CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Assets, Current [Abstract]
Cash and cash equivalents		$ 842	$ 485
Accounts receivable (less reserve:)
Customer		684	681
Other		58	100
Unbilled revenues		411	543
Fuel, materials and supplies		295	320
Prepayments		103	66
Price risk management assets		91	49
Regulatory assets		29	34
Other current assets		61	50
Total Current Assets		2,545	2,294
Property, Plant and Equipment
Regulated utility plant		39,144	38,228
Less: accumulated depreciation - regulated utility plant		7,196	6,785
Regulated utility plant, net		31,948	31,443
Non-regulated property, plant and equipment		365	384
Less: accumulated depreciation - non-regulated property, plant and equipment		111	110
Non-regulated property, plant and equipment, net		254	274
Construction work in progress		1,816	1,375
Property, Plant and Equipment, net		34,018	33,092
Other Noncurrent Assets
Regulatory assets		1,525	1,504
Goodwill		3,242	3,258
Other intangibles		700	697
Pension benefit asset		615	284
Price risk management assets		206	215
Other noncurrent assets		191	135
Total Other Noncurrent Assets		6,479	6,093
Total Assets		43,042	41,479
Current Liabilities
Short-term debt		1,549	1,080
Long-term debt due within one year		330	348
Accounts payable		814	924
Taxes		121	105
Interest		326	282
Dividends		287	273
Customer deposits		265	292
Regulatory liabilities		136	95
Other current liabilities		555	624
Total Current Liabilities		4,383	4,023
Long-term Debt
Long-term Debt		19,924	19,847
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		2,717	2,462
Investment tax credits		127	129
Accrued pension obligations		649	800
Asset retirement obligations		279	312
Regulatory liabilities		2,739	2,704
Other deferred credits and noncurrent liabilities		441	441
Total Deferred Credits and Other Noncurrent Liabilities		6,952	6,848
Commitments and Contingent Liabilities
Equity
Common stock	[1]	7	7
Additional paid-in capital		11,001	10,305
Earnings reinvested		4,423	3,871
Accumulated other comprehensive loss		(3,648)	(3,422)
Total Equity		11,783	10,761
Total Liabilities and Equity		43,042	41,479
PPL Electric Utilities Corp [Member]
Assets, Current [Abstract]
Cash and cash equivalents		414	49
Accounts receivable (less reserve:)
Customer		309	279
Other		18	71
Accounts receivable from affiliates		11	0
Unbilled revenues		82	127
Fuel, materials and supplies		26	34
Prepayments		31	6
Regulatory assets		18	16
Other current assets		10	6
Total Current Assets		919	588
Property, Plant and Equipment
Regulated utility plant		11,332	10,785
Less: accumulated depreciation - regulated utility plant		2,848	2,778
Regulated utility plant, net		8,484	8,007
Construction work in progress		643	508
Property, Plant and Equipment, net		9,127	8,515
Other Noncurrent Assets
Regulatory assets		738	709
Other intangibles		260	259
Other noncurrent assets		52	11
Total Other Noncurrent Assets		1,050	979
Total Assets		11,096	10,082
Current Liabilities
Accounts payable		384	386
Accounts payable to affiliates		25	31
Taxes		7	8
Interest		43	36
Regulatory liabilities		72	86
Other current liabilities		99	98
Total Current Liabilities		630	645
Long-term Debt
Long-term Debt		3,693	3,298
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		1,258	1,154
Accrued pension obligations		210	246
Regulatory liabilities		686	668
Other deferred credits and noncurrent liabilities		135	79
Total Deferred Credits and Other Noncurrent Liabilities		2,289	2,147
Commitments and Contingent Liabilities
Equity
Common stock	[2]	364	364
Additional paid-in capital		3,158	2,729
Earnings reinvested		962	899
Total Equity		4,484	3,992
Total Liabilities and Equity		11,096	10,082
LG And E And KU Energy LLC [Member]
Assets, Current [Abstract]
Cash and cash equivalents		29	30
Accounts receivable (less reserve:)
Customer		230	246
Other		47	44
Unbilled revenues		149	203
Fuel, materials and supplies		238	254
Prepayments		32	25
Regulatory assets		11	18
Other current assets		7	8
Total Current Assets		743	828
Property, Plant and Equipment
Regulated utility plant		13,438	13,187
Less: accumulated depreciation - regulated utility plant		2,031	1,785
Regulated utility plant, net		11,407	11,402
Construction work in progress		1,000	627
Property, Plant and Equipment, net		12,407	12,029
Other Noncurrent Assets
Regulatory assets		787	795
Goodwill		996	996
Other intangibles		80	86
Other noncurrent assets		75	68
Total Other Noncurrent Assets		1,938	1,945
Total Assets		15,088	14,802
Current Liabilities
Short-term debt		304	244
Long-term debt due within one year		330	98
Notes payable with affiliates		80	225
Accounts payable		271	338
Accounts payable to affiliates		14	7
Taxes		55	66
Price risk management liabilities		4	4
Interest		73	32
Customer deposits		60	58
Regulatory liabilities		64	9
Asset retirement obligations		86	85
Other current liabilities		127	161
Total Current Liabilities		1,468	1,327
Long-term Debt
Long-term debt		4,521	4,661
Long-term debt to affiliate		650	400
Long-term Debt		5,171	5,061
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		922	866
Investment tax credits		127	129
Accrued pension obligations		256	365
Asset retirement obligations		231	271
Regulatory liabilities		2,053	2,036
Price risk management liabilities		15	22
Other deferred credits and noncurrent liabilities		137	162
Total Deferred Credits and Other Noncurrent Liabilities		3,741	3,851
Commitments and Contingent Liabilities
Equity
Accumulated other comprehensive loss		(84)	(88)
Member's Equity		4,708	4,563
Total Liabilities and Equity		15,088	14,802
Louisville Gas And Electric Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		11	15
Accounts receivable (less reserve:)
Customer		102	116
Other		13	13
Accounts receivable from affiliates		22	24
Unbilled revenues		61	91
Fuel, materials and supplies		122	131
Prepayments		14	11
Regulatory assets		11	12
Other current assets		3	3
Total Current Assets		359	416
Property, Plant and Equipment
Regulated utility plant		5,684	5,587
Less: accumulated depreciation - regulated utility plant		707	614
Regulated utility plant, net		4,977	4,973
Construction work in progress		520	305
Property, Plant and Equipment, net		5,497	5,278
Other Noncurrent Assets
Regulatory assets		400	411
Goodwill		389	389
Other intangibles		49	53
Other noncurrent assets		27	12
Total Other Noncurrent Assets		865	865
Total Assets		6,721	6,559
Current Liabilities
Short-term debt		176	199
Long-term debt due within one year		234	98
Accounts payable		152	179
Accounts payable to affiliates		22	23
Taxes		29	25
Price risk management liabilities		4	4
Interest		24	11
Customer deposits		28	27
Regulatory liabilities		26	3
Asset retirement obligations		21	24
Other current liabilities		39	52
Total Current Liabilities		755	645
Long-term Debt
Long-term Debt		1,574	1,611
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		611	572
Investment tax credits		35	35
Accrued pension obligations		0	45
Asset retirement obligations		86	97
Regulatory liabilities		920	919
Price risk management liabilities		15	22
Other deferred credits and noncurrent liabilities		80	86
Total Deferred Credits and Other Noncurrent Liabilities		1,747	1,776
Commitments and Contingent Liabilities
Equity
Common stock	[3]	424	424
Additional paid-in capital		1,755	1,712
Earnings reinvested		466	391
Total Equity		2,645	2,527
Total Liabilities and Equity		6,721	6,559
Kentucky Utilities Co [Member]
Assets, Current [Abstract]
Cash and cash equivalents		18	15
Accounts receivable (less reserve:)
Customer		128	130
Other		25	30
Unbilled revenues		88	112
Fuel, materials and supplies		116	123
Prepayments		17	14
Regulatory assets		0	6
Other current assets		4	5
Total Current Assets		396	435
Property, Plant and Equipment
Regulated utility plant		7,746	7,592
Less: accumulated depreciation - regulated utility plant		1,323	1,170
Regulated utility plant, net		6,423	6,422
Construction work in progress		479	321
Property, Plant and Equipment, net		6,902	6,743
Other Noncurrent Assets
Regulatory assets		387	384
Goodwill		607	607
Other intangibles		31	33
Other noncurrent assets		77	52
Total Other Noncurrent Assets		1,102	1,076
Total Assets		8,400	8,254
Current Liabilities
Short-term debt		128	45
Long-term debt due within one year		96	0
Accounts payable		105	137
Accounts payable to affiliates		47	53
Taxes		30	19
Interest		37	16
Customer deposits		32	31
Regulatory liabilities		38	6
Asset retirement obligations		65	61
Other current liabilities		43	46
Total Current Liabilities		621	414
Long-term Debt
Long-term Debt		2,224	2,328
Deferred Credits and Other Noncurrent Liabilities
Deferred income taxes		719	691
Investment tax credits		92	94
Accrued pension obligations		0	36
Asset retirement obligations		145	174
Regulatory liabilities		1,133	1,117
Other deferred credits and noncurrent liabilities		35	43
Total Deferred Credits and Other Noncurrent Liabilities		2,124	2,155
Commitments and Contingent Liabilities
Equity
Common stock	[4]	308	308
Additional paid-in capital		2,661	2,616
Earnings reinvested		462	433
Total Equity		3,431	3,357
Total Liabilities and Equity		$ 8,400	$ 8,254

[1] 1,560,000 shares authorized; 719,702 and 693,398 shares issued and outstanding at September 30, 2018 and December 31, 2017.

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

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

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