CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions		Jun. 30, 2018	Dec. 31, 2017
Assets, Current [Abstract]
Cash and cash equivalents		$ 852	$ 485
Accounts receivable (less reserve:)
Customer		675	681
Other		66	100
Unbilled revenues		453	543
Fuel, materials and supplies		288	320
Prepayments		126	66
Price risk management assets		78	49
Regulatory assets		27	34
Other current assets		62	50
Total Current Assets		2,600	2,294
Property, Plant and Equipment
Regulated utility plant		38,999	38,228
Less: accumulated depreciation - regulated utility plant		7,083	6,785
Regulated utility plant, net		31,916	31,443
Non-regulated property, plant and equipment		370	384
Less: accumulated depreciation - non-regulated property, plant and equipment		108	110
Non-regulated property, plant and equipment, net		262	274
Construction work in progress		1,645	1,375
Property, Plant and Equipment, net		33,823	33,092
Other Noncurrent Assets
Regulatory assets		1,530	1,504
Goodwill		3,308	3,258
Other intangibles		694	697
Pension benefit asset		498	284
Price risk management assets		185	215
Other noncurrent assets		192	135
Total Other Noncurrent Assets		6,407	6,093
Total Assets		42,830	41,479
Current Liabilities
Short-term debt		1,864	1,080
Long-term debt due within one year		203	348
Accounts payable		804	924
Taxes		132	105
Interest		203	282
Dividends		287	273
Customer deposits		271	292
Regulatory liabilities		137	95
Other current liabilities		547	624
Total Current Liabilities		4,448	4,023
Long-term Debt
Long-term Debt		20,217	19,847
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		2,632	2,462
Investment tax credits		128	129
Accrued pension obligations		665	800
Asset retirement obligations		297	312
Regulatory liabilities		2,747	2,704
Other deferred credits and noncurrent liabilities		456	441
Total Deferred Credits and Other Noncurrent Liabilities		6,925	6,848
Commitments and Contingent Liabilities
Equity
Common stock	[1]	7	7
Additional paid-in capital		10,462	10,305
Earnings reinvested		4,266	3,871
Accumulated other comprehensive loss		(3,495)	(3,422)
Total Equity		11,240	10,761
Total Liabilities and Equity		42,830	41,479
PPL Electric Utilities Corp [Member]
Assets, Current [Abstract]
Cash and cash equivalents		489	49
Accounts receivable (less reserve:)
Customer		289	279
Other		23	71
Accounts receivable from affiliates		11	0
Unbilled revenues		97	127
Fuel, materials and supplies		28	34
Prepayments		53	6
Regulatory assets		16	16
Other current assets		13	6
Total Current Assets		1,019	588
Property, Plant and Equipment
Regulated utility plant		11,140	10,785
Less: accumulated depreciation - regulated utility plant		2,815	2,778
Regulated utility plant, net		8,325	8,007
Construction work in progress		586	508
Property, Plant and Equipment, net		8,911	8,515
Other Noncurrent Assets
Regulatory assets		737	709
Other intangibles		260	259
Other noncurrent assets		56	11
Total Other Noncurrent Assets		1,053	979
Total Assets		10,983	10,082
Current Liabilities
Accounts payable		374	386
Accounts payable to affiliates		29	31
Taxes		7	8
Interest		37	36
Regulatory liabilities		66	86
Other current liabilities		99	98
Total Current Liabilities		612	645
Long-term Debt
Long-term Debt		3,693	3,298
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		1,225	1,154
Accrued pension obligations		212	246
Regulatory liabilities		692	668
Other deferred credits and noncurrent liabilities		131	79
Total Deferred Credits and Other Noncurrent Liabilities		2,260	2,147
Commitments and Contingent Liabilities
Equity
Common stock	[2]	364	364
Additional paid-in capital		3,154	2,729
Earnings reinvested		900	899
Total Equity		4,418	3,992
Total Liabilities and Equity		10,983	10,082
LG And E And KU Energy LLC [Member]
Assets, Current [Abstract]
Cash and cash equivalents		39	30
Accounts receivable (less reserve:)
Customer		229	246
Other		45	44
Unbilled revenues		163	203
Fuel, materials and supplies		229	254
Prepayments		31	25
Regulatory assets		11	18
Other current assets		6	8
Total Current Assets		753	828
Property, Plant and Equipment
Regulated utility plant		13,346	13,187
Less: accumulated depreciation - regulated utility plant		1,955	1,785
Regulated utility plant, net		11,391	11,402
Construction work in progress		880	627
Property, Plant and Equipment, net		12,271	12,029
Other Noncurrent Assets
Regulatory assets		793	795
Goodwill		996	996
Other intangibles		82	86
Other noncurrent assets		75	68
Total Other Noncurrent Assets		1,946	1,945
Total Assets		14,970	14,802
Current Liabilities
Short-term debt		316	244
Long-term debt due within one year		203	98
Notes payable with affiliates		99	225
Accounts payable		266	338
Accounts payable to affiliates		8	7
Taxes		41	66
Price risk management liabilities		4	4
Interest		32	32
Customer deposits		59	58
Regulatory liabilities		71	9
Asset retirement obligations		84	85
Other current liabilities		124	161
Total Current Liabilities		1,307	1,327
Long-term Debt
Long-term debt		4,657	4,661
Long-term debt to affiliate		650	400
Long-term Debt		5,307	5,061
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		878	866
Investment tax credits		127	129
Accrued pension obligations		259	365
Asset retirement obligations		248	271
Regulatory liabilities		2,055	2,036
Price risk management liabilities		17	22
Other deferred credits and noncurrent liabilities		140	162
Total Deferred Credits and Other Noncurrent Liabilities		3,724	3,851
Commitments and Contingent Liabilities
Equity
Accumulated other comprehensive loss		(86)	(88)
Member's Equity		4,632	4,563
Total Liabilities and Equity		14,970	14,802
Louisville Gas And Electric Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		19	15
Accounts receivable (less reserve:)
Customer		104	116
Other		14	13
Accounts receivable from affiliates		18	24
Unbilled revenues		67	91
Fuel, materials and supplies		100	131
Prepayments		16	11
Regulatory assets		11	12
Other current assets		2	3
Total Current Assets		351	416
Property, Plant and Equipment
Regulated utility plant		5,653	5,587
Less: accumulated depreciation - regulated utility plant		678	614
Regulated utility plant, net		4,975	4,973
Construction work in progress		455	305
Property, Plant and Equipment, net		5,430	5,278
Other Noncurrent Assets
Regulatory assets		406	411
Goodwill		389	389
Other intangibles		50	53
Other noncurrent assets		23	12
Total Other Noncurrent Assets		868	865
Total Assets		6,649	6,559
Current Liabilities
Short-term debt		183	199
Long-term debt due within one year		194	98
Accounts payable		132	179
Accounts payable to affiliates		21	23
Taxes		23	25
Price risk management liabilities		4	4
Interest		11	11
Customer deposits		28	27
Regulatory liabilities		34	3
Asset retirement obligations		17	24
Other current liabilities		47	52
Total Current Liabilities		694	645
Long-term Debt
Long-term Debt		1,614	1,611
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		581	572
Investment tax credits		34	35
Accrued pension obligations		0	45
Asset retirement obligations		95	97
Regulatory liabilities		922	919
Price risk management liabilities		17	22
Other deferred credits and noncurrent liabilities		81	86
Total Deferred Credits and Other Noncurrent Liabilities		1,730	1,776
Commitments and Contingent Liabilities
Equity
Common stock	[3]	424	424
Additional paid-in capital		1,755	1,712
Earnings reinvested		432	391
Total Equity		2,611	2,527
Total Liabilities and Equity		6,649	6,559
Kentucky Utilities Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		20	15
Accounts receivable (less reserve:)
Customer		125	130
Other		31	30
Unbilled revenues		96	112
Fuel, materials and supplies		129	123
Prepayments		15	14
Regulatory assets		0	6
Other current assets		4	5
Total Current Assets		420	435
Property, Plant and Equipment
Regulated utility plant		7,683	7,592
Less: accumulated depreciation - regulated utility plant		1,275	1,170
Regulated utility plant, net		6,408	6,422
Construction work in progress		424	321
Property, Plant and Equipment, net		6,832	6,743
Other Noncurrent Assets
Regulatory assets		387	384
Goodwill		607	607
Other intangibles		32	33
Other noncurrent assets		75	52
Total Other Noncurrent Assets		1,101	1,076
Total Assets		8,353	8,254
Current Liabilities
Short-term debt		133	45
Long-term debt due within one year		9	0
Accounts payable		121	137
Accounts payable to affiliates		42	53
Taxes		23	19
Interest		16	16
Customer deposits		31	31
Regulatory liabilities		37	6
Asset retirement obligations		67	61
Other current liabilities		35	46
Total Current Liabilities		514	414
Long-term Debt
Long-term Debt		2,320	2,328
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		690	691
Investment tax credits		93	94
Accrued pension obligations		0	36
Asset retirement obligations		153	174
Regulatory liabilities		1,133	1,117
Other deferred credits and noncurrent liabilities		36	43
Total Deferred Credits and Other Noncurrent Liabilities		2,105	2,155
Commitments and Contingent Liabilities
Equity
Common stock	[4]	308	308
Additional paid-in capital		2,661	2,616
Earnings reinvested		445	433
Total Equity		3,414	3,357
Total Liabilities and Equity		$ 8,353	$ 8,254

[1] 1,560,000 shares authorized; 699,128 and 693,398 shares issued and outstanding at June 30, 2018 and December 31, 2017.

[2] 170,000 shares authorized; 66,368 shares issued and outstanding at June 30, 2018 and December 31, 2017.

[3] 75,000 shares authorized; 21,294 shares issued and outstanding at June 30, 2018 and December 31, 2017.

[4] 80,000 shares authorized; 37,818 shares issued and outstanding at June 30, 2018 and December 31, 2017.