CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions		Sep. 30, 2021	Dec. 31, 2020
Assets, Current [Abstract]
Cash and cash equivalents		$ 4,767	$ 442
Accounts receivable (less reserve:)
Customer		578	603
Other		73	86
Unbilled revenues		233	301
Fuel, materials and supplies		304	302
Prepayments		90	53
Regulatory Assets, Current		60	99
Other current assets		92	130
Current assets held for sale		0	18,983
Total Current Assets		6,137	20,900
Property, Plant and Equipment
Regulated utility plant		30,056	29,040
Less:  accumulated depreciation - regulated utility plant		6,434	6,008
Regulated utility plant, net		23,622	23,032
Non-regulated property, plant and equipment		269	237
Less:  accumulated depreciation - non-regulated property, plant and equipment		41	37
Non-regulated property, plant and equipment, net		228	200
Construction work in progress		1,356	1,268
Property, Plant and Equipment, net		25,206	24,500
Other Noncurrent Assets
Regulatory assets		1,286	1,262
Goodwill		716	716
Other intangibles		344	351
Other noncurrent assets		482	387
Assets, Noncurrent		2,828	2,716
Total Assets		34,171	48,116
Current Liabilities
Short-term debt		0	1,168
Long-term debt due within one year		474	1,074
Accounts payable		635	745
Taxes		144	69
Interest		138	113
Dividends		318	319
Regulatory liabilities		187	79
Other current liabilities		447	465
Current liabilities held for sale		0	11,023
Liabilities, Current, Total		2,343	15,055
Long-term Debt, Unclassified [Abstract]
Long-term Debt		10,665	13,615
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		3,108	2,536
Investment tax credits		120	122
Accrued pension obligations		195	189
Asset retirement obligations		160	132
Regulatory liabilities		2,452	2,530
Other deferred credits and noncurrent liabilities		552	564
Total Deferred Credits and Other Noncurrent Liabilities		6,587	6,073
Commitments and Contingent Liabilities
Equity
Common stock	[1]	8	8
Additional paid-in capital		12,290	12,270
Treasury Stock		(282)	0
Earnings reinvested		2,743	5,315
Accumulated other comprehensive loss		(183)	(4,220)
Total Equity		14,576	13,373
Total Liabilities and Equity		34,171	48,116
PPL Electric Utilities Corp [Member]
Assets, Current [Abstract]
Cash and cash equivalents		59	40
Accounts receivable (less reserve:)
Customer		295	311
Other		27	17
Accounts receivable from affiliates		11	10
Notes receivable from affiliate		575	0
Notes receivable from affiliate		575	0
Unbilled revenues		84	121
Fuel, materials and supplies		59	59
Prepayments		41	9
Regulatory Assets, Current		32	40
Other current assets		16	13
Total Current Assets		1,199	620
Property, Plant and Equipment
Regulated utility plant		13,927	13,514
Less:  accumulated depreciation - regulated utility plant		3,387	3,297
Regulated utility plant, net		10,540	10,217
Construction work in progress		629	592
Property, Plant and Equipment, net		11,169	10,809
Other Noncurrent Assets
Regulatory assets		510	541
Other intangibles		269	268
Pension benefit asset		49	12
Other noncurrent assets		124	74
Assets, Noncurrent		952	895
Total Assets		13,320	12,324
Current Liabilities
Long-term debt due within one year		474	400
Accounts payable		351	428
Accounts payable to affiliates		44	39
Taxes		16	17
Interest		45	39
Regulatory liabilities		146	68
Other current liabilities		103	105
Liabilities, Current, Total		1,179	1,096
Long-term Debt, Unclassified [Abstract]
Long-term Debt		4,009	3,836
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		1,656	1,559
Accrued pension obligations		8	8
Regulatory liabilities		565	578
Other deferred credits and noncurrent liabilities		120	123
Total Deferred Credits and Other Noncurrent Liabilities		2,349	2,268
Commitments and Contingent Liabilities
Equity
Common stock	[2]	364	364
Additional paid-in capital		4,328	3,753
Earnings reinvested		1,091	1,007
Total Equity		5,783	5,124
Total Liabilities and Equity		13,320	12,324
Louisville Gas And Electric Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		5	7
Accounts receivable (less reserve:)
Customer		121	127
Other		35	35
Accounts receivable from affiliates		19	16
Unbilled revenues		60	79
Fuel, materials and supplies		126	119
Prepayments		16	14
Regulatory Assets, Current		24	23
Other current assets		0	1
Total Current Assets		406	421
Property, Plant and Equipment
Regulated utility plant		7,053	6,735
Less:  accumulated depreciation - regulated utility plant		1,155	1,020
Regulated utility plant, net		5,898	5,715
Construction work in progress		290	320
Property, Plant and Equipment, net		6,188	6,035
Other Noncurrent Assets
Regulatory assets		362	351
Goodwill		389	389
Other intangibles		31	35
Other noncurrent assets		115	114
Assets, Noncurrent		897	889
Total Assets		7,491	7,345
Current Liabilities
Short-term debt		0	262
Long-term debt due within one year		0	292
Notes Payable, Related Parties, Current		284	0
Accounts payable		148	153
Accounts payable to affiliates		22	31
Taxes		37	32
Price risk management liabilities current		2	2
Interest		32	15
Current Customer Deposits		31	32
Regulatory liabilities		30	0
Asset Retirement Obligation, Current		12	10
Other current liabilities		48	50
Liabilities, Current, Total		646	879
Long-term Debt, Unclassified [Abstract]
Long-term Debt		2,006	1,715
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		737	716
Investment tax credits		32	33
Asset retirement obligations		77	57
Regulatory liabilities		830	882
Price risk management liabilities		17	21
Other deferred credits and noncurrent liabilities		91	94
Total Deferred Credits and Other Noncurrent Liabilities		1,784	1,803
Commitments and Contingent Liabilities
Equity
Common stock	[3]	424	424
Additional paid-in capital		1,967	1,923
Earnings reinvested		664	601
Total Equity		3,055	2,948
Total Liabilities and Equity		7,491	7,345
Kentucky Utilities Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		8	22
Accounts receivable (less reserve:)
Customer		158	156
Other		7	30
Accounts receivable from affiliates		0	1
Unbilled revenues		80	97
Fuel, materials and supplies		120	123
Prepayments		18	15
Regulatory Assets, Current		4	36
Other current assets		0	1
Total Current Assets		395	481
Property, Plant and Equipment
Regulated utility plant		9,093	8,808
Less:  accumulated depreciation - regulated utility plant		1,892	1,690
Regulated utility plant, net		7,201	7,118
Construction work in progress		393	321
Property, Plant and Equipment, net		7,594	7,439
Other Noncurrent Assets
Regulatory assets		414	370
Goodwill		607	607
Other intangibles		23	26
Other noncurrent assets		155	149
Assets, Noncurrent		1,199	1,152
Total Assets		9,188	9,072
Current Liabilities
Short-term debt		0	203
Long-term debt due within one year		0	132
Notes Payable, Related Parties, Current		208	0
Accounts payable		92	121
Accounts payable to affiliates		44	43
Taxes		38	29
Interest		44	19
Current Customer Deposits		32	32
Regulatory liabilities		11	11
Asset Retirement Obligation, Current		29	40
Other current liabilities		48	59
Liabilities, Current, Total		546	689
Long-term Debt, Unclassified [Abstract]
Long-term Debt		2,618	2,486
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		856	835
Investment tax credits		87	88
Asset retirement obligations		83	75
Regulatory liabilities		1,057	1,070
Other deferred credits and noncurrent liabilities		44	47
Total Deferred Credits and Other Noncurrent Liabilities		2,127	2,115
Commitments and Contingent Liabilities
Equity
Common stock	[4]	308	308
Additional paid-in capital		2,917	2,857
Earnings reinvested		672	617
Total Equity		3,897	3,782
Total Liabilities and Equity		$ 9,188	$ 9,072

[1] 1,560,000 shares authorized, 769,723 shares issued and 760,109 shares outstanding at September 30, 2021. 1,560,000 shares authorized; 768,907 shares issued and outstanding at December 31, 2020.

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

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

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