CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions		Mar. 31, 2019	Dec. 31, 2018
Assets, Current [Abstract]
Cash and cash equivalents		$ 518	$ 621
Accounts receivable (less reserve:)
Customer		749	663
Other		104	107
Unbilled revenues		456	496
Fuel, materials and supplies		274	303
Prepayments		157	70
Price risk management assets		109	109
Regulatory assets		38	36
Other current assets		62	63
Total Current Assets		2,429	2,432
Property, Plant and Equipment
Regulated utility plant		40,752	39,734
Less: accumulated depreciation - regulated utility plant		7,532	7,310
Regulated utility plant, net		33,220	32,424
Non-regulated property, plant and equipment		357	355
Less: accumulated depreciation - non-regulated property, plant and equipment		104	101
Non-regulated property, plant and equipment, net		253	254
Construction work in progress		1,834	1,780
Property, Plant and Equipment, net		35,307	34,458
Other Noncurrent Assets
Regulatory assets		1,666	1,673
Goodwill		3,260	3,162
Other intangibles		728	716
Pension benefit asset		715	535
Price risk management assets		172	228
Other noncurrent assets		290	192
Total Other Noncurrent Assets		6,831	6,506
Total Assets		44,567	43,396
Current Liabilities
Short-term debt		1,428	1,430
Long-term debt due within one year		202	530
Accounts payable		823	989
Taxes		112	110
Interest		332	278
Dividends		298	296
Customer deposits		260	257
Regulatory liabilities		100	122
Other current liabilities		506	551
Total Current Liabilities		4,061	4,563
Long-term Debt
Long-term Debt		21,114	20,069
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		2,941	2,796
Investment tax credits		125	126
Accrued pension obligations		718	771
Asset retirement obligations		267	264
Regulatory liabilities		2,700	2,714
Other deferred credits and noncurrent liabilities		469	436
Total Deferred Credits and Other Noncurrent Liabilities		7,220	7,107
Commitments and Contingent Liabilities
Equity
Common stock	[1]	7	7
Additional paid-in capital		11,051	11,021
Earnings reinvested		4,761	4,593
Accumulated other comprehensive loss		(3,647)	(3,964)
Total Equity		12,172	11,657
Total Liabilities and Equity		44,567	43,396
PPL Electric Utilities Corp [Member]
Assets, Current [Abstract]
Cash and cash equivalents		23	267
Accounts receivable (less reserve:)
Customer		320	264
Other		19	38
Accounts receivable from affiliates		11	11
Unbilled revenues		107	120
Fuel, materials and supplies		24	25
Prepayments		86	5
Regulatory assets		11	11
Other current assets		9	9
Total Current Assets		610	750
Property, Plant and Equipment
Regulated utility plant		11,794	11,637
Less: accumulated depreciation - regulated utility plant		2,892	2,856
Regulated utility plant, net		8,902	8,781
Construction work in progress		609	586
Property, Plant and Equipment, net		9,511	9,367
Other Noncurrent Assets
Regulatory assets		809	824
Other intangibles		260	260
Other noncurrent assets		53	42
Total Other Noncurrent Assets		1,122	1,126
Total Assets		11,243	11,243
Current Liabilities
Short-term debt		60	0
Accounts payable		373	418
Accounts payable to affiliates		48	25
Taxes		10	12
Interest		42	37
Regulatory liabilities		60	74
Other current liabilities		84	101
Total Current Liabilities		677	667
Long-term Debt
Long-term Debt		3,694	3,694
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		1,345	1,320
Accrued pension obligations		257	282
Regulatory liabilities		667	675
Other deferred credits and noncurrent liabilities		141	144
Total Deferred Credits and Other Noncurrent Liabilities		2,410	2,421
Commitments and Contingent Liabilities
Equity
Common stock	[2]	364	364
Additional paid-in capital		3,158	3,158
Earnings reinvested		940	939
Total Equity		4,462	4,461
Total Liabilities and Equity		11,243	11,243
LG And E And KU Energy LLC [Member]
Assets, Current [Abstract]
Cash and cash equivalents		22	24
Accounts receivable (less reserve:)
Customer		239	239
Other		60	63
Unbilled revenues		148	169
Fuel, materials and supplies		219	248
Prepayments		25	25
Regulatory assets		27	25
Total Current Assets		740	793
Property, Plant and Equipment
Regulated utility plant		13,806	13,721
Less: accumulated depreciation - regulated utility plant		2,146	2,125
Regulated utility plant, net		11,660	11,596
Construction work in progress		1,046	1,018
Property, Plant and Equipment, net		12,706	12,614
Other Noncurrent Assets
Regulatory assets		857	849
Goodwill		996	996
Other intangibles		75	78
Other noncurrent assets		136	82
Total Other Noncurrent Assets		2,064	2,005
Total Assets		15,510	15,412
Current Liabilities
Short-term debt		69	514
Long-term debt due within one year		202	530
Notes payable with affiliates		187	113
Accounts payable		278	366
Accounts payable to affiliates		17	9
Taxes		34	63
Price risk management liabilities		4	4
Interest		74	32
Customer deposits		63	61
Regulatory liabilities		40	48
Asset retirement obligations		73	82
Other current liabilities		122	126
Total Current Liabilities		1,163	1,948
Long-term Debt
Long-term debt		5,084	4,322
Long-term debt to affiliate		650	650
Long-term Debt		5,734	4,972
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		999	956
Investment tax credits		125	126
Accrued pension obligations		259	282
Asset retirement obligations		214	214
Regulatory liabilities		2,033	2,039
Price risk management liabilities		17	16
Other deferred credits and noncurrent liabilities		175	136
Total Deferred Credits and Other Noncurrent Liabilities		3,822	3,769
Commitments and Contingent Liabilities
Equity
Member's Equity		4,791	4,723
Total Liabilities and Equity		15,510	15,412
Louisville Gas And Electric Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		9	10
Accounts receivable (less reserve:)
Customer		110	110
Other		37	30
Accounts receivable from affiliates		28	24
Unbilled revenues		64	77
Fuel, materials and supplies		95	127
Prepayments		12	12
Regulatory assets		22	21
Total Current Assets		377	411
Property, Plant and Equipment
Regulated utility plant		5,861	5,816
Less: accumulated depreciation - regulated utility plant		777	741
Regulated utility plant, net		5,084	5,075
Construction work in progress		547	514
Property, Plant and Equipment, net		5,631	5,589
Other Noncurrent Assets
Regulatory assets		435	431
Goodwill		389	389
Other intangibles		45	47
Other noncurrent assets		41	16
Total Other Noncurrent Assets		910	883
Total Assets		6,918	6,883
Current Liabilities
Short-term debt		69	279
Long-term debt due within one year		106	434
Accounts payable		152	172
Accounts payable to affiliates		23	26
Taxes		14	26
Price risk management liabilities		4	4
Interest		24	11
Customer deposits		31	29
Regulatory liabilities		10	17
Asset retirement obligations		24	23
Other current liabilities		42	39
Total Current Liabilities		499	1,060
Long-term Debt
Long-term Debt		1,903	1,375
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		644	628
Investment tax credits		34	34
Asset retirement obligations		85	80
Regulatory liabilities		911	915
Price risk management liabilities		17	16
Other deferred credits and noncurrent liabilities		104	88
Total Deferred Credits and Other Noncurrent Liabilities		1,795	1,761
Commitments and Contingent Liabilities
Equity
Common stock	[3]	424	424
Additional paid-in capital		1,795	1,795
Earnings reinvested		502	468
Total Equity		2,721	2,687
Total Liabilities and Equity		6,918	6,883
Kentucky Utilities Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		13	14
Accounts receivable (less reserve:)
Customer		129	129
Other		22	34
Unbilled revenues		84	92
Fuel, materials and supplies		124	121
Prepayments		12	11
Regulatory assets		5	4
Total Current Assets		389	405
Property, Plant and Equipment
Regulated utility plant		7,935	7,895
Less: accumulated depreciation - regulated utility plant		1,367	1,382
Regulated utility plant, net		6,568	6,513
Construction work in progress		497	503
Property, Plant and Equipment, net		7,065	7,016
Other Noncurrent Assets
Regulatory assets		422	418
Goodwill		607	607
Other intangibles		30	31
Other noncurrent assets		96	63
Total Other Noncurrent Assets		1,155	1,119
Total Assets		8,609	8,540
Current Liabilities
Short-term debt		0	235
Long-term debt due within one year		96	96
Accounts payable		113	171
Accounts payable to affiliates		52	53
Taxes		21	24
Interest		38	16
Customer deposits		32	32
Regulatory liabilities		30	31
Asset retirement obligations		49	59
Other current liabilities		49	35
Total Current Liabilities		480	752
Long-term Debt
Long-term Debt		2,458	2,225
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		755	735
Investment tax credits		91	92
Asset retirement obligations		129	134
Regulatory liabilities		1,122	1,124
Other deferred credits and noncurrent liabilities		62	36
Total Deferred Credits and Other Noncurrent Liabilities		2,159	2,121
Commitments and Contingent Liabilities
Equity
Common stock	[4]	308	308
Additional paid-in capital		2,689	2,661
Earnings reinvested		515	473
Total Equity		3,512	3,442
Total Liabilities and Equity		$ 8,609	$ 8,540

[1] 1,560,000 shares authorized; 721,371 and 720,323 shares issued and outstanding at March 31, 2019 and December 31, 2018.

[2] 170,000 shares authorized; 66,368 shares issued and outstanding at March 31, 2019 and December 31, 2018.

[3] 75,000 shares authorized; 21,294 shares issued and outstanding at March 31, 2019 and December 31, 2018.

[4] 80,000 shares authorized; 37,818 shares issued and outstanding at March 31, 2019 and December 31, 2018.