CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities
Net income		$ 1,746	$ 1,827	$ 1,128
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		1,199	1,094	1,008
Amortization		81	78	97
Defined benefit plans - expense (income)		(263)	(192)	(95)
Deferred income taxes and investment tax credits		309	355	707
Unrealized (gains) losses on derivatives, and other hedging activities		73	(186)	178
Stock compensation expense		36	26	38
Other		(22)	(3)	(9)
Change in current assets and current liabilities
Accounts receivable		4	28	(33)
Accounts payable		(77)	78	(10)
Unbilled Revenues		(5)	41	(48)
Fuel, materials and supplies		(26)	17	40
Regulatory assets and liabilities, net		(88)	13	(12)
Other current liabilities		(73)	(22)	6
Other		(33)	(2)	11
Other operating activities
Defined benefit plans - funding		(350)	(361)	(565)
Proceeds from transfer of excess benefit plan funds		0	65	0
Other assets		(100)	(75)	32
Other liabilities		16	40	(12)
Net cash provided by operating activities		2,427	2,821	2,461
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(3,083)	(3,238)	(3,133)
Purchases of investments		55	65	0
Proceeds from the sale of investments		69	6	0
Other investing activities		(11)	(64)	(28)
Net cash provided by (used in) investing activities		(3,080)	(3,361)	(3,161)
Cash Flows from Financing Activities
Issuance of long-term debt		1,465	1,059	1,515
Retirement of long-term debt		(300)	(277)	(168)
Issuance of common stock		1,167	698	453
Payment of common stock dividends		(1,192)	(1,133)	(1,072)
Net increase (decrease) in short-term debt		(278)	363	115
Other financing activities		(26)	(20)	(19)
Net cash provided by (used in) financing activities		836	690	824
Effect of Exchange Rates on Cash, Cash Equivalents and Restricted Cash		10	(18)	15
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		193	132	139
Cash and Cash Equivalents at Beginning of Period		621
Cash and Cash Equivalents at End of Period		815	621
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		643	511	372
Cash, Cash Equivalents and Restricted Cash at End of Period		836	643	511
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		905	910	845
Income taxes - net		93	127	65
Accrued expenditures for property, plant and equipment at December 31,		340	345	360
Accrued expenditures for intangible assets at December 31,		79	64	68
PPL Electric Utilities Corp [Member]
Cash Flows from Operating Activities
Net income	[1]	457	430	362
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		386	352	309
Amortization		24	22	33
Defined benefit plans - expense (income)		0	3	12
Deferred income taxes and investment tax credits		90	125	258
Other		(19)	(4)	(8)
Change in current assets and current liabilities
Accounts receivable		33	47	(57)
Accounts payable		5	10	3
Unbilled Revenues		(14)	7	(13)
Prepayments		(1)	1	3
Taxes payable		1	4	(4)
Regulatory assets and liabilities, net		(43)	(19)	(5)
Other		(11)	10	(1)
Other operating activities
Defined benefit plans - funding		(21)	(28)	(24)
Other assets		15	(37)	15
Other liabilities		11	55	(3)
Net cash provided by operating activities		913	978	880
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(1,114)	(1,192)	(1,244)
Expenditures for intangible assets		(7)	(4)	(10)
Other investing activities		4	3	2
Net cash provided by (used in) investing activities		(1,117)	(1,193)	(1,252)
Cash Flows from Financing Activities
Issuance of long-term debt		393	398	470
Retirement of long-term debt		(100)	0	0
Contributions from parent		400	429	575
Payment of common stock dividends to parent		(486)	(390)	(336)
Net increase (decrease) in short-term debt			0	(295)
Other financing activities		(8)	(4)	(6)
Net cash provided by (used in) financing activities		199	433	408
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		(5)	218	36
Cash and Cash Equivalents at Beginning of Period		267
Cash and Cash Equivalents at End of Period		262	267
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		269	51	15
Cash, Cash Equivalents and Restricted Cash at End of Period		264	269	51
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		154	144	128
Income taxes - net		32	(20)	4
Accrued expenditures for property, plant and equipment at December 31,		180	158	133
LG And E And KU Energy LLC [Member]
Cash Flows from Operating Activities
Net income		468	445	316
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		547	475	439
Amortization		27	18	24
Defined benefit plans - expense (income)		11	17	25
Deferred income taxes and investment tax credits		82	94	294
Other		(3)	(4)	0
Change in current assets and current liabilities
Accounts receivable		(16)	1	(12)
Accounts payable		(26)	39	(9)
Unbilled Revenues		5	34	(33)
Accounts payable to affiliates		2	2	2
Fuel, materials and supplies		0	7	45
Taxes payable		(5)	(3)	27
Regulatory assets and liabilities, net		(45)	32	(7)
Other		(8)	(24)	41
Other operating activities
Defined benefit plans - funding		(34)	(131)	(35)
Other assets		(3)	(24)	8
Expenditures for asset retirement obligations		(89)	(72)	(34)
Other liabilities		25	9	8
Net cash provided by operating activities		938	915	1,099
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(1,094)	(1,117)	(892)
Other investing activities		0	1	4
Net cash provided by (used in) investing activities		(1,094)	(1,116)	(888)
Cash Flows from Financing Activities
Issuance of long-term debt		705	118	160
Issuance of long-term note with affiliate		0	250	0
Retirement of long-term debt		(200)	(27)	(70)
Acquisition of outstanding bonds		(40)	0	0
Remarketing of reacquired bonds		40	0	0
Contributions from member		63	0	0
Distributions to member		(308)	(302)	(402)
Net increase (decrease) in notes payable to affiliates		37	(112)	62
Net increase (decrease) in short-term debt		(126)	270	59
Other financing activities		(12)	(2)	(3)
Net cash provided by (used in) financing activities		159	195	(194)
Net Increase (Decrease) in Cash and Cash Equivalents		3	(6)	17
Cash and Cash Equivalents at Beginning of Period		24	30	13
Cash and Cash Equivalents at End of Period		27	24	30
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		237	218	204
Income taxes - net		29	46	48
Accrued expenditures for property, plant and equipment at December 31,		113	150	174
Louisville Gas And Electric Co [Member]
Cash Flows from Operating Activities
Net income	[2]	232	233	213
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		231	195	183
Amortization		15	14	14
Defined benefit plans - expense (income)		3	3	7
Deferred income taxes and investment tax credits		56	60	126
Other		0	0	1
Change in current assets and current liabilities
Accounts receivable		(9)	4	(7)
Accounts receivable from affiliates		6	0	4
Accounts payable		(10)	10	(7)
Unbilled Revenues		1	14	(16)
Accounts payable to affiliates		5	1	(4)
Fuel, materials and supplies		5	4	12
Taxes payable		7	1	(15)
Regulatory assets and liabilities, net		(19)	5	(5)
Other		(5)	(10)	16
Other operating activities
Defined benefit plans - funding		(6)	(61)	(4)
Other assets		(1)	(12)	5
Expenditures for asset retirement obligations		(30)	(22)	(15)
Other liabilities		11	4	4
Net cash provided by operating activities		492	443	512
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(482)	(554)	(458)
Net cash provided by (used in) investing activities		(482)	(554)	(458)
Cash Flows from Financing Activities
Issuance of long-term debt		399	100	160
Retirement of long-term debt		(200)	0	(70)
Acquisition of outstanding bonds		(40)	0	0
Remarketing of reacquired bonds		40	0	0
Contributions from parent		25	83	30
Payment of common stock dividends to parent		(182)	(156)	(192)
Net increase (decrease) in short-term debt		(41)	80	30
Other financing activities		(6)	(1)	(2)
Net cash provided by (used in) financing activities		(5)	106	(44)
Net Increase (Decrease) in Cash and Cash Equivalents		5	(5)	10
Cash and Cash Equivalents at Beginning of Period		10	15	5
Cash and Cash Equivalents at End of Period		15	10	15
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		77	71	65
Income taxes - net		2	7	22
Accrued expenditures for property, plant and equipment at December 31,		59	61	92
Kentucky Utilities Co [Member]
Cash Flows from Operating Activities
Net income	[3]	293	286	259
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		315	279	255
Amortization		10	3	9
Defined benefit plans - expense (income)		(1)	0	4
Deferred income taxes and investment tax credits		39	48	152
Other		(3)	(4)	0
Change in current assets and current liabilities
Accounts receivable		(3)	(4)	(5)
Accounts payable		(15)	29	0
Unbilled Revenues		4	20	(17)
Accounts payable to affiliates		(2)	(3)	(6)
Fuel, materials and supplies		(6)	3	32
Taxes payable		2	5	(26)
Regulatory assets and liabilities, net		(26)	27	(2)
Other		(6)	(3)	9
Other operating activities
Defined benefit plans - funding		(3)	(54)	(23)
Other assets		(2)	(12)	3
Expenditures for asset retirement obligations		(59)	(50)	(19)
Other liabilities		16	11	9
Net cash provided by operating activities		553	581	634
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(610)	(562)	(432)
Other investing activities		0	1	4
Net cash provided by (used in) investing activities		(610)	(561)	(428)
Cash Flows from Financing Activities
Issuance of long-term debt		306	18	0
Retirement of long-term debt		0	(27)	0
Contributions from parent		68	45	0
Payment of common stock dividends to parent		(229)	(246)	(226)
Net increase (decrease) in short-term debt		(85)	190	29
Other financing activities		(5)	(1)	(1)
Net cash provided by (used in) financing activities		55	(21)	(198)
Net Increase (Decrease) in Cash and Cash Equivalents		(2)	(1)	8
Cash and Cash Equivalents at Beginning of Period		14	15	7
Cash and Cash Equivalents at End of Period		12	14	15
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		101	95	92
Income taxes - net		39	25	34
Accrued expenditures for property, plant and equipment at December 31,		$ 54	$ 88	$ 82

[1] Net income equals comprehensive income.

[2] Net income equals comprehensive income.

[3] Net income approximates comprehensive income.