-regulated property, plant and equipment		246	237
Less:  accumulated depreciation - non-regulated property, plant and equipment		40	37
Non-regulated property, plant and equipment, net		206	200
Construction work in progress		1,296	1,268
Property, Plant and Equipment, net		24,945	24,500
Other Noncurrent Assets
Regulatory assets		1,281	1,262
Goodwill		716	716
Other intangibles		347	351
Pension benefit asset		67	24
Other noncurrent assets		385	363
Total Other Noncurrent Assets		2,796	2,716
Total Assets		36,759	48,116
Current Liabilities
Short-term debt		0	1,168
Long-term debt due within one year		2,200	1,074
Accounts payable		683	745
Taxes		261	69
Interest		96	113
Dividends		320	319
Regulatory liabilities		198	79
Other current liabilities		414	465
Current liabilities held for sale		0	11,023
Liabilities, Current, Total		4,172	15,055
Long-term Debt, Unclassified [Abstract]
Long-term Debt		11,095	13,615
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		3,079	2,536
Investment tax credits		120	122
Accrued pension obligations		189	189
Asset retirement obligations		140	132
Regulatory liabilities		2,468	2,530
Other deferred credits and noncurrent liabilities		544	564
Total Deferred Credits and Other Noncurrent Liabilities		6,540	6,073
Commitments and Contingent Liabilities
Equity
Common stock	[1]	8	8
Additional paid-in capital		12,281	12,270
Earnings reinvested		2,854	5,315
Accumulated other comprehensive loss		(191)	(4,220)
Total Equity		14,952	13,373
Total Liabilities and Equity		36,759	48,116
PPL Electric Utilities Corp [Member]
Assets, Current [Abstract]
Cash and cash equivalents		58	40
Accounts receivable (less reserve:)
Customer		304	311
Other		67	17
Accounts receivable from affiliates		10	10
Notes receivable from affiliate		1,075	0
Notes receivable from affiliate		1,075	0
Unbilled revenues		86	121
Fuel, materials and supplies		61	59
Prepayments		65	9
Regulatory Assets, Current		45	40
Other current assets		14	13
Total Current Assets		1,785	620
Property, Plant and Equipment
Regulated utility plant		13,860	13,514
Less:  accumulated depreciation - regulated utility plant		3,392	3,297
Regulated utility plant, net		10,468	10,217
Construction work in progress		577	592
Property, Plant and Equipment, net		11,045	10,809
Other Noncurrent Assets
Regulatory assets		522	541
Other intangibles		269	268
Pension benefit asset		40	12
Other noncurrent assets		123	74
Total Other Noncurrent Assets		954	895
Total Assets		13,784	12,324
Current Liabilities
Long-term debt due within one year		400	400
Accounts payable		352	428
Accounts payable to affiliates		36	39
Taxes		8	17
Interest		39	39
Regulatory liabilities		138	68
Other current liabilities		105	105
Liabilities, Current, Total		1,078	1,096
Long-term Debt, Unclassified [Abstract]
Long-term Debt		4,485	3,836
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		1,646	1,559
Accrued pension obligations		8	8
Regulatory liabilities		568	578
Other deferred credits and noncurrent liabilities		117	123
Total Deferred Credits and Other Noncurrent Liabilities		2,339	2,268
Commitments and Contingent Liabilities
Equity
Common stock	[2]	364	364
Additional paid-in capital		4,503	3,753
Earnings reinvested		1,015	1,007
Total Equity		5,882	5,124
Total Liabilities and Equity		13,784	12,324
Louisville Gas And Electric Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		4	7
Accounts receivable (less reserve:)
Customer		112	127
Other		40	35
Accounts receivable from affiliates		16	16
Unbilled revenues		66	79
Fuel, materials and supplies		94	119
Prepayments		17	14
Regulatory Assets, Current		21	23
Other current assets		1	1
Total Current Assets		371	421
Property, Plant and Equipment
Regulated utility plant		6,907	6,735
Less:  accumulated depreciation - regulated utility plant		1,102	1,020
Regulated utility plant, net		5,805	5,715
Construction work in progress		307	320
Property, Plant and Equipment, net		6,112	6,035
Other Noncurrent Assets
Regulatory assets		354	351
Goodwill		389	389
Other intangibles		33	35
Other noncurrent assets		121	114
Total Other Noncurrent Assets		897	889
Total Assets		7,380	7,345
Current Liabilities
Short-term debt		0	262
Long-term debt due within one year		28	292
Notes Payable, Related Parties, Current		282	0
Accounts payable		144	153
Accounts payable to affiliates		21	31
Taxes		25	32
Price risk management liabilities current		2	2
Interest		15	15
Current Customer Deposits		31	32
Regulatory liabilities		41	0
Asset Retirement Obligation, Current		9	10
Other current liabilities		39	50
Liabilities, Current, Total		637	879
Long-term Debt, Unclassified [Abstract]
Long-term Debt		1,978	1,715
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		729	716
Investment tax credits		32	33
Asset retirement obligations		51	57
Regulatory liabilities		840	882
Price risk management liabilities		18	21
Other deferred credits and noncurrent liabilities		92	94
Total Deferred Credits and Other Noncurrent Liabilities		1,762	1,803
Commitments and Contingent Liabilities
Equity
Common stock	[3]	424	424
Additional paid-in capital		1,967	1,923
Earnings reinvested		612	601
Total Equity		3,003	2,948
Total Liabilities and Equity		7,380	7,345
Kentucky Utilities Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		7	22
Accounts receivable (less reserve:)
Customer		148	156
Other		31	30
Accounts receivable from affiliates		0	1
Unbilled revenues		89	97
Fuel, materials and supplies		111	123
Prepayments		17	15
Regulatory Assets, Current		3	36
Other current assets		0	1
Total Current Assets		406	481
Property, Plant and Equipment
Regulated utility plant		9,006	8,808
Less:  accumulated depreciation - regulated utility plant		1,820	1,690
Regulated utility plant, net		7,186	7,118
Construction work in progress		362	321
Property, Plant and Equipment, net		7,548	7,439
Other Noncurrent Assets
Regulatory assets		405	370
Goodwill		607	607
Other intangibles		24	26
Other noncurrent assets		158	149
Total Other Noncurrent Assets		1,194	1,152
Total Assets		9,148	9,072
Current Liabilities
Short-term debt		0	203
Long-term debt due within one year		0	132
Notes Payable, Related Parties, Current		226	0
Accounts payable		105	121
Accounts payable to affiliates		39	43
Taxes		22	29
Interest		18	19
Current Customer Deposits		32	32
Regulatory liabilities		19	11
Asset Retirement Obligation, Current		23	40
Other current liabilities		45	59
Liabilities, Current, Total		529	689
Long-term Debt, Unclassified [Abstract]
Long-term Debt		2,618	2,486
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		846	835
Investment tax credits		87	88
Asset retirement obligations		89	75
Regulatory liabilities		1,060	1,070
Other deferred credits and noncurrent liabilities		46	47
Total Deferred Credits and Other Noncurrent Liabilities		2,128	2,115
Commitments and Contingent Liabilities
Equity
Common stock	[4]	308	308
Additional paid-in capital		2,917	2,857
Earnings reinvested		648	617
Total Equity		3,873	3,782
Total Liabilities and Equity		$ 9,148	$ 9,072

[1] 1,560,000 shares authorized; 769,564 and 768,907 shares issued and outstanding at June 30, 2021 and December 31, 2020.

[2] 170,000 shares authorized; 66,368 shares issued and outstanding at June 30, 2021 and December 31, 2020.

[3] 75,000 shares authorized; 21,294 shares issued and outstanding at June 30, 2021 and December 31, 2020.

[4] 80,000 shares authorized; 37,818 shares issued and outstanding at June 30, 2021 and December 31, 2020.