CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
Assets, Current [Abstract]
Cash and cash equivalents		$ 421	$ 442
Accounts receivable (less reserve:)
Customer		634	603
Other		77	86
Unbilled revenues		225	301
Fuel, materials and supplies		260	302
Prepayments		132	53
Regulatory assets		121	99
Other current assets		32	31
Current assets held for sale		18,425	18,983
Total Current Assets		20,327	20,900
Property, Plant and Equipment
Regulated utility plant		29,354	29,040
Less:  accumulated depreciation - regulated utility plant		6,156	6,008
Regulated utility plant, net		23,198	23,032
Non-regulated property, plant and equipment		245	237
Less:  accumulated depreciation - non-regulated property, plant and equipment		38	37
Non-regulated property, plant and equipment, net		207	200
Construction work in progress		1,292	1,268
Property, Plant and Equipment, net		24,697	24,500
Other Noncurrent Assets
Regulatory assets		1,233	1,262
Goodwill		716	716
Other intangibles		348	351
Pension benefit asset		67	24
Other noncurrent assets		393	363
Total Other Noncurrent Assets		2,757	2,716
Total Assets		47,781	48,116
Current Liabilities
Short-term debt		1,547	1,168
Long-term debt due within one year		976	1,074
Accounts payable		660	745
Taxes		45	69
Interest		182	113
Dividends		320	319
Regulatory liabilities		130	79
Other current liabilities		387	465
Current liabilities held for sale		11,376	11,023
Total Current Liabilities		15,623	15,055
Long-term Debt
Long-term Debt		13,715	13,615
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		3,370	2,536
Investment tax credits		121	122
Accrued pension obligations		183	189
Asset retirement obligations		130	132
Regulatory liabilities		2,526	2,530
Other deferred credits and noncurrent liabilities		559	564
Total Deferred Credits and Other Noncurrent Liabilities		6,889	6,073
Commitments and Contingent Liabilities
Equity
Common stock	[1]	8	8
Additional paid-in capital		12,273	12,270
Earnings reinvested		3,155	5,315
Accumulated other comprehensive loss		(3,882)	(4,220)
Total Equity		11,554	13,373
Total Liabilities and Equity		47,781	48,116
PPL Electric Utilities Corp [Member]
Assets, Current [Abstract]
Cash and cash equivalents		29	40
Accounts receivable (less reserve:)
Customer		346	311
Other		19	17
Accounts receivable from affiliates		10	10
Unbilled revenues		84	121
Fuel, materials and supplies		59	59
Prepayments		87	9
Regulatory assets		47	40
Other current assets		15	13
Total Current Assets		696	620
Property, Plant and Equipment
Regulated utility plant		13,680	13,514
Less:  accumulated depreciation - regulated utility plant		3,348	3,297
Regulated utility plant, net		10,332	10,217
Construction work in progress		588	592
Property, Plant and Equipment, net		10,920	10,809
Other Noncurrent Assets
Regulatory assets		525	541
Other intangibles		268	268
Pension benefit asset		42	12
Other noncurrent assets		103	74
Total Other Noncurrent Assets		938	895
Total Assets		12,554	12,324
Current Liabilities
Short-term debt		205	0
Long-term debt due within one year		400	400
Accounts payable		375	428
Accounts payable to affiliates		71	39
Taxes		10	17
Interest		45	39
Regulatory liabilities		114	68
Other current liabilities		94	105
Total Current Liabilities		1,314	1,096
Long-term Debt
Long-term Debt		3,837	3,836
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		1,579	1,559
Accrued pension obligations		8	8
Regulatory liabilities		573	578
Other deferred credits and noncurrent liabilities		121	123
Total Deferred Credits and Other Noncurrent Liabilities		2,281	2,268
Commitments and Contingent Liabilities
Equity
Common stock	[2]	364	364
Additional paid-in capital		3,753	3,753
Earnings reinvested		1,005	1,007
Total Equity		5,122	5,124
Total Liabilities and Equity		12,554	12,324
LG And E And KU Energy LLC [Member]
Assets, Current [Abstract]
Cash and cash equivalents		16	29
Accounts receivable (less reserve:)
Customer		282	283
Other		52	69
Unbilled revenues		137	176
Fuel, materials and supplies		200	242
Prepayments		27	30
Regulatory assets		74	59
Other current assets		1	4
Total Current Assets		789	892
Property, Plant and Equipment
Regulated utility plant		15,706	15,557
Less:  accumulated depreciation - regulated utility plant		2,816	2,717
Regulated utility plant, net		12,890	12,840
Construction work in progress		669	640
Property, Plant and Equipment, net		13,559	13,480
Other Noncurrent Assets
Regulatory assets		708	721
Goodwill		996	996
Other intangibles		59	61
Other noncurrent assets		127	127
Total Other Noncurrent Assets		1,890	1,905
Total Assets		16,238	16,277
Current Liabilities
Short-term debt		400	465
Long-term debt due within one year		476	674
Notes payable with affiliates		227	251
Accounts payable		261	294
Accounts payable to affiliates		25	16
Taxes		53	71
Price risk management liabilities		1	2
Interest		82	37
Current Customer Deposits		64	64
Regulatory liabilities		16	11
Asset retirement obligations		41	50
Other current liabilities		108	162
Total Current Liabilities		1,754	2,097
Long-term Debt
Long-term debt		4,399	4,200
Long-term debt to affiliate		1,200	1,200
Long-term Debt		5,599	5,400
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		1,208	1,175
Investment tax credits		121	121
Accrued pension obligations		106	112
Asset retirement obligations		130	132
Regulatory liabilities		1,953	1,952
Price risk management liabilities		16	21
Other deferred credits and noncurrent liabilities		148	151
Total Deferred Credits and Other Noncurrent Liabilities		3,682	3,664
Commitments and Contingent Liabilities
Equity
Member's Equity		5,203	5,116
Total Liabilities and Equity		16,238	16,277
Louisville Gas And Electric Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		7	7
Accounts receivable (less reserve:)
Customer		129	127
Other		25	35
Accounts receivable from affiliates		19	16
Unbilled revenues		60	79
Fuel, materials and supplies		91	119
Prepayments		13	14
Regulatory assets		36	23
Other current assets		1	1
Total Current Assets		381	421
Property, Plant and Equipment
Regulated utility plant		6,805	6,735
Less:  accumulated depreciation - regulated utility plant		1,056	1,020
Regulated utility plant, net		5,749	5,715
Construction work in progress		319	320
Property, Plant and Equipment, net		6,068	6,035
Other Noncurrent Assets
Regulatory assets		339	351
Goodwill		389	389
Other intangibles		34	35
Other noncurrent assets		117	114
Total Other Noncurrent Assets		879	889
Total Assets		7,328	7,345
Current Liabilities
Short-term debt		252	262
Long-term debt due within one year		94	292
Accounts payable		137	153
Accounts payable to affiliates		27	31
Taxes		36	32
Price risk management liabilities		1	2
Interest		33	15
Current Customer Deposits		31	32
Regulatory liabilities		3	0
Asset retirement obligations		14	10
Other current liabilities		33	50
Total Current Liabilities		661	879
Long-term Debt
Long-term Debt		1,913	1,715
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		719	716
Investment tax credits		33	33
Asset retirement obligations		48	57
Regulatory liabilities		881	882
Price risk management liabilities		16	21
Other deferred credits and noncurrent liabilities		94	94
Total Deferred Credits and Other Noncurrent Liabilities		1,791	1,803
Commitments and Contingent Liabilities
Equity
Common stock	[3]	424	424
Additional paid-in capital		1,923	1,923
Earnings reinvested		616	601
Total Equity		2,963	2,948
Total Liabilities and Equity		7,328	7,345
Kentucky Utilities Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		8	22
Accounts receivable (less reserve:)
Customer		153	156
Other		25	30
Accounts receivable from affiliates		0	1
Unbilled revenues		77	97
Fuel, materials and supplies		109	123
Prepayments		13	15
Regulatory assets		38	36
Other current assets		0	1
Total Current Assets		423	481
Property, Plant and Equipment
Regulated utility plant		8,886	8,808
Less:  accumulated depreciation - regulated utility plant		1,753	1,690
Regulated utility plant, net		7,133	7,118
Construction work in progress		350	321
Property, Plant and Equipment, net		7,483	7,439
Other Noncurrent Assets
Regulatory assets		369	370
Goodwill		607	607
Other intangibles		25	26
Other noncurrent assets		153	149
Total Other Noncurrent Assets		1,154	1,152
Total Assets		9,060	9,072
Current Liabilities
Short-term debt		148	203
Long-term debt due within one year		132	132
Accounts payable		109	121
Accounts payable to affiliates		46	43
Taxes		42	29
Interest		44	19
Current Customer Deposits		33	32
Regulatory liabilities		13	11
Asset retirement obligations		27	40
Other current liabilities		40	59
Total Current Liabilities		634	689
Long-term Debt
Long-term Debt		2,486	2,486
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		839	835
Investment tax credits		88	88
Asset retirement obligations		82	75
Regulatory liabilities		1,072	1,070
Other deferred credits and noncurrent liabilities		47	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		2,857	2,857
Earnings reinvested		647	617
Total Equity		3,812	3,782
Total Liabilities and Equity		$ 9,060	$ 9,072

[1] 1,560,000 shares authorized; 769,427 and 768,907 shares issued and outstanding at March 31, 2021 and December 31, 2020.

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

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

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