CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019
Assets, Current [Abstract]
Cash and cash equivalents		$ 915	$ 815
Accounts receivable (less reserve:)
Customer		730	687
Other		107	105
Unbilled revenues		434	504
Fuel, materials and supplies		320	332
Prepayments		155	79
Price risk management assets		193	147
Regulatory assets		75	67
Other current assets		102	98
Total Current Assets		2,956	2,767
Property, Plant and Equipment
Regulated utility plant		43,109	42,709
Less: accumulated depreciation - regulated utility plant		8,212	8,055
Regulated utility plant, net		34,897	34,654
Non-regulated property, plant and equipment		380	357
Less: accumulated depreciation - non-regulated property, plant and equipment		87	109
Non-regulated property, plant and equipment, net		293	248
Construction work in progress		1,645	1,580
Property, Plant and Equipment, net		36,835	36,482
Other Noncurrent Assets
Regulatory assets		1,477	1,492
Goodwill		3,178	3,198
Other intangibles		748	742
Pension benefit asset		603	464
Price risk management assets		166	149
Other noncurrent assets		365	386
Total Other Noncurrent Assets		6,537	6,431
Total Assets		46,328	45,680
Current Liabilities
Short-term debt		1,696	1,151
Long-term debt due within one year		1,170	1,172
Accounts payable		833	956
Taxes		100	99
Interest		352	294
Dividends		319	317
Customer deposits		265	261
Regulatory liabilities		99	115
Other current liabilities		488	535
Total Current Liabilities		5,322	4,900
Long-term Debt
Long-term Debt		20,670	20,721
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		3,217	3,088
Investment tax credits		123	124
Accrued pension obligations		500	587
Asset retirement obligations		217	212
Regulatory liabilities		2,557	2,572
Other deferred credits and noncurrent liabilities		481	485
Total Deferred Credits and Other Noncurrent Liabilities		7,095	7,068
Commitments and Contingent Liabilities
Equity
Common stock	[1]	8	8
Additional paid-in capital		12,239	12,214
Earnings reinvested		5,360	5,127
Accumulated other comprehensive loss		(4,366)	(4,358)
Total Equity		13,241	12,991
Total Liabilities and Equity		46,328	45,680
PPL Electric Utilities Corp [Member]
Assets, Current [Abstract]
Cash and cash equivalents		33	262
Accounts receivable (less reserve:)
Customer		289	258
Other		18	22
Accounts receivable from affiliates		10	11
Unbilled revenues		100	134
Fuel, materials and supplies		48	33
Prepayments		82	6
Regulatory assets		23	26
Other current assets		10	9
Total Current Assets		613	761
Property, Plant and Equipment
Regulated utility plant		12,750	12,589
Less: accumulated depreciation - regulated utility plant		3,137	3,078
Regulated utility plant, net		9,613	9,511
Construction work in progress		633	597
Property, Plant and Equipment, net		10,246	10,108
Other Noncurrent Assets
Regulatory assets		710	726
Other intangibles		264	263
Other noncurrent assets		49	43
Total Other Noncurrent Assets		1,023	1,032
Total Assets		11,882	11,901
Current Liabilities
Short-term debt		85	0
Accounts payable		394	438
Accounts payable to affiliates		34	32
Taxes		11	13
Interest		48	41
Regulatory liabilities		83	96
Other current liabilities		75	93
Total Current Liabilities		730	713
Long-term Debt
Long-term Debt		3,986	3,985
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		1,487	1,447
Accrued pension obligations		153	179
Regulatory liabilities		595	599
Other deferred credits and noncurrent liabilities		146	146
Total Deferred Credits and Other Noncurrent Liabilities		2,381	2,371
Commitments and Contingent Liabilities
Equity
Common stock	[2]	364	364
Additional paid-in capital		3,558	3,558
Earnings reinvested		863	910
Total Equity		4,785	4,832
Total Liabilities and Equity		11,882	11,901
LG And E And KU Energy LLC [Member]
Assets, Current [Abstract]
Cash and cash equivalents		47	27
Accounts receivable (less reserve:)
Customer		246	260
Other		65	71
Unbilled revenues		137	164
Fuel, materials and supplies		226	250
Prepayments		23	30
Regulatory assets		52	41
Other current assets		0	2
Total Current Assets		796	845
Property, Plant and Equipment
Regulated utility plant		14,798	14,646
Less: accumulated depreciation - regulated utility plant		2,401	2,356
Regulated utility plant, net		12,397	12,290
Construction work in progress		793	794
Property, Plant and Equipment, net		13,190	13,084
Other Noncurrent Assets
Regulatory assets		767	766
Goodwill		996	996
Other intangibles		67	69
Other noncurrent assets		126	171
Total Other Noncurrent Assets		1,956	2,002
Total Assets		15,942	15,931
Current Liabilities
Short-term debt		303	388
Long-term debt due within one year		975	975
Notes payable with affiliates		242	150
Accounts payable		257	316
Accounts payable to affiliates		12	11
Taxes		31	58
Price risk management liabilities		4	4
Interest		91	40
Customer deposits		64	62
Regulatory liabilities		16	19
Asset retirement obligations		66	70
Other current liabilities		116	153
Total Current Liabilities		2,177	2,246
Long-term Debt
Long-term debt		4,378	4,377
Long-term debt to affiliate		650	650
Long-term Debt		5,028	5,027
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		1,111	1,069
Investment tax credits		123	124
Accrued pension obligations		184	233
Asset retirement obligations		151	145
Regulatory liabilities		1,962	1,973
Price risk management liabilities		25	17
Other deferred credits and noncurrent liabilities		155	155
Total Deferred Credits and Other Noncurrent Liabilities		3,711	3,716
Commitments and Contingent Liabilities
Equity
Member's Equity		5,026	4,942
Total Liabilities and Equity		15,942	15,931
Louisville Gas And Electric Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		7	15
Accounts receivable (less reserve:)
Customer		115	121
Other		40	41
Accounts receivable from affiliates		24	18
Unbilled revenues		65	76
Fuel, materials and supplies		95	122
Prepayments		12	14
Regulatory assets		26	25
Other current assets		0	1
Total Current Assets		384	433
Property, Plant and Equipment
Regulated utility plant		6,469	6,372
Less: accumulated depreciation - regulated utility plant		881	846
Regulated utility plant, net		5,588	5,526
Construction work in progress		271	297
Property, Plant and Equipment, net		5,859	5,823
Other Noncurrent Assets
Regulatory assets		383	380
Goodwill		389	389
Other intangibles		40	41
Other noncurrent assets		70	67
Total Other Noncurrent Assets		882	877
Total Assets		7,125	7,133
Current Liabilities
Short-term debt		159	238
Notes payable with affiliates		21	0
Accounts payable		141	172
Accounts payable to affiliates		27	31
Taxes		35	33
Price risk management liabilities		4	4
Interest		33	15
Customer deposits		32	31
Regulatory liabilities		1	2
Asset retirement obligations		24	24
Other current liabilities		40	47
Total Current Liabilities		517	597
Long-term Debt
Long-term Debt		2,005	2,005
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		702	697
Investment tax credits		33	34
Asset retirement obligations		43	49
Regulatory liabilities		879	883
Price risk management liabilities		25	17
Other deferred credits and noncurrent liabilities		90	89
Total Deferred Credits and Other Noncurrent Liabilities		1,772	1,769
Commitments and Contingent Liabilities
Equity
Common stock	[3]	424	424
Additional paid-in capital		1,845	1,820
Earnings reinvested		562	518
Total Equity		2,831	2,762
Total Liabilities and Equity		7,125	7,133
Kentucky Utilities Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		40	12
Accounts receivable (less reserve:)
Customer		131	139
Other		22	27
Notes receivable from affiliate		21	0
Unbilled revenues		72	88
Fuel, materials and supplies		131	128
Prepayments		10	14
Regulatory assets		26	16
Other current assets		0	1
Total Current Assets		453	425
Property, Plant and Equipment
Regulated utility plant		8,315	8,262
Less: accumulated depreciation - regulated utility plant		1,516	1,507
Regulated utility plant, net		6,799	6,755
Construction work in progress		522	496
Property, Plant and Equipment, net		7,321	7,251
Other Noncurrent Assets
Regulatory assets		384	386
Goodwill		607	607
Other intangibles		28	28
Other noncurrent assets		114	128
Total Other Noncurrent Assets		1,133	1,149
Total Assets		8,907	8,825
Current Liabilities
Short-term debt		144	150
Long-term debt due within one year		500	500
Accounts payable		96	121
Accounts payable to affiliates		50	52
Taxes		32	26
Interest		45	20
Customer deposits		32	31
Regulatory liabilities		15	17
Asset retirement obligations		42	46
Other current liabilities		44	51
Total Current Liabilities		1,000	1,014
Long-term Debt
Long-term Debt		2,124	2,123
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		801	792
Investment tax credits		90	90
Asset retirement obligations		108	96
Regulatory liabilities		1,083	1,090
Other deferred credits and noncurrent liabilities		47	46
Total Deferred Credits and Other Noncurrent Liabilities		2,129	2,114
Commitments and Contingent Liabilities
Equity
Common stock	[4]	308	308
Additional paid-in capital		2,766	2,729
Earnings reinvested		580	537
Total Equity		3,654	3,574
Total Liabilities and Equity		$ 8,907	$ 8,825

[1] 1,560,000 shares authorized; 768,266 and 767,233 shares issued and outstanding at March 31, 2020 and December 31, 2019.

[2] 170,000 shares authorized; 66,368 shares issued and outstanding at March 31, 2020 and December 31, 2019.

[3] 75,000 shares authorized; 21,294 shares issued and outstanding at March 31, 2020 and December 31, 2019.

[4] 80,000 shares authorized; 37,818 shares issued and outstanding at March 31, 2020 and December 31, 2019.