CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities
Net income		$ 1,469	$ 1,746	$ 1,827
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		1,287	1,199	1,094
Amortization		72	81	78
Defined benefit plans - expense (income)		(201)	(263)	(192)
Deferred income taxes and investment tax credits		402	309	355
Unrealized (gains) losses on derivatives, and other hedging activities		280	73	(186)
Stock compensation expense		29	36	26
Other		(12)	(22)	(3)
Change in current assets and current liabilities
Accounts receivable		(82)	4	28
Accounts payable		10	(77)	78
Unbilled Revenues		10	(5)	41
Fuel, materials and supplies		(17)	(26)	17
Regulatory assets and liabilities, net		(63)	(88)	13
Other current liabilities		(23)	(73)	(22)
Other		(1)	(33)	(2)
Other operating activities
Defined benefit plans - funding		(390)	(350)	(361)
Proceeds from transfer of excess benefit plan funds		0	0	65
Other assets		(59)	(100)	(75)
Other liabilities		35	16	40
Net cash provided by operating activities		2,746	2,427	2,821
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(3,249)	(3,083)	(3,238)
Purchases of investments		0	55	65
Proceeds from the sale of investments		9	69	6
Other investing activities		(18)	(11)	(64)
Net cash provided by (used in) investing activities		(3,258)	(3,080)	(3,361)
Cash Flows from Financing Activities
Issuance of long-term debt		2,167	1,465	1,059
Retirement of long-term debt		(1,172)	(300)	(277)
Proceeds from project financing		173	0	0
Issuance of common stock		34	1,167	698
Payment of common stock dividends		(1,275)	(1,192)	(1,133)
Issuance of term loan		300	0	0
Issuance of commercial paper		73	0	0
Net increase (decrease) in short-term debt		127	(278)	363
Other financing activities		(41)	(26)	(20)
Net cash provided by (used in) financing activities		386	836	690
Effect of Exchange Rates on Cash, Cash Equivalents and Restricted Cash		17	10	(18)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		(109)	193	132
Cash and Cash Equivalents at Beginning of Period		815
Cash and Cash Equivalents at End of Period		708	815
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		836	643	511
Cash, Cash Equivalents and Restricted Cash at End of Period		727	836	643
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		939	905	910
Income taxes - net		95	93	127
Accrued expenditures for property, plant and equipment at December 31,		319	340	345
Accrued expenditures for intangible assets at December 31,		85	79	64
PPL Electric Utilities Corp [Member]
Cash Flows from Operating Activities
Net income	[1]	497	457	430
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		403	386	352
Amortization		26	24	22
Deferred income taxes and investment tax credits		83	90	125
Other		(6)	(19)	(1)
Change in current assets and current liabilities
Accounts receivable		(47)	33	47
Accounts payable		21	5	10
Unbilled Revenues		13	(14)	7
Fuel, materials and supplies		(18)	(8)	9
Regulatory assets and liabilities, net		(40)	(43)	(19)
Other		(9)	(3)	6
Other operating activities
Defined benefit plans - funding		(21)	(21)	(28)
Other assets		(28)	15	(37)
Other liabilities		10	11	55
Net cash provided by operating activities		884	913	978
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(1,145)	(1,114)	(1,192)
Expenditures for intangible assets		(9)	(7)	(4)
Other investing activities		3	4	3
Net cash provided by (used in) investing activities		(1,151)	(1,117)	(1,193)
Cash Flows from Financing Activities
Issuance of long-term debt		250	393	398
Retirement of long-term debt		0	(100)	0
Contributions from parent		940	400	429
Payment of common stock dividends to parent		(400)	(486)	(390)
Return of Capital to Parent		(745)	0	0
Other financing activities		(2)	(8)	(4)
Net cash provided by (used in) financing activities		43	199	433
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		(224)	(5)	218
Cash and Cash Equivalents at Beginning of Period		262
Cash and Cash Equivalents at End of Period		40	262
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		264	269	51
Cash, Cash Equivalents and Restricted Cash at End of Period		40	264	269
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		158	154	144
Income taxes - net		67	32	(20)
Accrued expenditures for property, plant and equipment at December 31,		156	180	158
LG And E And KU Energy LLC [Member]
Cash Flows from Operating Activities
Net income		450	468	445
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		606	547	475
Amortization		19	27	18
Defined benefit plans - expense (income)		15	11	17
Deferred income taxes and investment tax credits		64	82	94
Other		(2)	(3)	(4)
Change in current assets and current liabilities
Accounts receivable		(17)	(16)	1
Accounts payable		(11)	(26)	39
Unbilled Revenues		(12)	5	34
Accounts payable to affiliates		5	2	2
Fuel, materials and supplies		10	0	7
Taxes payable		13	(5)	(3)
Regulatory assets and liabilities, net		(26)	(45)	32
Other		(13)	(8)	(24)
Other operating activities
Defined benefit plans - funding		(54)	(34)	(131)
Other assets		(5)	(3)	(24)
Expenditures for asset retirement obligations		(84)	(89)	(72)
Other liabilities		45	25	9
Net cash provided by operating activities		1,003	938	915
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(966)	(1,094)	(1,117)
Other investing activities		3	0	1
Net cash provided by (used in) investing activities		(963)	(1,094)	(1,116)
Cash Flows from Financing Activities
Issuance of long-term debt		498	705	118
Issuance of long-term note with affiliate		550	0	250
Retirement of long-term debt		(975)	(200)	(27)
Acquisition of outstanding bonds		0	(40)	0
Remarketing of reacquired bonds		0	40	0
Issuance of commercial paper		73	0	0
Contributions from member		0	63	0
Distributions to member		(283)	(308)	(302)
Net increase (decrease) in notes payable to affiliates		101	37	(112)
Net increase (decrease) in short-term debt		4	(126)	270
Other financing activities		(6)	(12)	(2)
Net cash provided by (used in) financing activities		(38)	159	195
Net Increase (Decrease) in Cash and Cash Equivalents		2	3	(6)
Cash and Cash Equivalents at Beginning of Period		27	24	30
Cash and Cash Equivalents at End of Period		29	27	24
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		248	237	218
Income taxes - net		38	29	46
Accrued expenditures for property, plant and equipment at December 31,		100	113	150
Louisville Gas And Electric Co [Member]
Cash Flows from Operating Activities
Net income	[2]	244	232	233
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		259	231	195
Amortization		9	15	14
Defined benefit plans - expense (income)		3	3	3
Deferred income taxes and investment tax credits		3	56	60
Change in current assets and current liabilities
Accounts receivable		(3)	(9)	4
Accounts receivable from affiliates		4	6	0
Accounts payable		(18)	(10)	10
Unbilled Revenues		(3)	1	14
Accounts payable to affiliates		(5)	5	1
Fuel, materials and supplies		4	5	4
Taxes payable		(1)	7	1
Regulatory assets and liabilities, net		0	(19)	5
Other		(3)	(5)	(10)
Other operating activities
Defined benefit plans - funding		(11)	(6)	(61)
Other assets		(2)	(1)	(12)
Expenditures for asset retirement obligations		(20)	(30)	(22)
Other liabilities		23	11	4
Net cash provided by operating activities		483	492	443
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(456)	(482)	(554)
Net cash provided by (used in) investing activities		(456)	(482)	(554)
Cash Flows from Financing Activities
Issuance of long-term debt		0	399	100
Retirement of long-term debt		0	(200)	0
Acquisition of outstanding bonds		0	(40)	0
Remarketing of reacquired bonds		0	40	0
Issuance of commercial paper		41	0	0
Contributions from parent		103	25	83
Payment of common stock dividends to parent		(161)	(182)	(156)
Net increase (decrease) in short-term debt		(17)	(41)	80
Other financing activities		(1)	(6)	(1)
Net cash provided by (used in) financing activities		(35)	(5)	106
Net Increase (Decrease) in Cash and Cash Equivalents		(8)	5	(5)
Cash and Cash Equivalents at Beginning of Period		15	10	15
Cash and Cash Equivalents at End of Period		7	15	10
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		82	77	71
Income taxes - net		63	2	7
Accrued expenditures for property, plant and equipment at December 31,		60	59	61
Kentucky Utilities Co [Member]
Cash Flows from Operating Activities
Net income	[3]	280	293	286
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		346	315	279
Amortization		8	10	3
Defined benefit plans - expense (income)		0	(1)	0
Deferred income taxes and investment tax credits		20	39	48
Other		(1)	(3)	(4)
Change in current assets and current liabilities
Accounts receivable		(13)	(3)	(4)
Accounts receivable from affiliates		(1)	0	0
Accounts payable		9	(15)	29
Unbilled Revenues		(9)	4	20
Accounts payable to affiliates		(16)	(2)	(3)
Fuel, materials and supplies		6	(6)	3
Taxes payable		2	2	5
Regulatory assets and liabilities, net		(26)	(26)	27
Other		(5)	(6)	(3)
Other operating activities
Defined benefit plans - funding		(3)	(3)	(54)
Other assets		(2)	(2)	(12)
Expenditures for asset retirement obligations		(64)	(59)	(50)
Other liabilities		12	16	11
Net cash provided by operating activities		543	553	581
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(510)	(610)	(562)
Other investing activities		3	0	1
Net cash provided by (used in) investing activities		(507)	(610)	(561)
Cash Flows from Financing Activities
Issuance of long-term debt		498	306	18
Retirement of long-term debt		(500)	0	(27)
Issuance of commercial paper		32	0	0
Contributions from parent		128	68	45
Payment of common stock dividends to parent		(200)	(229)	(246)
Net increase (decrease) in short-term debt		21	(85)	190
Other financing activities		(5)	(5)	(1)
Net cash provided by (used in) financing activities		(26)	55	(21)
Net Increase (Decrease) in Cash and Cash Equivalents		10	(2)	(1)
Cash and Cash Equivalents at Beginning of Period		12	14	15
Cash and Cash Equivalents at End of Period		22	12	14
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		109	101	95
Income taxes - net		44	39	25
Accrued expenditures for property, plant and equipment at December 31,		$ 40	$ 54	$ 88

[1] Net income equals comprehensive income.

[2] Net income equals comprehensive income.

[3] Net income equals comprehensive income.