PPL (PPL) 10-Q 6 May 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Document Entity Information [Line Items]
Entity Shell Company	false
Entity Interactive Data Current	Yes
Entity File Number	1-11459
Entity Incorporation, State or Country Code	PA
Entity Address, Address Line One	Two North Ninth Street
Entity Address, City or Town	Allentown,
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	18101-1179
City Area Code	(610)
Local Phone Number	774-5151
Document Type	10-Q
Document Period End Date	Mar. 31, 2021
Amendment Flag	false
Entity Registrant Name	PPL Corporation
Entity Tax Identification Number	23-2758192
Entity Central Index Key	0000922224
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		769,427,879
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Document Quarterly Report	true
Document Transition Report	false
Common Stock [Member]
Document Entity Information [Line Items]
Title of 12(b) Security	Common Stock of PPL Corporation
Trading Symbol	PPL
Security Exchange Name	NYSE
2013 Series B Junior Subordinated Notes due 2073 [Member]
Document Entity Information [Line Items]
Title of 12(b) Security	2013 Series B due 2073
Trading Symbol	PPX
Security Exchange Name	NYSE
2007 Series A Junior Subordinated Notes due 2067 [Member]
Document Entity Information [Line Items]
Title of 12(b) Security	2007 Series A due 2067
Trading Symbol	PPL/67
Security Exchange Name	NYSE
PPL Electric Utilities Corp [Member]
Document Entity Information [Line Items]
Entity Shell Company	false
Entity Interactive Data Current	Yes
Entity File Number	1-905
Entity Incorporation, State or Country Code	PA
Entity Address, Address Line One	Two North Ninth Street
Entity Address, City or Town	Allentown,
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	18101-1179
City Area Code	(610)
Local Phone Number	774-5151
Amendment Flag	false
Entity Registrant Name	PPL Electric Utilities Corporation
Entity Tax Identification Number	23-0959590
Entity Central Index Key	0000317187
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		66,368,056
LG And E And KU Energy LLC [Member]
Document Entity Information [Line Items]
Entity Shell Company	false
Entity Interactive Data Current	Yes
Entity File Number	333-173665
Entity Incorporation, State or Country Code	KY
Entity Address, Address Line One	220 West Main Street
Entity Address, City or Town	Louisville,
Entity Address, State or Province	KY
Entity Address, Postal Zip Code	40202-1377
City Area Code	(502)
Local Phone Number	627-2000
Amendment Flag	false
Entity Registrant Name	LG&E and KU Energy LLC
Entity Tax Identification Number	20-0523163
Entity Central Index Key	0001518339
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Louisville Gas And Electric Co [Member]
Document Entity Information [Line Items]
Entity Shell Company	false
Entity Interactive Data Current	Yes
Entity File Number	1-2893
Entity Incorporation, State or Country Code	KY
Entity Address, Address Line One	220 West Main Street
Entity Address, City or Town	Louisville,
Entity Address, State or Province	KY
Entity Address, Postal Zip Code	40202-1377
City Area Code	(502)
Local Phone Number	627-2000
Amendment Flag	false
Entity Registrant Name	Louisville Gas and Electric Company
Entity Tax Identification Number	61-0264150
Entity Central Index Key	0000060549
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		21,294,223
Kentucky Utilities Co [Member]
Document Entity Information [Line Items]
Entity Shell Company	false
Entity Interactive Data Current	Yes
Entity File Number	1-3464
Entity Incorporation, State or Country Code	KY
Entity Incorporation, State or Country Code	VA
Entity Address, Address Line One	One Quality Street
Entity Address, City or Town	Lexington,
Entity Address, State or Province	KY
Entity Address, Postal Zip Code	40507-1462
City Area Code	(502)
Local Phone Number	627-2000
Amendment Flag	false
Entity Registrant Name	Kentucky Utilities Company
Entity Tax Identification Number	61-0247570
Entity Central Index Key	0000055387
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		37,817,878

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Operating Revenues
Operating Revenues		$ 1,498	$ 1,440
Operation
Fuel		177	163
Energy purchases		220	201
Other operation and maintenance		367	355
Depreciation		267	250
Taxes, other than income		52	47
Total Operating Expenses		1,083	1,016
Operating Income		415	424
Other Income (Expense) - net		0	(5)
Interest Expense		153	154
Income from Continuing Operations Before Income Taxes		262	265
Income Taxes		59	61
Income from continuing operations after income taxes		203	204
Income (Loss) from Discontinued Operations (net of income taxes)		(2,043)	350
Net Income (Loss)		$ (1,840)	$ 554
Net Income:
Income (Loss) from Continuing Operations After Income Taxes		$ 0.26	$ 0.27
Income (loss) from Discontinued Operations (net of income taxes)		(2.65)	0.45
Net Income (Loss) Available to PPL Common Shareowners		$ (2.39)	$ 0.72
Weighted-Average Shares of Common Stock Outstanding (in thousands)
Basic (in shares)		769,159	767,948
Diluted (in shares)		770,710	768,738
PPL Electric Utilities Corp [Member]
Operating Revenues
Operating Revenues		$ 605	$ 608
Operation
Energy purchases		149	144
Other operation and maintenance		128	137
Depreciation		108	98
Taxes, other than income		32	30
Total Operating Expenses		417	409
Operating Income		188	199
Other Income (Expense) - net		5	3
Interest Income from Affiliate		0	1
Interest Expense		43	44
Income from Continuing Operations Before Income Taxes		150	159
Income Taxes		37	41
Net Income (Loss)	[1]	113	118
LG And E And KU Energy LLC [Member]
Operating Revenues
Operating Revenues		885	825
Operation
Fuel		177	163
Energy purchases		71	57
Other operation and maintenance		220	204
Depreciation		156	149
Taxes, other than income		21	18
Total Operating Expenses		645	591
Operating Income		240	234
Interest Expense		51	58
Interest Expense with Affiliate		13	7
Income from Continuing Operations Before Income Taxes		176	169
Income Taxes		30	34
Net Income (Loss)	[2]	146	135
Louisville Gas And Electric Co [Member]
Operating Revenues
Retail and wholesale		421	393
Electric revenue from affiliate		7	14
Operating Revenues		428	407
Operation
Fuel		67	74
Energy purchases		66	52
Energy purchases from affiliate		5	0
Other operation and maintenance		96	92
Depreciation		66	64
Taxes, other than income		11	10
Total Operating Expenses		311	292
Operating Income		117	115
Other Income (Expense) - net		(2)	(1)
Interest Expense		21	22
Income from Continuing Operations Before Income Taxes		94	92
Income Taxes		19	19
Net Income (Loss)	[3]	75	73
Kentucky Utilities Co [Member]
Operating Revenues
Retail and wholesale		464	432
Electric revenue from affiliate		5	0
Operating Revenues		469	432
Operation
Fuel		110	89
Energy purchases		5	5
Energy purchases from affiliate		7	14
Other operation and maintenance		115	104
Depreciation		89	84
Taxes, other than income		10	9
Total Operating Expenses		336	305
Operating Income		133	127
Other Income (Expense) - net		1	1
Interest Expense		27	28
Income from Continuing Operations Before Income Taxes		107	100
Income Taxes		21	20
Net Income (Loss)	[4]	$ 86	$ 80
[1]	Net income equals comprehensive income.
[2]	Net income approximates comprehensive income.
[3]	Net income equals comprehensive income.
[4]	Net income equals comprehensive income.

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Net income (loss)		$ (1,840)	$ 554
Amounts arising during the period - gains (losses), net of tax (expense) benefit:
Foreign currency translation adjustments, net of tax		303	(61)
Qualifying derivatives, net of tax		(30)	8
Reclassifications from AOCI - (gains) losses, net of tax expense (benefit):
Qualifying derivatives, net of tax		25	(3)
Other Comprehensive (Income) Loss, Defined Benefit Plans, after Reclassification Adjustment, after Tax [Abstract]
Defined benefit plans, Prior service costs, net of tax		0	1
Defined benefit plans, Net actuarial (gain) loss, net of tax		40	47
Total other comprehensive income (loss)		338	(8)
Comprehensive income (loss)		(1,502)	546
LG And E And KU Energy LLC [Member]
Net income (loss)	[1]	146	135
Other Comprehensive (Income) Loss, Defined Benefit Plans, after Reclassification Adjustment, after Tax [Abstract]
Total other comprehensive income (loss)		$ 3	$ 1
[1]	Net income approximates comprehensive income.

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Tax effect of foreign currency translation adjustments arising during the period	$ (80)	$ 0
Tax effect of qualifying derivatives arising during the period	16	(2)
Tax effect of qualifying derivatives reclassified from AOCI	(14)	0
Other Comprehensive (Income) Loss, Defined Benefit Plans, Prior Service Costs (Credit), Reclassification Adjustment from AOCI, Tax	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plans, Net Actuarial Gain(Loss), Reclassification Adjustment from AOCI, Tax	$ (22)	$ (12)

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Cash Flows from Operating Activities
Net income (loss)		$ (1,840)	$ 554
Loss (income) from discontinued operations (net of income taxes)		2,043	(350)
Income from continuing operations (net of income taxes)		203	204
Depreciation		267	250
Amortization		11	9
Defined benefit plans - (income) expense		4	9
Deferred income taxes and investment tax credits		50	75
Unrealized (gains) losses on derivatives, and other hedging activities		0	(4)
Stock-based compensation expense		6	6
Other		(5)	1
Change in current assets and current liabilities
Accounts receivable		(60)	0
Accounts payable		(42)	(42)
Unbilled revenues		76	62
Fuel, materials and supplies		41	12
Prepayments		(76)	(75)
Regulatory assets and liabilities, net		29	(25)
Accrued interest		69	66
Other current liabilities		(103)	(132)
Other		2	22
Other operating activities
Defined benefit plans - funding		(33)	(54)
Other assets		(74)	42
Other liabilities		31	(13)
Net cash provided by operating activities - continuing operations		396	413
Net cash provided by operating activities - discontinued operations		267	279
Net cash provided by operating activities		663	692
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(471)	(616)
Other investing activities		(1)	(3)
Net cash used in investing activities - continuing operations		(472)	(619)
Net cash used in investing activities - discontinued operations		(263)	(214)
Net cash used in investing activities		(735)	(833)
Cash Flows from Financing Activities
Proceeds from project financing		5	0
Issuance of common stock		1	20
Payment of common stock dividends		(320)	(317)
Issuance of term loan		0	200
Retirement of term loan		(300)	0
Retirement of commercial paper		(73)	0
Net increase (decrease) in short-term debt		752	388
Other financing activities		(10)	(8)
Net cash provided by financing activities - continuing operations		55	283
Net cash used in financing activities - discontinued operations		(126)	(43)
Net cash provided by (used in) financing activities		(71)	240
Effect of Exchange Rates on Cash, Cash Equivalents and Restricted Cash included in Discontinued Operations		8	1
Net (Increase) Decrease in Cash, Cash Equivalents and Restricted Cash included in Discontinued Operations		114	(23)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		(21)	77
Cash and Cash Equivalents at Beginning of Period		442
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		443	660
Cash and Cash Equivalents at End of Period		421
Cash, Cash Equivalents and Restricted Cash at End of Period		422	737
Supplemental Disclosures of Cash Flow Information
Accrued expenditures for property, plant and equipment at March 31,		229	237
PPL Electric Utilities Corp [Member]
Cash Flows from Operating Activities
Net income (loss)	[1]	113	118
Depreciation		108	98
Amortization		6	5
Defined benefit plans - (income) expense		(3)	(1)
Deferred income taxes and investment tax credits		13	32
Other		(4)	9
Change in current assets and current liabilities
Accounts receivable		(37)	(26)
Accounts payable		(9)	(20)
Unbilled revenues		37	34
Prepayments		(78)	(76)
Regulatory assets and liabilities, net		39	(11)
Other		(14)	(21)
Other operating activities
Defined benefit plans - funding		(21)	(21)
Other assets		(27)	4
Other liabilities		(2)	8
Net cash provided by operating activities		121	132
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(223)	(280)
Expenditures for intangible assets		(1)	(1)
Other investing activities		2	0
Net cash used in investing activities		(222)	(281)
Cash Flows from Financing Activities
Payment of common stock dividends to parent		(115)	(165)
Net increase (decrease) in short-term debt		205	85
Net cash provided by (used in) financing activities		90	(80)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		(11)	(229)
Cash and Cash Equivalents at Beginning of Period		40
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		40	264
Cash and Cash Equivalents at End of Period		29
Cash, Cash Equivalents and Restricted Cash at End of Period		29	35
Supplemental Disclosures of Cash Flow Information
Accrued expenditures for property, plant and equipment at March 31,		143	158
LG And E And KU Energy LLC [Member]
Cash Flows from Operating Activities
Net income (loss)	[2]	146	135
Depreciation		156	149
Amortization		4	4
Defined benefit plans - (income) expense		5	5
Deferred income taxes and investment tax credits		20	31
Change in current assets and current liabilities
Accounts receivable		3	20
Accounts payable		(4)	(18)
Accounts payable to affiliates		9	1
Unbilled revenues		39	27
Fuel, materials and supplies		42	24
Regulatory assets and liabilities, net		(10)	(14)
Taxes payable		(18)	(27)
Accrued interest		45	51
Other		(51)	(37)
Other operating activities
Defined benefit plans - funding		(2)	(23)
Expenditures for asset retirement obligations		(15)	(15)
Other assets		1	1
Other liabilities		6	6
Net cash provided by operating activities		376	320
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(238)	(255)
Net cash used in investing activities		(238)	(255)
Cash Flows from Financing Activities
Net increase in notes payable with affiliate		(24)	92
Distributions to member		(62)	(52)
Retirement of commercial paper		(73)	0
Net increase (decrease) in short-term debt		8	(85)
Net cash provided by (used in) financing activities		(151)	(45)
Cash and Cash Equivalents, Period Increase (Decrease)		(13)	20
Cash and Cash Equivalents at Beginning of Period		29	27
Cash and Cash Equivalents at End of Period		16	47
Supplemental Disclosures of Cash Flow Information
Accrued expenditures for property, plant and equipment at March 31,		86	78
Louisville Gas And Electric Co [Member]
Cash Flows from Operating Activities
Net income (loss)	[3]	75	73
Depreciation		66	64
Amortization		2	2
Defined benefit plans - (income) expense		1	1
Deferred income taxes and investment tax credits		(1)	1
Change in current assets and current liabilities
Accounts receivable		(1)	14
Accounts receivable from affiliates		(3)	(6)
Accounts payable		8	(12)
Accounts payable to affiliates		(5)	(4)
Unbilled revenues		19	11
Fuel, materials and supplies		28	27
Regulatory assets and liabilities, net		(10)	(2)
Taxes payable		4	2
Accrued interest		18	18
Other		(17)	(10)
Other operating activities
Defined benefit plans - funding		(1)	(4)
Expenditures for asset retirement obligations		(6)	(4)
Other assets		0	(1)
Other liabilities		4	1
Net cash provided by operating activities		181	171
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(111)	(117)
Net cash used in investing activities		(111)	(117)
Cash Flows from Financing Activities
Net increase in notes payable with affiliate		0	21
Retirement of commercial paper		(41)	0
Payment of common stock dividends to parent		(60)	(29)
Net increase (decrease) in short-term debt		31	(79)
Contributions from parent		0	25
Net cash provided by (used in) financing activities		(70)	(62)
Cash and Cash Equivalents, Period Increase (Decrease)		0	(8)
Cash and Cash Equivalents at Beginning of Period		7	15
Cash and Cash Equivalents at End of Period		7	7
Supplemental Disclosures of Cash Flow Information
Accrued expenditures for property, plant and equipment at March 31,		46	39
Kentucky Utilities Co [Member]
Cash Flows from Operating Activities
Net income (loss)	[4]	86	80
Depreciation		89	84
Amortization		2	3
Deferred income taxes and investment tax credits		(2)	4
Change in current assets and current liabilities
Accounts receivable		2	6
Accounts receivable from affiliates		1	0
Accounts payable		(7)	(2)
Accounts payable to affiliates		2	(3)
Unbilled revenues		20	16
Fuel, materials and supplies		15	(3)
Regulatory assets and liabilities, net		0	(12)
Taxes payable		13	6
Accrued interest		25	25
Other		(17)	(4)
Other operating activities
Defined benefit plans - funding		0	(1)
Expenditures for asset retirement obligations		(9)	(11)
Other assets		0	3
Other liabilities		4	2
Net cash provided by operating activities		224	193
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(127)	(138)
Net (increase) decrease in notes receivable from affiliate		0	(21)
Net cash used in investing activities		(127)	(159)
Cash Flows from Financing Activities
Retirement of commercial paper		(32)	0
Payment of common stock dividends to parent		(56)	(37)
Net increase (decrease) in short-term debt		(23)	(6)
Contributions from parent		0	37
Net cash provided by (used in) financing activities		(111)	(6)
Cash and Cash Equivalents, Period Increase (Decrease)		(14)	28
Cash and Cash Equivalents at Beginning of Period		22	12
Cash and Cash Equivalents at End of Period		8	40
Supplemental Disclosures of Cash Flow Information
Accrued expenditures for property, plant and equipment at March 31,		$ 40	$ 39
[1]	Net income equals comprehensive income.
[2]	Net income approximates comprehensive income.
[3]	Net income equals comprehensive income.
[4]	Net income equals comprehensive income.

CONDENSED CONSOLIDATED BALANCE

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.

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) shares in Thousands, $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Receivables, Net, Current [Abstract]
Accounts receivable reserve for doubtful accounts	$ 72	$ 71
Unbilled revenues, reserve	$ 3	$ 4
Equity
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock shares authorized (in shares)	1,560,000	1,560,000
Common stock shares issued (in shares)	769,427	768,907
Common stock shares outstanding (in shares)	769,427	768,907
PPL Electric Utilities Corp [Member]
Receivables, Net, Current [Abstract]
Accounts receivable reserve for doubtful accounts	$ 41	$ 41
Unbilled revenues, reserve	$ 1	$ 2
Equity
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock shares authorized (in shares)	170,000	170,000
Common stock shares issued (in shares)	66,368	66,368
Common stock shares outstanding (in shares)	66,368	66,368
LG And E And KU Energy LLC [Member]
Receivables, Net, Current [Abstract]
Accounts receivable reserve for doubtful accounts	$ 30	$ 30
Unbilled revenues, reserve	2	2
Louisville Gas And Electric Co [Member]
Receivables, Net, Current [Abstract]
Accounts receivable reserve for doubtful accounts	2	2
Unbilled revenues, reserve	$ 1	$ 1
Equity
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock shares authorized (in shares)	75,000	75,000
Common stock shares issued (in shares)	21,294	21,294
Common stock shares outstanding (in shares)	21,294	21,294
Kentucky Utilities Co [Member]
Receivables, Net, Current [Abstract]
Accounts receivable reserve for doubtful accounts	$ 1	$ 1
Unbilled revenues, reserve	$ 1		$ 1
Equity
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock shares authorized (in shares)	80,000	80,000
Common stock shares issued (in shares)	37,818	37,818
Common stock shares outstanding (in shares)	37,818	37,818

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - USD ($) $ in Millions		Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock [Member]		Additional Paid-in Capital [Member]	Earnings Reinvested [Member]	Earnings Reinvested [Member]Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss [Member]	PPL Electric Utilities Corp [Member]		PPL Electric Utilities Corp [Member]Common Stock [Member]		PPL Electric Utilities Corp [Member]Additional Paid-in Capital [Member]	PPL Electric Utilities Corp [Member]Earnings Reinvested [Member]	LG And E And KU Energy LLC [Member]		Louisville Gas And Electric Co [Member]		Louisville Gas And Electric Co [Member]Common Stock [Member]		Louisville Gas And Electric Co [Member]Additional Paid-in Capital [Member]	Louisville Gas And Electric Co [Member]Earnings Reinvested [Member]	Kentucky Utilities Co [Member]		Kentucky Utilities Co [Member]Common Stock [Member]		Kentucky Utilities Co [Member]Additional Paid-in Capital [Member]	Kentucky Utilities Co [Member]Earnings Reinvested [Member]
Dividends Declared Per Share of Common Stock (in dollars per share)		$ 0.415
Balance at beginning of period - shares at Dec. 31, 2019				767,233,000	[1]							66,368,000	[2]							21,294,000	[3]					37,818,000	[4]
Balance at beginning of period at Dec. 31, 2019		$ 12,991		$ 8		$ 12,214	$ 5,127		$ (4,358)	$ 4,832		$ 364		$ 3,558	$ 910			$ 2,762		$ 424		$ 1,820	$ 518	$ 3,574		$ 308		$ 2,729	$ 537
Balance at beginning of period at Dec. 31, 2019																$ 4,942
Common stock shares issued	[1]			1,033,000
Common stock issued		34				34
Stock-based compensation		(9)				(9)
Net income (loss)		554					554			118	[5]				118	135	[6]	73	[7]				73	80	[8]				80
Capital contributions from parent																		25				25		37				37
Dividends and dividend equivalents	[9]	(319)					(319)
Dividends declared on common stock										(165)					(165)			(29)					(29)	(37)					(37)
Distributions to member																(52)
Other comprehensive income (loss)		(8)							(8)							1
Balance at end of period - shares at Mar. 31, 2020				768,266,000	[1]							66,368,000	[2]							21,294,000	[3]					37,818,000	[4]
Balance at end of period at Mar. 31, 2020		$ 13,241		$ 8		12,239	5,360		(4,366)	$ 4,785		$ 364		3,558	863			2,831		$ 424		1,845	562	3,654		$ 308		2,766	580
Balance at end of period at Mar. 31, 2020																5,026
Contributions from parent																		$ 25						$ 37
Cumulative Effect of New Accounting Principle in Period of Adoption			$ (2)					$ (2)
Dividends Declared Per Share of Common Stock (in dollars per share)		$ 0.415
Balance at beginning of period - shares at Dec. 31, 2020		768,907,000		768,907,000	[1]					66,368,000		66,368,000	[2]					21,294,000		21,294,000	[3]			37,818,000		37,818,000	[4]
Balance at beginning of period at Dec. 31, 2020		$ 13,373		$ 8		12,270	5,315		(4,220)	$ 5,124		$ 364		3,753	1,007			$ 2,948		$ 424		1,923	601	$ 3,782		$ 308		2,857	617
Balance at beginning of period at Dec. 31, 2020																5,116
Common stock shares issued		0		520,000
Common stock issued		$ 16				16
Stock-based compensation		(13)				(13)
Net income (loss)		(1,840)					(1,840)			113	[5]				113	146	[6]	75	[7]				75	86	[8]				86
Dividends and dividend equivalents	[9]	(320)					(320)
Dividends declared on common stock										$ (115)					(115)			$ (60)					(60)	$ (56)					(56)
Distributions to member																(62)
Other comprehensive income (loss)		$ 338							338							3
Balance at end of period - shares at Mar. 31, 2021		769,427,000		769,427,000						66,368,000		66,368,000	[2]					21,294,000		21,294,000	[3]			37,818,000		37,818,000	[4]
Balance at end of period at Mar. 31, 2021		$ 11,554		$ 8		$ 12,273	$ 3,155		$ (3,882)	$ 5,122		$ 364		$ 3,753	$ 1,005			$ 2,963		$ 424		$ 1,923	$ 616	$ 3,812		$ 308		$ 2,857	$ 647
Balance at end of period at Mar. 31, 2021																$ 5,203
Contributions from parent																		$ 0						$ 0
[1]	Shares in thousands. Each share entitles the holder to one vote on any question presented at any shareowners' meeting.
[2]	Shares in thousands. All common shares of PPL Electric stock are owned by PPL.
[3]	Shares in thousands. All common shares of LG&E stock are owned by LKE.
[4]	Shares in thousands. All common shares of KU stock are owned by LKE.
[5]	Net income equals comprehensive income.
[6]	Net income approximates comprehensive income.
[7]	Net income equals comprehensive income.
[8]	Net income equals comprehensive income.
[9]	Dividends declared per share of common stock were $0.415 for the three months ended March 31, 2021 and March 31, 2020.

CONDENSED CONSOLIDATED STATEM_6

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) (Parenthetical) - vote	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Vote per share of PPL's common stock	1	1

Segment and Related Information

Segment and Related Information	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Segment and Related Information	3. Segment and Related Information (PPL) See Note 2 in PPL's 2020 Form 10-K for a discussion of reportable segments and related information. On March 17, 2021, PPL WPD Limited entered into a share purchase agreement to sell PPL's U.K. utility business, which substantially represents PPL's U.K. Regulated segment. As a result of this strategic shift in the operations of the business, PPL will no longer provide segment information for the U.K. Regulated segment. See Note 9 for additional information . Income Statement data for the segments and reconciliation to PPL's consolidated results for the periods ended March 31 are as follows: Three Months 2021 2020 Operating Revenues from external customers Kentucky Regulated $ 885 $ 825 Pennsylvania Regulated 605 608 Corporate and Other 8 7 Total $ 1,498 $ 1,440 Net Income Kentucky Regulated (a) $ 146 $ 127 Pennsylvania Regulated (a) 113 118 Corporate and Other (a) (56) (41) Discontinued Operations (b) (2,043) 350 Total $ (1,840) $ 554 (a) For the period ended March 31, 2020, corporate level financing costs of $8 million, net of $2 million of income taxes, and an immaterial amount were allocated to the Kentucky Regulated and Pennsylvania Regulated segments. Beginning in 2021, corporate level financing costs will no longer be allocated to the reportable segments and are being reported in Corporate and Other. (b) Includes unrealized gains and losses from hedging foreign currency economic activity. See Note 9 for additional information. The following provides Balance Sheet data for the segments and reconciliation to PPL's consolidated Balance Sheets as of: March 31, December 31, Assets Kentucky Regulated $ 15,904 $ 15,943 Pennsylvania Regulated 12,585 12,347 Corporate and Other (a) 867 843 Assets Held for Sale (b) 18,425 18,983 Total $ 47,781 $ 48,116 (a) Primarily consists of unallocated items, including cash, PP&E, goodwill, the elimination of inter-segment transactions as well as the assets of Safari Energy. (b) See Note 9 for additional information. (PPL Electric, LKE, LG&E and KU)

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Earnings Per Share	5. Earnings Per Share (PPL) Basic EPS is computed by dividing income available to PPL common shareowners by the weighted-average number of common shares outstanding during the applicable period. Diluted EPS is computed by dividing income available to PPL common shareowners by the weighted-average number of common shares outstanding, increased by incremental shares that would be outstanding if potentially dilutive share-based payment awards were converted to common shares as calculated using the Two-Class Method or Treasury Stock Method. Reconciliations of the amounts of income and shares of PPL common stock (in thousands) for the periods ended March 31 used in the EPS calculation are: Three Months 2021 2020 Income (Numerator) Income from continuing operations after income taxes available to PPL common shareowners - Basic and Diluted $ 203 $ 204 Income (loss) from discontinued operations (net of income taxes) available to PPL common shareowners - Basic and Diluted $ (2,043) $ 350 Net income (loss) available to PPL common shareowners - Basic and Diluted $ (1,840) $ 554 Shares of Common Stock (Denominator) Weighted-average shares - Basic EPS 769,159 767,948 Add: Dilutive share-based payment awards 1,551 790 Weighted-average shares - Diluted EPS 770,710 768,738 Basic and Diluted EPS Available to PPL common shareowners: Income from continuing operations after income taxes $ 0.26 $ 0.27 Income (loss) from discontinued operations (net of income taxes) (2.65) 0.45 Net Income (Loss) available to PPL common shareowners $ (2.39) $ 0.72 For the periods ended March 31, PPL issued common stock related to stock-based compensation plans and the DRIP as follows (in thousands): Three Months 2021 2020 Stock-based compensation plans 520 598 DRIP — 434 For the periods ended March 31, the following shares (in thousands) were excluded from the computations of diluted EPS because the effect would have been antidilutive. Three Months 2021 2020 Stock-based compensation awards 233 250

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income Taxes	6. Income Taxes Reconciliations of income tax expense (benefit) for the periods ended March 31 are as follows. (PPL) Three Months 2021 2020 Federal income tax on Income from Continuing Operations Before Income Taxes at statutory tax rate - 21% $ 55 $ 56 Increase (decrease) due to: State income taxes, net of federal income tax benefit 12 13 Valuation allowance adjustments 8 6 Depreciation and other items not normalized (2) (2) Amortization of excess deferred federal and state income taxes (12) (11) Other (2) (1) Total increase (decrease) 4 5 Total income tax expense (benefit) $ 59 $ 61 (PPL Electric) Three Months 2021 2020 Federal income tax on Income Before Income Taxes at statutory tax rate - 21% $ 32 $ 33 Increase (decrease) due to: State income taxes, net of federal income tax benefit 12 13 Depreciation and other items not normalized (2) (2) Amortization of excess deferred federal and state income taxes (3) (3) Other (2) — Total increase (decrease) 5 8 Total income tax expense (benefit) $ 37 $ 41 (LKE) Three Months 2021 2020 Federal income tax on Income Before Income Taxes at statutory tax rate - 21% $ 37 $ 35 Increase (decrease) due to: State income taxes, net of federal income tax benefit 7 7 Valuation allowance adjustments (4) — Amortization of excess deferred federal and state income taxes (7) (7) Other (3) (1) Total increase (decrease) (7) (1) Total income tax expense (benefit) $ 30 $ 34 (LG&E) Three Months 2021 2020 Federal income tax on Income Before Income Taxes at statutory tax rate - 21% $ 20 $ 19 Increase (decrease) due to: State income taxes, net of federal income tax benefit 4 4 Amortization of excess deferred federal and state income taxes (3) (3) Other (2) (1) Total increase (decrease) (1) — Total income tax expense (benefit) $ 19 $ 19 (KU) Three Months 2021 2020 Federal income tax on Income Before Income Taxes at statutory tax rate - 21% $ 22 $ 21 Increase (decrease) due to: State income taxes, net of federal income tax benefit 4 4 Amortization of excess deferred federal and state income taxes (4) (4) Other (1) (1) Total increase (decrease) (1) (1) Total income tax expense (benefit) $ 21 $ 20 Other TCJA Regulatory Update (All Registrants)

Utility Rate Regulation

Utility Rate Regulation	3 Months Ended
	Mar. 31, 2021
Regulated Operations [Abstract]
Utility Rate Regulation	7. Utility Rate Regulation (All Registrants) The following table provides information about the regulatory assets and liabilities of cost-based rate-regulated utility operations. PPL PPL Electric March 31, December 31, March 31, December 31, Current Regulatory Assets: Plant outage costs $ 55 $ 46 $ — $ — Gas supply clause 8 4 — — Smart meter rider 21 17 21 17 Transmission formula rate 20 15 20 15 Storm costs 5 7 5 7 Other 12 10 1 1 Total current regulatory assets $ 121 $ 99 $ 47 $ 40 Noncurrent Regulatory Assets: Defined benefit plans $ 556 $ 570 $ 282 $ 290 Storm costs 14 17 — — Unamortized loss on debt 29 30 7 8 Interest rate swaps 18 23 — — Terminated interest rate swaps 74 75 — — Accumulated cost of removal of utility plant 234 240 234 240 AROs 304 300 — — Other 4 7 2 3 Total noncurrent regulatory assets $ 1,233 $ 1,262 $ 525 $ 541 PPL PPL Electric March 31, December 31, March 31, December 31, Current Regulatory Liabilities: Generation supply charge $ 18 $ 21 $ 18 $ 21 Transmission service charge 27 1 27 1 Environmental cost recovery 6 4 — — Universal service rider 16 22 16 22 Fuel adjustment clause 5 5 — — TCJA customer refund 15 11 15 11 Storm damage expense rider 5 6 5 6 Act 129 compliance rider 6 7 6 7 Challenge to transmission formula rate return on equity reserve (a) 27 — 27 — Other 5 2 — — Total current regulatory liabilities $ 130 $ 79 $ 114 $ 68 Noncurrent Regulatory Liabilities: Accumulated cost of removal of utility plant $ 665 $ 653 $ — $ — Power purchase agreement - OVEC 41 43 — — Net deferred taxes 1,673 1,690 552 560 Defined benefit plans 64 60 21 18 Terminated interest rate swaps 65 66 — — Other 18 18 — — Total noncurrent regulatory liabilities $ 2,526 $ 2,530 $ 573 $ 578 LKE LG&E KU March 31, December 31, March 31, December 31, March 31, December 31, Current Regulatory Assets: Plant outage costs $ 55 $ 46 $ 20 $ 12 $ 35 $ 34 Gas supply clause 8 4 8 4 — — Other 11 9 8 7 3 2 Total current regulatory assets $ 74 $ 59 $ 36 $ 23 $ 38 $ 36 Noncurrent Regulatory Assets: Defined benefit plans $ 274 $ 280 $ 170 $ 174 $ 104 $ 106 Storm costs 14 17 9 11 5 6 Unamortized loss on debt 22 22 13 13 9 9 Interest rate swaps 18 23 18 23 — — Terminated interest rate swaps 74 75 43 44 31 31 AROs 304 300 85 85 219 215 Other 2 4 1 1 1 3 Total noncurrent regulatory assets $ 708 $ 721 $ 339 $ 351 $ 369 $ 370 LKE LG&E KU March 31, December 31, March 31, December 31, March 31, December 31, Current Regulatory Liabilities: Environmental cost recovery $ 6 $ 4 $ — $ — $ 6 $ 4 Fuel adjustment clause 5 5 1 — 4 5 Other 5 2 2 — 3 2 Total current regulatory liabilities $ 16 $ 11 $ 3 $ — $ 13 $ 11 Noncurrent Regulatory Liabilities: Accumulated cost of removal $ 665 $ 653 $ 278 $ 274 $ 387 $ 379 Power purchase agreement - OVEC 41 43 28 30 13 13 Net deferred taxes 1,121 1,130 525 528 596 602 Defined benefit plans 43 42 1 — 42 42 Terminated interest rate swaps 65 66 33 33 32 33 Other 18 18 16 17 2 1 Total noncurrent regulatory liabilities $ 1,953 $ 1,952 $ 881 $ 882 $ 1,072 $ 1,070 (a) See “Regulatory Matters - Federal Matters - Challenge to PPL Electric Transmission Formula Rate Return on Equity” below for further information. Regulatory Matters Kentucky Activities ( PPL, LKE, LG&E and KU ) Rate Case Proceedings On November 25, 2020, LG&E and KU filed requests with the KPSC for an increase in annual electricity and gas revenues of approximately $331 million ($131 million and $170 million in electricity revenues at LG&E and KU and $30 million in gas revenues at LG&E). The revenue increases would be an increase of 11.6% and 10.4% in electricity revenues at LG&E and KU, and an increase of 8.3% in gas revenues at LG&E. In recognition of the economic impact of COVID-19, LG&E and KU requested approval of a one-year billing credit which will credit customers approximately $53 million ($41 million at LG&E and $12 million at KU). The billing credit represents the return to customers of certain regulatory liabilities on LG&E’s and KU’s Balance Sheets and serves to partially mitigate the rate increases during the first year in which the new rates are in effect. LG&E’s and KU’s applications also included a request for a CPCN to deploy Advanced Metering Infrastructure across LG&E’s and KU’s service territories in Kentucky. The applications were based on a forecasted test year of July 1, 2021 through June 30, 2022 and requested an authorized return on equity of 10.0%. On April 19, 2021, LG&E and KU entered into an agreement with all intervening parties to the proceedings resolving all matters in their applications, with the explicit exception of LG&E's and KU's net metering proposals. The agreement proposes increases in annual revenues of $217 million ($77 million and $116 million in electricity revenues at LG&E and KU and $24 million in gas revenues at LG&E) based on an authorized return on equity of 9.55%. The proposal includes an authorized 9.35% return on equity for the ECR and GLT mechanisms. The agreement does not modify the requested one-year billing credit. The agreement proposes that the KPSC should grant LG&E’s and KU’s request for a CPCN to deploy Advanced Metering Infrastructure and proposes the establishment of a Retired Asset Recovery rider (RAR) to provide for recovery of and return on the remaining investment in certain electric generating units upon their retirement over a ten-year period following retirement. In respect of the RAR rider, the agreement proposes that LG&E and KU will continue to use currently approved depreciation rates for Mill Creek units 1 and 2 and Brown Unit 3. The agreement also proposes a four-year “stay-out” commitment from LG&E and KU to refrain from effective base rate increases before July 1, 2025, subject to certain exceptions. A hearing on the agreement, and the underlying proceedings, was completed on April 28, 2021. Subject to KPSC approval, the rates, decreased by the amount of the billing credit, are expected to become effective July 1, 2021. An Order on the net metering issues is expected by the end of September 2021. PPL, LKE, LG&E and KU cannot predict the outcome of these proceedings. Pennsylvania Activities ( PPL and PPL Electric ) Act 129 Act 129 requires Pennsylvania Electric Distribution Companies (EDCs) to meet, by specified dates, specified goals for reduction in customer electricity usage and peak demand. EDCs not meeting the requirements of Act 129 are subject to significant penalties. PPL Electric filed with the PUC its Act 129 Phase IV Energy Efficiency and Conservation Plan (Phase IV Act 129 Plan) on November 30, 2020, for the five-year period starting June 1, 2021 and ending on May 31, 2026. PPL Electric's Phase IV Act 129 Plan was approved by the PUC at its March 25, 2021, public meeting. Federal Matters Challenge to PPL Electric Transmission Formula Rate Return on Equity (PPL and PPL Electric) On May 21, 2020, PP&L Industrial Customer Alliance (PPLICA) filed a complaint with the FERC alleging that PPL Electric's base return on equity (ROE) of 11.18% used to determine PPL Electric's formula transmission rate is unjust and unreasonable, and proposing an alternative ROE of 8.0% based on its interpretation of FERC Opinion No. 569. However, also on May 21, 2020, the FERC issued Opinion No. 569-A in response to numerous requests for rehearing of Opinion No. 569, which revised the method for analyzing base ROE. On June 10, 2020, PPLICA filed a Motion to Supplement the May 21, 2020 complaint in which PPLICA continued to allege that PPL Electric’s base ROE is unjust and unreasonable, but revised its analysis of PPL Electric's base ROE to reflect the guidance provided in Opinion No. 569-A. The amended complaint proposed an updated alternative ROE of 8.5% and also requested that the FERC preserve the original refund effective date as established by the filing of the original complaint on May 21, 2020. Several parties have filed motions to intervene, including one party who filed Comments in Support of the original complaint. On July 10, 2020, PPL Electric filed its Answer and supporting Testimony to the PPLICA filings arguing that the FERC should deny the original and amended complaints as they are without merit and fail to demonstrate the existing base ROE is unjust and unreasonable. In addition, PPL Electric contended any refund effective date should be set for no earlier than June 10, 2020 and PPLICA's proposed replacement ROE should be rejected. On October 15, 2020, the FERC issued an order on the PPLICA complaints which established hearing and settlement procedures, set a refund effective date of May 21, 2020 and granted the motions to intervene. On November 16, 2020, PPL Electric filed a request for rehearing of the portion of the October 15, 2020 Order that set the May 21, 2020 refund effective date. On December 17, 2020, the FERC issued a Notice of Denial of Rehearing by Operation of Law and Providing for Further Consideration. On February 16 and April 19, 2021, PPL Electric filed Petitions for Review with the United States Court of Appeals for the District of Columbia Circuit of the portion of the October 15, 2020 Order that set the May 21, 2020 refund effective date. PPL Electric continues to believe its ROE is just and reasonable and that it has meritorious defenses against the original and amended complaints. Settlement negotiations are currently proceeding, but there can be no assurance that they will result in a final settlement. Although PPL Electric cannot predict the outcome of this matter, in the first quarter of 2021, PPL Electric recorded a revenue reserve of $19 million after-tax. Of this amount, $13 million relates to the period from May 21, 2020 to December 31, 2020. Additional revenue earned from May 21, 2020 through the ultimate resolution of this matter may be subject to refund. A change of 50 basis points to the base ROE would impact PPL Electric's net income by approximately $12 million on an annual basis. FERC Transmission Rate Filing (PPL, LKE, LG&E and KU) In 2018, LG&E and KU applied to the FERC requesting elimination of certain on-going credits to a sub-set of transmission customers relating to the 1998 merger of LG&E's and KU's parent entities and the 2006 withdrawal of LG&E and KU from the Midcontinent Independent System Operator, Inc. (MISO), a regional transmission operator and energy market. The application sought termination of LG&E's and KU's commitment to provide certain Kentucky municipalities mitigation for certain horizontal market power concerns arising out of the 1998 LG&E and KU merger and 2006 MISO withdrawal. The amounts at issue are generally waivers or credits granted to a limited number of Kentucky municipalities for either certain LG&E and KU or MISO transmission charges incurred for transmission service received. Due to the development of robust, accessible energy markets over time, LG&E and KU believe the mitigation commitments are no longer relevant or appropriate. In March 2019, the FERC granted LG&E's and KU's request to remove the ongoing credits, conditioned upon the implementation by LG&E and KU of a transition mechanism for certain existing power supply arrangements, subject to FERC review and approval. In July 2019, LG&E and KU proposed their transition mechanism to the FERC and in September 2019, the FERC rejected the proposed transition mechanism. In September 2020, the FERC issued orders in the rehearing process that modified various aspects of the September 2019 orders which had approved future termination of the credits, including adjusting which customer arrangements are covered by the transition mechanism and respective future periods or dates for termination of credits. In November 2020, the FERC denied the parties' rehearing requests. In November 2020 and January 2021, LG&E and KU and other parties appealed the September 2020 and November 2020 orders at the D.C. Circuit Court of Appeals. The appellate proceedings are continuing, and also include certain additional prior pending petitions for review relating to the matter. On January 15, 2021, LG&E and KU made a filing seeking FERC acceptance of a new proposal for a transition mechanism. On March 16, 2021, the FERC accepted the filed transition mechanism agreements effective on March 17, 2021 but subject to refund, and established hearing and settlement procedures. LG&E and KU are also required to make certain compliance filings consistent with the March 16, 2021 order. LG&E and KU cannot predict the outcome of the respective appellate and FERC proceedings. LG&E and KU currently receive recovery of the waivers and credits provided through other rate mechanisms and such rate recovery would be anticipated to be adjusted consistent with potential changes or terminations of the waivers and credits, as such become effective. Other Purchase of Receivables Program (PPL and PPL Electric)

Financing Activities

Financing Activities	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Financing Activities	8. Financing Activities Credit Arrangements and Short-term Debt (All Registrants) The Registrants maintain credit facilities to enhance liquidity, provide credit support and act as a backstop to commercial paper programs. For reporting purposes, on a consolidated basis, the credit facilities and commercial paper programs of PPL Electric, LKE, LG&E and KU also apply to PPL and the credit facilities and commercial paper programs of LG&E and KU also apply to LKE. The amounts listed in the borrowed column below are recorded as "Short-term debt" on the Balance Sheets except for borrowings under PPL Capital Funding’s term loan agreement due March 2022, which are reflected in “Long-term debt due within one year” at March 31, 2021 and “Long-term debt” at December 31, 2020. The following credit facilities were in place at: March 31, 2021 December 31, 2020 Expiration Capacity Borrowed Letters of Unused Borrowed Letters of PPL PPL Capital Funding Syndicated Credit Facility Jan. 2024 $ 1,450 $ — $ 942 $ 508 $ — $ 402 Term Loan Credit Facility Mar. 2022 100 100 — — 100 — Bilateral Credit Facility Mar. 2022 50 — — 50 — — Bilateral Credit Facility Mar. 2022 50 — 15 35 — 15 Term Loan Credit Facility Mar. 2021 — — — — 100 — Term Loan Credit Facility Mar. 2021 — — — — 200 — Total PPL Capital Funding Credit Facilities $ 1,650 $ 100 $ 957 $ 593 $ 400 $ 417 PPL Electric Syndicated Credit Facility Jan. 2024 $ 650 $ — $ 206 $ 444 $ — $ 1 LG&E Syndicated Credit Facility Jan. 2024 $ 500 $ — $ 252 $ 248 $ — $ 262 KU Syndicated Credit Facility Jan. 2024 $ 400 $ — $ 148 $ 252 $ — $ 203 (All Registrants) PPL, PPL Electric, LG&E and KU maintain commercial paper programs to provide an additional financing source to fund short-term liquidity needs. Commercial paper issuances, included in "Short-term debt" on the Balance Sheets, are supported by the respective Registrant's credit facilities. The following commercial paper programs were in place at: March 31, 2021 December 31, 2020 Weighted - Capacity Commercial Unused Weighted - Commercial PPL Capital Funding 0.22% $ 1,500 $ 942 $ 558 0.25% $ 402 PPL Electric 0.20% 650 205 445 — LG&E (a) 0.22% 425 252 173 0.28% 262 KU 0.21% 350 148 202 0.28% 203 Total $ 2,925 $ 1,547 $ 1,378 $ 867 (a) In March 2021, the capacity for the LG&E commercial paper program was increased from $350 million to $425 million. (PPL Electric, LKE, LG&E, and KU) See Note 12 for discussion of intercompany borrowings. Long-term Debt (PPL) In April 2021, PPL Capital Funding repaid the $100 million term loan credit facility expiring in March 2022. (PPL, LKE and LG&E) In April 2021, the Louisville/Jefferson County Metro Government of Kentucky remarketed $128 million of Pollution Control Revenue Bonds, 2003 Series A due 2033 previously issued on behalf of LG&E. The bonds were remarketed at a long-term rate and will bear interest at 2.00% through their maturity date of October 1, 2033. In May 2021, the County of Trimble, Kentucky remarketed $35 million of Pollution Control Revenue Bonds, 2001 Series B due 2027 previously issued on behalf of LG&E. The bonds were remarketed at a long-term rate and will bear interest at 1.35% through their maturity date of November 1, 2027. In May 2021, the Louisville/Jefferson County Metro Government of Kentucky remarketed $35 million of Pollution Control Revenue Bonds, 2001 Series B due 2027 previously issued on behalf of LG&E. The bonds were remarketed at a long-term rate and will bear interest at 1.35% through their maturity date of November 1, 2027. (PPL) Equity Securities ATM Program In February 2018, PPL entered into an equity distribution agreement, pursuant to which PPL may sell, from time to time, up to an aggregate of $1.0 billion of its common stock through an at-the-market offering program, including a forward sales component. The compensation paid to the selling agents by PPL may be up to 2% of the gross offering proceeds of the shares. There were no issuances under the ATM program for the three months ended March 31, 2021. The ATM program expired in February 2021. Distributions In February 2021, PPL declared a quarterly common stock dividend, payable April 1, 2021, of 41.5 cents per share (equivalent to $1.66 per annum). Future dividends, declared at the discretion of the Board of Directors, will depend upon future earnings, cash flows, financial and legal requirements and other factors.

Defined Benefits

Defined Benefits	3 Months Ended
	Mar. 31, 2021
Retirement Benefits [Abstract]
Defined Benefits	10. Defined Benefits (PPL, LKE and LG&E) Certain net periodic defined benefit costs are applied to accounts that are further distributed among capital, expense, regulatory assets and regulatory liabilities, including certain costs allocated to applicable subsidiaries for plans sponsored by PPL Services and LKE. Following are the net periodic defined benefit costs (credits) of the plans sponsored by PPL and its subsidiaries, LKE, and LG&E for the periods ended March 31: Pension Benefits Three Months U.S. U.K. (a) 2021 2020 2021 2020 PPL Service cost $ 13 $ 13 $ 25 $ 23 Interest cost 32 38 29 36 Expected return on plan assets (61) (60) (177) (158) Amortization of: Prior service cost 2 2 — — Actuarial loss 25 20 54 54 Net periodic defined benefit costs (credits) $ 11 $ 13 $ (69) $ (45) (a) U.K. amounts are reflected in discontinued operations. See Note 9 for additional information on the share purchase agreement to sell the U.K. utility business. Pension Benefits Three Months 2021 2020 LKE Service cost $ 6 $ 5 Interest cost 14 16 Expected return on plan assets (24) (24) Amortization of: Prior service cost 2 2 Actuarial loss (a) 11 9 Net periodic defined benefit costs (credits) $ 9 $ 8 (a) As a result of treatment approved by the KPSC, the difference between actuarial loss calculated in accordance with LKE's accounting policy and actuarial loss calculated using a 15-year amortization period was $3 million for the three months ended March 31, 2021 and 2020. . Other Postretirement Benefits Three Months 2021 2020 PPL Service cost $ 2 $ 2 Interest cost 4 5 Expected return on plan assets (5) (5) Net periodic defined benefit costs $ 1 $ 2 LKE Service cost $ 1 $ 1 Interest cost 2 2 Expected return on plan assets (2) (2) Net periodic defined benefit costs $ 1 $ 1 (PPL Electric, LG&E and KU) PPL Electric is allocated costs of defined benefit plans sponsored by PPL Services and LG&E and KU are allocated costs of defined benefit plans sponsored by LKE. LG&E and KU are also allocated costs of defined benefit plans from LKS for defined benefit plans sponsored by LKE. See Note 12 for additional information on costs allocated to LG&E and KU from LKS. These allocations are based on participation in those plans, which management believes are reasonable. For the periods ended March 31, PPL Services allocated the following net periodic defined benefit costs to PPL Electric, and LKE allocated the following net periodic defined benefit costs to LG&E and KU: Three Months 2021 2020 PPL Electric $ — $ 3 LG&E 3 3 KU 1 1 (All Registrants) The non-service cost components of net periodic defined benefit costs (credits) (interest cost, expected return on plan assets, amortization of prior service cost and amortization of actuarial gain and loss) are presented in "Other Income (Expense) - net" on the Statements of Income. See Note 13 for additional information.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	11. Commitments and Contingencies Legal Matters (All Registrants) PPL and its subsidiaries are involved in legal proceedings, claims and litigation in the ordinary course of business. PPL and its subsidiaries cannot predict the outcome of such matters, or whether such matters may result in material liabilities, unless otherwise noted. Talen Litigation (PPL) Background In September 2013, one of PPL's former subsidiaries, PPL Montana entered into an agreement to sell its hydroelectric generating facilities. In June 2014, PPL and PPL Energy Supply, the parent company of PPL Montana, entered into various definitive agreements with affiliates of Riverstone to spin off PPL Energy Supply and ultimately combine it with Riverstone's competitive power generation businesses to form a stand-alone company named Talen Energy. In November 2014, after executing the spinoff agreements but prior to the closing of the spinoff transaction, PPL Montana closed the sale of its hydroelectric generating facilities. Subsequently, on June 1, 2015, the spinoff of PPL Energy Supply was completed. Following the spinoff transaction, PPL had no continuing ownership interest in or control of PPL Energy Supply. In connection with the spinoff transaction, PPL Montana became Talen Montana, LLC (Talen Montana), a subsidiary of Talen Energy. Talen Energy Marketing also became a subsidiary of Talen Energy as a result of the June 2015 spinoff of PPL Energy Supply. Talen Energy has owned and operated both Talen Montana and Talen Energy Marketing since the spinoff. At the time of the spinoff, affiliates of Riverstone acquired a 35% ownership interest in Talen Energy. Riverstone subsequently acquired the remaining interests in Talen Energy in a take private transaction in December 2016. Talen Montana Retirement Plan and Talen Energy Marketing, LLC, Individually and on Behalf of All Others Similarly Situated v. PPL Corporation et al. On October 29, 2018, Talen Montana Retirement Plan and Talen Energy Marketing filed a putative class action complaint on behalf of current and contingent creditors of Talen Montana who allegedly suffered harm or allegedly will suffer reasonably foreseeable harm as a result of a November 2014 distribution of proceeds from the sale of then-PPL Montana's hydroelectric generating facilities. The action was filed in the Sixteenth Judicial District of the State of Montana, Rosebud County, against PPL and certain of its affiliates and current and former officers and directors (Talen Putative Class Action). Plaintiff asserts claims for, among other things, fraudulent transfer, both actual and constructive; recovery against subsequent transferees; civil conspiracy; aiding and abetting tortious conduct; and unjust enrichment. Plaintiff is seeking avoidance of the purportedly fraudulent transfer, unspecified damages, including punitive damages, the imposition of a constructive trust, and other relief. In December 2018, PPL removed the Talen Putative Class Action from the Sixteenth Judicial District of the State of Montana to the United States District Court for the District of Montana, Billings Division (MT Federal Court). In January 2019, the plaintiff moved to remand the Talen Putative Class Action back to state court, and dismissed without prejudice all current and former PPL Corporation directors from the case. In September 2019, the MT Federal Court granted plaintiff's motion to remand the case back to state court. Although, the PPL defendants petitioned the Ninth Circuit Court of Appeals to grant an appeal of the remand decision, in November 2019, the Ninth Circuit Court of Appeals denied that request and in December 2019, Talen Montana Retirement Plan filed a Second Amended Complaint in the Sixteenth Judicial District of the State of Montana, Rosebud County, which removed Talen Energy Marketing as a plaintiff. In January 2020, PPL defendants filed a motion to dismiss the Second Amended Complaint or, in the alternative, to stay the proceedings pending the resolution of the below mentioned Delaware Action. The Court held a hearing on June 24, 2020 regarding the motions. On September 11, 2020, the Court granted PPL defendants' alternative Motion for a Stay of the proceedings. PPL Corporation et al. vs. Riverstone Holdings LLC, Talen Energy Corporation et al. On November 30, 2018, PPL, certain PPL affiliates, and certain current and former officers and directors (PPL plaintiffs) filed a complaint in the Court of Chancery of the State of Delaware seeking various forms of relief against Riverstone, Talen Energy and certain of their affiliates (Delaware Action), in response to and as part of the defense strategy for an action filed by Talen Montana, LLC (the Talen Direct Action, since dismissed) and the Talen Putative Class Action described above (together, the Montana Actions) originally filed in Montana state court in October 2018. In the complaint, the PPL plaintiffs ask the Delaware Court of Chancery for declaratory and injunctive relief. This includes a declaratory judgment that, under the separation agreement governing the spinoff of PPL Energy Supply, all related claims that arise must be heard in Delaware; that the statute of limitations in Delaware and the spinoff agreement bar these claims at this time; that PPL is not liable for the claims in either the Talen Direct Action or the Talen Putative Class Action as PPL Montana was solvent at all relevant times; and that the separation agreement requires that Talen Energy indemnify PPL for all losses arising from the debts of Talen Montana, among other things. PPL's complaint also seeks damages against Riverstone for interfering with the separation agreement and against Riverstone affiliates for breach of the implied covenant of good faith and fair dealing. The complaint was subsequently amended on January 11, 2019 and March 20, 2019, to include, among other things, claims related to indemnification with respect to the Montana Actions, request a declaration that the Montana Actions are time-barred under the spinoff agreements, and allege additional facts to support the tortious interference claim. In April 2019, the defendants filed motions to dismiss the amended complaint. In July 2019, the Court heard oral arguments from the parties regarding the motions to dismiss, and in October 2019, the Delaware Court of Chancery issued an opinion sustaining all of the PPL plaintiffs' claims except for the claim for breach of implied covenant of good faith and fair dealing. As a result of the dismissal of the Talen Direct Action in December 2019, in January 2020, Talen Energy filed a new motion to dismiss five of the remaining eight claims in the amended complaint. The Court heard oral argument on the motion to dismiss on May 28, 2020, and on June 22, 2020, issued an opinion denying the motion in its entirety. Discovery is proceeding, and a trial has been scheduled for February 2022. With respect to each of the Talen-related matters described above, PPL believes that the 2014 distribution of proceeds was made in compliance with all applicable laws and that PPL Montana was solvent at all relevant times. Additionally, the agreements entered into in connection with the spinoff, which PPL and affiliates of Talen Energy and Riverstone negotiated and executed prior to the 2014 distribution, directly address the treatment of the proceeds from the sale of PPL Montana's hydroelectric generating facilities; in those agreements, Talen Energy and Riverstone definitively agreed that PPL was entitled to retain the proceeds. PPL believes that it has meritorious defenses to the claims made in the Talen Putative Class Action and intends to continue to vigorously defend against this action. The Talen Putative Class Action and the Delaware Action are both in early stages of litigation; at this time, PPL cannot predict the outcome of these matters or estimate the range of possible losses, if any, that PPL might incur as a result of the claims, although they could be material. (PPL, LKE and LG&E) Cane Run Environmental Claims In December 2013, six residents, on behalf of themselves and others similarly situated, filed a class action complaint against LG&E and PPL in the U.S. District Court for the Western District of Kentucky (U.S. District Court) alleging violations of the Clean Air Act, RCRA, and common law claims of nuisance, trespass and negligence. In July 2014, the U.S. District Court dismissed the RCRA claims and all but one Clean Air Act claim, but declined to dismiss the common law tort claims. In February 2017, the U.S. District Court dismissed PPL as a defendant and dismissed the final federal claim against LG&E, and in April 2017, issued an Order declining to exercise supplemental jurisdiction on the state law claims dismissing the case in its entirety. In June 2017, the plaintiffs filed a class action complaint in Jefferson County, Kentucky Circuit Court, against LG&E alleging state law nuisance, negligence and trespass tort claims. The plaintiffs seek compensatory and punitive damages for alleged property damage due to purported plant emissions on behalf of a class of residents within one to three miles of the plant. On January 8, 2020, the Jefferson Circuit Court issued an order denying the plaintiffs’ request for class certification. On January 14, 2020, the plaintiffs filed a notice of appeal in the Kentucky Court of Appeals. On December 11, 2020, the Court of Appeals issued an order affirming the lower court’s denial of class certification. In December 2020, plaintiffs filed a petition for discretionary review with the Kentucky Supreme Court. On April 21, 2021, the Kentucky Supreme Court denied further review of the lower court order. The case will be remanded to the Jefferson Circuit Court for the claims of the three remaining petitioners to be heard on an individual basis. PPL, LKE and LG&E cannot predict the ultimate outcome of the remaining proceedings, but do not anticipate this matter will have a material impact on operations or financial condition. ( PPL, LKE and KU) E.W. Brown Environmental Claims In July 2017, the Kentucky Waterways Alliance and the Sierra Club filed a citizen suit complaint against KU in the U.S. District Court for the Eastern District of Kentucky (U.S. District Court) alleging discharges at the E.W. Brown plant in violation of the Clean Water Act and the plant's water discharge permit and alleging contamination that may present an imminent and substantial endangerment in violation of the RCRA. The plaintiffs' suit relates to prior notices of intent to file a citizen suit submitted in October and November 2015 and October 2016. These plaintiffs sought injunctive relief ordering KU to take all actions necessary to comply with the Clean Water Act and RCRA, including ceasing the discharges in question, abating effects associated with prior discharges and eliminating the alleged imminent and substantial endangerment. These plaintiffs also sought assessment of civil penalties and an award of litigation costs and attorney fees. In December 2017, the U.S. District Court issued an Order dismissing the Clean Water Act and RCRA complaints against KU in their entirety. In January 2018, the plaintiffs appealed the dismissal Order to the U.S. Court of Appeals for the Sixth Circuit. In September 2018, the U.S. Court of Appeals for the Sixth Circuit issued its ruling affirming the lower court's decision to dismiss the Clean Water Act claims but reversing its dismissal of the RCRA claims against KU and remanding the latter to the U.S. District Court. In October 2018, KU filed a petition for rehearing to the U.S. Court of Appeals for the Sixth Circuit regarding the RCRA claims. In November 2018, the U.S. Court of Appeals for the Sixth Circuit denied KU's petition for rehearing regarding the RCRA claims. In January 2019, KU filed an answer to plaintiffs’ complaint in the U.S. District Court. Discovery is complete and the parties' motions for partial summary judgment are pending. In December 2020, the U.S. District Court delayed the trial scheduled for February 2, 2021 indefinitely due to pandemic considerations. PPL, LKE and KU cannot predict the outcome of these matters and an estimate or range of possible losses cannot be determined. KU is undertaking extensive remedial measures at the E.W. Brown plant including closure of the former ash pond, implementation of a groundwater remedial action plan and performance of a corrective action plan including aquatic study of adjacent surface waters and risk assessment. The aquatic study and risk assessment are being undertaken pursuant to a 2017 agreed Order with the Kentucky Energy and Environment Cabinet (KEEC). KU conducted sampling of Herrington Lake in 2017 and 2018. In June 2019, KU submitted to the KEEC the required aquatic study and risk assessment, conducted by an independent third-party consultant, finding that discharges from the E.W. Brown plant have not had any significant impact on Herrington Lake and that the water in the lake is safe for recreational use and meets safe drinking water standards. However, until the KEEC assesses the study and issues any regulatory determinations, PPL, LKE and KU are unable to determine whether additional remedial measures will be required at the E.W. Brown plant. Air Sulfuric Acid Mist Emissions (PPL, LKE and LG&E) In June 2016, the EPA issued a notice of violation under the Clean Air Act alleging that LG&E violated applicable rules relating to sulfuric acid mist emissions at its Mill Creek plant. The notice alleges failure to install proper controls, failure to operate the facility consistent with good air pollution control practice, and causing emissions exceeding applicable requirements or constituting a nuisance or endangerment. LG&E believes it has complied with applicable regulations during the relevant time period. On July 31, 2020, the U.S. Department of Justice and Louisville Metro Air Pollution Control District filed a complaint in the U.S. District Court for the Western District of Kentucky alleging violations specified in the EPA notice of violation and seeking civil penalties and injunctive relief. In October 2020, LG&E filed a motion to dismiss the complaint. In December 2020, the U.S. Department of Justice and the Louisville Metro Air Pollution Control District filed an amended complaint. In February 2021, LG&E filed a renewed motion to dismiss regarding the amended complaint. PPL, LKE and LG&E are unable to predict the outcome of this matter or the potential impact on operations of the Mill Creek plant, including increased capital or operating costs, and potential civil penalties or remedial measures, if any. An estimate or range of possible losses cannot be determined. Water/Waste (PPL, LKE, LG&E and KU) ELGs In 2015, the EPA finalized ELGs for wastewater discharge permits for new and existing steam electricity generating facilities. These guidelines require deployment of additional control technologies providing physical, chemical and biological treatment and mandate operational changes including "no discharge" requirements for certain wastewaters. The implementation date for individual generating stations was to be determined by the states on a case-by-case basis according to criteria provided by the EPA. Legal challenges to the final rule were consolidated before the U.S. Court of Appeals for the Fifth Circuit. In April 2017, the EPA announced that it would grant petitions for reconsideration of the rule. In September 2017, the EPA issued a rule to postpone the compliance date for certain requirements. On October 13, 2020, the EPA published final revisions to its best available technology standards for certain wastewaters and potential extensions to compliance dates. The rule is expected to be implemented by the states or applicable permitting authorities in the course of their normal permitting activities. LG&E and KU are currently implementing responsive compliance strategies and schedules. Certain aspects of these compliance plans and estimates relate to developments in state water quality standards, which are separate from the ELG rule or its implementation. Certain costs are included in the Registrants' capital plans and expected to be recovered from customers through rate recovery mechanisms, but additional costs and recovery will depend on further regulatory developments at the state level. CCRs In 2015, the EPA issued a final rule governing management of CCRs which include fly ash, bottom ash and sulfur dioxide scrubber wastes. The CCR Rule imposes extensive new requirements for certain CCR impoundments and landfills, including public notifications, location restrictions, design and operating standards, groundwater monitoring and corrective action requirements, and closure and post-closure care requirements, and specifies restrictions relating to the beneficial use of CCRs. In July 2018, the EPA issued a final rule extending the deadline for closure of certain impoundments and adopting other substantive changes. In August 2018, the D.C. Circuit Court of Appeals vacated and remanded portions of the CCR Rule. In December 2019, the EPA addressed the deficiencies identified by the court and proposed amendments to change the closure deadline. In August 2020, the EPA published a final rule extending the deadline to initiate closure to April 11, 2021, while providing for certain extensions. The EPA is conducting ongoing rulemaking actions regarding various other amendments to the rule. Certain ongoing legal challenges to various provisions of the CCR Rule have been held in abeyance pending review by the EPA pursuant to the President's executive order. PPL, LKE, LG&E and KU are unable to predict the outcome of the ongoing litigation and rulemaking or potential impacts on current LG&E and KU compliance plans. The Registrants are currently finalizing closure plans and schedules. In January 2017, Kentucky issued a new state rule relating to CCR management, effective May 2017, aimed at reflecting the requirements of the federal CCR rule. As a result of a subsequent legal challenge, in January 2018, the Franklin County, Kentucky Circuit Court issued an opinion invalidating certain procedural elements of the rule. LG&E and KU presently operate their facilities under continuing permits authorized under the former program and do not currently anticipate material impacts as a result of the judicial ruling. The Kentucky Energy and Environmental Cabinet has announced it intends to propose new state rules aimed at addressing procedural deficiencies identified by the court and providing the regulatory framework necessary for operation of the state program in lieu of the federal CCR Rule. Associated costs are expected to be subject to rate recovery. LG&E and KU received KPSC approval for a compliance plan providing for the closure of impoundments at the Mill Creek, Trimble County, E.W. Brown, and Ghent stations, and construction of process water management facilities at those plants. In addition to the foregoing measures required for compliance with the federal CCR rule, KU also received KPSC approval for its plans to close impoundments at the retired Green River, Pineville and Tyrone plants to comply with applicable state law. As of April 2021, LG&E and KU have commenced closure of all of the subject impoundments and have completed closure of some of their smaller impoundments. LG&E and KU generally expect to complete impoundment closures within five years of commencement, although a longer period may be required to complete closure of some facilities. Associated costs are expected to be subject to rate recovery. In connection with the final CCR rule, LG&E and KU recorded adjustments to existing AROs beginning in 2015 and continue to record adjustments as required. See Note 16 for additional information. Further changes to AROs, current capital plans or operating costs may be required as estimates are refined based on closure developments, groundwater monitoring results, and regulatory or legal proceedings. Costs relating to this rule are subject to rate recovery. (All Registrants) Superfund and Other Remediation PPL Electric, LG&E and KU are potentially responsible for investigating and remediating contamination under the federal Superfund program and similar state programs. Actions are under way at certain sites including former coal gas manufacturing plants in Pennsylvania and Kentucky previously owned or operated by, or currently owned by predecessors or affiliates of, PPL Electric, LG&E and KU. PPL Electric is potentially responsible for a share of clean-up costs at certain sites including the Columbia Gas Plant site and the Brodhead site. Cleanup actions have been or are being undertaken at these sites as requested by governmental agencies, the costs of which have not been and are not expected to be significant to PPL Electric. As of March 31, 2021 and December 31, 2020, PPL Electric had a recorded liability of $10 million representing its best estimate of the probable loss incurred to remediate the sites identified above. Depending on the outcome of investigations at identified sites where investigations have not begun or been completed, or developments at sites for which information is incomplete, additional costs of remediation could be incurred. PPL Electric, LG&E and KU lack sufficient information about such additional sites to estimate any potential liability or range of reasonably possible losses, if any, related to these sites. Such costs, however, are not currently expected to be significant. The EPA is evaluating the risks associated with polycyclic aromatic hydrocarbons and naphthalene, chemical by-products of coal gas manufacturing. As a result, individual states may establish stricter standards for water quality and soil cleanup, that could require several PPL subsidiaries to take more extensive assessment and remedial actions at former coal gas manufacturing plants. PPL, PPL Electric, LKE, LG&E and KU cannot estimate a range of possible losses, if any, related to these matters. Regulatory Issues ( All Registrants) See Note 7 for information on regulatory matters related to utility rate regulation. Electricity - Reliability Standards The NERC is responsible for establishing and enforcing mandatory reliability standards (Reliability Standards) regarding the bulk electric system in North America. The FERC oversees this process and independently enforces the Reliability Standards. The Reliability Standards have the force and effect of law and apply to certain users of the bulk electric system, including electric utility companies, generators and marketers. Under the Federal Power Act, the FERC may assess civil penalties for certain violations. PPL Electric, LG&E and KU monitor their compliance with the Reliability Standards and self-report or self-log potential violations of applicable reliability requirements whenever identified, and submit accompanying mitigation plans, as required. The resolution of a small number of potential violations is pending. Penalties incurred to date have not been significant. Any Regional Reliability Entity determination concerning the resolution of violations of the Reliability Standards remains subject to the approval of the NERC and the FERC. In the course of implementing their programs to ensure compliance with the Reliability Standards by those PPL affiliates subject to the standards, certain other instances of potential non-compliance may be identified from time to time. The Registrants cannot predict the outcome of these matters, and an estimate or range of possible losses cannot be determined. Other Guarantees and Other Assurances (All Registrants) In the normal course of business, the Registrants enter into agreements that provide financial performance assurance to third parties on behalf of certain subsidiaries. Such agreements include, for example, guarantees, stand-by letters of credit issued by financial institutions and surety bonds issued by insurance companies. These agreements are entered into primarily to support or enhance the creditworthiness attributed to a subsidiary on a stand-alone basis or to facilitate the commercial activities in which these subsidiaries engage. (PPL) PPL fully and unconditionally guarantees all of the debt securities of PPL Capital Funding. (All Registrants) The table below details guarantees provided as of March 31, 2021. "Exposure" represents the estimated maximum potential amount of future payments that could be required to be made under the guarantee. The probability of expected payment/performance under each of these guarantees is remote except for "WPD guarantee of pension and other obligations of unconsolidated entities," for which PPL has a total recorded liability of $4 million at March 31, 2021 and $5 million at December 31, 2020 , which is included in “Current liabilities held for sale” on the Balance Sheets. For reporting purposes, on a consolidated basis, all guarantees of PPL Electric, LKE, LG&E and KU also apply to PPL, and all guarantees of LG&E and KU also apply to LKE. Exposure at March 31, 2021 Expiration PPL WPD indemnifications for entities in liquidation and sales of assets $ 11 (a) 2023 WPD guarantee of pension and other obligations of unconsolidated entities 96 (b) LKE Indemnification of lease termination and other divestitures $ 200 (c) 2021 LG&E and KU LG&E and KU obligation of shortfall related to OVEC (d) (a) Indemnification to the liquidators and certain others for existing liabilities or expenses or liabilities arising during the liquidation process. The indemnifications are limited to distributions made from the subsidiary to its parent either prior or subsequent to liquidation or are not explicitly stated in the agreements. The indemnifications generally expire two to seven years subsequent to the date of dissolution of the entities. The exposure noted only includes those cases where the agreements provide for specific limits. In connection with their sales of various businesses, WPD and its affiliates have provided the purchasers with indemnifications that are standard for such transactions, including indemnifications for certain pre-existing liabilities and environmental and tax matters or have agreed to continue their obligations under existing third-party guarantees, either for a set period of time following the transactions or upon the condition that the purchasers make reasonable efforts to terminate the guarantees. Additionally, WPD and its affiliates remain secondarily responsible for lease payments under certain leases that they have assigned to third parties. (b) Relates to certain obligations of discontinued or modified electric associations that were guaranteed at the time of privatization by the participating members. Costs are allocated to the members and can be reallocated if an existing member becomes insolvent. At March 31, 2021, WPD has recorded an estimated discounted liability for which the expected payment/performance is probable. Neither the expiration date nor the maximum amount of potential payments for certain obligations is explicitly stated in the related agreements, and as a result, the exposure has been estimated. (c) LKE provides certain indemnifications covering the due and punctual payment, performance and discharge by each party of its respective obligations. The most comprehensive of these guarantees is the LKE guarantee covering operational, regulatory and environmental commitments and indemnifications made by WKE under a 2009 Transaction Termination Agreement. This guarantee has a term of 12 years ending July 2021, and a maximum exposure of $200 million exclusive of certain items such as government fines and penalties that may exceed the maximum. Additionally, LKE has indemnified various third parties related to historical obligations for other divested subsidiaries and affiliates. The indemnifications vary by entity and the maximum exposures range from being capped at the sale price to no specified maximum. LKE could be required to perform on these indemnifications in the event of covered losses or liabilities being claimed by an indemnified party. LKE cannot predict the ultimate outcomes of the various indemnification scenarios, but does not expect such outcomes to result in significant losses above the amounts recorded. (d) Pursuant to the OVEC power purchase contract, LG&E and KU are obligated to pay for their share of OVEC's excess debt service, post-retirement and decommissioning costs, as well as any shortfall from amounts included within a demand charge designed and expected to cover these costs over the term of the contract. LKE's proportionate share of OVEC's outstanding debt was $103 million at March 31, 2021, consisting of LG&E's share of $71 million and KU's share of $32 million. The maximum exposure and the expiration date of these potential obligations are not presently determinable. See "Energy Purchase Commitments" in Note 11 in PPL's, LKE's, LG&E's and KU's 2020 Form 10-K for additional information on the OVEC power purchase contract. In March 2018, a sponsor with a 4.85% pro-rata share of OVEC obligations filed for bankruptcy under Chapter 11 and, in August 2018, received a rejection order for the OVEC power purchase contract in the bankruptcy proceeding. OVEC and other entities challenged the contract rejection, the bankruptcy plan confirmation and regulatory aspects of the plan in various forums. In May 2020, OVEC and the relevant sponsor announced a settlement resolving all disputed matters in the bankruptcy and other proceedings, including providing that the sponsor will withdraw its request to reject the power purchase agreement. The settlement was implemented in July 2020. The Registrants provide other miscellaneous guarantees through contracts entered into in the normal course of business. These guarantees are primarily in the form of indemnification or warranties related to services or equipment and vary in duration. The amounts of these guarantees often are not explicitly stated, and the overall maximum amount of the obligation under such guarantees cannot be reasonably estimated. Historically, no significant payments have been made with respect to these types of guarantees and the probability of payment/performance under these guarantees is remote. PPL, on behalf of itself and certain of its subsidiaries, maintains insurance that covers liability assumed under contract for bodily injury and property damage. The coverage provides maximum aggregate coverage of $225 million. This insurance may be applicable to obligations under certain of these contractual arrangements. Risks and Uncertainties (All Registrants) The COVID-19 pandemic has disrupted the U.S. and global economies and continues to present extraordinary challenges to businesses, communities, workforces and markets. In the U.S. and throughout the world, governmental authorities have taken urgent and extensive actions to contain the spread of the virus and mitigate known or foreseeable impacts. In the Registrants’ service territories, mitigation measures have included quarantines, stay-at-home orders, travel restrictions, reduced operations or closures of businesses, schools and governmental agencies, and legislative or regulatory actions to address health or other pandemic-related concerns, all of which have the potential to adversely impact the Registrants' business and operations, especially if these measures remain in effect for a prolonged period of time.

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2021
PPL Electric Utilities Corp [Member]
Related Party Transactions [Line Items]
Related Party Transactions	12. Related Party Transactions Support Costs (PPL Electric, LKE, LG&E and KU) PPL Services, PPL EU Services and LKS provide PPL, PPL Electric and LKE, their respective subsidiaries, including LG&E and KU, and each other with administrative, management and support services. For all services companies, the costs of directly assignable and attributable services are charged to the respective recipients as direct support costs. General costs that cannot be directly attributed to a specific entity are allocated and charged to the respective recipients as indirect support costs. PPL Services and PPL EU Services use a three-factor methodology that includes the applicable recipients' invested capital, operation and maintenance expenses and number of employees to allocate indirect costs. PPL Services may also use a ratio of overall direct and indirect costs or a weighted average cost ratio. LKS bases its indirect allocations on the subsidiaries' number of employees, total assets, revenues, number of customers and/or other statistical information. PPL Services, PPL EU Services and LKS charged the following amounts for the periods ended March 31, including amounts applied to accounts that are further distributed between capital and expense on the books of the recipients, based on methods that are believed to be reasonable. Three Months 2021 2020 PPL Electric from PPL Services $ 10 $ 10 LKE from PPL Services 6 6 PPL Electric from PPL EU Services 50 41 LG&E from LKS 42 38 KU from LKS 44 41 In addition to the charges for services noted above, LKS makes payments on behalf of LG&E and KU for fuel purchases and other costs for products or services provided by third parties. LG&E and KU also provide services to each other and to LKS. Billings between LG&E and KU relate to labor and overheads associated with union and hourly employees performing work for the other company, charges related to jointly-owned generating units and other miscellaneous charges. Tax settlements between LKE and LG&E and KU are reimbursed through LKS. Intercompany Borrowings (PPL Electric) PPL Energy Funding maintains a $650 million revolving line of credit with a PPL Electric subsidiary. No balance was outstanding at March 31, 2021 and December 31, 2020. The interest rates on borrowings are equal to one-month LIBOR plus a spread. Interest income is reflected in "Interest Income from Affiliate" on the Income Statements. (LKE) LKE maintains a $375 million revolving line of credit with a PPL Energy Funding subsidiary whereby LKE can borrow funds on a short-term basis at market-based rates. The interest rates on borrowings are equal to one-month LIBOR plus a spread. At March 31, 2021 and December 31, 2020, $227 million and $251 million were outstanding and reflected in "Notes payable with affiliates" on the Balance Sheets. The interest rates on the outstanding borrowings at March 31, 2021 and December 31, 2020 were 1.62% and 1.65%. Interest expense on the revolving line of credit was not significant for the three months ended March 31, 2021 and 2020. LKE maintains an agreement with a PPL affiliate that has a $300 million borrowing limit whereby LKE can loan funds on a short-term basis at market-based rates. No balance was outstanding at March 31, 2021 and December 31, 2020. The interest rate on the loan is based on the PPL affiliate's credit rating and equal to one-month LIBOR plus a spread. LKE maintains ten (LG&E and KU) LG&E participates in an intercompany money pool agreement whereby LKE and/or KU make available to LG&E funds up to the difference between LG&E's FERC borrowing limit and LG&E's commercial paper capacity limit at an interest rate based on the lower of a market index of commercial paper issues and two additional rate options based on LIBOR. LG&E's money pool borrowing limit is $325 million. No balances were outstanding at March 31, 2021 and December 31, 2020. KU participates in an intercompany money pool agreement whereby LKE and/or LG&E make available to KU funds up to the difference between KU's FERC borrowing limit and KU's commercial paper capacity limit at an interest rate based on the lower of a market index of commercial paper issues and two additional rate options based on LIBOR. KU's money pool borrowing limit is $300 million. No balances were outstanding at March 31, 2021 and December 31, 2020. VEBA Funds Receivable (PPL Electric) In May 2018, PPL received a favorable private letter ruling from the IRS permitting a transfer of excess funds from the PPL Bargaining Unit Retiree Health Plan VEBA to a new subaccount within the VEBA, to be used to pay medical claims of active bargaining unit employees. Based on PPL Electric's participation in PPL’s Other Postretirement Benefit plan, PPL Electric was allocated a portion of the excess funds from PPL Services. These funds have been recorded as an intercompany receivable on PPL Electric's Balance Sheets. The receivable balance decreases as PPL Electric pays incurred medical claims and is reimbursed by PPL Services. The intercompany receivable balance associated with these funds was $20 million as of March 31, 2021, of which $10 million was reflected in "Accounts receivable from affiliates" and $10 million was reflected in "Other noncurrent assets" on the PPL Electric Balance Sheet. The intercompany receivable balance associated with these funds was $22 million as of December 31, 2020, of which $10 million was reflected in "Accounts receivable from affiliates" and $12 million was reflected in "Other noncurrent assets" on the PPL Electric Balance Sheet. Other (PPL Electric, LG&E and KU)
LG And E And KU Energy LLC [Member]
Related Party Transactions [Line Items]
Related Party Transactions	12. Related Party Transactions Support Costs (PPL Electric, LKE, LG&E and KU) PPL Services, PPL EU Services and LKS provide PPL, PPL Electric and LKE, their respective subsidiaries, including LG&E and KU, and each other with administrative, management and support services. For all services companies, the costs of directly assignable and attributable services are charged to the respective recipients as direct support costs. General costs that cannot be directly attributed to a specific entity are allocated and charged to the respective recipients as indirect support costs. PPL Services and PPL EU Services use a three-factor methodology that includes the applicable recipients' invested capital, operation and maintenance expenses and number of employees to allocate indirect costs. PPL Services may also use a ratio of overall direct and indirect costs or a weighted average cost ratio. LKS bases its indirect allocations on the subsidiaries' number of employees, total assets, revenues, number of customers and/or other statistical information. PPL Services, PPL EU Services and LKS charged the following amounts for the periods ended March 31, including amounts applied to accounts that are further distributed between capital and expense on the books of the recipients, based on methods that are believed to be reasonable. Three Months 2021 2020 PPL Electric from PPL Services $ 10 $ 10 LKE from PPL Services 6 6 PPL Electric from PPL EU Services 50 41 LG&E from LKS 42 38 KU from LKS 44 41 In addition to the charges for services noted above, LKS makes payments on behalf of LG&E and KU for fuel purchases and other costs for products or services provided by third parties. LG&E and KU also provide services to each other and to LKS. Billings between LG&E and KU relate to labor and overheads associated with union and hourly employees performing work for the other company, charges related to jointly-owned generating units and other miscellaneous charges. Tax settlements between LKE and LG&E and KU are reimbursed through LKS. Intercompany Borrowings (PPL Electric) PPL Energy Funding maintains a $650 million revolving line of credit with a PPL Electric subsidiary. No balance was outstanding at March 31, 2021 and December 31, 2020. The interest rates on borrowings are equal to one-month LIBOR plus a spread. Interest income is reflected in "Interest Income from Affiliate" on the Income Statements. (LKE) LKE maintains a $375 million revolving line of credit with a PPL Energy Funding subsidiary whereby LKE can borrow funds on a short-term basis at market-based rates. The interest rates on borrowings are equal to one-month LIBOR plus a spread. At March 31, 2021 and December 31, 2020, $227 million and $251 million were outstanding and reflected in "Notes payable with affiliates" on the Balance Sheets. The interest rates on the outstanding borrowings at March 31, 2021 and December 31, 2020 were 1.62% and 1.65%. Interest expense on the revolving line of credit was not significant for the three months ended March 31, 2021 and 2020. LKE maintains an agreement with a PPL affiliate that has a $300 million borrowing limit whereby LKE can loan funds on a short-term basis at market-based rates. No balance was outstanding at March 31, 2021 and December 31, 2020. The interest rate on the loan is based on the PPL affiliate's credit rating and equal to one-month LIBOR plus a spread. LKE maintains ten (LG&E and KU) LG&E participates in an intercompany money pool agreement whereby LKE and/or KU make available to LG&E funds up to the difference between LG&E's FERC borrowing limit and LG&E's commercial paper capacity limit at an interest rate based on the lower of a market index of commercial paper issues and two additional rate options based on LIBOR. LG&E's money pool borrowing limit is $325 million. No balances were outstanding at March 31, 2021 and December 31, 2020. KU participates in an intercompany money pool agreement whereby LKE and/or LG&E make available to KU funds up to the difference between KU's FERC borrowing limit and KU's commercial paper capacity limit at an interest rate based on the lower of a market index of commercial paper issues and two additional rate options based on LIBOR. KU's money pool borrowing limit is $300 million. No balances were outstanding at March 31, 2021 and December 31, 2020. VEBA Funds Receivable (PPL Electric) In May 2018, PPL received a favorable private letter ruling from the IRS permitting a transfer of excess funds from the PPL Bargaining Unit Retiree Health Plan VEBA to a new subaccount within the VEBA, to be used to pay medical claims of active bargaining unit employees. Based on PPL Electric's participation in PPL’s Other Postretirement Benefit plan, PPL Electric was allocated a portion of the excess funds from PPL Services. These funds have been recorded as an intercompany receivable on PPL Electric's Balance Sheets. The receivable balance decreases as PPL Electric pays incurred medical claims and is reimbursed by PPL Services. The intercompany receivable balance associated with these funds was $20 million as of March 31, 2021, of which $10 million was reflected in "Accounts receivable from affiliates" and $10 million was reflected in "Other noncurrent assets" on the PPL Electric Balance Sheet. The intercompany receivable balance associated with these funds was $22 million as of December 31, 2020, of which $10 million was reflected in "Accounts receivable from affiliates" and $12 million was reflected in "Other noncurrent assets" on the PPL Electric Balance Sheet. Other (PPL Electric, LG&E and KU)
Louisville Gas And Electric Co [Member]
Related Party Transactions [Line Items]
Related Party Transactions	12. Related Party Transactions Support Costs (PPL Electric, LKE, LG&E and KU) PPL Services, PPL EU Services and LKS provide PPL, PPL Electric and LKE, their respective subsidiaries, including LG&E and KU, and each other with administrative, management and support services. For all services companies, the costs of directly assignable and attributable services are charged to the respective recipients as direct support costs. General costs that cannot be directly attributed to a specific entity are allocated and charged to the respective recipients as indirect support costs. PPL Services and PPL EU Services use a three-factor methodology that includes the applicable recipients' invested capital, operation and maintenance expenses and number of employees to allocate indirect costs. PPL Services may also use a ratio of overall direct and indirect costs or a weighted average cost ratio. LKS bases its indirect allocations on the subsidiaries' number of employees, total assets, revenues, number of customers and/or other statistical information. PPL Services, PPL EU Services and LKS charged the following amounts for the periods ended March 31, including amounts applied to accounts that are further distributed between capital and expense on the books of the recipients, based on methods that are believed to be reasonable. Three Months 2021 2020 PPL Electric from PPL Services $ 10 $ 10 LKE from PPL Services 6 6 PPL Electric from PPL EU Services 50 41 LG&E from LKS 42 38 KU from LKS 44 41 In addition to the charges for services noted above, LKS makes payments on behalf of LG&E and KU for fuel purchases and other costs for products or services provided by third parties. LG&E and KU also provide services to each other and to LKS. Billings between LG&E and KU relate to labor and overheads associated with union and hourly employees performing work for the other company, charges related to jointly-owned generating units and other miscellaneous charges. Tax settlements between LKE and LG&E and KU are reimbursed through LKS. Intercompany Borrowings (PPL Electric) PPL Energy Funding maintains a $650 million revolving line of credit with a PPL Electric subsidiary. No balance was outstanding at March 31, 2021 and December 31, 2020. The interest rates on borrowings are equal to one-month LIBOR plus a spread. Interest income is reflected in "Interest Income from Affiliate" on the Income Statements. (LKE) LKE maintains a $375 million revolving line of credit with a PPL Energy Funding subsidiary whereby LKE can borrow funds on a short-term basis at market-based rates. The interest rates on borrowings are equal to one-month LIBOR plus a spread. At March 31, 2021 and December 31, 2020, $227 million and $251 million were outstanding and reflected in "Notes payable with affiliates" on the Balance Sheets. The interest rates on the outstanding borrowings at March 31, 2021 and December 31, 2020 were 1.62% and 1.65%. Interest expense on the revolving line of credit was not significant for the three months ended March 31, 2021 and 2020. LKE maintains an agreement with a PPL affiliate that has a $300 million borrowing limit whereby LKE can loan funds on a short-term basis at market-based rates. No balance was outstanding at March 31, 2021 and December 31, 2020. The interest rate on the loan is based on the PPL affiliate's credit rating and equal to one-month LIBOR plus a spread. LKE maintains ten (LG&E and KU) LG&E participates in an intercompany money pool agreement whereby LKE and/or KU make available to LG&E funds up to the difference between LG&E's FERC borrowing limit and LG&E's commercial paper capacity limit at an interest rate based on the lower of a market index of commercial paper issues and two additional rate options based on LIBOR. LG&E's money pool borrowing limit is $325 million. No balances were outstanding at March 31, 2021 and December 31, 2020. KU participates in an intercompany money pool agreement whereby LKE and/or LG&E make available to KU funds up to the difference between KU's FERC borrowing limit and KU's commercial paper capacity limit at an interest rate based on the lower of a market index of commercial paper issues and two additional rate options based on LIBOR. KU's money pool borrowing limit is $300 million. No balances were outstanding at March 31, 2021 and December 31, 2020. VEBA Funds Receivable (PPL Electric) In May 2018, PPL received a favorable private letter ruling from the IRS permitting a transfer of excess funds from the PPL Bargaining Unit Retiree Health Plan VEBA to a new subaccount within the VEBA, to be used to pay medical claims of active bargaining unit employees. Based on PPL Electric's participation in PPL’s Other Postretirement Benefit plan, PPL Electric was allocated a portion of the excess funds from PPL Services. These funds have been recorded as an intercompany receivable on PPL Electric's Balance Sheets. The receivable balance decreases as PPL Electric pays incurred medical claims and is reimbursed by PPL Services. The intercompany receivable balance associated with these funds was $20 million as of March 31, 2021, of which $10 million was reflected in "Accounts receivable from affiliates" and $10 million was reflected in "Other noncurrent assets" on the PPL Electric Balance Sheet. The intercompany receivable balance associated with these funds was $22 million as of December 31, 2020, of which $10 million was reflected in "Accounts receivable from affiliates" and $12 million was reflected in "Other noncurrent assets" on the PPL Electric Balance Sheet. Other (PPL Electric, LG&E and KU)
Kentucky Utilities Co [Member]
Related Party Transactions [Line Items]
Related Party Transactions	12. Related Party Transactions Support Costs (PPL Electric, LKE, LG&E and KU) PPL Services, PPL EU Services and LKS provide PPL, PPL Electric and LKE, their respective subsidiaries, including LG&E and KU, and each other with administrative, management and support services. For all services companies, the costs of directly assignable and attributable services are charged to the respective recipients as direct support costs. General costs that cannot be directly attributed to a specific entity are allocated and charged to the respective recipients as indirect support costs. PPL Services and PPL EU Services use a three-factor methodology that includes the applicable recipients' invested capital, operation and maintenance expenses and number of employees to allocate indirect costs. PPL Services may also use a ratio of overall direct and indirect costs or a weighted average cost ratio. LKS bases its indirect allocations on the subsidiaries' number of employees, total assets, revenues, number of customers and/or other statistical information. PPL Services, PPL EU Services and LKS charged the following amounts for the periods ended March 31, including amounts applied to accounts that are further distributed between capital and expense on the books of the recipients, based on methods that are believed to be reasonable. Three Months 2021 2020 PPL Electric from PPL Services $ 10 $ 10 LKE from PPL Services 6 6 PPL Electric from PPL EU Services 50 41 LG&E from LKS 42 38 KU from LKS 44 41 In addition to the charges for services noted above, LKS makes payments on behalf of LG&E and KU for fuel purchases and other costs for products or services provided by third parties. LG&E and KU also provide services to each other and to LKS. Billings between LG&E and KU relate to labor and overheads associated with union and hourly employees performing work for the other company, charges related to jointly-owned generating units and other miscellaneous charges. Tax settlements between LKE and LG&E and KU are reimbursed through LKS. Intercompany Borrowings (PPL Electric) PPL Energy Funding maintains a $650 million revolving line of credit with a PPL Electric subsidiary. No balance was outstanding at March 31, 2021 and December 31, 2020. The interest rates on borrowings are equal to one-month LIBOR plus a spread. Interest income is reflected in "Interest Income from Affiliate" on the Income Statements. (LKE) LKE maintains a $375 million revolving line of credit with a PPL Energy Funding subsidiary whereby LKE can borrow funds on a short-term basis at market-based rates. The interest rates on borrowings are equal to one-month LIBOR plus a spread. At March 31, 2021 and December 31, 2020, $227 million and $251 million were outstanding and reflected in "Notes payable with affiliates" on the Balance Sheets. The interest rates on the outstanding borrowings at March 31, 2021 and December 31, 2020 were 1.62% and 1.65%. Interest expense on the revolving line of credit was not significant for the three months ended March 31, 2021 and 2020. LKE maintains an agreement with a PPL affiliate that has a $300 million borrowing limit whereby LKE can loan funds on a short-term basis at market-based rates. No balance was outstanding at March 31, 2021 and December 31, 2020. The interest rate on the loan is based on the PPL affiliate's credit rating and equal to one-month LIBOR plus a spread. LKE maintains ten (LG&E and KU) LG&E participates in an intercompany money pool agreement whereby LKE and/or KU make available to LG&E funds up to the difference between LG&E's FERC borrowing limit and LG&E's commercial paper capacity limit at an interest rate based on the lower of a market index of commercial paper issues and two additional rate options based on LIBOR. LG&E's money pool borrowing limit is $325 million. No balances were outstanding at March 31, 2021 and December 31, 2020. KU participates in an intercompany money pool agreement whereby LKE and/or LG&E make available to KU funds up to the difference between KU's FERC borrowing limit and KU's commercial paper capacity limit at an interest rate based on the lower of a market index of commercial paper issues and two additional rate options based on LIBOR. KU's money pool borrowing limit is $300 million. No balances were outstanding at March 31, 2021 and December 31, 2020. VEBA Funds Receivable (PPL Electric) In May 2018, PPL received a favorable private letter ruling from the IRS permitting a transfer of excess funds from the PPL Bargaining Unit Retiree Health Plan VEBA to a new subaccount within the VEBA, to be used to pay medical claims of active bargaining unit employees. Based on PPL Electric's participation in PPL’s Other Postretirement Benefit plan, PPL Electric was allocated a portion of the excess funds from PPL Services. These funds have been recorded as an intercompany receivable on PPL Electric's Balance Sheets. The receivable balance decreases as PPL Electric pays incurred medical claims and is reimbursed by PPL Services. The intercompany receivable balance associated with these funds was $20 million as of March 31, 2021, of which $10 million was reflected in "Accounts receivable from affiliates" and $10 million was reflected in "Other noncurrent assets" on the PPL Electric Balance Sheet. The intercompany receivable balance associated with these funds was $22 million as of December 31, 2020, of which $10 million was reflected in "Accounts receivable from affiliates" and $12 million was reflected in "Other noncurrent assets" on the PPL Electric Balance Sheet. Other (PPL Electric, LG&E and KU)

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	14. Fair Value Measurements (All Registrants) Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (an exit price). A market approach (generally, data from market transactions), an income approach (generally, present value techniques and option-pricing models) and/or a cost approach (generally, replacement cost) are used to measure the fair value of an asset or liability, as appropriate. These valuation approaches incorporate inputs such as observable, independent market data and/or unobservable data that management believes are predicated on the assumptions market participants would use to price an asset or liability. These inputs may incorporate, as applicable, certain risks such as nonperformance risk, which includes credit risk. The fair value of a group of financial assets and liabilities is measured on a net basis. See Note 1 in each Registrant's 2020 Form 10-K for information on the levels in the fair value hierarchy. Recurring Fair Value Measurements The assets and liabilities measured at fair value were: March 31, 2021 December 31, 2020 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 PPL Assets Cash and cash equivalents $ 421 $ 421 $ — $ — $ 442 $ 442 $ — $ — Restricted cash and cash equivalents (a) 1 1 — — 1 1 — — Special use funds (a): Commingled debt fund measured at NAV (b) 25 — — — 26 — — — Commingled equity fund measured at NAV (b) 24 — — — 25 — — — Total special use funds 49 — — — 51 — — — Total assets $ 471 $ 422 $ — $ — $ 494 $ 443 $ — $ — Liabilities Price risk management liabilities (c): Interest rate swaps $ 17 $ — $ 17 $ — $ 23 $ — $ 23 $ — Total price risk management liabilities $ 17 $ — $ 17 $ — $ 23 $ — $ 23 $ — PPL Electric Assets Cash and cash equivalents $ 29 $ 29 $ — $ — $ 40 $ 40 $ — $ — Total assets $ 29 $ 29 $ — $ — $ 40 $ 40 $ — $ — LKE Assets Cash and cash equivalents $ 16 $ 16 $ — $ — $ 29 $ 29 $ — $ — Total assets $ 16 $ 16 $ — $ — $ 29 $ 29 $ — $ — Liabilities Price risk management liabilities: Interest rate swaps $ 17 $ — $ 17 $ — $ 23 $ — $ 23 $ — Total price risk management liabilities $ 17 $ — $ 17 $ — $ 23 $ — $ 23 $ — LG&E Assets Cash and cash equivalents $ 7 $ 7 $ — $ — $ 7 $ 7 $ — $ — Total assets $ 7 $ 7 $ — $ — $ 7 $ 7 $ — $ — March 31, 2021 December 31, 2020 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Liabilities Price risk management liabilities: Interest rate swaps $ 17 $ — $ 17 $ — $ 23 $ — $ 23 $ — Total price risk management liabilities $ 17 $ — $ 17 $ — $ 23 $ — $ 23 $ — KU Assets Cash and cash equivalents $ 8 $ 8 $ — $ — $ 22 $ 22 $ — $ — Total assets $ 8 $ 8 $ — $ — $ 22 $ 22 $ — $ — (a) Included in "Other current assets" on the Balance Sheets. (b) In accordance with accounting guidance, certain investments that are measured at fair value using net asset value per share (NAV), or its equivalent, have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the Balance Sheets. (c) Current portion is included in "Other current liabilities" and noncurrent portion is included in "Other deferred credits and noncurrent liabilities" on the Balance Sheets. Special Use Funds (PPL) The special use funds are investments restricted for paying active union employee medical costs. In May 2018, PPL received a favorable private letter ruling from the IRS permitting a transfer of excess funds from the PPL Bargaining Unit Retiree Health Plan VEBA to a new subaccount within the VEBA to be used to pay medical claims of active bargaining unit employees. The funds are invested primarily in commingled debt and equity funds measured at NAV and are classified as investments in equity securities. Changes in fair value of the funds are recorded to the Statements of Income. Price Risk Management Assets/Liabilities - Interest Rate Swaps/Foreign Currency Contracts/Cross-Currency Swaps ( PPL, LKE, LG&E and KU) To manage interest rate risk, PPL, LKE, LG&E and KU use interest rate contracts such as forward-starting swaps, floating-to-fixed swaps and fixed-to-floating swaps. To manage foreign currency exchange risk, PPL uses foreign currency contracts such as forwards, options and cross-currency swaps that contain characteristics of both interest rate and foreign currency contracts. An income approach is used to measure the fair value of these contracts, utilizing readily observable inputs, such as forward interest rates (e.g., LIBOR and government security rates) and forward foreign currency exchange rates (e.g., GBP), as well as inputs that may not be observable, such as credit valuation adjustments. In certain cases, market information cannot practicably be obtained to value credit risk and therefore internal models are relied upon. These models use projected probabilities of default and estimated recovery rates based on historical observances. When the credit valuation adjustment is significant to the overall valuation, the contracts are classified as Level 3. Nonrecurring Fair Value Measurements (PPL) See Note 9 for information regarding the estimated fair value of the U.K. utility business which is classified as held for sale as of March 31, 2021. Financial Instruments Not Recorded at Fair Value (All Registrants) The carrying amounts of long-term debt on the Balance Sheets and their estimated fair values are set forth below. Long-term debt is classified as Level 2. The effect of third-party credit enhancements is not included in the fair value measurement. March 31, 2021 December 31, 2020 Carrying Fair Value Carrying Fair Value PPL $ 14,691 $ 16,607 $ 14,689 $ 17,774 PPL Electric 4,237 4,881 4,236 5,338 LKE 6,075 7,051 6,074 7,589 LG&E 2,007 2,321 2,007 2,499 KU 2,618 3,042 2,618 3,334 (a) Amounts are net of debt issuance costs. The carrying amounts of other current financial instruments (except for long-term debt due within one year) approximate their fair values because of their short-term nature.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	15. Derivative Instruments and Hedging Activities Risk Management Objectives (All Registrants) PPL has a risk management policy approved by the Board of Directors to manage market risk associated with commodities, interest rates on debt issuances and foreign exchange (including price, liquidity and volumetric risk) and credit risk (including non-performance risk and payment default risk). The Risk Management Committee, comprised of senior management and chaired by the Senior Director-Risk Management, oversees the risk management function. Key risk control activities designed to ensure compliance with the risk policy and detailed programs include, but are not limited to, credit review and approval, validation of transactions, verification of risk and transaction limits, value-at-risk analyses (VaR, a statistical model that attempts to estimate the value of potential loss over a given holding period under normal market conditions at a given confidence level) and the coordination and reporting of the Enterprise Risk Management program. Market Risk Market risk includes the potential loss that may be incurred as a result of price changes associated with a particular financial or commodity instrument as well as market liquidity and volumetric risks. Forward contracts, futures contracts, options, swaps and structured transactions are utilized as part of risk management strategies to minimize unanticipated fluctuations in earnings caused by changes in commodity prices, interest rates and foreign currency exchange rates. Many of these contracts meet the definition of a derivative. All derivatives are recognized on the Balance Sheets at their fair value, unless NPNS is elected. The following summarizes the market risks that affect PPL and its subsidiaries. Interest Rate Risk • PPL and its subsidiaries are exposed to interest rate risk associated with forecasted fixed-rate and existing floating-rate debt issuances. PPL and WPD hold over-the-counter cross currency swaps to limit exposure to market fluctuations on interest and principal payments from changes in foreign currency exchange rates and interest rates. PPL, LKE and LG&E utilize over-the-counter interest rate swaps to limit exposure to market fluctuations on floating-rate debt. PPL, LKE, LG&E and KU utilize forward starting interest rate swaps to hedge changes in benchmark interest rates, when appropriate, in connection with future debt issuances. • PPL and its subsidiaries are exposed to interest rate risk associated with debt securities and derivatives held by defined benefit plans. This risk is significantly mitigated to the extent that the plans are sponsored at, or sponsored on behalf of, the regulated domestic utilities and for certain plans at WPD due to the recovery methods in place. Foreign Currency Risk (PPL) • PPL is exposed to foreign currency exchange risk primarily associated with its investments in and earnings of U.K. affiliates. (All Registrants) Commodity Price Risk PPL is exposed to commodity price risk through its domestic subsidiaries as described below. • PPL Electric is required to purchase electricity to fulfill its obligation as a PLR. Potential commodity price risk is insignificant and mitigated through its PUC-approved cost recovery mechanism and full-requirement supply agreements to serve its PLR customers which transfer the risk to energy suppliers. • LG&E's and KU's rates include certain mechanisms for fuel, fuel-related expenses and energy purchases. In addition, LG&E's rates include a mechanism for natural gas supply expenses. These mechanisms generally provide for timely recovery of market price fluctuations associated with these expenses. Volumetric Risk Volumetric risk is the risk related to the changes in volume of retail sales due to weather, economic conditions or other factors. PPL is exposed to volumetric risk through its subsidiaries as described below. • WPD is exposed to volumetric risk which is significantly mitigated as a result of the method of regulation in the U.K. Under the RIIO-ED1 price control regulations, recovery of such exposure occurs on a two year lag. See Note 1 in PPL's 2020 Form 10-K for additional information on revenue recognition under RIIO-ED1. • PPL Electric, LG&E and KU are exposed to volumetric risk on retail sales, mainly due to weather and other economic conditions for which there is limited mitigation between rate cases. Equity Securities Price Risk • PPL and its subsidiaries are exposed to equity securities price risk associated with the fair value of the defined benefit plans' assets. This risk is significantly mitigated at the regulated domestic utilities and for certain plans at WPD due to the recovery methods in place. • PPL is exposed to equity securities price risk from future stock sales and/or purchases. Credit Risk Credit risk is the potential loss that may be incurred due to a counterparty's non-performance. PPL is exposed to credit risk from "in-the-money" interest rate derivatives with financial institutions, as well as additional credit risk through certain of its subsidiaries, as discussed below. In the event a supplier of PPL Electric, LG&E or KU defaults on its obligation, those Registrants would be required to seek replacement power or replacement fuel in the market. In general, subject to regulatory review or other processes, appropriate incremental costs incurred by these entities would be recoverable from customers through applicable rate mechanisms, thereby mitigating the financial risk for these entities. PPL and its subsidiaries have credit policies in place to manage credit risk, including the use of an established credit approval process, daily monitoring of counterparty positions and the use of master netting agreements or provisions. These agreements generally include credit mitigation provisions, such as margin, prepayment or collateral requirements. PPL and its subsidiaries may request additional credit assurance, in certain circumstances, in the event that the counterparties' credit ratings fall below investment grade, their tangible net worth falls below specified percentages or their exposures exceed an established credit limit. Master Netting Arrangements (PPL, LKE, LG&E and KU) Net derivative positions on the balance sheets are not offset against the right to reclaim cash collateral (a receivable) or the obligation to return cash collateral (a payable) under master netting arrangements. PPL had no obligation and an immaterial obligation to return cash collateral under master netting arrangements at March 31, 2021 and December 31, 2020. PPL had a $22 million obligation and no obligation to post cash collateral under master netting arrangements at March 31, 2021 and December 31, 2020. LKE, LG&E and KU had no obligation to return cash collateral under master netting arrangements at March 31, 2021 and December 31, 2020. LKE, LG&E and KU had no obligation to post cash collateral under master netting arrangements at March 31, 2021.and December 31, 2020. See "Offsetting Derivative Instruments" below for a summary of derivative positions presented in the balance sheets where a right of setoff exists under these arrangements. Interest Rate Risk (All Registrants) PPL and its subsidiaries issue debt to finance their operations, which exposes them to interest rate risk. A variety of financial derivative instruments are utilized to adjust the mix of fixed and floating interest rates in their debt portfolios, adjust the duration of the debt portfolios and lock in benchmark interest rates in anticipation of future financing, when appropriate. Risk limits under PPL's risk management program are designed to balance risk exposure to volatility in interest expense and changes in the fair value of the debt portfolio due to changes in benchmark interest rates. In addition, the interest rate risk of certain subsidiaries is potentially mitigated as a result of the existing regulatory framework or the timing of rate cases. Cash Flow Hedges (PPL) Interest rate risks include exposure to adverse interest rate movements for outstanding variable rate debt and for future anticipated financings. Financial interest rate swap contracts that qualify as cash flow hedges may be entered into to hedge floating interest rate risk associated with both existing and anticipated debt issuances. PPL had no such contracts at March 31, 2021. At March 31, 2021, PPL held an aggregate notional value in cross-currency interest rate swap contracts of $202 million that mature in 2028 to hedge the interest payments and principal of WPD's U.S. dollar-denominated senior notes. In March 2021, $500 million of WPD's U.S. dollar-denominated senior notes were repaid prior to maturity and $500 million notional value of cross-currency interest rate swap contracts matured. Cash flow hedges are discontinued if it is no longer probable that the original forecasted transaction will occur by the end of the originally specified time period and any amounts previously recorded in AOCI are reclassified into earnings once it is determined that the hedged transaction is not probable of occurring. For the three months ended March 31, 2021 and 2020, PPL had no cash flow hedges reclassified into earnings associated with discontinued cash flow hedges. At March 31, 2021, the amount of accumulated net unrecognized after-tax gains (losses) on qualifying derivatives expected to be reclassified into earnings during the next 12 months is insignificant. Amounts are reclassified as the hedged interest expense is recorded. Economic Activity (PPL, LKE and LG&E) LG&E enters into interest rate swap contracts that economically hedge interest payments. Because realized gains and losses from the swaps, including terminated swap contracts, are recoverable through regulated rates, any subsequent changes in fair value of these derivatives are included in regulatory assets or liabilities until they are realized as interest expense. Realized gains and losses are recognized in "Interest Expense" on the Statements of Income at the time the underlying hedged interest expense is recorded. At March 31, 2021, LG&E held contracts with a notional amount of $64 million that mature in 2033. Foreign Currency Risk (PPL) PPL is exposed to foreign currency risk, primarily through investments in and earnings of U.K. affiliates. PPL has adopted a foreign currency risk management program designed to hedge certain foreign currency exposures, including firm commitments, recognized assets or liabilities, anticipated transactions, including the anticipated sale of its U.K. utility business and net investments. In addition, PPL enters into financial instruments to protect against foreign currency translation risk of expected GBP earnings. Net Investment Hedges PPL enters into foreign currency contracts on behalf of a subsidiary to protect the value of a portion of its net investment in WPD. There were no contracts outstanding at March 31, 2021. At March 31, 2021 and December 31, 2020, PPL had $33 million of accumulated net investment hedge after tax gains (losses) that were included in the foreign currency translation adjustment component of AOCI. Economic Activity PPL enters into foreign currency contracts on behalf of a subsidiary to economically hedge GBP-denominated anticipated earnings and anticipated transactions, including the anticipated sale of its U.K. utility business. At March 31, 2021, the total exposure hedged by PPL was approximately £7.5 billion. Accounting and Reporting (All Registrants) All derivative instruments are recorded at fair value on the Balance Sheet as an asset or liability unless NPNS is elected. NPNS contracts include certain full requirement purchase contracts and other physical purchase contracts. Changes in the fair value of derivatives not designated as NPNS are recognized in earnings unless specific hedge accounting criteria are met and designated as such, except for the changes in fair values of LG&E's interest rate swaps that are recognized as regulatory assets or regulatory liabilities. See Note 7 for amounts recorded in regulatory assets and regulatory liabilities at March 31, 2021 and December 31, 2020. See Note 1 in each Registrant's 2020 Form 10-K for additional information on accounting policies related to derivative instruments. (PPL) The following table presents the fair value and location of derivative instruments recorded on the Balance Sheets. March 31, 2021 December 31, 2020 Derivatives designated as Derivatives not designated Derivatives designated as Derivatives not designated Assets Liabilities Assets Liabilities Assets Liabilities Assets Liabilities Current: Price Risk Management Assets/Liabilities: Interest rate swaps (a) (b) $ — $ 1 $ — $ — $ — $ — $ — $ 2 Cross-currency swaps (c) 2 — — — 94 — — — Foreign currency contracts (c) — — 23 180 — — — 137 Total current 2 1 23 180 94 — — 139 Noncurrent: Price Risk Management Assets/Liabilities: Interest rate swaps (a) (b) — 16 — — — — — 21 Cross-currency swaps (c) 37 — — — 52 — — — Total noncurrent 37 16 — — 52 — — 21 Total derivatives $ 39 $ 17 $ 23 $ 180 $ 146 $ — $ — $ 160 (a) Current portion is included in "Price risk management assets" and "Other current liabilities" and noncurrent portion is included in "Price risk management assets" and "Other deferred credits and noncurrent liabilities" on the Balance Sheets. (b) Excludes accrued interest, if applicable. (c) Included in "Current assets held for sale" and "Current liabilities held for sale" on the Balance Sheets. The following tables present the pre-tax effect of derivative instruments recognized in income, OCI or regulatory assets and regulatory liabilities for the period ended March 31, 2021. Three Months Three Months Derivative Derivative Gain Location of Gain (Loss) Cash Flow Hedges: Interest rate swaps $ — Interest expense $ (1) Income (Loss) from Discontinued Operations (net of taxes) (1) Cross-currency swaps (46) Income (Loss) from Discontinued Operations (net of taxes) (37) Total $ (46) $ (39) Derivatives Not Designated as Location of Gain (Loss) Recognized in Three Months Foreign currency contracts Income (Loss) from Discontinued Operations (net of taxes) $ (25) Interest rate swaps Interest expense (1) Total $ (26) Derivatives Not Designated as Location of Gain (Loss) Recognized as Three Months Interest rate swaps Regulatory assets - noncurrent $ 6 The following tables present the pre-tax effect of derivative instruments recognized in income, OCI or regulatory assets and regulatory liabilities for the period ended March 31, 2020. Three Months Three Months Derivative Derivative Gain Location of Gain (Loss) Cash Flow Hedges: Interest rate swaps $ (5) Interest expense $ (2) Income (Loss) from Discontinued Operations (net of taxes) (1) Cross-currency swaps 15 Income (Loss) from Discontinued Operations (net of taxes) 6 Total $ 10 $ 3 Derivatives Not Designated as Location of Gain (Loss) Recognized in Three Months Foreign currency contracts Income (Loss) from Discontinued operations (net of taxes) $ 62 Interest rate swaps Interest expense (1) Total $ 61 Derivatives Not Designated as Location of Gain (Loss) Recognized as Three Months Interest rate swaps Regulatory assets - noncurrent $ (8) The following table presents the effect of cash flow hedge activity on the Statement of Income for the period ended March 31, 2021. Location and Amount of Gain (Loss) Recognized in Income on Hedging Relationships Three Months Interest Expense Income (Loss) from Discontinued Operations (net of income taxes) Total income and expense line items presented in the income statement in which the effect of cash flow hedges are recorded $ 153 $ (2,043) The effects of cash flow hedges: Gain (Loss) on cash flow hedging relationships: Interest rate swaps: Amount of gain (loss) reclassified from AOCI to income (1) (1) Cross-currency swaps: Hedged items — 37 Amount of gain (loss) reclassified from AOCI to Income — (37) The following table presents the effect of cash flow hedge activity on the Statement of Income for the period ended March 31, 2020. Location and Amount of Gain (Loss) Recognized in Income on Hedging Relationships Three Months Interest Expense Income (Loss) from Discontinued Operations (net of taxes) Total income and expense line items presented in the income statement in which the effect of cash flow hedges are recorded $ 154 $ 350 The effects of cash flow hedges: Gain (Loss) on cash flow hedging relationships: Interest rate swaps: Amount of gain (loss) reclassified from AOCI to income (2) (1) Cross-currency swaps: Hedged items — (6) Amount of gain (loss) reclassified from AOCI to Income — 6 (LKE and LG&E) The following table presents the fair value and the location on the Balance Sheets of derivatives not designated as hedging instruments. March 31, 2021 December 31, 2020 Assets Liabilities Assets Liabilities Current: Price Risk Management Assets/Liabilities: Interest rate swaps $ — $ 1 $ — $ 2 Total current — 1 — 2 Noncurrent: Price Risk Management Assets/Liabilities: Interest rate swaps — 16 — 21 Total noncurrent — 16 — 21 Total derivatives $ — $ 17 $ — $ 23 The following tables present the pre-tax effect of derivatives not designated as cash flow hedges that are recognized in income or regulatory assets for the period ended March 31, 2021. Location of Gain (Loss) Recognized in Derivative Instruments Income on Derivatives Three Months Interest rate swaps Interest expense $ (1) Location of Gain (Loss) Recognized in Derivative Instruments Regulatory Assets Three Months Interest rate swaps Regulatory assets - noncurrent $ 6 The following tables present the pre-tax effect of derivatives not designated as cash flow hedges that are recognized in income or regulatory assets for the period ended March 31, 2020. Location of Gain (Loss) Recognized in Derivative Instruments Income on Derivatives Three Months Interest rate swaps Interest expense $ (1) Location of Gain (Loss) Recognized in Derivative Instruments Regulatory Assets Three Months Interest rate swaps Regulatory assets - noncurrent $ (8) (PPL, LKE, LG&E and KU) Offsetting Derivative Instruments PPL, LKE, LG&E and KU or certain of their subsidiaries have master netting arrangements in place and also enter into agreements pursuant to which they purchase or sell certain energy and other products. Under the agreements, upon termination of the agreement as a result of a default or other termination event, the non-defaulting party typically would have a right to set off amounts owed under the agreement against any other obligations arising between the two parties (whether under the agreement or not), whether matured or contingent and irrespective of the currency, place of payment or place of booking of the obligation. PPL, LKE, LG&E and KU have elected not to offset derivative assets and liabilities and not to offset net derivative positions against the right to reclaim cash collateral pledged (an asset) or the obligation to return cash collateral received (a liability) under derivatives agreements. The table below summarizes the derivative positions presented in the balance sheets where a right of setoff exists under these arrangements and related cash collateral received or pledged. Assets Liabilities Eligible for Offset Eligible for Offset Gross Derivative Cash Net Gross Derivative Cash Net March 31, 2021 Treasury Derivatives PPL $ 62 $ 18 $ — $ 44 $ 197 $ 18 $ 22 $ 157 LKE — — — — 17 — — 17 LG&E — — — — 17 — — 17 Assets Liabilities Eligible for Offset Eligible for Offset Gross Derivative Cash Net Gross Derivative Cash Net December 31, 2020 Treasury Derivatives PPL $ 146 $ 34 $ — $ 112 $ 160 $ 34 $ — $ 126 LKE — — — — 23 — — 23 LG&E — — — — 23 — — 23 Credit Risk-Related Contingent Features Certain derivative contracts contain credit risk-related contingent features which, when in a net liability position, would permit the counterparties to require the transfer of additional collateral upon a decrease in the credit ratings of PPL, LKE, LG&E and KU or certain of their subsidiaries. Most of these features would require the transfer of additional collateral or permit the counterparty to terminate the contract if the applicable credit rating were to fall below investment grade. Some of these features also would allow the counterparty to require additional collateral upon each downgrade in credit rating at levels that remain above investment grade. In either case, if the applicable credit rating were to fall below investment grade, and assuming no assignment to an investment grade affiliate were allowed, most of these credit contingent features require either immediate payment of the net liability as a termination payment or immediate and ongoing full collateralization on derivative instruments in net liability positions. Additionally, certain derivative contracts contain credit risk-related contingent features that require adequate assurance of performance be provided if the other party has reasonable concerns regarding the performance of PPL's, LKE's, LG&E's and KU's obligations under the contracts. A counterparty demanding adequate assurance could require a transfer of additional collateral or other security, including letters of credit, cash and guarantees from a creditworthy entity. This would typically involve negotiations among the parties. However, amounts disclosed below represent assumed immediate payment or immediate and ongoing full collateralization for derivative instruments in net liability positions with "adequate assurance" features. (PPL) At March 31, 2021, derivative contracts in a net liability position that contain credit risk-related contingent features, collateral posted on those positions and the related effect of a decrease in credit ratings below investment grade are summarized as follows: PPL Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features $ 161 Aggregate fair value of collateral posted on these derivative instruments 22 Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade (a) 139 (a) Includes the effect of net receivables and payables already recorded on the Balance Sheet.

Asset Retirement Obligations

Asset Retirement Obligations	3 Months Ended
	Mar. 31, 2021
Asset Retirement Obligations [Line Items]
Asset Retirement Obligations	16. Asset Retirement Obligations (PPL, LKE, LG&E and KU) PPL's, LKE's, LG&E's and KU's ARO liabilities are primarily related to CCR closure costs. See Note 11 for information on the CCR rule. LG&E also has AROs related to natural gas mains and wells. LG&E's and KU's transmission and distribution lines largely operate under perpetual property easement agreements, which do not generally require restoration upon removal of the property. Therefore, no material AROs are recorded for transmission and distribution assets. For LKE, LG&E and KU, all ARO accretion and depreciation expenses are reclassified as a regulatory asset. ARO regulatory assets associated with certain CCR projects are amortized to expense in accordance with regulatory approvals. For other AROs, at the time of retirement, the related ARO regulatory asset is offset against the associated cost of removal regulatory liability, PP&E and ARO liability. The changes in the carrying amounts of AROs were as follows. PPL LKE LG&E KU Balance at December 31, 2020 $ 182 $ 182 $ 67 $ 115 Accretion 4 4 1 3 Obligations settled (15) (15) (6) (9) Balance at March 31, 2021 $ 171 $ 171 $ 62 $ 109
LG And E And KU Energy LLC [Member]
Asset Retirement Obligations [Line Items]
Asset Retirement Obligations	16. Asset Retirement Obligations (PPL, LKE, LG&E and KU) PPL's, LKE's, LG&E's and KU's ARO liabilities are primarily related to CCR closure costs. See Note 11 for information on the CCR rule. LG&E also has AROs related to natural gas mains and wells. LG&E's and KU's transmission and distribution lines largely operate under perpetual property easement agreements, which do not generally require restoration upon removal of the property. Therefore, no material AROs are recorded for transmission and distribution assets. For LKE, LG&E and KU, all ARO accretion and depreciation expenses are reclassified as a regulatory asset. ARO regulatory assets associated with certain CCR projects are amortized to expense in accordance with regulatory approvals. For other AROs, at the time of retirement, the related ARO regulatory asset is offset against the associated cost of removal regulatory liability, PP&E and ARO liability. The changes in the carrying amounts of AROs were as follows. PPL LKE LG&E KU Balance at December 31, 2020 $ 182 $ 182 $ 67 $ 115 Accretion 4 4 1 3 Obligations settled (15) (15) (6) (9) Balance at March 31, 2021 $ 171 $ 171 $ 62 $ 109
Louisville Gas And Electric Co [Member]
Asset Retirement Obligations [Line Items]
Asset Retirement Obligations	16. Asset Retirement Obligations (PPL, LKE, LG&E and KU) PPL's, LKE's, LG&E's and KU's ARO liabilities are primarily related to CCR closure costs. See Note 11 for information on the CCR rule. LG&E also has AROs related to natural gas mains and wells. LG&E's and KU's transmission and distribution lines largely operate under perpetual property easement agreements, which do not generally require restoration upon removal of the property. Therefore, no material AROs are recorded for transmission and distribution assets. For LKE, LG&E and KU, all ARO accretion and depreciation expenses are reclassified as a regulatory asset. ARO regulatory assets associated with certain CCR projects are amortized to expense in accordance with regulatory approvals. For other AROs, at the time of retirement, the related ARO regulatory asset is offset against the associated cost of removal regulatory liability, PP&E and ARO liability. The changes in the carrying amounts of AROs were as follows. PPL LKE LG&E KU Balance at December 31, 2020 $ 182 $ 182 $ 67 $ 115 Accretion 4 4 1 3 Obligations settled (15) (15) (6) (9) Balance at March 31, 2021 $ 171 $ 171 $ 62 $ 109
Kentucky Utilities Co [Member]
Asset Retirement Obligations [Line Items]
Asset Retirement Obligations	16. Asset Retirement Obligations (PPL, LKE, LG&E and KU) PPL's, LKE's, LG&E's and KU's ARO liabilities are primarily related to CCR closure costs. See Note 11 for information on the CCR rule. LG&E also has AROs related to natural gas mains and wells. LG&E's and KU's transmission and distribution lines largely operate under perpetual property easement agreements, which do not generally require restoration upon removal of the property. Therefore, no material AROs are recorded for transmission and distribution assets. For LKE, LG&E and KU, all ARO accretion and depreciation expenses are reclassified as a regulatory asset. ARO regulatory assets associated with certain CCR projects are amortized to expense in accordance with regulatory approvals. For other AROs, at the time of retirement, the related ARO regulatory asset is offset against the associated cost of removal regulatory liability, PP&E and ARO liability. The changes in the carrying amounts of AROs were as follows. PPL LKE LG&E KU Balance at December 31, 2020 $ 182 $ 182 $ 67 $ 115 Accretion 4 4 1 3 Obligations settled (15) (15) (6) (9) Balance at March 31, 2021 $ 171 $ 171 $ 62 $ 109

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss)	17. Accumulated Other Comprehensive Income (Loss) (PPL) The after-tax changes in AOCI by component for the periods ended March 31 were as follows. Foreign Unrealized gains (losses) Defined benefit plans (b) Prior Actuarial Total PPL December 31, 2020 $ (1,158) $ — $ (16) $ (3,046) $ (4,220) Amounts arising during the period 303 (30) — — 273 Reclassifications from AOCI — 25 — 40 65 Net OCI during the period 303 (5) — 40 338 March 31, 2021 $ (855) $ (5) $ (16) $ (3,006) $ (3,882) December 31, 2019 $ (1,425) $ (5) $ (18) $ (2,910) $ (4,358) Amounts arising during the period (61) 8 — — (53) Reclassifications from AOCI — (3) 1 47 45 Net OCI during the period (61) 5 1 47 (8) March 31, 2020 $ (1,486) $ — $ (17) $ (2,863) $ (4,366) (a) Amounts relate to operations of the U.K. utility business. (b) Substantially all of the amounts relate to pension plans of the U.K. utility business. At March 31, 2021, the combined accumulated other comprehensive loss related to these plans was $2.8 billion. The following table presents PPL's gains (losses) and related income taxes for reclassifications from AOCI for the periods ended March 31. Three Months Affected Line Item on the Details about AOCI 2021 2020 Statements of Income Qualifying derivatives Interest rate swaps $ (1) $ (2) Interest Expense (1) (1) Income (Loss) from Discontinued Operations (net of income taxes) Cross-currency swaps (37) 6 Income (Loss) from Discontinued Operations (net of income taxes) Total Pre-tax (39) 3 Income Taxes 14 — Total After-tax (25) 3 Defined benefit plans Prior service costs (a) — (1) Net actuarial loss (a) (62) (59) Total Pre-tax (62) (60) Income Taxes 22 12 Total After-tax (40) (48) Total reclassifications during the period $ (65) $ (45) (a) These AOCI components are included in the computation of net periodic defined benefit cost. See Note 10 for additional information.

Acquisitions, Development and D

Acquisitions, Development and Divestitures (Tables)	3 Months Ended
	Mar. 31, 2021
Business Combinations [Abstract]
Disposal Group, Including Discontinued Operation, Income Statement Line Items	Following are the components of discontinued operations in the Statements of Income for the periods ended March 31: Three Months 2021 2020 Operating Revenues $ 634 $ 614 Operating Expenses 252 222 Other Income (Expense) - net 66 130 Interest Expense (a) 93 93 Income before income taxes 355 429 Loss on sale (1,647) — Income tax expense (b) 751 79 Income (loss) from Discontinued Operations (net of income taxes) $ (2,043) $ 350 (a) No interest from corporate level debt was allocated to discontinued operations. (b) 2021 primarily includes a federal tax expense of $689 million for the recognition of the tax cost associated with the realization of the book-tax outside basis difference in PPL's investment in the U.K. utility business and foreign tax expense of $73 million on current year operations.
Disposal Group, Including Discontinued Operation, Assets and Liabilities	The following major classes of assets and liabilities were reclassified on PPL's Balance Sheet as of March 31, 2021 and December 31, 2020: Held for Sale at March 31, 2021 Held for Sale at December 31, 2020 Cash and cash equivalents $ 152 $ 266 Accounts receivable and unbilled revenues 459 389 Price risk management assets 62 146 Property, plant and equipment, net (a) 15,236 14,392 Goodwill (b) 1,029 2,558 Other intangibles 434 413 Pension benefit asset 911 682 Other assets 142 137 Total Assets $ 18,425 $ 18,983 Short-term debt and long-term debt due within one year $ 812 $ 994 Accounts payable 199 220 Customer deposits 240 217 Accrued interest 178 190 Long-term debt 8,297 7,938 Total deferred income taxes 1,123 1,032 Price risk management liabilities 180 137 Other deferred credits and liabilities 347 295 Total Liabilities $ 11,376 $ 11,023 Net assets (c) $ 7,049 $ 7,960 (a) Depreciation of fixed assets ceased upon classification as held for sale. (b) The change in Goodwill is due to the loss on sale of $1,647 million and a gain on foreign currency translation of $118 million.
Disposal Group, Including Discontinued Operation, Components of Gain (loss) on Sale	Accordingly, PPL’s investment in the U.K. utility business has been reported at its estimated fair value, less costs to sell, resulting in an estimated pre-tax loss on sale of $1.6 billion as of March 31, 2021, as determined below. Three Months 2021 Sales proceeds (a) $ 10,806 Costs to sell (b) 48 Carrying value (c) 12,405 Loss on Sale (d) (1,647) (a) Amount represents a contractual selling price of £7.8 billion (a Level 1 fair value measurement) as well as accrued additional consideration of approximately £49 million converted at the March 31, 2021 spot rate of $1.38 per GBP. (b) Estimated amounts incurred for bank advisory, legal and accounting fees to facilitate the transaction. (c) The measurement of PPL’s carrying value of the U.K. utility business includes the realization of accumulated other comprehensive losses of $3.7 billion, which arose primarily from currency translation adjustments and defined benefit plans associated with the U.K. utility business. (d) This loss has been recorded as a reduction to goodwill.

Interim Financial Statements

Interim Financial Statements	3 Months Ended
	Mar. 31, 2021
Interim Financial Statements [Abstract]
Interim Financial Statements	1. Interim Financial Statements (All Registrants) Capitalized terms and abbreviations appearing in the unaudited combined notes to condensed financial statements are defined in the glossary. Dollars are in millions, except per share data, unless otherwise noted. The specific Registrant to which disclosures are applicable is identified in parenthetical headings in italics above the applicable disclosure or within the applicable disclosure for each Registrant's related activities and disclosures. Within combined disclosures, amounts are disclosed for any Registrant when significant. The accompanying unaudited condensed financial statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X and, therefore, do not include all of the information and footnote disclosures required by GAAP for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation in accordance with GAAP are reflected in the condensed financial statements. All adjustments are of a normal recurring nature, except as otherwise disclosed. Each Registrant's Balance Sheet at December 31, 2020 is derived from that Registrant's 2020 audited Balance Sheet. The financial statements and notes thereto should be read in conjunction with the financial statements and notes contained in each Registrant's 2020 Form 10-K. The results of operations for the three months ended March 31, 2021 are not necessarily indicative of the results to be expected for the full year ending December 31, 2021 or other future periods, because results for interim periods can be disproportionately influenced by various factors, developments and seasonal variations. (PPL ) On March 17, 2021, PPL WPD Limited entered into a share purchase agreement to sell PPL's U.K. utility business, which substantially represents PPL’s U.K. Regulated segment, to a subsidiary of National Grid plc. The results of operations of the U.K. utility business have been classified as Discontinued Operations on PPL's Statements of Income. The assets and liabilities of the U.K. utility business have been classified as assets and liabilities held for sale on PPL's Balance Sheets. PPL has elected

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies (All Registrants) The following accounting policy disclosures represent updates to Note 1 in each Registrant's 2020 Form 10-K and should be read in conjunction with those disclosures. Restricted Cash and Cash Equivalents (PPL) Reconciliation of Cash, Cash Equivalents and Restricted Cash The following provides a reconciliation of Cash, Cash Equivalents and Restricted Cash reported within the Balance Sheets that sum to the total of the same amounts shown on the Statements of Cash Flows: PPL March 31, December 31, Cash and cash equivalents $ 421 $ 442 Restricted cash - current (a) 1 1 Total Cash, Cash Equivalents and Restricted Cash $ 422 $ 443 (a) Bank deposits and other cash equivalents that are restricted by agreement or that have been clearly designated for a specific purpose are classified as restricted cash. On the Balance Sheets, the current portion of restricted cash is included in "Other current assets." Current Expected Credit Losses (All Registrants) The following table shows changes in the allowance for credit losses for the three months ended March 31, 2021: Balance at Charged to Income Deductions (a) Balance at PPL Accounts Receivable - Customer and Unbilled Revenue $ 44 $ 2 $ 1 $ 45 Other (b) 28 — — 28 PPL Electric Accounts Receivable - Customer and Unbilled Revenue $ 39 $ 1 $ — $ 40 Other 1 — — 1 LKE Accounts Receivable - Customer and Unbilled Revenue $ 5 $ 1 $ 1 $ 5 Other (b) 27 — — 27 LG&E Accounts Receivable - Customer and Unbilled Revenue $ 3 $ — $ — $ 3 KU Accounts Receivable - Customer and Unbilled Revenue $ 2 $ 1 $ 1 $ 2 (a) Primarily related to uncollectible accounts receivable written off. (b) Primarily related to receivables at WKE, which are fully reserved.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	3 Months Ended
	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	4. Revenue from Contracts with Customers (All Registrants) See Note 3 in PPL's 2020 Form 10-K for a discussion of the principal activities from which the Registrants and PPL’s segments generate their revenues. The following tables reconcile "Operating Revenues" included in each Registrant's Statement of Income with revenues generated from contracts with customers for the periods ended March 31. 2021 Three Months PPL PPL Electric LKE LG&E KU Operating Revenues (a) $ 1,498 $ 605 $ 885 $ 428 $ 469 Revenues derived from: Alternative revenue programs (b) 24 22 2 — 2 Other (c) (6) — (6) (3) (3) Revenues from Contracts with Customers $ 1,516 $ 627 $ 881 $ 425 $ 468 2020 Three Months PPL PPL Electric LKE LG&E KU Operating Revenues (a) $ 1,440 $ 608 $ 825 $ 407 $ 432 Revenues derived from: Alternative revenue programs (b) (3) — (3) (3) — Other (c) (8) (2) (6) (3) (3) Revenues from Contracts with Customers $ 1,429 $ 606 $ 816 $ 401 $ 429 (a) PPL Electric and LKE represent revenues from external customers reported by the Pennsylvania Regulated and Kentucky Regulated segments. See Note 3 for additional information. (b) Alternative revenue programs include the transmission formula rate for PPL Electric, the ECR and DSM programs for LG&E and KU, the GLT program for LG&E, and the generation formula rate for KU. For PPL Electric, the three months ended March 31, 2021 includes a $27 million reserve recorded as a result of a challenge to the transmission formula rate return on equity. See Note 7 for further information. This line item shows the over/under collection of these rate mechanisms with over-collections of revenue shown as positive amounts in the table above and under-collections shown as negative amounts. (c) Represents additional revenues outside the scope of revenues from contracts with customers, such as lease and other miscellaneous revenues. The following tables show revenues from contracts with customers disaggregated by customer class for the periods ended March 31. 2021 Three Months PPL PPL Electric LKE LG&E KU Residential $ 774 $ 361 $ 413 $ 205 $ 208 Commercial 313 82 231 121 110 Industrial 152 12 140 46 94 Other (a) 91 12 71 34 37 Wholesale - municipality 6 — 6 — 6 Wholesale - other (b) 20 — 20 19 13 Transmission 160 160 — — — Revenues from Contracts with Customers $ 1,516 $ 627 $ 881 $ 425 $ 468 2020 Three Months PPL PPL Electric LKE LG&E KU Residential $ 714 $ 344 $ 370 $ 187 $ 183 Commercial 312 81 231 124 107 Industrial 144 8 136 45 91 Other (a) 87 14 66 28 38 Wholesale - municipality 5 — 5 — 5 Wholesale - other (b) 8 — 8 17 5 Transmission 159 159 — — — Revenues from Contracts with Customers $ 1,429 $ 606 $ 816 $ 401 $ 429 (a) Primarily includes revenues from pole attachments, street lighting, other public authorities and other non-core businesses. (b) Includes wholesale power and transmission revenues. LG&E and KU amounts include intercompany power sales and transmission revenues, which are eliminated upon consolidation at LKE. As discussed in Note 2 in PPL's 2020 Form 10-K, PPL segments its business by geographic location. Revenues from external customers for each segment/geographic location are reconciled to revenues from contracts with customers in the footnotes to the tables above. Contract receivables from customers are primarily included in "Accounts receivable - Customer" and "Unbilled revenues" on the Balance Sheets. The following table shows the accounts receivable and unbilled revenues balances that were impaired for the periods ended March 31. Three Months 2021 2020 PPL $ 2 $ 6 PPL Electric 1 4 LKE 1 2 LG&E — 1 KU 1 1 The following table shows the balances and certain activity of contract liabilities resulting from contracts with customers. PPL PPL Electric LKE LG&E KU Contract liabilities at December 31, 2020 $ 40 $ 23 $ 11 $ 5 $ 6 Contract liabilities at March 31, 2021 33 16 10 5 5 Revenue recognized during the three months ended March 31, 2021 that was included in the contract liability balance at December 31, 2020 21 9 11 5 6 Contract liabilities at December 31, 2019 $ 37 $ 21 $ 9 $ 5 $ 4 Contract liabilities at March 31, 2020 34 15 14 10 4 Revenue recognized during the three months ended March 31, 2020 that was included in the contract liability balance at December 31, 2019 19 8 9 5 4 Contract liabilities result from recording contractual billings in advance for customer attachments to the Registrants' infrastructure and payments received in excess of revenues earned to date. Advanced billings for customer attachments are recognized as revenue ratably over the billing period. Payments received in excess of revenues earned to date are recognized as revenue as services are delivered in subsequent periods. At March 31, 2021, PPL had $47 million of performance obligations attributable to Corporate and Other that have not been satisfied. Of this amount, PPL expects to recognize approximately $38 million within the next 12 months.

Acquisitions, Development and_2

Acquisitions, Development and Divestitures	3 Months Ended
	Mar. 31, 2021
Business Combinations [Abstract]
Mergers, Acquisitions and Dispositions Disclosures	9. Acquisitions, Development and Divestitures (PPL) Discontinued Operations Share Purchase Agreement to Sell U.K. Utility Business On March 17, 2021, PPL WPD Limited (WPD Limited) entered into a share purchase agreement (WPD SPA) to sell PPL's U.K. utility business to National Grid Holdings One plc (National Grid U.K.), a subsidiary of National Grid plc. Pursuant to the WPD SPA, National Grid U.K. will acquire 100% of the issued share capital of PPL WPD Investments Limited (WPD Investments) for £7.8 billion in cash. WPD Limited will also receive an additional amount of £548,000 for each day during the period from January 1, 2021 to the closing date if the dividends usually declared by WPD Investments to WPD Limited are not paid for that period. The completion of the transaction, which is currently expected to occur by the end of July 2021, is subject to approval by National Grid plc's shareholders and receipt of regulatory approvals from the Financial Conduct Authority (the FCA), the Guernsey Financial Services Commission and, if applicable at the time of closing, from the U.K. Secretary of State in connection with the National Security and Investment Bill 2020. On April 22, 2021, National Grid plc’s shareholders approved the transaction pursuant to the listing rules of the FCA. On May 4, 2021, the Guernsey Financial Services Commission approved the transaction. The approval of the FCA is the sole remaining approval before the transaction can be consummated. WPD Limited and National Grid U.K. have each made customary representations and warranties in the WPD SPA, as well as certain customary covenants by WPD Limited to conduct the businesses that are subject to the WPD SPA in the ordinary course between the execution of the WPD SPA and the closing of the sale. National Grid U.K., at its expense, has purchased warranty and indemnity insurance. The consummation of the transaction is not subject to a financing condition. PPL will not have any significant involvement with the U.K. utility business after completion of the sale. Loss on Sale In connection with entering into the WPD SPA, the U.K. utility business has met the accounting criteria to be classified as assets and liabilities held for sale and discontinued operations beginning with the first quarter of 2021. Accordingly, PPL’s investment in the U.K. utility business has been reported at its estimated fair value, less costs to sell, resulting in an estimated pre-tax loss on sale of $1.6 billion as of March 31, 2021, as determined below. Three Months 2021 Sales proceeds (a) $ 10,806 Costs to sell (b) 48 Carrying value (c) 12,405 Loss on Sale (d) (1,647) (a) Amount represents a contractual selling price of £7.8 billion (a Level 1 fair value measurement) as well as accrued additional consideration of approximately £49 million converted at the March 31, 2021 spot rate of $1.38 per GBP. (b) Estimated amounts incurred for bank advisory, legal and accounting fees to facilitate the transaction. (c) The measurement of PPL’s carrying value of the U.K. utility business includes the realization of accumulated other comprehensive losses of $3.7 billion, which arose primarily from currency translation adjustments and defined benefit plans associated with the U.K. utility business. (d) This loss has been recorded as a reduction to goodwill. Summarized Results of Discontinued Operations The operations of the U.K. utility business are included in "Income (Loss) from Discontinued Operations (net of income taxes)" on the Statements of Income. Following are the components of discontinued operations in the Statements of Income for the periods ended March 31: Three Months 2021 2020 Operating Revenues $ 634 $ 614 Operating Expenses 252 222 Other Income (Expense) - net 66 130 Interest Expense (a) 93 93 Income before income taxes 355 429 Loss on sale (1,647) — Income tax expense (b) 751 79 Income (loss) from Discontinued Operations (net of income taxes) $ (2,043) $ 350 (a) No interest from corporate level debt was allocated to discontinued operations. (b) 2021 primarily includes a federal tax expense of $689 million for the recognition of the tax cost associated with the realization of the book-tax outside basis difference in PPL's investment in the U.K. utility business and foreign tax expense of $73 million on current year operations. Summarized Assets and Liabilities Held for Sale The assets and liabilities of PPL's U.K. utility business at March 31, 2021 and December 31, 2020 are included in "Current assets held for sale" and "Current liabilities held for sale" on PPL's Balance Sheets. The following major classes of assets and liabilities were reclassified on PPL's Balance Sheet as of March 31, 2021 and December 31, 2020: Held for Sale at March 31, 2021 Held for Sale at December 31, 2020 Cash and cash equivalents $ 152 $ 266 Accounts receivable and unbilled revenues 459 389 Price risk management assets 62 146 Property, plant and equipment, net (a) 15,236 14,392 Goodwill (b) 1,029 2,558 Other intangibles 434 413 Pension benefit asset 911 682 Other assets 142 137 Total Assets $ 18,425 $ 18,983 Short-term debt and long-term debt due within one year $ 812 $ 994 Accounts payable 199 220 Customer deposits 240 217 Accrued interest 178 190 Long-term debt 8,297 7,938 Total deferred income taxes 1,123 1,032 Price risk management liabilities 180 137 Other deferred credits and liabilities 347 295 Total Liabilities $ 11,376 $ 11,023 Net assets (c) $ 7,049 $ 7,960 (a) Depreciation of fixed assets ceased upon classification as held for sale. (b) The change in Goodwill is due to the loss on sale of $1,647 million and a gain on foreign currency translation of $118 million. (c) The net assets and liabilities held for sale exclude $3.7 billion of accumulated other comprehensive losses related to the U.K. utility business that are required to be included in the carrying value of the loss on sale calculation presented above. Accumulated other comprehensive losses related to the U.K. utility business will be reported as a component of PPL’s equity until the sale of the U.K. utility business occurs. Acquisitions Share Purchase Agreement to Acquire The Narragansett Electric Company On March 17, 2021, PPL and its subsidiary, PPL Energy Holdings, entered into a share purchase agreement (Narragansett SPA) with National Grid USA (National Grid U.S.), a subsidiary of National Grid plc to acquire 100% of the outstanding shares of common stock of The Narragansett Electric Company (Narragansett Electric) for approximately $3.8 billion in cash. On May 3, 2021, an Assignment and Assumption Agreement was entered into by PPL, PPL Energy Holdings, PPL Rhode Island Holdings and National Grid U.S. whereby certain interests of PPL Energy Holdings in the Narragansett SPA were assigned to and assumed by PPL Rhode Island Holdings. Pursuant to that Assignment and Assumption Agreement, PPL Rhode Island Holdings became the purchasing entity under the Narragansett SPA. The acquisition is expected to be funded with proceeds from the sale of the U.K. utility business. PPL has agreed to guarantee all obligations of PPL Energy Holdings and PPL Rhode Island Holdings under the Narragansett SPA and the related Assignment and Assumption Agreement. The closing of the acquisition, which is currently expected to occur by March 2022, is subject to the prior closing of the sale of WPD Investments to National Grid U.K. and is also subject to the receipt of certain U.S. regulatory approvals, including, among others, clearance under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, receipt of the approvals, authorizations or waivers from the Rhode Island Division of Public Utilities and Carriers, the FERC and the Massachusetts Department of Public Utilities, as well as other customary conditions to closing, including the execution and delivery of certain related transaction documents. PPL Energy Holdings and PPL Rhode Island Holdings and National Grid U.S. have each made customary representations, warranties and covenants in the Narragansett SPA, including, among others, customary indemnification provisions and covenants by National Grid U.S. to conduct the Narragansett Electric business in the ordinary course between the execution of the Narragansett SPA and the closing of the acquisition. The consummation of the transaction is not subject to a financing condition. In connection with the acquisition, National Grid U.S. and one or more of its subsidiaries and PPL Energy Holdings and/or one or more of its subsidiaries will enter into a transition services agreement, pursuant to which National Grid U.S. and/or one or more of its affiliates will agree to provide certain transition services to Narragansett Electric and its affiliates to facilitate the operation of Narragansett Electric following the consummation of the acquisition and the transition of operations to PPL, as agreed upon in the Narragansett SPA.

Other Income (Expense) - net

Other Income (Expense) - net	3 Months Ended
	Mar. 31, 2021
Other Income (Expense) Net [Line Items]
Other Income (Expense) - net	13. Other Income (Expense) - net (PPL) The details of "Other Income (Expense) - net" for the periods ended March 31, were: Three Months 2021 2020 Other Income Defined benefit plans - non-service credits (Note 10) $ 4 $ 1 AFUDC - equity component 4 3 Miscellaneous — 1 Total Other Income 8 5 Other Expense Charitable contributions 1 1 Miscellaneous 7 9 Total Other Expense 8 10 Other Income (Expense) - net $ — $ (5)

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Policies)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives, Offsetting Fair Value Amounts, Policy	Net derivative positions on the balance sheets are not offset against the right to reclaim cash collateral (a receivable) or the obligation to return cash collateral (a payable) under master netting arrangements.

Adoption of Accounting Guidance

Adoption of Accounting Guidance (Tables)	3 Months Ended
	Mar. 31, 2021
Summary Of Significant Accounting Policies [Line Items]
Financing Receivable, Allowance for Credit Loss [Table Text Block]	The following table shows changes in the allowance for credit losses for the three months ended March 31, 2021: Balance at Charged to Income Deductions (a) Balance at PPL Accounts Receivable - Customer and Unbilled Revenue $ 44 $ 2 $ 1 $ 45 Other (b) 28 — — 28 PPL Electric Accounts Receivable - Customer and Unbilled Revenue $ 39 $ 1 $ — $ 40 Other 1 — — 1 LKE Accounts Receivable - Customer and Unbilled Revenue $ 5 $ 1 $ 1 $ 5 Other (b) 27 — — 27 LG&E Accounts Receivable - Customer and Unbilled Revenue $ 3 $ — $ — $ 3 KU Accounts Receivable - Customer and Unbilled Revenue $ 2 $ 1 $ 1 $ 2 (a) Primarily related to uncollectible accounts receivable written off. (b) Primarily related to receivables at WKE, which are fully reserved.
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement	The following provides a reconciliation of Cash, Cash Equivalents and Restricted Cash reported within the Balance Sheets that sum to the total of the same amounts shown on the Statements of Cash Flows: PPL March 31, December 31, Cash and cash equivalents $ 421 $ 442 Restricted cash - current (a) 1 1 Total Cash, Cash Equivalents and Restricted Cash $ 422 $ 443 (a) Bank deposits and other cash equivalents that are restricted by agreement or that have been clearly designated for a specific purpose are classified as restricted cash. On the Balance Sheets, the current portion of restricted cash is included in "Other current assets."

Segment and Related Informati_2

Segment and Related Information (Tables)	3 Months Ended
	Mar. 31, 2021
Segment Reporting [Abstract]
Segment and Related Information	Income Statement data for the segments and reconciliation to PPL's consolidated results for the periods ended March 31 are as follows: Three Months 2021 2020 Operating Revenues from external customers Kentucky Regulated $ 885 $ 825 Pennsylvania Regulated 605 608 Corporate and Other 8 7 Total $ 1,498 $ 1,440 Net Income Kentucky Regulated (a) $ 146 $ 127 Pennsylvania Regulated (a) 113 118 Corporate and Other (a) (56) (41) Discontinued Operations (b) (2,043) 350 Total $ (1,840) $ 554 (a) For the period ended March 31, 2020, corporate level financing costs of $8 million, net of $2 million of income taxes, and an immaterial amount were allocated to the Kentucky Regulated and Pennsylvania Regulated segments. Beginning in 2021, corporate level financing costs will no longer be allocated to the reportable segments and are being reported in Corporate and Other. (b) Includes unrealized gains and losses from hedging foreign currency economic activity. See Note 9 for additional information. The following provides Balance Sheet data for the segments and reconciliation to PPL's consolidated Balance Sheets as of: March 31, December 31, Assets Kentucky Regulated $ 15,904 $ 15,943 Pennsylvania Regulated 12,585 12,347 Corporate and Other (a) 867 843 Assets Held for Sale (b) 18,425 18,983 Total $ 47,781 $ 48,116 (a) Primarily consists of unallocated items, including cash, PP&E, goodwill, the elimination of inter-segment transactions as well as the assets of Safari Energy. (b) See Note 9 for additional information.

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2021
Revenue from Contracts with Customers [Line Items]
Reconciliation of Revenue from Contracts with Customers [Table Text Block]	The following tables reconcile "Operating Revenues" included in each Registrant's Statement of Income with revenues generated from contracts with customers for the periods ended March 31. 2021 Three Months PPL PPL Electric LKE LG&E KU Operating Revenues (a) $ 1,498 $ 605 $ 885 $ 428 $ 469 Revenues derived from: Alternative revenue programs (b) 24 22 2 — 2 Other (c) (6) — (6) (3) (3) Revenues from Contracts with Customers $ 1,516 $ 627 $ 881 $ 425 $ 468 2020 Three Months PPL PPL Electric LKE LG&E KU Operating Revenues (a) $ 1,440 $ 608 $ 825 $ 407 $ 432 Revenues derived from: Alternative revenue programs (b) (3) — (3) (3) — Other (c) (8) (2) (6) (3) (3) Revenues from Contracts with Customers $ 1,429 $ 606 $ 816 $ 401 $ 429 (a) PPL Electric and LKE represent revenues from external customers reported by the Pennsylvania Regulated and Kentucky Regulated segments. See Note 3 for additional information. (b) Alternative revenue programs include the transmission formula rate for PPL Electric, the ECR and DSM programs for LG&E and KU, the GLT program for LG&E, and the generation formula rate for KU. For PPL Electric, the three months ended March 31, 2021 includes a $27 million reserve recorded as a result of a challenge to the transmission formula rate return on equity. See Note 7 for further information. This line item shows the over/under collection of these rate mechanisms with over-collections of revenue shown as positive amounts in the table above and under-collections shown as negative amounts. (c) Represents additional revenues outside the scope of revenues from contracts with customers, such as lease and other miscellaneous revenues.
Disaggregation of Revenue [Table Text Block]	The following tables show revenues from contracts with customers disaggregated by customer class for the periods ended March 31. 2021 Three Months PPL PPL Electric LKE LG&E KU Residential $ 774 $ 361 $ 413 $ 205 $ 208 Commercial 313 82 231 121 110 Industrial 152 12 140 46 94 Other (a) 91 12 71 34 37 Wholesale - municipality 6 — 6 — 6 Wholesale - other (b) 20 — 20 19 13 Transmission 160 160 — — — Revenues from Contracts with Customers $ 1,516 $ 627 $ 881 $ 425 $ 468 2020 Three Months PPL PPL Electric LKE LG&E KU Residential $ 714 $ 344 $ 370 $ 187 $ 183 Commercial 312 81 231 124 107 Industrial 144 8 136 45 91 Other (a) 87 14 66 28 38 Wholesale - municipality 5 — 5 — 5 Wholesale - other (b) 8 — 8 17 5 Transmission 159 159 — — — Revenues from Contracts with Customers $ 1,429 $ 606 $ 816 $ 401 $ 429 (a) Primarily includes revenues from pole attachments, street lighting, other public authorities and other non-core businesses. (b) Includes wholesale power and transmission revenues. LG&E and KU amounts include intercompany power sales and transmission revenues, which are eliminated upon consolidation at LKE.
Credit Loss Recognized from Contracts with Customers [Table Text Block]	The following table shows the accounts receivable and unbilled revenues balances that were impaired for the periods ended March 31. Three Months 2021 2020 PPL $ 2 $ 6 PPL Electric 1 4 LKE 1 2 LG&E — 1 KU 1 1
Contract with Customer, Asset and Liability [Table Text Block]	The following table shows the balances and certain activity of contract liabilities resulting from contracts with customers. PPL PPL Electric LKE LG&E KU Contract liabilities at December 31, 2020 $ 40 $ 23 $ 11 $ 5 $ 6 Contract liabilities at March 31, 2021 33 16 10 5 5 Revenue recognized during the three months ended March 31, 2021 that was included in the contract liability balance at December 31, 2020 21 9 11 5 6 Contract liabilities at December 31, 2019 $ 37 $ 21 $ 9 $ 5 $ 4 Contract liabilities at March 31, 2020 34 15 14 10 4 Revenue recognized during the three months ended March 31, 2020 that was included in the contract liability balance at December 31, 2019 19 8 9 5 4

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Basic and Diluted EPS Computations	Reconciliations of the amounts of income and shares of PPL common stock (in thousands) for the periods ended March 31 used in the EPS calculation are: Three Months 2021 2020 Income (Numerator) Income from continuing operations after income taxes available to PPL common shareowners - Basic and Diluted $ 203 $ 204 Income (loss) from discontinued operations (net of income taxes) available to PPL common shareowners - Basic and Diluted $ (2,043) $ 350 Net income (loss) available to PPL common shareowners - Basic and Diluted $ (1,840) $ 554 Shares of Common Stock (Denominator) Weighted-average shares - Basic EPS 769,159 767,948 Add: Dilutive share-based payment awards 1,551 790 Weighted-average shares - Diluted EPS 770,710 768,738 Basic and Diluted EPS Available to PPL common shareowners: Income from continuing operations after income taxes $ 0.26 $ 0.27 Income (loss) from discontinued operations (net of income taxes) (2.65) 0.45 Net Income (Loss) available to PPL common shareowners $ (2.39) $ 0.72
Common Stock Issuances	For the periods ended March 31, PPL issued common stock related to stock-based compensation plans and the DRIP as follows (in thousands): Three Months 2021 2020 Stock-based compensation plans 520 598 DRIP — 434
Antidilutive Securities Excluded From Diluted EPS	For the periods ended March 31, the following shares (in thousands) were excluded from the computations of diluted EPS because the effect would have been antidilutive. Three Months 2021 2020 Stock-based compensation awards 233 250

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2021
Income Taxes [Line Items]
Schedule of Effective Income Tax Rate Reconciliation	Reconciliations of income tax expense (benefit) for the periods ended March 31 are as follows. (PPL) Three Months 2021 2020 Federal income tax on Income from Continuing Operations Before Income Taxes at statutory tax rate - 21% $ 55 $ 56 Increase (decrease) due to: State income taxes, net of federal income tax benefit 12 13 Valuation allowance adjustments 8 6 Depreciation and other items not normalized (2) (2) Amortization of excess deferred federal and state income taxes (12) (11) Other (2) (1) Total increase (decrease) 4 5 Total income tax expense (benefit) $ 59 $ 61
PPL Electric Utilities Corp [Member]
Income Taxes [Line Items]
Schedule of Effective Income Tax Rate Reconciliation	Reconciliations of income tax expense (benefit) for the periods ended March 31 are as follows. (PPL Electric) Three Months 2021 2020 Federal income tax on Income Before Income Taxes at statutory tax rate - 21% $ 32 $ 33 Increase (decrease) due to: State income taxes, net of federal income tax benefit 12 13 Depreciation and other items not normalized (2) (2) Amortization of excess deferred federal and state income taxes (3) (3) Other (2) — Total increase (decrease) 5 8 Total income tax expense (benefit) $ 37 $ 41
LG And E And KU Energy LLC [Member]
Income Taxes [Line Items]
Schedule of Effective Income Tax Rate Reconciliation	Reconciliations of income tax expense (benefit) for the periods ended March 31 are as follows. (LKE) Three Months 2021 2020 Federal income tax on Income Before Income Taxes at statutory tax rate - 21% $ 37 $ 35 Increase (decrease) due to: State income taxes, net of federal income tax benefit 7 7 Valuation allowance adjustments (4) — Amortization of excess deferred federal and state income taxes (7) (7) Other (3) (1) Total increase (decrease) (7) (1) Total income tax expense (benefit) $ 30 $ 34
Louisville Gas And Electric Co [Member]
Income Taxes [Line Items]
Schedule of Effective Income Tax Rate Reconciliation	Reconciliations of income tax expense (benefit) for the periods ended March 31 are as follows. (LG&E) Three Months 2021 2020 Federal income tax on Income Before Income Taxes at statutory tax rate - 21% $ 20 $ 19 Increase (decrease) due to: State income taxes, net of federal income tax benefit 4 4 Amortization of excess deferred federal and state income taxes (3) (3) Other (2) (1) Total increase (decrease) (1) — Total income tax expense (benefit) $ 19 $ 19
Kentucky Utilities Co [Member]
Income Taxes [Line Items]
Schedule of Effective Income Tax Rate Reconciliation	Reconciliations of income tax expense (benefit) for the periods ended March 31 are as follows. (KU) Three Months 2021 2020 Federal income tax on Income Before Income Taxes at statutory tax rate - 21% $ 22 $ 21 Increase (decrease) due to: State income taxes, net of federal income tax benefit 4 4 Amortization of excess deferred federal and state income taxes (4) (4) Other (1) (1) Total increase (decrease) (1) (1) Total income tax expense (benefit) $ 21 $ 20

Utility Rate Regulation (Tables

Utility Rate Regulation (Tables)	3 Months Ended
	Mar. 31, 2021
Utility Rate Regulation [Line Items]
Regulatory Assets and Liabilities	The following table provides information about the regulatory assets and liabilities of cost-based rate-regulated utility operations. PPL PPL Electric March 31, December 31, March 31, December 31, Current Regulatory Assets: Plant outage costs $ 55 $ 46 $ — $ — Gas supply clause 8 4 — — Smart meter rider 21 17 21 17 Transmission formula rate 20 15 20 15 Storm costs 5 7 5 7 Other 12 10 1 1 Total current regulatory assets $ 121 $ 99 $ 47 $ 40 Noncurrent Regulatory Assets: Defined benefit plans $ 556 $ 570 $ 282 $ 290 Storm costs 14 17 — — Unamortized loss on debt 29 30 7 8 Interest rate swaps 18 23 — — Terminated interest rate swaps 74 75 — — Accumulated cost of removal of utility plant 234 240 234 240 AROs 304 300 — — Other 4 7 2 3 Total noncurrent regulatory assets $ 1,233 $ 1,262 $ 525 $ 541 PPL PPL Electric March 31, December 31, March 31, December 31, Current Regulatory Liabilities: Generation supply charge $ 18 $ 21 $ 18 $ 21 Transmission service charge 27 1 27 1 Environmental cost recovery 6 4 — — Universal service rider 16 22 16 22 Fuel adjustment clause 5 5 — — TCJA customer refund 15 11 15 11 Storm damage expense rider 5 6 5 6 Act 129 compliance rider 6 7 6 7 Challenge to transmission formula rate return on equity reserve (a) 27 — 27 — Other 5 2 — — Total current regulatory liabilities $ 130 $ 79 $ 114 $ 68 Noncurrent Regulatory Liabilities: Accumulated cost of removal of utility plant $ 665 $ 653 $ — $ — Power purchase agreement - OVEC 41 43 — — Net deferred taxes 1,673 1,690 552 560 Defined benefit plans 64 60 21 18 Terminated interest rate swaps 65 66 — — Other 18 18 — — Total noncurrent regulatory liabilities $ 2,526 $ 2,530 $ 573 $ 578 LKE LG&E KU March 31, December 31, March 31, December 31, March 31, December 31, Current Regulatory Assets: Plant outage costs $ 55 $ 46 $ 20 $ 12 $ 35 $ 34 Gas supply clause 8 4 8 4 — — Other 11 9 8 7 3 2 Total current regulatory assets $ 74 $ 59 $ 36 $ 23 $ 38 $ 36 Noncurrent Regulatory Assets: Defined benefit plans $ 274 $ 280 $ 170 $ 174 $ 104 $ 106 Storm costs 14 17 9 11 5 6 Unamortized loss on debt 22 22 13 13 9 9 Interest rate swaps 18 23 18 23 — — Terminated interest rate swaps 74 75 43 44 31 31 AROs 304 300 85 85 219 215 Other 2 4 1 1 1 3 Total noncurrent regulatory assets $ 708 $ 721 $ 339 $ 351 $ 369 $ 370 LKE LG&E KU March 31, December 31, March 31, December 31, March 31, December 31, Current Regulatory Liabilities: Environmental cost recovery $ 6 $ 4 $ — $ — $ 6 $ 4 Fuel adjustment clause 5 5 1 — 4 5 Other 5 2 2 — 3 2 Total current regulatory liabilities $ 16 $ 11 $ 3 $ — $ 13 $ 11 Noncurrent Regulatory Liabilities: Accumulated cost of removal $ 665 $ 653 $ 278 $ 274 $ 387 $ 379 Power purchase agreement - OVEC 41 43 28 30 13 13 Net deferred taxes 1,121 1,130 525 528 596 602 Defined benefit plans 43 42 1 — 42 42 Terminated interest rate swaps 65 66 33 33 32 33 Other 18 18 16 17 2 1 Total noncurrent regulatory liabilities $ 1,953 $ 1,952 $ 881 $ 882 $ 1,072 $ 1,070

Financing Activities (Tables)

Financing Activities (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Schedule of Line of Credit Facilities	The following credit facilities were in place at: March 31, 2021 December 31, 2020 Expiration Capacity Borrowed Letters of Unused Borrowed Letters of PPL PPL Capital Funding Syndicated Credit Facility Jan. 2024 $ 1,450 $ — $ 942 $ 508 $ — $ 402 Term Loan Credit Facility Mar. 2022 100 100 — — 100 — Bilateral Credit Facility Mar. 2022 50 — — 50 — — Bilateral Credit Facility Mar. 2022 50 — 15 35 — 15 Term Loan Credit Facility Mar. 2021 — — — — 100 — Term Loan Credit Facility Mar. 2021 — — — — 200 — Total PPL Capital Funding Credit Facilities $ 1,650 $ 100 $ 957 $ 593 $ 400 $ 417 PPL Electric Syndicated Credit Facility Jan. 2024 $ 650 $ — $ 206 $ 444 $ — $ 1 LG&E Syndicated Credit Facility Jan. 2024 $ 500 $ — $ 252 $ 248 $ — $ 262 KU Syndicated Credit Facility Jan. 2024 $ 400 $ — $ 148 $ 252 $ — $ 203
Schedule of Short-term Debt	The following commercial paper programs were in place at: March 31, 2021 December 31, 2020 Weighted - Capacity Commercial Unused Weighted - Commercial PPL Capital Funding 0.22% $ 1,500 $ 942 $ 558 0.25% $ 402 PPL Electric 0.20% 650 205 445 — LG&E (a) 0.22% 425 252 173 0.28% 262 KU 0.21% 350 148 202 0.28% 203 Total $ 2,925 $ 1,547 $ 1,378 $ 867

Defined Benefits (Tables)

Defined Benefits (Tables)	3 Months Ended
	Mar. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule Of Net Periodic Defined Benefit Costs (Credits)	Following are the net periodic defined benefit costs (credits) of the plans sponsored by PPL and its subsidiaries, LKE, and LG&E for the periods ended March 31: Pension Benefits Three Months U.S. U.K. (a) 2021 2020 2021 2020 PPL Service cost $ 13 $ 13 $ 25 $ 23 Interest cost 32 38 29 36 Expected return on plan assets (61) (60) (177) (158) Amortization of: Prior service cost 2 2 — — Actuarial loss 25 20 54 54 Net periodic defined benefit costs (credits) $ 11 $ 13 $ (69) $ (45) (a) U.K. amounts are reflected in discontinued operations. See Note 9 for additional information on the share purchase agreement to sell the U.K. utility business. Other Postretirement Benefits Three Months 2021 2020 PPL Service cost $ 2 $ 2 Interest cost 4 5 Expected return on plan assets (5) (5) Net periodic defined benefit costs $ 1 $ 2 LKE Service cost $ 1 $ 1 Interest cost 2 2 Expected return on plan assets (2) (2) Net periodic defined benefit costs $ 1 $ 1
PPL Electric Utilities Corp [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Allocation of Net Periodic Benefit Costs	For the periods ended March 31, PPL Services allocated the following net periodic defined benefit costs to PPL Electric, and LKE allocated the following net periodic defined benefit costs to LG&E and KU: Three Months 2021 2020 PPL Electric $ — $ 3 LG&E 3 3 KU 1 1
LG And E And KU Energy LLC [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule Of Net Periodic Defined Benefit Costs (Credits)	Following are the net periodic defined benefit costs (credits) of the plans sponsored by PPL and its subsidiaries, LKE, and LG&E for the periods ended March 31: Pension Benefits Three Months 2021 2020 LKE Service cost $ 6 $ 5 Interest cost 14 16 Expected return on plan assets (24) (24) Amortization of: Prior service cost 2 2 Actuarial loss (a) 11 9 Net periodic defined benefit costs (credits) $ 9 $ 8 (a) As a result of treatment approved by the KPSC, the difference between actuarial loss calculated in accordance with LKE's accounting policy and actuarial loss calculated using a 15-year amortization period was $3 million for the three months ended March 31, 2021 and 2020. Other Postretirement Benefits Three Months 2021 2020 PPL Service cost $ 2 $ 2 Interest cost 4 5 Expected return on plan assets (5) (5) Net periodic defined benefit costs $ 1 $ 2 LKE Service cost $ 1 $ 1 Interest cost 2 2 Expected return on plan assets (2) (2) Net periodic defined benefit costs $ 1 $ 1
Louisville Gas And Electric Co [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule Of Net Periodic Defined Benefit Costs (Credits)	Following are the net periodic defined benefit costs (credits) of the plans sponsored by PPL and its subsidiaries, LKE, and LG&E for the periods ended March 31:.
Allocation of Net Periodic Benefit Costs	For the periods ended March 31, PPL Services allocated the following net periodic defined benefit costs to PPL Electric, and LKE allocated the following net periodic defined benefit costs to LG&E and KU: Three Months 2021 2020 PPL Electric $ — $ 3 LG&E 3 3 KU 1 1
Kentucky Utilities Co [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Allocation of Net Periodic Benefit Costs	For the periods ended March 31, PPL Services allocated the following net periodic defined benefit costs to PPL Electric, and LKE allocated the following net periodic defined benefit costs to LG&E and KU: Three Months 2021 2020 PPL Electric $ — $ 3 LG&E 3 3 KU 1 1

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Guarantees	The table below details guarantees provided as of March 31, 2021. Exposure at March 31, 2021 Expiration PPL WPD indemnifications for entities in liquidation and sales of assets $ 11 (a) 2023 WPD guarantee of pension and other obligations of unconsolidated entities 96 (b) LKE Indemnification of lease termination and other divestitures $ 200 (c) 2021 LG&E and KU LG&E and KU obligation of shortfall related to OVEC (d) (a) Indemnification to the liquidators and certain others for existing liabilities or expenses or liabilities arising during the liquidation process. The indemnifications are limited to distributions made from the subsidiary to its parent either prior or subsequent to liquidation or are not explicitly stated in the agreements. The indemnifications generally expire two to seven years subsequent to the date of dissolution of the entities. The exposure noted only includes those cases where the agreements provide for specific limits. In connection with their sales of various businesses, WPD and its affiliates have provided the purchasers with indemnifications that are standard for such transactions, including indemnifications for certain pre-existing liabilities and environmental and tax matters or have agreed to continue their obligations under existing third-party guarantees, either for a set period of time following the transactions or upon the condition that the purchasers make reasonable efforts to terminate the guarantees. Additionally, WPD and its affiliates remain secondarily responsible for lease payments under certain leases that they have assigned to third parties. (b) Relates to certain obligations of discontinued or modified electric associations that were guaranteed at the time of privatization by the participating members. Costs are allocated to the members and can be reallocated if an existing member becomes insolvent. At March 31, 2021, WPD has recorded an estimated discounted liability for which the expected payment/performance is probable. Neither the expiration date nor the maximum amount of potential payments for certain obligations is explicitly stated in the related agreements, and as a result, the exposure has been estimated. (c) LKE provides certain indemnifications covering the due and punctual payment, performance and discharge by each party of its respective obligations. The most comprehensive of these guarantees is the LKE guarantee covering operational, regulatory and environmental commitments and indemnifications made by WKE under a 2009 Transaction Termination Agreement. This guarantee has a term of 12 years ending July 2021, and a maximum exposure of $200 million exclusive of certain items such as government fines and penalties that may exceed the maximum. Additionally, LKE has indemnified various third parties related to historical obligations for other divested subsidiaries and affiliates. The indemnifications vary by entity and the maximum exposures range from being capped at the sale price to no specified maximum. LKE could be required to perform on these indemnifications in the event of covered losses or liabilities being claimed by an indemnified party. LKE cannot predict the ultimate outcomes of the various indemnification scenarios, but does not expect such outcomes to result in significant losses above the amounts recorded. (d) Pursuant to the OVEC power purchase contract, LG&E and KU are obligated to pay for their share of OVEC's excess debt service, post-retirement and decommissioning costs, as well as any shortfall from amounts included within a demand charge designed and expected to cover these costs over the term of the contract. LKE's proportionate share of OVEC's outstanding debt was $103 million at March 31, 2021, consisting of LG&E's share of $71 million and KU's share of $32 million. The maximum exposure and the expiration date of these potential obligations are not presently determinable. See "Energy Purchase Commitments" in Note 11 in PPL's, LKE's, LG&E's and KU's 2020 Form 10-K for additional information on the OVEC power purchase contract.

Related Party Transactions (Tab

Related Party Transactions (Tables)	3 Months Ended
	Mar. 31, 2021
PPL Electric Utilities Corp [Member]
Related Party Transactions [Line Items]
Intercompany Support Cost Allocations	PPL Services, PPL EU Services and LKS charged the following amounts for the periods ended March 31, including amounts applied to accounts that are further distributed between capital and expense on the books of the recipients, based on methods that are believed to be reasonable. Three Months 2021 2020 PPL Electric from PPL Services $ 10 $ 10 LKE from PPL Services 6 6 PPL Electric from PPL EU Services 50 41 LG&E from LKS 42 38 KU from LKS 44 41
LG And E And KU Energy LLC [Member]
Related Party Transactions [Line Items]
Intercompany Support Cost Allocations	PPL Services, PPL EU Services and LKS charged the following amounts for the periods ended March 31, including amounts applied to accounts that are further distributed between capital and expense on the books of the recipients, based on methods that are believed to be reasonable. Three Months 2021 2020 PPL Electric from PPL Services $ 10 $ 10 LKE from PPL Services 6 6 PPL Electric from PPL EU Services 50 41 LG&E from LKS 42 38 KU from LKS 44 41
Louisville Gas And Electric Co [Member]
Related Party Transactions [Line Items]
Intercompany Support Cost Allocations	PPL Services, PPL EU Services and LKS charged the following amounts for the periods ended March 31, including amounts applied to accounts that are further distributed between capital and expense on the books of the recipients, based on methods that are believed to be reasonable. Three Months 2021 2020 PPL Electric from PPL Services $ 10 $ 10 LKE from PPL Services 6 6 PPL Electric from PPL EU Services 50 41 LG&E from LKS 42 38 KU from LKS 44 41
Kentucky Utilities Co [Member]
Related Party Transactions [Line Items]
Intercompany Support Cost Allocations	PPL Services, PPL EU Services and LKS charged the following amounts for the periods ended March 31, including amounts applied to accounts that are further distributed between capital and expense on the books of the recipients, based on methods that are believed to be reasonable. Three Months 2021 2020 PPL Electric from PPL Services $ 10 $ 10 LKE from PPL Services 6 6 PPL Electric from PPL EU Services 50 41 LG&E from LKS 42 38 KU from LKS 44 41

Other Income (Expense) - net (T

Other Income (Expense) - net (Tables)	3 Months Ended
	Mar. 31, 2021
Other Income (Expense) Net [Line Items]
Schedule of Other Nonoperating Income (Expense)	The details of "Other Income (Expense) - net" for the periods ended March 31, were: Three Months 2021 2020 Other Income Defined benefit plans - non-service credits (Note 10) $ 4 $ 1 AFUDC - equity component 4 3 Miscellaneous — 1 Total Other Income 8 5 Other Expense Charitable contributions 1 1 Miscellaneous 7 9 Total Other Expense 8 10 Other Income (Expense) - net $ — $ (5)
PPL Electric Utilities Corp [Member]
Other Income (Expense) Net [Line Items]
Schedule of Other Nonoperating Income (Expense)

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The assets and liabilities measured at fair value were: March 31, 2021 December 31, 2020 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 PPL Assets Cash and cash equivalents $ 421 $ 421 $ — $ — $ 442 $ 442 $ — $ — Restricted cash and cash equivalents (a) 1 1 — — 1 1 — — Special use funds (a): Commingled debt fund measured at NAV (b) 25 — — — 26 — — — Commingled equity fund measured at NAV (b) 24 — — — 25 — — — Total special use funds 49 — — — 51 — — — Total assets $ 471 $ 422 $ — $ — $ 494 $ 443 $ — $ — Liabilities Price risk management liabilities (c): Interest rate swaps $ 17 $ — $ 17 $ — $ 23 $ — $ 23 $ — Total price risk management liabilities $ 17 $ — $ 17 $ — $ 23 $ — $ 23 $ — PPL Electric Assets Cash and cash equivalents $ 29 $ 29 $ — $ — $ 40 $ 40 $ — $ — Total assets $ 29 $ 29 $ — $ — $ 40 $ 40 $ — $ — LKE Assets Cash and cash equivalents $ 16 $ 16 $ — $ — $ 29 $ 29 $ — $ — Total assets $ 16 $ 16 $ — $ — $ 29 $ 29 $ — $ — Liabilities Price risk management liabilities: Interest rate swaps $ 17 $ — $ 17 $ — $ 23 $ — $ 23 $ — Total price risk management liabilities $ 17 $ — $ 17 $ — $ 23 $ — $ 23 $ — LG&E Assets Cash and cash equivalents $ 7 $ 7 $ — $ — $ 7 $ 7 $ — $ — Total assets $ 7 $ 7 $ — $ — $ 7 $ 7 $ — $ — March 31, 2021 December 31, 2020 Total Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Liabilities Price risk management liabilities: Interest rate swaps $ 17 $ — $ 17 $ — $ 23 $ — $ 23 $ — Total price risk management liabilities $ 17 $ — $ 17 $ — $ 23 $ — $ 23 $ — KU Assets Cash and cash equivalents $ 8 $ 8 $ — $ — $ 22 $ 22 $ — $ — Total assets $ 8 $ 8 $ — $ — $ 22 $ 22 $ — $ — (a) Included in "Other current assets" on the Balance Sheets. (b) In accordance with accounting guidance, certain investments that are measured at fair value using net asset value per share (NAV), or its equivalent, have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the Balance Sheets. (c) Current portion is included in "Other current liabilities" and noncurrent portion is included in "Other deferred credits and noncurrent liabilities" on the Balance Sheets.
Fair Value, by Balance Sheet Grouping	The carrying amounts of long-term debt on the Balance Sheets and their estimated fair values are set forth below. March 31, 2021 December 31, 2020 Carrying Fair Value Carrying Fair Value PPL $ 14,691 $ 16,607 $ 14,689 $ 17,774 PPL Electric 4,237 4,881 4,236 5,338 LKE 6,075 7,051 6,074 7,589 LG&E 2,007 2,321 2,007 2,499 KU 2,618 3,042 2,618 3,334 (a) Amounts are net of debt issuance costs.

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2021
Derivative Instruments And Hedging Activities [Line Items]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table presents the fair value and location of derivative instruments recorded on the Balance Sheets. March 31, 2021 December 31, 2020 Derivatives designated as Derivatives not designated Derivatives designated as Derivatives not designated Assets Liabilities Assets Liabilities Assets Liabilities Assets Liabilities Current: Price Risk Management Assets/Liabilities: Interest rate swaps (a) (b) $ — $ 1 $ — $ — $ — $ — $ — $ 2 Cross-currency swaps (c) 2 — — — 94 — — — Foreign currency contracts (c) — — 23 180 — — — 137 Total current 2 1 23 180 94 — — 139 Noncurrent: Price Risk Management Assets/Liabilities: Interest rate swaps (a) (b) — 16 — — — — — 21 Cross-currency swaps (c) 37 — — — 52 — — — Total noncurrent 37 16 — — 52 — — 21 Total derivatives $ 39 $ 17 $ 23 $ 180 $ 146 $ — $ — $ 160 (a) Current portion is included in "Price risk management assets" and "Other current liabilities" and noncurrent portion is included in "Price risk management assets" and "Other deferred credits and noncurrent liabilities" on the Balance Sheets. (b) Excludes accrued interest, if applicable. (c) Included in "Current assets held for sale" and "Current liabilities held for sale" on the Balance Sheets.
Derivative Instruments, Gain (Loss)	The following tables present the pre-tax effect of derivative instruments recognized in income, OCI or regulatory assets and regulatory liabilities for the period ended March 31, 2021. Three Months Three Months Derivative Derivative Gain Location of Gain (Loss) Cash Flow Hedges: Interest rate swaps $ — Interest expense $ (1) Income (Loss) from Discontinued Operations (net of taxes) (1) Cross-currency swaps (46) Income (Loss) from Discontinued Operations (net of taxes) (37) Total $ (46) $ (39) Derivatives Not Designated as Location of Gain (Loss) Recognized in Three Months Foreign currency contracts Income (Loss) from Discontinued Operations (net of taxes) $ (25) Interest rate swaps Interest expense (1) Total $ (26) Derivatives Not Designated as Location of Gain (Loss) Recognized as Three Months Interest rate swaps Regulatory assets - noncurrent $ 6 The following tables present the pre-tax effect of derivative instruments recognized in income, OCI or regulatory assets and regulatory liabilities for the period ended March 31, 2020. Three Months Three Months Derivative Derivative Gain Location of Gain (Loss) Cash Flow Hedges: Interest rate swaps $ (5) Interest expense $ (2) Income (Loss) from Discontinued Operations (net of taxes) (1) Cross-currency swaps 15 Income (Loss) from Discontinued Operations (net of taxes) 6 Total $ 10 $ 3 Derivatives Not Designated as Location of Gain (Loss) Recognized in Three Months Foreign currency contracts Income (Loss) from Discontinued operations (net of taxes) $ 62 Interest rate swaps Interest expense (1) Total $ 61 Derivatives Not Designated as Location of Gain (Loss) Recognized as Three Months Interest rate swaps Regulatory assets - noncurrent $ (8) The following table presents the effect of cash flow hedge activity on the Statement of Income for the period ended March 31, 2021. Location and Amount of Gain (Loss) Recognized in Income on Hedging Relationships Three Months Interest Expense Income (Loss) from Discontinued Operations (net of income taxes) Total income and expense line items presented in the income statement in which the effect of cash flow hedges are recorded $ 153 $ (2,043) The effects of cash flow hedges: Gain (Loss) on cash flow hedging relationships: Interest rate swaps: Amount of gain (loss) reclassified from AOCI to income (1) (1) Cross-currency swaps: Hedged items — 37 Amount of gain (loss) reclassified from AOCI to Income — (37) The following table presents the effect of cash flow hedge activity on the Statement of Income for the period ended March 31, 2020. Location and Amount of Gain (Loss) Recognized in Income on Hedging Relationships Three Months Interest Expense Income (Loss) from Discontinued Operations (net of taxes) Total income and expense line items presented in the income statement in which the effect of cash flow hedges are recorded $ 154 $ 350 The effects of cash flow hedges: Gain (Loss) on cash flow hedging relationships: Interest rate swaps: Amount of gain (loss) reclassified from AOCI to income (2) (1) Cross-currency swaps: Hedged items — (6) Amount of gain (loss) reclassified from AOCI to Income — 6
Derivative Positions Eligible for Offset with Related Cash Collateral	The table below summarizes the derivative positions presented in the balance sheets where a right of setoff exists under these arrangements and related cash collateral received or pledged. Assets Liabilities Eligible for Offset Eligible for Offset Gross Derivative Cash Net Gross Derivative Cash Net March 31, 2021 Treasury Derivatives PPL $ 62 $ 18 $ — $ 44 $ 197 $ 18 $ 22 $ 157 LKE — — — — 17 — — 17 LG&E — — — — 17 — — 17 Assets Liabilities Eligible for Offset Eligible for Offset Gross Derivative Cash Net Gross Derivative Cash Net December 31, 2020 Treasury Derivatives PPL $ 146 $ 34 $ — $ 112 $ 160 $ 34 $ — $ 126 LKE — — — — 23 — — 23 LG&E — — — — 23 — — 23
Credit Risk-Related Contingent Features	At March 31, 2021, derivative contracts in a net liability position that contain credit risk-related contingent features, collateral posted on those positions and the related effect of a decrease in credit ratings below investment grade are summarized as follows: PPL Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features $ 161 Aggregate fair value of collateral posted on these derivative instruments 22 Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade (a) 139 (a) Includes the effect of net receivables and payables already recorded on the Balance Sheet.
LG And E And KU Energy LLC [Member]
Derivative Instruments And Hedging Activities [Line Items]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table presents the fair value and the location on the Balance Sheets of derivatives not designated as hedging instruments. March 31, 2021 December 31, 2020 Assets Liabilities Assets Liabilities Current: Price Risk Management Assets/Liabilities: Interest rate swaps $ — $ 1 $ — $ 2 Total current — 1 — 2 Noncurrent: Price Risk Management Assets/Liabilities: Interest rate swaps — 16 — 21 Total noncurrent — 16 — 21 Total derivatives $ — $ 17 $ — $ 23
Derivative Instruments, Gain (Loss)	The following tables present the pre-tax effect of derivatives not designated as cash flow hedges that are recognized in income or regulatory assets for the period ended March 31, 2021. Location of Gain (Loss) Recognized in Derivative Instruments Income on Derivatives Three Months Interest rate swaps Interest expense $ (1) Location of Gain (Loss) Recognized in Derivative Instruments Regulatory Assets Three Months Interest rate swaps Regulatory assets - noncurrent $ 6 The following tables present the pre-tax effect of derivatives not designated as cash flow hedges that are recognized in income or regulatory assets for the period ended March 31, 2020. Location of Gain (Loss) Recognized in Derivative Instruments Income on Derivatives Three Months Interest rate swaps Interest expense $ (1) Location of Gain (Loss) Recognized in Derivative Instruments Regulatory Assets Three Months Interest rate swaps Regulatory assets - noncurrent $ (8)
Derivative Positions Eligible for Offset with Related Cash Collateral	The table below summarizes the derivative positions presented in the balance sheets where a right of setoff exists under these arrangements and related cash collateral received or pledged. Assets Liabilities Eligible for Offset Eligible for Offset Gross Derivative Cash Net Gross Derivative Cash Net March 31, 2021 Treasury Derivatives PPL $ 62 $ 18 $ — $ 44 $ 197 $ 18 $ 22 $ 157 LKE — — — — 17 — — 17 LG&E — — — — 17 — — 17 Assets Liabilities Eligible for Offset Eligible for Offset Gross Derivative Cash Net Gross Derivative Cash Net December 31, 2020 Treasury Derivatives PPL $ 146 $ 34 $ — $ 112 $ 160 $ 34 $ — $ 126 LKE — — — — 23 — — 23 LG&E — — — — 23 — — 23
Credit Risk-Related Contingent Features	At March 31, 2021, derivative contracts in a net liability position that contain credit risk-related contingent features, collateral posted on those positions and the related effect of a decrease in credit ratings below investment grade are summarized as follows: PPL Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features $ 161 Aggregate fair value of collateral posted on these derivative instruments 22 Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade (a) 139 (a) Includes the effect of net receivables and payables already recorded on the Balance Sheet.
Louisville Gas And Electric Co [Member]
Derivative Instruments And Hedging Activities [Line Items]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The following table presents the fair value and the location on the Balance Sheets of derivatives not designated as hedging instruments. March 31, 2021 December 31, 2020 Assets Liabilities Assets Liabilities Current: Price Risk Management Assets/Liabilities: Interest rate swaps $ — $ 1 $ — $ 2 Total current — 1 — 2 Noncurrent: Price Risk Management Assets/Liabilities: Interest rate swaps — 16 — 21 Total noncurrent — 16 — 21 Total derivatives $ — $ 17 $ — $ 23
Derivative Instruments, Gain (Loss)	The following tables present the pre-tax effect of derivatives not designated as cash flow hedges that are recognized in income or regulatory assets for the period ended March 31, 2021. Location of Gain (Loss) Recognized in Derivative Instruments Income on Derivatives Three Months Interest rate swaps Interest expense $ (1) Location of Gain (Loss) Recognized in Derivative Instruments Regulatory Assets Three Months Interest rate swaps Regulatory assets - noncurrent $ 6 The following tables present the pre-tax effect of derivatives not designated as cash flow hedges that are recognized in income or regulatory assets for the period ended March 31, 2020. Location of Gain (Loss) Recognized in Derivative Instruments Income on Derivatives Three Months Interest rate swaps Interest expense $ (1) Location of Gain (Loss) Recognized in Derivative Instruments Regulatory Assets Three Months Interest rate swaps Regulatory assets - noncurrent $ (8)
Derivative Positions Eligible for Offset with Related Cash Collateral	The table below summarizes the derivative positions presented in the balance sheets where a right of setoff exists under these arrangements and related cash collateral received or pledged. Assets Liabilities Eligible for Offset Eligible for Offset Gross Derivative Cash Net Gross Derivative Cash Net March 31, 2021 Treasury Derivatives PPL $ 62 $ 18 $ — $ 44 $ 197 $ 18 $ 22 $ 157 LKE — — — — 17 — — 17 LG&E — — — — 17 — — 17 Assets Liabilities Eligible for Offset Eligible for Offset Gross Derivative Cash Net Gross Derivative Cash Net December 31, 2020 Treasury Derivatives PPL $ 146 $ 34 $ — $ 112 $ 160 $ 34 $ — $ 126 LKE — — — — 23 — — 23 LG&E — — — — 23 — — 23
Credit Risk-Related Contingent Features	At March 31, 2021, derivative contracts in a net liability position that contain credit risk-related contingent features, collateral posted on those positions and the related effect of a decrease in credit ratings below investment grade are summarized as follows: PPL Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features $ 161 Aggregate fair value of collateral posted on these derivative instruments 22 Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade (a) 139 (a) Includes the effect of net receivables and payables already recorded on the Balance Sheet.

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	3 Months Ended
	Mar. 31, 2021
Asset Retirement Obligation [Line Items]
Asset Retirement Obligation Roll Forward	The changes in the carrying amounts of AROs were as follows. PPL LKE LG&E KU Balance at December 31, 2020 $ 182 $ 182 $ 67 $ 115 Accretion 4 4 1 3 Obligations settled (15) (15) (6) (9) Balance at March 31, 2021 $ 171 $ 171 $ 62 $ 109
LG And E And KU Energy LLC [Member]
Asset Retirement Obligation [Line Items]
Asset Retirement Obligation Roll Forward	The changes in the carrying amounts of AROs were as follows. PPL LKE LG&E KU Balance at December 31, 2020 $ 182 $ 182 $ 67 $ 115 Accretion 4 4 1 3 Obligations settled (15) (15) (6) (9) Balance at March 31, 2021 $ 171 $ 171 $ 62 $ 109
Louisville Gas And Electric Co [Member]
Asset Retirement Obligation [Line Items]
Asset Retirement Obligation Roll Forward	The changes in the carrying amounts of AROs were as follows. PPL LKE LG&E KU Balance at December 31, 2020 $ 182 $ 182 $ 67 $ 115 Accretion 4 4 1 3 Obligations settled (15) (15) (6) (9) Balance at March 31, 2021 $ 171 $ 171 $ 62 $ 109
Kentucky Utilities Co [Member]
Asset Retirement Obligation [Line Items]
Asset Retirement Obligation Roll Forward	The changes in the carrying amounts of AROs were as follows. PPL LKE LG&E KU Balance at December 31, 2020 $ 182 $ 182 $ 67 $ 115 Accretion 4 4 1 3 Obligations settled (15) (15) (6) (9) Balance at March 31, 2021 $ 171 $ 171 $ 62 $ 109

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Schedule of Accumulated Other Comprehensive Income (Loss)	The after-tax changes in AOCI by component for the periods ended March 31 were as follows. Foreign Unrealized gains (losses) Defined benefit plans (b) Prior Actuarial Total PPL December 31, 2020 $ (1,158) $ — $ (16) $ (3,046) $ (4,220) Amounts arising during the period 303 (30) — — 273 Reclassifications from AOCI — 25 — 40 65 Net OCI during the period 303 (5) — 40 338 March 31, 2021 $ (855) $ (5) $ (16) $ (3,006) $ (3,882) December 31, 2019 $ (1,425) $ (5) $ (18) $ (2,910) $ (4,358) Amounts arising during the period (61) 8 — — (53) Reclassifications from AOCI — (3) 1 47 45 Net OCI during the period (61) 5 1 47 (8) March 31, 2020 $ (1,486) $ — $ (17) $ (2,863) $ (4,366) (a) Amounts relate to operations of the U.K. utility business. (b) Substantially all of the amounts relate to pension plans of the U.K. utility business. At March 31, 2021, the combined accumulated other comprehensive loss related to these plans was $2.8 billion.
Reclassification out of Other Comprehensive Income (Loss)	The following table presents PPL's gains (losses) and related income taxes for reclassifications from AOCI for the periods ended March 31. Three Months Affected Line Item on the Details about AOCI 2021 2020 Statements of Income Qualifying derivatives Interest rate swaps $ (1) $ (2) Interest Expense (1) (1) Income (Loss) from Discontinued Operations (net of income taxes) Cross-currency swaps (37) 6 Income (Loss) from Discontinued Operations (net of income taxes) Total Pre-tax (39) 3 Income Taxes 14 — Total After-tax (25) 3 Defined benefit plans Prior service costs (a) — (1) Net actuarial loss (a) (62) (59) Total Pre-tax (62) (60) Income Taxes 22 12 Total After-tax (40) (48) Total reclassifications during the period $ (65) $ (45) (a) These AOCI components are included in the computation of net periodic defined benefit cost. See Note 10 for additional information.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items]
Goodwill	$ 716	$ 716
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items]
Cash and cash equivalents	421	442
Restricted Cash, Current	1	1
Cash, Cash Equivalents and Restricted Cash	422	443	$ 737	$ 660
Accounts Receivable - Customer and Unbilled Revenue [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	45	44
Charged to Income	2
Deductions	1
Other [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	28	28
Charged to Income	0
Deductions	0
PPL Electric Utilities Corp [Member]
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items]
Cash and cash equivalents	29	40
Cash, Cash Equivalents and Restricted Cash	29	40	35	264
PPL Electric Utilities Corp [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	40	39
Charged to Income	1
Deductions	0
PPL Electric Utilities Corp [Member] | Other [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	1	1
Charged to Income	0
Deductions	0
LG And E And KU Energy LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill	996	996
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items]
Cash and cash equivalents	16	29	47	27
LG And E And KU Energy LLC [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	5	5
Charged to Income	1
Deductions	1
LG And E And KU Energy LLC [Member] | Other [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	27	27
Charged to Income	0
Deductions	0
Louisville Gas And Electric Co [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill	389	389
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items]
Cash and cash equivalents	7	7	7	15
Louisville Gas And Electric Co [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	3	3
Charged to Income	0
Deductions	0
Kentucky Utilities Co [Member]
Summary Of Significant Accounting Policies [Line Items]
Goodwill	607	607
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items]
Cash and cash equivalents	8	22	$ 40	$ 12
Kentucky Utilities Co [Member] | Accounts Receivable - Customer and Unbilled Revenue [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Balance	2	$ 2
Charged to Income	1
Deductions	$ 1

Segment and Related Informati_3

Segment and Related Information (Details) $ in Millions		3 Months Ended
		Mar. 31, 2021USD ($)Integer	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)
Income Statement Data [Abstract]
Operating Revenues from external customers		$ 1,498	$ 1,440
Net income (loss)		(1,840)	554
Balance Sheet Data [Abstract]
Assets		47,781		$ 48,116
Segment (Numeric) [Abstract]
Goodwill		716		716
Kentucky Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		885	825
Net income (loss)		146	127
Financing Costs Allocated to Segment, Net of Tax			8
Income Taxes Allocated to Segment			2
Balance Sheet Data [Abstract]
Assets		15,904		15,943
Pennsylvania Regulated [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		605	608
Net income (loss)		113	118
Balance Sheet Data [Abstract]
Assets		12,585		12,347
Corporate and Other [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		8	7
Net income (loss)		(56)	(41)
Balance Sheet Data [Abstract]
Assets		867		843
DiscontinuedOperationsSegment
Income Statement Data [Abstract]
Net income (loss)		(2,043)	350
Balance Sheet Data [Abstract]
Assets		18,425		18,983
PPL Electric Utilities Corp [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		605	608
Net income (loss)	[1]	113	118
Balance Sheet Data [Abstract]
Assets		$ 12,554		12,324
Segment (Numeric) [Abstract]
Number of Reportable Segments | Integer		1
Number of Operating Segments | Integer		2
LG And E And KU Energy LLC [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		$ 885	825
Net income (loss)	[2]	146	135
Balance Sheet Data [Abstract]
Assets		16,238		16,277
Segment (Numeric) [Abstract]
Goodwill		$ 996		996
Number of Reportable Segments | Integer		1
Number of Operating Segments | Integer		1
Louisville Gas And Electric Co [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		$ 428	407
Net income (loss)	[3]	75	73
Balance Sheet Data [Abstract]
Assets		7,328		7,345
Segment (Numeric) [Abstract]
Goodwill		$ 389		389
Number of Reportable Segments | Integer		1
Number of Operating Segments | Integer		1
Kentucky Utilities Co [Member]
Income Statement Data [Abstract]
Operating Revenues from external customers		$ 469	432
Net income (loss)	[4]	86	$ 80
Balance Sheet Data [Abstract]
Assets		9,060		9,072
Segment (Numeric) [Abstract]
Goodwill		$ 607		$ 607
Number of Reportable Segments | Integer		1
Number of Operating Segments | Integer		1
[1]	Net income equals comprehensive income.
[2]	Net income approximates comprehensive income.
[3]	Net income equals comprehensive income.
[4]	Net income equals comprehensive income.

Revenue from Contracts with C_3

Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2022	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	$ 1,498	$ 1,440
Alternative Revenue Programs	24	(3)
Other Revenue	(6)	(8)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	1,516	1,429
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	2	6
Contract with Customer, Liability	33	34		$ 40	$ 37
Contract with Customer, Liability, Revenue Recognized	21	19
Residential [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	774	714
Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	313	312
Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	152	144
Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	91	87
Wholesale - municipal [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	6	5
Wholesale - other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	20	8
Transmission [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	160	159
PPL Electric [Member]
Contract with Customer, Asset and Liability [Abstract]
Revenue Reserve for ROE Challenge	27
Pennsylvania Regulated [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	605	608
Kentucky Regulated [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	885	825
Corporate and Other [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	8	7
Corporate and Other [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-03-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount	47
Corporate and Other [Member] | Forecast [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-03-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Amount			$ 38
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period			12 months
PPL Electric Utilities Corp [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	605	608
Alternative Revenue Programs	22	0
Other Revenue	0	(2)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	627	606
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	1	4
Contract with Customer, Liability	16	15		23	21
Contract with Customer, Liability, Revenue Recognized	9	8
Revenue Reserve for ROE Challenge	27
PPL Electric Utilities Corp [Member] | Residential [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	361	344
PPL Electric Utilities Corp [Member] | Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	82	81
PPL Electric Utilities Corp [Member] | Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	12	8
PPL Electric Utilities Corp [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	12	14
PPL Electric Utilities Corp [Member] | Wholesale - municipal [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	0	0
PPL Electric Utilities Corp [Member] | Wholesale - other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	0	0
PPL Electric Utilities Corp [Member] | Transmission [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	160	159
LG And E And KU Energy LLC [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	885	825
Alternative Revenue Programs	2	(3)
Other Revenue	(6)	(6)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	881	816
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	1	2
Contract with Customer, Liability	10	14		11	9
Contract with Customer, Liability, Revenue Recognized	11	9
LG And E And KU Energy LLC [Member] | Residential [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	413	370
LG And E And KU Energy LLC [Member] | Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	231	231
LG And E And KU Energy LLC [Member] | Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	140	136
LG And E And KU Energy LLC [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	71	66
LG And E And KU Energy LLC [Member] | Wholesale - municipal [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	6	5
LG And E And KU Energy LLC [Member] | Wholesale - other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	20	8
LG And E And KU Energy LLC [Member] | Transmission [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	0	0
Louisville Gas And Electric Co [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	428	407
Alternative Revenue Programs	0	(3)
Other Revenue	(3)	(3)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	425	401
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	0	1
Contract with Customer, Liability	5	10		5	5
Contract with Customer, Liability, Revenue Recognized	5	5
Louisville Gas And Electric Co [Member] | Residential [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	205	187
Louisville Gas And Electric Co [Member] | Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	121	124
Louisville Gas And Electric Co [Member] | Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	46	45
Louisville Gas And Electric Co [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	34	28
Louisville Gas And Electric Co [Member] | Wholesale - municipal [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	0	0
Louisville Gas And Electric Co [Member] | Wholesale - other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	19	17
Louisville Gas And Electric Co [Member] | Transmission [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	0	0
Kentucky Utilities Co [Member]
Reconciliation of Revenue from Contracts with Customers [Abstract]
Operating Revenues	469	432
Alternative Revenue Programs	2	0
Other Revenue	(3)	(3)
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	468	429
Contract with Customer, Asset and Liability [Abstract]
Accounts Receivable, Credit Loss Expense (Reversal)	1	1
Contract with Customer, Liability	5	4		$ 6	$ 4
Contract with Customer, Liability, Revenue Recognized	6	4
Kentucky Utilities Co [Member] | Residential [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	208	183
Kentucky Utilities Co [Member] | Commercial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	110	107
Kentucky Utilities Co [Member] | Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	94	91
Kentucky Utilities Co [Member] | Other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	37	38
Kentucky Utilities Co [Member] | Wholesale - municipal [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	6	5
Kentucky Utilities Co [Member] | Wholesale - other [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	13	5
Kentucky Utilities Co [Member] | Transmission [Member]
Disaggregation of Revenue [Abstract]
Revenues from Contracts with Customers	$ 0	$ 0

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income (Numerator) [Abstract]
Net income (loss)	$ (1,840)	$ 554
Net income (loss) available to PPL common shareowners - Basic	(1,840)	554
Net income (loss) available to PPL common shareowners - Diluted	$ (1,840)	$ 554
Shares of Common Stock (Denominator) [Abstract]
Weighted-average shares - Basic EPS (in shares)	769,159	767,948
Add incremental non-participating securities: [Abstract]
Share-based payment awards (in shares)	1,551	790
Weighted-average shares - Diluted EPS (in shares)	770,710	768,738
Shares Issued (Numeric) [Abstract]
Common stock issued under stock-based compensation plans (in shares)	520	598
Common stock issued under DRIP (in shares)	0	434
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Income from continuing operations after income taxes available to PPL common shareowners - Basic and Diluted	$ 203	$ 204
Income (loss) from discontinued operations (net of income taxes) available to PPL common shareowners - Basic and Diluted	$ (2,043)	$ 350
Income (loss) from Discontinued Operations (net of income taxes)	$ (2.65)	$ 0.45
Income from Continuing Operations after income taxes	$ 0.26	$ 0.27
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the computations of diluted EPS	233	250

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	$ 55	$ 56
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	12	13
Depreciation and other items not normalized	(2)	(2)
Valuation allowance adjustments	8	6
Amortization of excess deferred income taxes	(12)	(11)
Other	(2)	(1)
Total increase (decrease)	4	5
Total income tax expense (benefit)	59	61
PPL Electric Utilities Corp [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	32	33
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	12	13
Depreciation and other items not normalized	(2)	(2)
Amortization of excess deferred income taxes	(3)	(3)
Other	(2)	0
Total increase (decrease)	5	8
Total income tax expense (benefit)	37	41
LG And E And KU Energy LLC [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	37	35
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	7	7
Valuation allowance adjustments	(4)	0
Amortization of excess deferred income taxes	(7)	(7)
Other	(3)	(1)
Total increase (decrease)	(7)	(1)
Total income tax expense (benefit)	30	34
Louisville Gas And Electric Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	20	19
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	4	4
Amortization of excess deferred income taxes	(3)	(3)
Other	(2)	(1)
Total increase (decrease)	(1)	0
Total income tax expense (benefit)	19	19
Kentucky Utilities Co [Member]
Reconciliation of Income Tax Expense [Abstract]
Federal income tax on Income Before Income Taxes at statutory tax rate	22	21
Increase (decrease) due to: [Abstract]
State income taxes, net of federal income tax benefit	4	4
Amortization of excess deferred income taxes	(4)	(4)
Other	(1)	(1)
Total increase (decrease)	(1)	(1)
Total income tax expense (benefit)	$ 21	$ 20

Utility Rate Regulation - Regul

Utility Rate Regulation - Regulatory Assets (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Regulatory Assets [Line Items]
Current regulatory assets	$ 121	$ 99
Noncurrent regulatory assets	1,233	1,262
Plant outage costs [Member]
Regulatory Assets [Line Items]
Current regulatory assets	55	46
Gas supply clause [Member]
Regulatory Assets [Line Items]
Current regulatory assets	8	4
Smart Meter Rider [Member]
Regulatory Assets [Line Items]
Current regulatory assets	21	17
Transmission Formula Rate [Member]
Regulatory Assets [Line Items]
Current regulatory assets	20	15
Defined Benefit Plans [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	556	570
Storm Costs [Member]
Regulatory Assets [Line Items]
Current regulatory assets	5	7
Noncurrent regulatory assets	14	17
Unamortized Loss On Debt [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	29	30
Interest Rate Swaps [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	18	23
Terminated Interest Rate Swaps [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	74	75
Accumulated Cost Of Removal Of Utility Plant [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	234	240
Asset Retirement Obligations [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	304	300
Other Regulatory Assets [Member]
Regulatory Assets [Line Items]
Current regulatory assets	12	10
Noncurrent regulatory assets	4	7
PPL Electric Utilities Corp [Member]
Regulatory Assets [Line Items]
Current regulatory assets	47	40
Noncurrent regulatory assets	525	541
PPL Electric Utilities Corp [Member] | Plant outage costs [Member]
Regulatory Assets [Line Items]
Current regulatory assets	0	0
PPL Electric Utilities Corp [Member] | Gas supply clause [Member]
Regulatory Assets [Line Items]
Current regulatory assets	0	0
PPL Electric Utilities Corp [Member] | Smart Meter Rider [Member]
Regulatory Assets [Line Items]
Current regulatory assets	21	17
PPL Electric Utilities Corp [Member] | Transmission Formula Rate [Member]
Regulatory Assets [Line Items]
Current regulatory assets	20	15
PPL Electric Utilities Corp [Member] | Defined Benefit Plans [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	282	290
PPL Electric Utilities Corp [Member] | Storm Costs [Member]
Regulatory Assets [Line Items]
Current regulatory assets	5	7
Noncurrent regulatory assets	0	0
PPL Electric Utilities Corp [Member] | Unamortized Loss On Debt [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	7	8
PPL Electric Utilities Corp [Member] | Interest Rate Swaps [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	0	0
PPL Electric Utilities Corp [Member] | Terminated Interest Rate Swaps [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	0	0
PPL Electric Utilities Corp [Member] | Accumulated Cost Of Removal Of Utility Plant [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	234	240
PPL Electric Utilities Corp [Member] | Asset Retirement Obligations [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	0	0
PPL Electric Utilities Corp [Member] | Other Regulatory Assets [Member]
Regulatory Assets [Line Items]
Current regulatory assets	1	1
Noncurrent regulatory assets	2	3
LG And E And KU Energy LLC [Member]
Regulatory Assets [Line Items]
Current regulatory assets	74	59
Noncurrent regulatory assets	708	721
LG And E And KU Energy LLC [Member] | Plant outage costs [Member]
Regulatory Assets [Line Items]
Current regulatory assets	55	46
LG And E And KU Energy LLC [Member] | Gas supply clause [Member]
Regulatory Assets [Line Items]
Current regulatory assets	8	4
LG And E And KU Energy LLC [Member] | Defined Benefit Plans [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	274	280
LG And E And KU Energy LLC [Member] | Storm Costs [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	14	17
LG And E And KU Energy LLC [Member] | Unamortized Loss On Debt [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	22	22
LG And E And KU Energy LLC [Member] | Interest Rate Swaps [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	18	23
LG And E And KU Energy LLC [Member] | Terminated Interest Rate Swaps [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	74	75
LG And E And KU Energy LLC [Member] | Asset Retirement Obligations [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	304	300
LG And E And KU Energy LLC [Member] | Other Regulatory Assets [Member]
Regulatory Assets [Line Items]
Current regulatory assets	11	9
Noncurrent regulatory assets	2	4
Louisville Gas And Electric Co [Member]
Regulatory Assets [Line Items]
Current regulatory assets	36	23
Noncurrent regulatory assets	339	351
Louisville Gas And Electric Co [Member] | Plant outage costs [Member]
Regulatory Assets [Line Items]
Current regulatory assets	20	12
Louisville Gas And Electric Co [Member] | Gas supply clause [Member]
Regulatory Assets [Line Items]
Current regulatory assets	8	4
Louisville Gas And Electric Co [Member] | Defined Benefit Plans [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	170	174
Louisville Gas And Electric Co [Member] | Storm Costs [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	9	11
Louisville Gas And Electric Co [Member] | Unamortized Loss On Debt [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	13	13
Louisville Gas And Electric Co [Member] | Interest Rate Swaps [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	18	23
Louisville Gas And Electric Co [Member] | Terminated Interest Rate Swaps [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	43	44
Louisville Gas And Electric Co [Member] | Asset Retirement Obligations [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	85	85
Louisville Gas And Electric Co [Member] | Other Regulatory Assets [Member]
Regulatory Assets [Line Items]
Current regulatory assets	8	7
Noncurrent regulatory assets	1	1
Kentucky Utilities Co [Member]
Regulatory Assets [Line Items]
Current regulatory assets	38	36
Noncurrent regulatory assets	369	370
Kentucky Utilities Co [Member] | Plant outage costs [Member]
Regulatory Assets [Line Items]
Current regulatory assets	35	34
Kentucky Utilities Co [Member] | Gas supply clause [Member]
Regulatory Assets [Line Items]
Current regulatory assets	0	0
Kentucky Utilities Co [Member] | Defined Benefit Plans [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	104	106
Kentucky Utilities Co [Member] | Storm Costs [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	5	6
Kentucky Utilities Co [Member] | Unamortized Loss On Debt [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	9	9
Kentucky Utilities Co [Member] | Interest Rate Swaps [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	0	0
Kentucky Utilities Co [Member] | Terminated Interest Rate Swaps [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	31	31
Kentucky Utilities Co [Member] | Asset Retirement Obligations [Member]
Regulatory Assets [Line Items]
Noncurrent regulatory assets	219	215
Kentucky Utilities Co [Member] | Other Regulatory Assets [Member]
Regulatory Assets [Line Items]
Current regulatory assets	3	2
Noncurrent regulatory assets	$ 1	$ 3

Utility Rate Regulation - Reg_2

Utility Rate Regulation - Regulatory Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	7 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Regulatory Liabilities [Line Items]
Current regulatory liabilities	$ 130	$ 79
Noncurrent regulatory liabilities	$ 2,526	2,530
Utility Rate Regulation	7. Utility Rate Regulation (All Registrants) The following table provides information about the regulatory assets and liabilities of cost-based rate-regulated utility operations. PPL PPL Electric March 31, December 31, March 31, December 31, Current Regulatory Assets: Plant outage costs $ 55 $ 46 $ — $ — Gas supply clause 8 4 — — Smart meter rider 21 17 21 17 Transmission formula rate 20 15 20 15 Storm costs 5 7 5 7 Other 12 10 1 1 Total current regulatory assets $ 121 $ 99 $ 47 $ 40 Noncurrent Regulatory Assets: Defined benefit plans $ 556 $ 570 $ 282 $ 290 Storm costs 14 17 — — Unamortized loss on debt 29 30 7 8 Interest rate swaps 18 23 — — Terminated interest rate swaps 74 75 — — Accumulated cost of removal of utility plant 234 240 234 240 AROs 304 300 — — Other 4 7 2 3 Total noncurrent regulatory assets $ 1,233 $ 1,262 $ 525 $ 541 PPL PPL Electric March 31, December 31, March 31, December 31, Current Regulatory Liabilities: Generation supply charge $ 18 $ 21 $ 18 $ 21 Transmission service charge 27 1 27 1 Environmental cost recovery 6 4 — — Universal service rider 16 22 16 22 Fuel adjustment clause 5 5 — — TCJA customer refund 15 11 15 11 Storm damage expense rider 5 6 5 6 Act 129 compliance rider 6 7 6 7 Challenge to transmission formula rate return on equity reserve (a) 27 — 27 — Other 5 2 — — Total current regulatory liabilities $ 130 $ 79 $ 114 $ 68 Noncurrent Regulatory Liabilities: Accumulated cost of removal of utility plant $ 665 $ 653 $ — $ — Power purchase agreement - OVEC 41 43 — — Net deferred taxes 1,673 1,690 552 560 Defined benefit plans 64 60 21 18 Terminated interest rate swaps 65 66 — — Other 18 18 — — Total noncurrent regulatory liabilities $ 2,526 $ 2,530 $ 573 $ 578 LKE LG&E KU March 31, December 31, March 31, December 31, March 31, December 31, Current Regulatory Assets: Plant outage costs $ 55 $ 46 $ 20 $ 12 $ 35 $ 34 Gas supply clause 8 4 8 4 — — Other 11 9 8 7 3 2 Total current regulatory assets $ 74 $ 59 $ 36 $ 23 $ 38 $ 36 Noncurrent Regulatory Assets: Defined benefit plans $ 274 $ 280 $ 170 $ 174 $ 104 $ 106 Storm costs 14 17 9 11 5 6 Unamortized loss on debt 22 22 13 13 9 9 Interest rate swaps 18 23 18 23 — — Terminated interest rate swaps 74 75 43 44 31 31 AROs 304 300 85 85 219 215 Other 2 4 1 1 1 3 Total noncurrent regulatory assets $ 708 $ 721 $ 339 $ 351 $ 369 $ 370 LKE LG&E KU March 31, December 31, March 31, December 31, March 31, December 31, Current Regulatory Liabilities: Environmental cost recovery $ 6 $ 4 $ — $ — $ 6 $ 4 Fuel adjustment clause 5 5 1 — 4 5 Other 5 2 2 — 3 2 Total current regulatory liabilities $ 16 $ 11 $ 3 $ — $ 13 $ 11 Noncurrent Regulatory Liabilities: Accumulated cost of removal $ 665 $ 653 $ 278 $ 274 $ 387 $ 379 Power purchase agreement - OVEC 41 43 28 30 13 13 Net deferred taxes 1,121 1,130 525 528 596 602 Defined benefit plans 43 42 1 — 42 42 Terminated interest rate swaps 65 66 33 33 32 33 Other 18 18 16 17 2 1 Total noncurrent regulatory liabilities $ 1,953 $ 1,952 $ 881 $ 882 $ 1,072 $ 1,070 (a) See “Regulatory Matters - Federal Matters - Challenge to PPL Electric Transmission Formula Rate Return on Equity” below for further information. Regulatory Matters Kentucky Activities ( PPL, LKE, LG&E and KU ) Rate Case Proceedings On November 25, 2020, LG&E and KU filed requests with the KPSC for an increase in annual electricity and gas revenues of approximately $331 million ($131 million and $170 million in electricity revenues at LG&E and KU and $30 million in gas revenues at LG&E). The revenue increases would be an increase of 11.6% and 10.4% in electricity revenues at LG&E and KU, and an increase of 8.3% in gas revenues at LG&E. In recognition of the economic impact of COVID-19, LG&E and KU requested approval of a one-year billing credit which will credit customers approximately $53 million ($41 million at LG&E and $12 million at KU). The billing credit represents the return to customers of certain regulatory liabilities on LG&E’s and KU’s Balance Sheets and serves to partially mitigate the rate increases during the first year in which the new rates are in effect. LG&E’s and KU’s applications also included a request for a CPCN to deploy Advanced Metering Infrastructure across LG&E’s and KU’s service territories in Kentucky. The applications were based on a forecasted test year of July 1, 2021 through June 30, 2022 and requested an authorized return on equity of 10.0%. On April 19, 2021, LG&E and KU entered into an agreement with all intervening parties to the proceedings resolving all matters in their applications, with the explicit exception of LG&E's and KU's net metering proposals. The agreement proposes increases in annual revenues of $217 million ($77 million and $116 million in electricity revenues at LG&E and KU and $24 million in gas revenues at LG&E) based on an authorized return on equity of 9.55%. The proposal includes an authorized 9.35% return on equity for the ECR and GLT mechanisms. The agreement does not modify the requested one-year billing credit. The agreement proposes that the KPSC should grant LG&E’s and KU’s request for a CPCN to deploy Advanced Metering Infrastructure and proposes the establishment of a Retired Asset Recovery rider (RAR) to provide for recovery of and return on the remaining investment in certain electric generating units upon their retirement over a ten-year period following retirement. In respect of the RAR rider, the agreement proposes that LG&E and KU will continue to use currently approved depreciation rates for Mill Creek units 1 and 2 and Brown Unit 3. The agreement also proposes a four-year “stay-out” commitment from LG&E and KU to refrain from effective base rate increases before July 1, 2025, subject to certain exceptions. A hearing on the agreement, and the underlying proceedings, was completed on April 28, 2021. Subject to KPSC approval, the rates, decreased by the amount of the billing credit, are expected to become effective July 1, 2021. An Order on the net metering issues is expected by the end of September 2021. PPL, LKE, LG&E and KU cannot predict the outcome of these proceedings. Pennsylvania Activities ( PPL and PPL Electric ) Act 129 Act 129 requires Pennsylvania Electric Distribution Companies (EDCs) to meet, by specified dates, specified goals for reduction in customer electricity usage and peak demand. EDCs not meeting the requirements of Act 129 are subject to significant penalties. PPL Electric filed with the PUC its Act 129 Phase IV Energy Efficiency and Conservation Plan (Phase IV Act 129 Plan) on November 30, 2020, for the five-year period starting June 1, 2021 and ending on May 31, 2026. PPL Electric's Phase IV Act 129 Plan was approved by the PUC at its March 25, 2021, public meeting. Federal Matters Challenge to PPL Electric Transmission Formula Rate Return on Equity (PPL and PPL Electric) On May 21, 2020, PP&L Industrial Customer Alliance (PPLICA) filed a complaint with the FERC alleging that PPL Electric's base return on equity (ROE) of 11.18% used to determine PPL Electric's formula transmission rate is unjust and unreasonable, and proposing an alternative ROE of 8.0% based on its interpretation of FERC Opinion No. 569. However, also on May 21, 2020, the FERC issued Opinion No. 569-A in response to numerous requests for rehearing of Opinion No. 569, which revised the method for analyzing base ROE. On June 10, 2020, PPLICA filed a Motion to Supplement the May 21, 2020 complaint in which PPLICA continued to allege that PPL Electric’s base ROE is unjust and unreasonable, but revised its analysis of PPL Electric's base ROE to reflect the guidance provided in Opinion No. 569-A. The amended complaint proposed an updated alternative ROE of 8.5% and also requested that the FERC preserve the original refund effective date as established by the filing of the original complaint on May 21, 2020. Several parties have filed motions to intervene, including one party who filed Comments in Support of the original complaint. On July 10, 2020, PPL Electric filed its Answer and supporting Testimony to the PPLICA filings arguing that the FERC should deny the original and amended complaints as they are without merit and fail to demonstrate the existing base ROE is unjust and unreasonable. In addition, PPL Electric contended any refund effective date should be set for no earlier than June 10, 2020 and PPLICA's proposed replacement ROE should be rejected. On October 15, 2020, the FERC issued an order on the PPLICA complaints which established hearing and settlement procedures, set a refund effective date of May 21, 2020 and granted the motions to intervene. On November 16, 2020, PPL Electric filed a request for rehearing of the portion of the October 15, 2020 Order that set the May 21, 2020 refund effective date. On December 17, 2020, the FERC issued a Notice of Denial of Rehearing by Operation of Law and Providing for Further Consideration. On February 16 and April 19, 2021, PPL Electric filed Petitions for Review with the United States Court of Appeals for the District of Columbia Circuit of the portion of the October 15, 2020 Order that set the May 21, 2020 refund effective date. PPL Electric continues to believe its ROE is just and reasonable and that it has meritorious defenses against the original and amended complaints. Settlement negotiations are currently proceeding, but there can be no assurance that they will result in a final settlement. Although PPL Electric cannot predict the outcome of this matter, in the first quarter of 2021, PPL Electric recorded a revenue reserve of $19 million after-tax. Of this amount, $13 million relates to the period from May 21, 2020 to December 31, 2020. Additional revenue earned from May 21, 2020 through the ultimate resolution of this matter may be subject to refund. A change of 50 basis points to the base ROE would impact PPL Electric's net income by approximately $12 million on an annual basis. FERC Transmission Rate Filing (PPL, LKE, LG&E and KU) In 2018, LG&E and KU applied to the FERC requesting elimination of certain on-going credits to a sub-set of transmission customers relating to the 1998 merger of LG&E's and KU's parent entities and the 2006 withdrawal of LG&E and KU from the Midcontinent Independent System Operator, Inc. (MISO), a regional transmission operator and energy market. The application sought termination of LG&E's and KU's commitment to provide certain Kentucky municipalities mitigation for certain horizontal market power concerns arising out of the 1998 LG&E and KU merger and 2006 MISO withdrawal. The amounts at issue are generally waivers or credits granted to a limited number of Kentucky municipalities for either certain LG&E and KU or MISO transmission charges incurred for transmission service received. Due to the development of robust, accessible energy markets over time, LG&E and KU believe the mitigation commitments are no longer relevant or appropriate. In March 2019, the FERC granted LG&E's and KU's request to remove the ongoing credits, conditioned upon the implementation by LG&E and KU of a transition mechanism for certain existing power supply arrangements, subject to FERC review and approval. In July 2019, LG&E and KU proposed their transition mechanism to the FERC and in September 2019, the FERC rejected the proposed transition mechanism. In September 2020, the FERC issued orders in the rehearing process that modified various aspects of the September 2019 orders which had approved future termination of the credits, including adjusting which customer arrangements are covered by the transition mechanism and respective future periods or dates for termination of credits. In November 2020, the FERC denied the parties' rehearing requests. In November 2020 and January 2021, LG&E and KU and other parties appealed the September 2020 and November 2020 orders at the D.C. Circuit Court of Appeals. The appellate proceedings are continuing, and also include certain additional prior pending petitions for review relating to the matter. On January 15, 2021, LG&E and KU made a filing seeking FERC acceptance of a new proposal for a transition mechanism. On March 16, 2021, the FERC accepted the filed transition mechanism agreements effective on March 17, 2021 but subject to refund, and established hearing and settlement procedures. LG&E and KU are also required to make certain compliance filings consistent with the March 16, 2021 order. LG&E and KU cannot predict the outcome of the respective appellate and FERC proceedings. LG&E and KU currently receive recovery of the waivers and credits provided through other rate mechanisms and such rate recovery would be anticipated to be adjusted consistent with potential changes or terminations of the waivers and credits, as such become effective. Other Purchase of Receivables Program (PPL and PPL Electric)
PPL Electric [Member]
Regulatory Liabilities [Line Items]
Regulatory Liability due to ROE Reserve, After Tax	$ 19	13
Generation Supply Charge [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	18	21
Environmental Cost Recovery [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	6	4
Universal Service Rider [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	16	22
Fuel adjustment clause [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	5	5
TCJA customer refund [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	15	11
Storm Damage Expense Rider [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	5	6
Act 129 Compliance Rider [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	6	7
Accumulated Cost Of Removal Of Utility Plant [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	665	653
Power Purchase Agreement OVEC [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	41	43
Net deferred taxes [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	1,673	1,690
Defined Benefit Plans [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	64	60
Terminated interest rate swaps [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	65	66
Other Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	5	2
Noncurrent regulatory liabilities	18	18
Transmission Service Charge [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	27	1
Change in Regulatory Liability due to ROE Adjustment
Regulatory Liabilities [Line Items]
Current regulatory liabilities	27	0
PPL Electric Utilities Corp [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	114	68
Noncurrent regulatory liabilities	573	578
Regulatory Liability due to ROE Reserve, After Tax	19	13
PPL Electric Utilities Corp [Member] | Generation Supply Charge [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	18	21
PPL Electric Utilities Corp [Member] | Environmental Cost Recovery [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	0	0
PPL Electric Utilities Corp [Member] | Universal Service Rider [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	16	22
PPL Electric Utilities Corp [Member] | Fuel adjustment clause [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	0	0
PPL Electric Utilities Corp [Member] | TCJA customer refund [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	15	11
PPL Electric Utilities Corp [Member] | Storm Damage Expense Rider [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	5	6
PPL Electric Utilities Corp [Member] | Act 129 Compliance Rider [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	6	7
PPL Electric Utilities Corp [Member] | Accumulated Cost Of Removal Of Utility Plant [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	0	0
PPL Electric Utilities Corp [Member] | Power Purchase Agreement OVEC [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	0	0
PPL Electric Utilities Corp [Member] | Net deferred taxes [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	552	560
PPL Electric Utilities Corp [Member] | Defined Benefit Plans [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	21	18
PPL Electric Utilities Corp [Member] | Terminated interest rate swaps [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	0	0
PPL Electric Utilities Corp [Member] | Other Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	0	0
Noncurrent regulatory liabilities	0	0
PPL Electric Utilities Corp [Member] | Transmission Service Charge [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	27	1
PPL Electric Utilities Corp [Member] | Change in Regulatory Liability due to ROE Adjustment
Regulatory Liabilities [Line Items]
Current regulatory liabilities	27	0
LG And E And KU Energy LLC [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	16	11
Noncurrent regulatory liabilities	1,953	1,952
LG And E And KU Energy LLC [Member] | Environmental Cost Recovery [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	6	4
LG And E And KU Energy LLC [Member] | Fuel adjustment clause [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	5	5
LG And E And KU Energy LLC [Member] | Accumulated Cost Of Removal Of Utility Plant [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	665	653
LG And E And KU Energy LLC [Member] | Power Purchase Agreement OVEC [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	41	43
LG And E And KU Energy LLC [Member] | Net deferred taxes [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	1,121	1,130
LG And E And KU Energy LLC [Member] | Defined Benefit Plans [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	43	42
LG And E And KU Energy LLC [Member] | Terminated interest rate swaps [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	65	66
LG And E And KU Energy LLC [Member] | Other Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	5	2
Noncurrent regulatory liabilities	18	18
Louisville Gas And Electric Co [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	3	0
Noncurrent regulatory liabilities	881	882
Louisville Gas And Electric Co [Member] | Environmental Cost Recovery [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	0	0
Louisville Gas And Electric Co [Member] | Fuel adjustment clause [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	1	0
Louisville Gas And Electric Co [Member] | Accumulated Cost Of Removal Of Utility Plant [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	278	274
Louisville Gas And Electric Co [Member] | Power Purchase Agreement OVEC [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	28	30
Louisville Gas And Electric Co [Member] | Net deferred taxes [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	525	528
Louisville Gas And Electric Co [Member] | Defined Benefit Plans [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	1	0
Louisville Gas And Electric Co [Member] | Terminated interest rate swaps [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	33	33
Louisville Gas And Electric Co [Member] | Other Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	2	0
Noncurrent regulatory liabilities	16	17
Kentucky Utilities Co [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	13	11
Noncurrent regulatory liabilities	1,072	1,070
Kentucky Utilities Co [Member] | Environmental Cost Recovery [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	6	4
Kentucky Utilities Co [Member] | Fuel adjustment clause [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	4	5
Kentucky Utilities Co [Member] | Accumulated Cost Of Removal Of Utility Plant [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	387	379
Kentucky Utilities Co [Member] | Power Purchase Agreement OVEC [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	13	13
Kentucky Utilities Co [Member] | Net deferred taxes [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	596	602
Kentucky Utilities Co [Member] | Defined Benefit Plans [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	42	42
Kentucky Utilities Co [Member] | Terminated interest rate swaps [Member]
Regulatory Liabilities [Line Items]
Noncurrent regulatory liabilities	32	33
Kentucky Utilities Co [Member] | Other Regulatory Liabilities [Member]
Regulatory Liabilities [Line Items]
Current regulatory liabilities	3	2
Noncurrent regulatory liabilities	$ 2	$ 1

Utility Rate Regulation - Reg_3

Utility Rate Regulation - Regulatory Matters (Details) - USD ($) $ in Millions	Apr. 19, 2021	Nov. 25, 2020	May 21, 2020	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2022	May 31, 2026
PPL Electric [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage			11.18%
Change in Net Income due to ROE Adjustment				$ 12
Proposed Return Of Equity From Complaint			8.00%
Amended Proposed Return On Equity From Complaint			8.50%
Regulatory Liability due to ROE Reserve, After Tax				19	$ 13
LKE [Member] | Kentucky Public Service Commission [Member] | Electric and Gas Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 331
Public Utilities, Requested Bill Credit		$ 53
LKE [Member] | Kentucky Public Service Commission [Member] | Electric and Gas Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 217
LGE [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Requested Billing Credit Period		1 year
LGE [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
RAR Rider post-retirement recovery period	10 years
Stay Out Commitment Period	4 years
LGE [Member] | Kentucky Public Service Commission [Member] | Forecast [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage						10.00%
LGE [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.55%
LGE [Member] | Kentucky Public Service Commission [Member] | Electric and Gas Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Bill Credit		$ 41
LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 131
Public Utilities, Requested Rate Increase (Decrease), Percentage		11.60%
LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 77
LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 30
Public Utilities, Requested Rate Increase (Decrease), Percentage		8.30%
LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 24
LGE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery and Gas Line Tracker | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.35%
KU [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Requested Billing Credit Period		1 year
KU [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
RAR Rider post-retirement recovery period	10 years
Stay Out Commitment Period	4 years
KU [Member] | Kentucky Public Service Commission [Member] | Forecast [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage						10.00%
KU [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.55%
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 170
Public Utilities, Requested Rate Increase (Decrease), Percentage		10.40%
Public Utilities, Requested Bill Credit		$ 12
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 116
KU [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.35%
PPL Electric Utilities Corp [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage			11.18%
Change in Net Income due to ROE Adjustment				12
Proposed Return Of Equity From Complaint			8.00%
Amended Proposed Return On Equity From Complaint			8.50%
Regulatory Liability due to ROE Reserve, After Tax				$ 19	$ 13
PPL Electric Utilities Corp [Member] | PPL Electric [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Act 129 Recovery Period Under Phase IV Plan							5 years
LG And E And KU Energy LLC [Member] | Kentucky Public Service Commission [Member] | Electric and Gas Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		331
Public Utilities, Requested Bill Credit		$ 53
LG And E And KU Energy LLC [Member] | Kentucky Public Service Commission [Member] | Electric and Gas Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 217
LG And E And KU Energy LLC [Member] | LGE [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Requested Billing Credit Period		1 year
LG And E And KU Energy LLC [Member] | LGE [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
RAR Rider post-retirement recovery period	10 years
Stay Out Commitment Period	4 years
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Forecast [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage						10.00%
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.55%
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Electric and Gas Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Bill Credit		$ 41
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 131
Public Utilities, Requested Rate Increase (Decrease), Percentage		11.60%
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Electric Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 77
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 30
Public Utilities, Requested Rate Increase (Decrease), Percentage		8.30%
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Gas Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 24
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery and Gas Line Tracker | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.35%
LG And E And KU Energy LLC [Member] | KU [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Requested Billing Credit Period		1 year
LG And E And KU Energy LLC [Member] | KU [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
RAR Rider post-retirement recovery period	10 years
Stay Out Commitment Period	4 years
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Forecast [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage						10.00%
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.55%
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 170
Public Utilities, Requested Rate Increase (Decrease), Percentage		10.40%
Public Utilities, Requested Bill Credit		$ 12
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 116
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.35%
Louisville Gas And Electric Co [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Requested Billing Credit Period		1 year
Louisville Gas And Electric Co [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
RAR Rider post-retirement recovery period	10 years
Stay Out Commitment Period	4 years
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Forecast [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage						10.00%
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.55%
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric and Gas Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Bill Credit		$ 41
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 131
Public Utilities, Requested Rate Increase (Decrease), Percentage		11.60%
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 77
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Gas Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 30
Public Utilities, Requested Rate Increase (Decrease), Percentage		8.30%
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Gas Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 24
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery and Gas Line Tracker | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.35%
Kentucky Utilities Co [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Requested Billing Credit Period		1 year
Kentucky Utilities Co [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
RAR Rider post-retirement recovery period	10 years
Stay Out Commitment Period	4 years
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Forecast [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Return on Equity, Percentage						10.00%
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.55%
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Electric Rates
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 170
Public Utilities, Requested Rate Increase (Decrease), Percentage		10.40%
Public Utilities, Requested Bill Credit		$ 12
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Return on Equity, Percentage	9.35%
KU [Member] | Kentucky Public Service Commission [Member] | Electric Rates | Subsequent Event [Member]
Regulatory Matters - Kentucky Activities - Rate Case Proceedings (Numeric) [Abstract]
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 116

Utility Rate Regulation - Other

Utility Rate Regulation - Other (Details) - Unaffiliated Third Party Entity [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
PPL Electric [Member]
Purchases Of Accounts Receivable [Line Items]
Purchases of Accounts Receivable	$ 324	$ 311
PPL Electric Utilities Corp [Member]
Purchases Of Accounts Receivable [Line Items]
Purchases of Accounts Receivable	$ 324	$ 311

Financing Activities - Credit A

Financing Activities - Credit Arrangements (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
PPL Capital Funding [Member]
Line of Credit Facility [Line Items]
Capacity	$ 1,650
Borrowed	100	$ 400
Letters of Credit and Commercial Paper Issued	957	417
Unused Capacity	593
PPL Capital Funding [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	1,450
Borrowed	0	0
Letters of Credit and Commercial Paper Issued	942	402
Unused Capacity	508
PPL Capital Funding [Member] | Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Capacity	100
Borrowed	100	100
Letters of Credit and Commercial Paper Issued	0	0
Unused Capacity	0
PPL Capital Funding [Member] | Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Capacity	0
Borrowed	0	100
Letters of Credit and Commercial Paper Issued	0	0
Unused Capacity	0
PPL Capital Funding [Member] | Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Capacity	0
Borrowed	0	200
Letters of Credit and Commercial Paper Issued	0	0
Unused Capacity	0
PPL Capital Funding [Member] | Bilateral Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	50
Borrowed	0	0
Letters of Credit and Commercial Paper Issued	15	15
Unused Capacity	35
PPL Capital Funding [Member] | Bilateral Credit Facility #2
Line of Credit Facility [Line Items]
Capacity	50
Borrowed	0	0
Letters of Credit and Commercial Paper Issued	0	0
Unused Capacity	50
PPL Electric [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	650
Borrowed	0	0
Letters of Credit and Commercial Paper Issued	206	1
Unused Capacity	444
LGE [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	500
Borrowed	0	0
Letters of Credit and Commercial Paper Issued	252	262
Unused Capacity	248
KU [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	400
Borrowed	0	0
Letters of Credit and Commercial Paper Issued	148	203
Unused Capacity	252
PPL Electric Utilities Corp [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	650
Borrowed	0	0
Letters of Credit and Commercial Paper Issued	206	1
Unused Capacity	444
LG And E And KU Energy LLC [Member] | LGE [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	500
Borrowed	0	0
Letters of Credit and Commercial Paper Issued	252	262
Unused Capacity	248
LG And E And KU Energy LLC [Member] | KU [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	400
Borrowed	0	0
Letters of Credit and Commercial Paper Issued	148	203
Unused Capacity	252
Louisville Gas And Electric Co [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	500
Borrowed	0	0
Letters of Credit and Commercial Paper Issued	252	262
Unused Capacity	248
Kentucky Utilities Co [Member] | Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Capacity	400
Borrowed	0	0
Letters of Credit and Commercial Paper Issued	148	$ 203
Unused Capacity	$ 252

Financing Activities - Short-te

Financing Activities - Short-term Debt (Details) - Commercial Paper [Member] - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Short-term Debt [Line Items]
Capacity	$ 2,925
Commercial Paper Issuances	1,547	$ 867
Unused Capacity	$ 1,378
PPL Capital Funding [Member]
Short-term Debt [Line Items]
Weighted - Average Interest Rate	0.22%	0.25%
Capacity	$ 1,500
Commercial Paper Issuances	942	$ 402
Unused Capacity	$ 558
PPL Electric [Member]
Short-term Debt [Line Items]
Weighted - Average Interest Rate	0.20%
Capacity	$ 650
Commercial Paper Issuances	205	$ 0
Unused Capacity	$ 445
LGE [Member]
Short-term Debt [Line Items]
Weighted - Average Interest Rate	0.22%	0.28%
Capacity	$ 425	$ 350
Commercial Paper Issuances	252	$ 262
Unused Capacity	$ 173
KU [Member]
Short-term Debt [Line Items]
Weighted - Average Interest Rate	0.21%	0.28%
Capacity	$ 350
Commercial Paper Issuances	148	$ 203
Unused Capacity	$ 202
PPL Electric Utilities Corp [Member]
Short-term Debt [Line Items]
Weighted - Average Interest Rate	0.20%
Capacity	$ 650
Commercial Paper Issuances	205	$ 0
Unused Capacity	$ 445
LG And E And KU Energy LLC [Member] | LGE [Member]
Short-term Debt [Line Items]
Weighted - Average Interest Rate	0.22%	0.28%
Capacity	$ 425	$ 350
Commercial Paper Issuances	252	$ 262
Unused Capacity	$ 173
LG And E And KU Energy LLC [Member] | KU [Member]
Short-term Debt [Line Items]
Weighted - Average Interest Rate	0.21%	0.28%
Capacity	$ 350
Commercial Paper Issuances	148	$ 203
Unused Capacity	$ 202
Louisville Gas And Electric Co [Member]
Short-term Debt [Line Items]
Weighted - Average Interest Rate	0.22%	0.28%
Capacity	$ 425	$ 350
Commercial Paper Issuances	252	$ 262
Unused Capacity	$ 173
Kentucky Utilities Co [Member]
Short-term Debt [Line Items]
Weighted - Average Interest Rate	0.21%	0.28%
Capacity	$ 350
Commercial Paper Issuances	148	$ 203
Unused Capacity	$ 202

Financing Activities - Long-ter

Financing Activities - Long-term Debt (Details) - USD ($) $ in Millions	May 31, 2021	Apr. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
PPL Capital Funding [Member]
Long-term Debt (Numeric) [Abstract]
Capacity			$ 1,650
Borrowed			100	$ 400
PPL Capital Funding [Member] | Term Loan Facility [Member]
Long-term Debt (Numeric) [Abstract]
Capacity			100
Borrowed			$ 100	$ 100
PPL Capital Funding [Member] | Term Loan Facility [Member] | Repayment | Subsequent Event [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount		$ 100
LGE [Member] | Trimble County Pollution Control Revenue Bonds, 2001 Series B | Remarketed [Member] | Subsequent Event [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 35
Stated interest rate	1.35%
LGE [Member] | Jefferson County Pollution Control Revenue Bonds, 2001 Series B | Remarketed [Member] | Subsequent Event [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 35
Stated interest rate	1.35%
LGE [Member] | Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2003 Series A | Remarketed [Member] | Subsequent Event [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount		$ 128
Stated interest rate		2.00%
LG And E And KU Energy LLC [Member] | LGE [Member] | Trimble County Pollution Control Revenue Bonds, 2001 Series B | Remarketed [Member] | Subsequent Event [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 35
Stated interest rate	1.35%
LG And E And KU Energy LLC [Member] | LGE [Member] | Jefferson County Pollution Control Revenue Bonds, 2001 Series B | Remarketed [Member] | Subsequent Event [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 35
Stated interest rate	1.35%
LG And E And KU Energy LLC [Member] | LGE [Member] | Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2003 Series A | Remarketed [Member] | Subsequent Event [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount		$ 128
Stated interest rate		2.00%
Louisville Gas And Electric Co [Member] | Trimble County Pollution Control Revenue Bonds, 2001 Series B | Remarketed [Member] | Subsequent Event [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 35
Stated interest rate	1.35%
Louisville Gas And Electric Co [Member] | Jefferson County Pollution Control Revenue Bonds, 2001 Series B | Remarketed [Member] | Subsequent Event [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 35
Stated interest rate	1.35%
Louisville Gas And Electric Co [Member] | Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2003 Series A | Remarketed [Member] | Subsequent Event [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount		$ 128
Stated interest rate		2.00%

Financing Activities - Equity S

Financing Activities - Equity Securities (Details) - USD ($) $ in Billions	3 Months Ended
	Mar. 31, 2021	Feb. 28, 2018
Other Liabilities Disclosure [Abstract]
Common Stock Aggregate Sales Price		$ 1
Maximum Percentage Paid To Selling Agents	2.00%
Common stock issued	0

Financing Activities - Distribu

Financing Activities - Distributions (Details) - $ / shares	1 Months Ended	3 Months Ended
	Feb. 28, 2021	Mar. 31, 2021	Mar. 31, 2020
Distributions (Numeric) [Abstract]
Current quarterly common stock dividend (in dollars per share)	$ 0.415	$ 0.415	$ 0.415
Annualized current quarterly common stock dividend (in dollars per share)	$ 1.66

Acquisitions, Development and_3

Acquisitions, Development and Divestitures - Discontinued Operations (Details) £ in Thousands, $ in Millions	Jul. 31, 2021USD ($)Rate	Jul. 31, 2021GBP (£)	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)	Jul. 31, 2021GBP (£)Rate	Dec. 31, 2020USD ($)
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Income (Loss) from Discontinued Operations (net of income taxes)			$ (2,043)	$ 350
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Total Assets			18,425			$ 18,983
Total Liabilities			11,376			11,023
Discontinued Operations, Held-for-sale | WPD
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]
Loss on Sale			(1,647)	0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Sale of Disposal Group, Net of Tax			3,700
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Operating Revenues			634	614
Operating Expenses			252	222
Other Income (Expense) - net			66	130
Interest Expense			93	93
Income before income taxes			355	429
Loss on Sale			(1,647)	0
Income tax expense			751	79
Income (Loss) from Discontinued Operations (net of income taxes)			(2,043)	350
Disposal Group, Including Discontinued Operation, Income Tax Expense Attributable to Realization of Book-Tax Outside Basis, Domestic			689
Disposal Group, Including Discontinued Operation, Income Tax Expense Attributable to Realization of Book-Tax Outside Basis, Foreign			73
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Cash and cash equivalents			152			266
Accounts receivable and unbilled revenues			459			389
Price risk management assets			62			146
Property, plant and equipment, net			15,236			14,392
Goodwill			1,029			2,558
Other intangibles			434			413
Pension benefit asset			911			682
Other assets			142			137
Total Assets			18,425			18,983
Short-term debt and long-term debt due within one year			812			994
Accounts payable			199			220
Customer deposits			240			217
Accrued interest			178			190
Long-term debt			8,297			7,938
Total deferred income taxes			1,123			1,032
Price risk management liabilities			180			137
Other deferred credits and liabilities			347			295
Total Liabilities			11,376			11,023
Net assets			7,049			$ 7,960
Loss on Sale			(1,647)	$ 0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax			118
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Sale of Disposal Group, Net of Tax			$ 3,700
Discontinued Operations, Held-for-sale | WPD | Forecast [Member]
Discontinued Operation, Income (Loss) from Discontinued Operation Disclosures [Abstract]
Sales proceeds	$ 10,806	£ 7,800,000
Proceeds from Daily Dividend, Divestiture of Business | £					£ 548
Loss on Sale	(1,647)
Costs to sell	48
Carrying value	12,405
Additional Proceeds From Divestiture Of Business Not Included In Selling Price | £		£ 49,000
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Sale of Disposal Group, Net of Tax	$ 3,700
Foreign Currency Exchange Rate, Translation | Rate	138.00%				138.00%
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Loss on Sale	$ (1,647)
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Loss on Sale	(1,647)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Sale of Disposal Group, Net of Tax	$ 3,700

Acquisitions, Development and_4

Acquisitions, Development and Divestitures - Development (Details) $ in Millions	Mar. 31, 2022USD ($)
Forecast [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 3,800

Defined Benefits (Details)

Defined Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Pension Plan [Member] | U.S.
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 13	$ 13
Interest cost	32	38
Expected return on plan assets	(61)	(60)
Amortization of: [Abstract]
Prior service cost	2	2
Actuarial loss	25	20
Net periodic defined benefit costs (credits)	11	13
Pension Plan [Member] | U.K.
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	25	23
Interest cost	29	36
Expected return on plan assets	(177)	(158)
Amortization of: [Abstract]
Prior service cost	0	0
Actuarial loss	54	54
Net periodic defined benefit costs (credits)	(69)	(45)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	2	2
Interest cost	4	5
Expected return on plan assets	(5)	(5)
Amortization of: [Abstract]
Net periodic defined benefit costs (credits)	1	2
PPL Electric Utilities Corp [Member] | PPL Services [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Costs allocated to subsidiary by plan sponsors	0	3
LG And E And KU Energy LLC [Member] | Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	6	5
Interest cost	14	16
Expected return on plan assets	(24)	(24)
Amortization of: [Abstract]
Prior service cost	2	2
Actuarial loss	11	9
Net periodic defined benefit costs (credits)	$ 9	$ 8
Regulatory Asset Amortization Period	15 years	15 years
Deferred recovery of the difference between pension costs calculated with pension accounting policy and pension cost using 15 year amortization period	$ 3
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	$ 1
Interest cost	2	2
Expected return on plan assets	(2)	(2)
Amortization of: [Abstract]
Net periodic defined benefit costs (credits)	1	1
Louisville Gas And Electric Co [Member] | LKE [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Costs allocated to subsidiary by plan sponsors	3	3
Kentucky Utilities Co [Member] | LKE [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Costs allocated to subsidiary by plan sponsors	$ 1	$ 1

Commitments and Contingencies -

Commitments and Contingencies - Legal Matters and Regulatory Issues (Details) $ in Millions	1 Months Ended
	Jun. 30, 2017mi	Jul. 31, 2014claim	Dec. 31, 2013resident	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)	Jun. 01, 2015
Claim By Former Affiliate [Abstract]
Percent of ownership of Talen Energy by Riverstone						35.00%
PPL Electric [Member] | PPL Electric Additional Sites [Member]
Claim By Former Affiliate [Abstract]
Accrual for Environmental Loss Contingencies | $				$ 10	$ 10
LGE [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
Number of residents that filed class action suit | resident			6
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim		1
LGE [Member] | Minimum [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
Number of miles within plant that would include a class of residents	1
LGE [Member] | Maximum [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
Number of miles within plant that would include a class of residents	3
PPL Electric Utilities Corp [Member] | PPL Electric Additional Sites [Member]
Claim By Former Affiliate [Abstract]
Accrual for Environmental Loss Contingencies | $				$ 10	$ 10
LG And E And KU Energy LLC [Member] | LGE [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
Number of residents that filed class action suit | resident			6
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim		1
LG And E And KU Energy LLC [Member] | LGE [Member] | Minimum [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
Number of miles within plant that would include a class of residents	1
LG And E And KU Energy LLC [Member] | LGE [Member] | Maximum [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
Number of miles within plant that would include a class of residents	3
Louisville Gas And Electric Co [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
Number of residents that filed class action suit | resident			6
Number of remaining unresolved Clean Air Act violation claims after July 2014 court ruling | claim		1
Louisville Gas And Electric Co [Member] | Minimum [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
Number of miles within plant that would include a class of residents	1
Louisville Gas And Electric Co [Member] | Maximum [Member]
Legal Matters - Cane Run Environmental Claims (Numeric) [Abstract]
Number of miles within plant that would include a class of residents	3

Commitments and Contingencies_2

Commitments and Contingencies - Environmental Matters and Other (Details) - PPL Electric Additional Sites [Member] - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
PPL Electric [Member]
Environmental Matters - Superfund and Other Remediation (Numeric) [Abstract]
Accrual for Environmental Loss Contingencies	$ 10	$ 10
PPL Electric Utilities Corp [Member]
Environmental Matters - Superfund and Other Remediation (Numeric) [Abstract]
Accrual for Environmental Loss Contingencies	$ 10	$ 10

Commitments and Contingencies_3

Commitments and Contingencies - Guarantees and Other Assurances (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)Integer	Dec. 31, 2020USD ($)
Guarantor Obligations [Line Items]
Recorded liability for all guarantees	$ 4	$ 5
Other Guarantee (Numeric) [Abstract]
Maximum aggregate coverage bodily injury and property damage	225
PPL Guarantee [Member] | Indemnification Guarantee [Member] | WPD Indemnifications For Entities In Liquidation and Sales Of Assets [Member]
Guarantor Obligations [Line Items]
Maximum exposure	$ 11
PPL Guarantee [Member] | Indemnification Guarantee [Member] | Indemnifications For Entities In Liquidation Sales Of Assets
Guarantor Obligations [Line Items]
Minimum Period In Years That Indemnifications Generally Expire | Integer	2
Maximum Period In Years That Indemnifications Generally Expire | Integer	7
PPL Guarantee [Member] | Financial Guarantee [Member] | WPD Guarantee Of Pension And Other Obligations Of Unconsolidated Entities [Member]
Guarantor Obligations [Line Items]
Maximum exposure	$ 96
LKE Guarantee [Member] | Indemnification Guarantee [Member] | Indemnification Of Lease Termination And Other Divestitures [Member]
Guarantor Obligations [Line Items]
Maximum exposure	$ 200
Term of guarantee (in years)	12
Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues	$ 200
LKE Guarantee [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member]
Guarantor Obligations [Line Items]
Maximum exposure is not estimable	The maximum exposure and the expiration date of these potential obligations are not presently determinable.
Contingent proportionate share of OVEC's outstanding debt	$ 103
LG And E And KU Energy LLC [Member] | Indemnification Guarantee [Member] | Indemnification Of Lease Termination And Other Divestitures [Member]
Guarantor Obligations [Line Items]
Maximum exposure	$ 200
Term of guarantee (in years)	12
Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues	$ 200
LG And E And KU Energy LLC [Member] | LGE And KU Guarantee [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member]
Guarantor Obligations [Line Items]
Maximum exposure is not estimable	The maximum exposure and the expiration date of these potential obligations are not presently determinable
Contingent proportionate share of OVEC's outstanding debt	$ 103
Louisville Gas And Electric Co [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member]
Guarantor Obligations [Line Items]
Maximum exposure is not estimable	The maximum exposure and the expiration date of these potential obligations are not presently determinable
Contingent proportionate share of OVEC's outstanding debt	$ 71
Kentucky Utilities Co [Member] | Financial Guarantee [Member] | LGE And KU Guarantee Of Shortfall Related To OVEC [Member]
Guarantor Obligations [Line Items]
Maximum exposure is not estimable	The maximum exposure and the expiration date of these potential obligations are not presently determinable
Contingent proportionate share of OVEC's outstanding debt	$ 32

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
PPL Electric Utilities Corp [Member] | PPL Services [Member]
Support Costs (Details) [Abstract]
Related Party Transaction, Amounts of Transaction	$ 10	$ 10
Intercompany Borrowings (Numeric) [Abstract]
VEBA Funds Receivable	20		$ 22
PPL Electric Utilities Corp [Member] | PPL EU Services [Member]
Support Costs (Details) [Abstract]
Related Party Transaction, Amounts of Transaction	50	41
PPL Electric Utilities Corp [Member] | PPL Energy Funding [Member]
Intercompany Borrowings (Numeric) [Abstract]
Intercompany note with affiliate maximum borrowing capacity	650
Notes receivable from affiliate	0		0
PPL Electric Utilities Corp [Member] | Accounts receivable from affiliates [Member] | PPL Services [Member]
Intercompany Borrowings (Numeric) [Abstract]
VEBA Funds Receivable	10		10
PPL Electric Utilities Corp [Member] | Other Noncurrent Assets [Member] | PPL Services [Member]
Intercompany Borrowings (Numeric) [Abstract]
VEBA Funds Receivable	10		12
LG And E And KU Energy LLC [Member]
Intercompany Borrowings (Numeric) [Abstract]
Long-term debt to affiliate	1,200		1,200
Interest Expense with Affiliate	13	7
Notes payable with affiliates	227		251
LG And E And KU Energy LLC [Member] | PPL Services [Member]
Support Costs (Details) [Abstract]
Related Party Transaction, Amounts of Transaction	6	6
LG And E And KU Energy LLC [Member] | PPL Energy Funding [Member]
Intercompany Borrowings (Numeric) [Abstract]
Intercompany note with affiliate maximum borrowing capacity	375
Notes payable with affiliates	$ 227		$ 251
Related Party Transaction, Rate	162.00%		1.65%
LG And E And KU Energy LLC [Member] | PPL Affiliate [Member]
Intercompany Borrowings (Numeric) [Abstract]
Intercompany note with affiliate maximum borrowing capacity	$ 300
Notes receivable from affiliate	$ 0		$ 0
LG And E And KU Energy LLC [Member] | Note Payable [Member] | Affiliated Entity [Member]
Intercompany Borrowings (Numeric) [Abstract]
Debt instrument term (in years)	10 years
Long-term debt to affiliate	$ 1,200
Interest Expense with Affiliate	$ 12	7
Related Party Transaction, Rate	389.00%		389.00%
LG And E And KU Energy LLC [Member] | Note Payable [Member] | Affiliated Entity [Member]
Intercompany Borrowings (Numeric) [Abstract]
Debt instrument term (in years)	10 years
Louisville Gas And Electric Co [Member] | Parent And Affiliate [Member]
Intercompany Borrowings (Numeric) [Abstract]
Intercompany Money Pool Agreement Maximum Borrowing Capacity	$ 325
Notes payable with affiliates	0		$ 0
Louisville Gas And Electric Co [Member] | LKS [Member]
Support Costs (Details) [Abstract]
Related Party Transaction, Amounts of Transaction	42	38
Kentucky Utilities Co [Member] | Parent And Affiliate [Member]
Intercompany Borrowings (Numeric) [Abstract]
Intercompany Money Pool Agreement Maximum Borrowing Capacity	300
Notes payable with affiliates	0		$ 0
Kentucky Utilities Co [Member] | LKS [Member]
Support Costs (Details) [Abstract]
Related Party Transaction, Amounts of Transaction	$ 44	$ 41

Other Income (Expense) - net (D

Other Income (Expense) - net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Income
Defined benefit plans - non-service credits	$ 4	$ 1
AFUDC - equity component	4	3
Miscellaneous	0	1
Total Other Income	8	5
Other Expense
Charitable Contributions	1	1
Miscellaneous	7	9
Total Other Expense	8	10
Other Income (Expense) - net	0	(5)
PPL Electric Utilities Corp [Member]
Other Expense
Other Income (Expense) - net	$ 5	$ 3

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis Table (Details) - Recurring Fair Value Measurements [Member] - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 421	$ 442
Restricted cash and cash equivalents	1	1
Special Use Funds [Abstract]
Commingled debt fund measured at NAV	25	26
Commingled equity fund measured at NAV	24	25
Total special use funds	49	51
Price risk management assets:
Total Assets	471	494
Price risk management liabilities:
Interest rate swaps	17	23
Total price risk management liabilities	17	23
Level 1 [Member]
Assets
Cash and cash equivalents	421	442
Restricted cash and cash equivalents	1	1
Special Use Funds [Abstract]
Total special use funds	0	0
Price risk management assets:
Total Assets	422	443
Price risk management liabilities:
Interest rate swaps	0	0
Total price risk management liabilities	0	0
Level 2 [Member]
Assets
Cash and cash equivalents	0	0
Restricted cash and cash equivalents	0	0
Special Use Funds [Abstract]
Total special use funds	0	0
Price risk management assets:
Total Assets	0	0
Price risk management liabilities:
Interest rate swaps	17	23
Total price risk management liabilities	17	23
Level 3 [Member]
Assets
Cash and cash equivalents	0	0
Restricted cash and cash equivalents	0	0
Special Use Funds [Abstract]
Total special use funds	0	0
Price risk management assets:
Total Assets	0	0
Price risk management liabilities:
Interest rate swaps	0	0
Total price risk management liabilities	0	0
PPL Electric Utilities Corp [Member]
Assets
Cash and cash equivalents	29	40
Price risk management assets:
Total Assets	29	40
PPL Electric Utilities Corp [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	29	40
Price risk management assets:
Total Assets	29	40
PPL Electric Utilities Corp [Member] | Level 2 [Member]
Assets
Cash and cash equivalents	0	0
Price risk management assets:
Total Assets	0	0
PPL Electric Utilities Corp [Member] | Level 3 [Member]
Assets
Cash and cash equivalents	0	0
Price risk management assets:
Total Assets	0	0
LG And E And KU Energy LLC [Member]
Assets
Cash and cash equivalents	16	29
Price risk management assets:
Total Assets	16	29
Price risk management liabilities:
Interest rate swaps	17	23
Total price risk management liabilities	17	23
LG And E And KU Energy LLC [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	16	29
Price risk management assets:
Total Assets	16	29
Price risk management liabilities:
Interest rate swaps	0	0
Total price risk management liabilities	0	0
LG And E And KU Energy LLC [Member] | Level 2 [Member]
Assets
Cash and cash equivalents	0	0
Price risk management assets:
Total Assets	0	0
Price risk management liabilities:
Interest rate swaps	17	23
Total price risk management liabilities	17	23
LG And E And KU Energy LLC [Member] | Level 3 [Member]
Assets
Cash and cash equivalents	0	0
Price risk management assets:
Total Assets	0	0
Price risk management liabilities:
Interest rate swaps	0	0
Total price risk management liabilities	0	0
Louisville Gas And Electric Co [Member]
Assets
Cash and cash equivalents	7	7
Price risk management assets:
Total Assets	7	7
Price risk management liabilities:
Interest rate swaps	17	23
Total price risk management liabilities	17	23
Louisville Gas And Electric Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	7	7
Price risk management assets:
Total Assets	7	7
Price risk management liabilities:
Interest rate swaps	0	0
Total price risk management liabilities	0	0
Louisville Gas And Electric Co [Member] | Level 2 [Member]
Assets
Cash and cash equivalents	0	0
Price risk management assets:
Total Assets	0	0
Price risk management liabilities:
Interest rate swaps	17	23
Total price risk management liabilities	17	23
Louisville Gas And Electric Co [Member] | Level 3 [Member]
Assets
Cash and cash equivalents	0	0
Price risk management assets:
Total Assets	0	0
Price risk management liabilities:
Interest rate swaps	0	0
Total price risk management liabilities	0	0
Kentucky Utilities Co [Member]
Assets
Cash and cash equivalents	8	22
Price risk management assets:
Total Assets	8	22
Kentucky Utilities Co [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	8	22
Price risk management assets:
Total Assets	8	22
Kentucky Utilities Co [Member] | Level 2 [Member]
Assets
Cash and cash equivalents	0	0
Price risk management assets:
Total Assets	0	0
Kentucky Utilities Co [Member] | Level 3 [Member]
Assets
Cash and cash equivalents	0	0
Price risk management assets:
Total Assets	$ 0	$ 0

Fair Value Measurements - Finan

Fair Value Measurements - Financial Instruments Not Recorded at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Carrying Amount [Member]
Fair Value of Financial Instruments Not Recorded at Fair Value - Other
Debt Instrument, Fair Value Disclosure	$ 14,691	$ 14,689
Fair Value [Member]
Fair Value of Financial Instruments Not Recorded at Fair Value - Other
Debt Instrument, Fair Value Disclosure	16,607	17,774
PPL Electric Utilities Corp [Member] | Carrying Amount [Member]
Fair Value of Financial Instruments Not Recorded at Fair Value - Other
Debt Instrument, Fair Value Disclosure	4,237	4,236
PPL Electric Utilities Corp [Member] | Fair Value [Member]
Fair Value of Financial Instruments Not Recorded at Fair Value - Other
Debt Instrument, Fair Value Disclosure	4,881	5,338
LG And E And KU Energy LLC [Member] | Carrying Amount [Member]
Fair Value of Financial Instruments Not Recorded at Fair Value - Other
Debt Instrument, Fair Value Disclosure	6,075	6,074
LG And E And KU Energy LLC [Member] | Fair Value [Member]
Fair Value of Financial Instruments Not Recorded at Fair Value - Other
Debt Instrument, Fair Value Disclosure	7,051	7,589
Louisville Gas And Electric Co [Member] | Carrying Amount [Member]
Fair Value of Financial Instruments Not Recorded at Fair Value - Other
Debt Instrument, Fair Value Disclosure	2,007	2,007
Louisville Gas And Electric Co [Member] | Fair Value [Member]
Fair Value of Financial Instruments Not Recorded at Fair Value - Other
Debt Instrument, Fair Value Disclosure	2,321	2,499
Kentucky Utilities Co [Member] | Carrying Amount [Member]
Fair Value of Financial Instruments Not Recorded at Fair Value - Other
Debt Instrument, Fair Value Disclosure	2,618	2,618
Kentucky Utilities Co [Member] | Fair Value [Member]
Fair Value of Financial Instruments Not Recorded at Fair Value - Other
Debt Instrument, Fair Value Disclosure	$ 3,042	$ 3,334

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Intro (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Master Netting Arrangements (Numeric) [Line Items]
Cash colleteral posted under master netting arrangements	$ 22	$ 0
LG And E And KU Energy LLC [Member]
Master Netting Arrangements (Numeric) [Line Items]
Cash collateral obligation under master netting arrangements	0	0
Cash colleteral posted under master netting arrangements	0	0
Louisville Gas And Electric Co [Member]
Master Netting Arrangements (Numeric) [Line Items]
Cash collateral obligation under master netting arrangements	0	0
Cash colleteral posted under master netting arrangements	0	0
Kentucky Utilities Co [Member]
Master Netting Arrangements (Numeric) [Line Items]
Cash collateral obligation under master netting arrangements	0	0
Cash colleteral posted under master netting arrangements	$ 0	$ 0

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Risk Disclosures (Details) £ in Millions, $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)	Mar. 31, 2021GBP (£)
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]
Gain (Loss) on Discontinuation of Interest Rate Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net	$ 0	$ 0
Cash Flow Hedges [Member] | Cross Currency Swaps [Member]
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]
Derivative, Notional Amount	202
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Derivative Notional Amount Matured	500
Principal amount	500
Net Investment Hedges [Member] | Foreign Currency Contracts [Member]
Foreign Currency Risk - Net Investment Hedges (Numeric) [Abstract]
Net after tax gains (losses) on net investment hedges recognized in the foreign currency translation adjustment component of AOCI	33		$ 33
Economic Hedges [Member] | Foreign Currency Contracts [Member]
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Total exposure hedged related to foreign currency contracts for anticipated earnings hedges classified as economic activity | £				£ 7,500
LGE [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member]
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]
Derivative, Notional Amount	64
LG And E And KU Energy LLC [Member] | LGE [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member]
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]
Derivative, Notional Amount	64
Louisville Gas And Electric Co [Member] | Economic Hedges [Member] | Interest Rate Swaps [Member]
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]
Derivative, Notional Amount	$ 64

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Fair Values (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Designated As Hedging Instruments [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	$ 39	$ 146
Liability value	17	0
Designated As Hedging Instruments [Member] | Current Assets [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	2	94
Designated As Hedging Instruments [Member] | Other current liabilities [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	1	0
Designated As Hedging Instruments [Member] | Current assets held for sale [Member] | Cross Currency Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	2	94
Designated As Hedging Instruments [Member] | Current assets held for sale [Member] | Foreign Currency Contracts [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
Designated As Hedging Instruments [Member] | Noncurrent Assets [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	37	52
Designated As Hedging Instruments [Member] | Price risk management assets, noncurrent [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
Designated As Hedging Instruments [Member] | Other deferred credits and noncurrent liabilities [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	16	0
Designated As Hedging Instruments [Member] | Current liabilities held for sale [Member] | Cross Currency Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	0	0
Designated As Hedging Instruments [Member] | Current liabilities held for sale [Member] | Foreign Currency Contracts [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	0	0
Designated As Hedging Instruments [Member] | Current Liabilities [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	1	0
Designated As Hedging Instruments [Member] | Price risk management assets, current [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	16	0
Designated As Hedging Instruments [Member] | Current assets held for sale via noncurrent assets [Member] | Cross Currency Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	37	52
Designated As Hedging Instruments [Member] | Current liabilities held for sale via noncurrent liabilities [Member] | Cross Currency Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	0	0
Not Designated As Hedging Instruments [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	23	0
Liability value	180	160
Not Designated As Hedging Instruments [Member] | Current Assets [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	23	0
Not Designated As Hedging Instruments [Member] | Other current liabilities [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	0	2
Not Designated As Hedging Instruments [Member] | Current assets held for sale [Member] | Cross Currency Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
Not Designated As Hedging Instruments [Member] | Current assets held for sale [Member] | Foreign Currency Contracts [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	23	0
Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
Not Designated As Hedging Instruments [Member] | Price risk management assets, noncurrent [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
Not Designated As Hedging Instruments [Member] | Other deferred credits and noncurrent liabilities [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	0	21
Not Designated As Hedging Instruments [Member] | Current liabilities held for sale [Member] | Cross Currency Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	0	0
Not Designated As Hedging Instruments [Member] | Current liabilities held for sale [Member] | Foreign Currency Contracts [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	180	137
Not Designated As Hedging Instruments [Member] | Current Liabilities [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	180	139
Not Designated As Hedging Instruments [Member] | Price risk management assets, current [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	0	21
Not Designated As Hedging Instruments [Member] | Current assets held for sale via noncurrent assets [Member] | Cross Currency Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
Not Designated As Hedging Instruments [Member] | Current liabilities held for sale via noncurrent liabilities [Member] | Cross Currency Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	0	0
LG And E And KU Energy LLC [Member] | Not Designated As Hedging Instruments [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
Liability value	17	23
LG And E And KU Energy LLC [Member] | Not Designated As Hedging Instruments [Member] | Current Assets [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
LG And E And KU Energy LLC [Member] | Not Designated As Hedging Instruments [Member] | Current Assets [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
LG And E And KU Energy LLC [Member] | Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
LG And E And KU Energy LLC [Member] | Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
LG And E And KU Energy LLC [Member] | Not Designated As Hedging Instruments [Member] | Current Liabilities [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	1	2
LG And E And KU Energy LLC [Member] | Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	1	2
LG And E And KU Energy LLC [Member] | Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	16	21
LG And E And KU Energy LLC [Member] | Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	16	21
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
Liability value	17	23
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Current Assets [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Current Assets [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Asset value	0	0
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Current Liabilities [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	1	2
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Current Liabilities [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	1	2
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	16	21
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Noncurrent Liabilities [Member] | Interest Rate Swaps [Member]
Fair Values by Balance Sheet Location [Abstract]
Liability value	$ 16	$ 21

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities - Gains and Losses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense	$ 153	$ 154
Other Income (Expense) - net	0	(5)
Cash Flow Hedges [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (Loss) Reclassified from AOCI into Income	(39)	3
Cash Flow Hedges [Member] | Other Comprehensive Income (Loss) [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Derivative Gain (Loss) Recognized in OCI	(46)	10
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Other Comprehensive Income (Loss) [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Derivative Gain (Loss) Recognized in OCI	0	(5)
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Interest Expense [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (Loss) Reclassified from AOCI into Income	(1)	(2)
Amount of gain (loss) reclassified from AOCI to income	(1)	(2)
Cash Flow Hedges [Member] | Interest Rate Swaps [Member] | Income (Loss) from Discontinued Operations (net of income taxes)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (Loss) Reclassified from AOCI into Income	(1)	(1)
Amount of gain (loss) reclassified from AOCI to income	(1)	(1)
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Other Comprehensive Income (Loss) [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Derivative Gain (Loss) Recognized in OCI	(46)	15
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Interest Expense [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Amount of gain (loss) reclassified from AOCI to income		0
Hedged items	0	0
Cash Flow Hedges [Member] | Cross Currency Swaps [Member] | Income (Loss) from Discontinued Operations (net of income taxes)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (Loss) Reclassified from AOCI into Income	(37)	6
Amount of gain (loss) reclassified from AOCI to income	(37)	6
Hedged items	37	(6)
Not Designated As Hedging Instruments [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	(26)	61
Asset value	23		$ 0
Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0		0
Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Regulatory Assets Noncurrent [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized as regulatory liabilities/assets	6	(8)
Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Interest Expense [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	(1)	(1)
Not Designated As Hedging Instruments [Member] | Foreign Currency Contracts [Member] | Income (Loss) from Discontinued Operations (net of income taxes)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	(25)	62
Designated As Hedging Instruments [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	39		146
Designated As Hedging Instruments [Member] | Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	37		52
LG And E And KU Energy LLC [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense	51	58
LG And E And KU Energy LLC [Member] | Not Designated As Hedging Instruments [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0		0
LG And E And KU Energy LLC [Member] | Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0		0
LG And E And KU Energy LLC [Member] | Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0		0
LG And E And KU Energy LLC [Member] | Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Regulatory Assets Noncurrent [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized as regulatory liabilities/assets	6	(8)
LG And E And KU Energy LLC [Member] | Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Interest Expense [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	(1)	(1)
Louisville Gas And Electric Co [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense	21	22
Other Income (Expense) - net	(2)	(1)
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0		0
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0		0
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0		$ 0
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Regulatory Assets Noncurrent [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized as regulatory liabilities/assets	6	(8)
Louisville Gas And Electric Co [Member] | Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member] | Interest Expense [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	(1)	(1)
Kentucky Utilities Co [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense	27	28
Other Income (Expense) - net	$ 1	$ 1

Derivative Instruments and He_8

Derivative Instruments and Hedging Activities - Offsetting Derivative Instruments and Credit Risk-Related Features (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Liabilities [Abstract]
Cash collateral pledged - eligible for offset	$ 22	$ 0
Credit Risk-Related Contingent Features [Abstract]
Aggregate fair value of derivative instruments in a net liability position with credit risk-related contingent features	161
Aggregate fair value of collateral posted on these derivative instruments	22
Aggregate fair value of additional collateral requirements in the event of a credit downgrade below investment grade	139
Treasury Derivatives [Member]
Assets [Abstract]
Gross	62	146
Derivative instruments - eligible for offset	18	34
Cash collateral received - eligible for offset	0	0
Net	44	112
Liabilities [Abstract]
Gross	197	160
Derivative instruments - eligible for offset	18	34
Cash collateral pledged - eligible for offset	22	0
Net	157	126
LG And E And KU Energy LLC [Member]
Assets [Abstract]
Cash collateral received - eligible for offset	0	0
Liabilities [Abstract]
Cash collateral pledged - eligible for offset	0	0
LG And E And KU Energy LLC [Member] | Treasury Derivatives [Member]
Assets [Abstract]
Gross	0	0
Derivative instruments - eligible for offset	0	0
Cash collateral received - eligible for offset	0	0
Net	0	0
Liabilities [Abstract]
Gross	17	23
Derivative instruments - eligible for offset	0	0
Cash collateral pledged - eligible for offset	0	0
Net	17	23
Louisville Gas And Electric Co [Member]
Assets [Abstract]
Cash collateral received - eligible for offset	0	0
Liabilities [Abstract]
Cash collateral pledged - eligible for offset	0	0
Louisville Gas And Electric Co [Member] | Treasury Derivatives [Member]
Assets [Abstract]
Gross	0	0
Derivative instruments - eligible for offset	0	0
Cash collateral received - eligible for offset	0	0
Net	0	0
Liabilities [Abstract]
Gross	17	23
Derivative instruments - eligible for offset	0	0
Cash collateral pledged - eligible for offset	0	0
Net	$ 17	$ 23

Asset Retirement Obligations (D

Asset Retirement Obligations (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021USD ($)
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	$ 182
Accretion	4
Obligations settled	(15)
Balance at End of Period	171
LG And E And KU Energy LLC [Member]
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	182
Accretion	4
Obligations settled	(15)
Balance at End of Period	171
Louisville Gas And Electric Co [Member]
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	67
Accretion	1
Obligations settled	(6)
Balance at End of Period	62
Kentucky Utilities Co [Member]
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	115
Accretion	3
Obligations settled	(9)
Balance at End of Period	$ 109

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - After-tax Changes by Component (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ (4,220)	$ (4,358)
Amounts arising during the period	273	(53)
Reclassifications from AOCI	65	45
Net OCI during the period	338	(8)
Balance at end of period	(3,882)	(4,366)
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(1,158)	(1,425)
Amounts arising during the period	303	(61)
Reclassifications from AOCI	0	0
Net OCI during the period	303	(61)
Balance at end of period	(855)	(1,486)
Unrealized gains (losses) on qualifying derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	0	(5)
Amounts arising during the period	(30)	8
Reclassifications from AOCI	25	(3)
Net OCI during the period	(5)	5
Balance at end of period	(5)	0
Defined benefit plans Prior service costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(16)	(18)
Amounts arising during the period	0	0
Reclassifications from AOCI	0	1
Net OCI during the period	0	1
Balance at end of period	(16)	(17)
Defined benefit plans Actuarial gain (loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(3,046)	(2,910)
Amounts arising during the period	0	0
Reclassifications from AOCI	40	47
Net OCI during the period	40	47
Balance at end of period	(3,006)	(2,863)
Accumulated Defined Benefit Plans Net | WPD
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at end of period	2,800
LG And E And KU Energy LLC [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net OCI during the period	$ 3	$ 1

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) - Income (Expense) Effect of Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Affected Line Item on the Statements of Income [Line Items]
Interest Expense	$ (153)	$ (154)
Other Income (Expense) - net	0	(5)
Income Taxes	(59)	(61)
Income (Loss) from Discontinued Operations (net of income taxes)	(2,043)	350
Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total After-tax	(65)	(45)
Qualifying Derivatives [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total Pre-tax	(39)	3
Income Taxes	14	0
Total After-tax	(25)	3
Qualifying Derivatives [Member] | Interest Rate Swaps [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Interest Expense	(1)	(2)
Income (Loss) from Discontinued Operations (net of income taxes)	(1)	(1)
Qualifying Derivatives [Member] | Cross Currency Swaps [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Income (Loss) from Discontinued Operations (net of income taxes)	(37)	6
Defined Benefit Plans [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total Pre-tax	(62)	(60)
Income Taxes	22	12
Total After-tax	(40)	(48)
Defined Benefit Plans [Member] | Prior Service Costs [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total Pre-tax	0	(1)
Defined Benefit Plans [Member] | Net Actuarial Loss [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total Pre-tax	$ (62)	$ (59)