CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities
Net income		$ 1,827	$ 1,128	$ 1,902
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		1,094	1,008	926
Amortization		78	97	80
Defined benefit plans - expense (income)		(192)	(95)	(40)
Deferred income taxes and investment tax credits		355	707	560
Unrealized (gains) losses on derivatives, and other hedging activities		(186)	178	19
Stock compensation expense		26	38	28
Other		(3)	(9)	(12)
Change in current assets and current liabilities
Accounts receivable		28	(33)	(15)
Accounts payable		78	(10)	57
Unbilled Revenues		41	(48)	(63)
Fuel, materials and supplies		17	40	(3)
Customer Deposits		(35)	16	(50)
Regulatory assets and liabilities, net		13	(12)	(59)
Other Current Liabilities		(22)	6	(6)
Other		33	(5)	55
Other operating activities
Defined benefit plans - funding		(361)	(565)	(427)
Proceeds from transfer of excess benefit plan funds		65	0	0
Other assets		(75)	32	33
Other liabilities		40	(12)	(95)
Net cash provided by operating activities		2,821	2,461	2,890
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(3,238)	(3,133)	(2,920)
Purchase of available-for-sale securities		(65)	0	0
Other investing activities		(58)	(28)	(6)
Net cash provided by (used in) investing activities		(3,361)	(3,161)	(2,926)
Cash Flows from Financing Activities
Issuance of long-term debt		1,059	1,515	1,342
Retirement of long-term debt		(277)	(168)	(930)
Issuance of common stock		698	453	144
Payment of common stock dividends		(1,133)	(1,072)	(1,030)
Net increase (decrease) in short-term debt		363	115	29
Other financing activities		(20)	(19)	6
Net cash provided by (used in) financing activities		690	824	(439)
Effect of Exchange Rates on Cash, Cash Equivalents and Restricted Cash		(18)	15	(28)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		132	139	(503)
Cash and Cash Equivalents at Beginning of Period		485
Cash and Cash Equivalents at End of Period		621	485
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		511	372	875
Cash, Cash Equivalents and Restricted Cash at End of Period		643	511	372
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		910	845	854
Income taxes - net		127	65	70
Accrued expenditures for property, plant and equipment at December 31,		345	360	281
Accrued expenditures for intangible assets at December 31,		64	68	117
PPL Electric Utilities Corp [Member]
Cash Flows from Operating Activities
Net income	[1]	430	362	340
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		352	309	253
Amortization		22	33	32
Defined benefit plans - expense (income)		3	12	11
Deferred income taxes and investment tax credits		125	258	221
Other		(4)	(8)	(13)
Change in current assets and current liabilities
Accounts receivable		47	(57)	16
Accounts payable		10	3	58
Unbilled Revenues		7	(13)	(23)
Prepayments		1	3	43
Taxes payable		4	(4)	(12)
Regulatory assets and liabilities, net		(19)	(5)	(62)
Other		10	(1)	(7)
Other operating activities
Defined benefit plans - funding		(28)	(24)	0
Other assets		(37)	15	19
Other liabilities		55	(3)	(4)
Net cash provided by operating activities		978	880	872
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(1,192)	(1,244)	(1,125)
Expenditures for intangible assets		(4)	(10)	(9)
Other investing activities		3	2	4
Net cash provided by (used in) investing activities		(1,193)	(1,252)	(1,130)
Cash Flows from Financing Activities
Issuance of long-term debt		398	470	224
Retirement of long-term debt		0	0	(224)
Contributions from parent		429	575	220
Payment of common stock dividends to parent		(390)	(336)	(288)
Net increase (decrease) in short-term debt		0	(295)	295
Other financing activities		(4)	(6)	(3)
Net cash provided by (used in) financing activities		433	408	224
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		218	36	(34)
Cash and Cash Equivalents at Beginning of Period		49
Cash and Cash Equivalents at End of Period		267	49
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		51	15	49
Cash, Cash Equivalents and Restricted Cash at End of Period		269	51	15
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		144	128	115
Income taxes - net		(20)	4	(48)
Accrued expenditures for property, plant and equipment at December 31,		158	133	126
LG And E And KU Energy LLC [Member]
Cash Flows from Operating Activities
Net income		445	316	429
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		475	439	404
Amortization		18	24	29
Defined benefit plans - expense (income)		17	25	27
Deferred income taxes and investment tax credits		94	294	291
Other		(4)	0	0
Change in current assets and current liabilities
Accounts receivable		1	(12)	(31)
Accounts payable		39	(9)	24
Unbilled Revenues		34	(33)	(23)
Accounts payable to affiliates		2	2	1
Fuel, materials and supplies		7	45	2
Taxes payable		(3)	27	(7)
Regulatory assets and liabilities, net		32	(7)	1
Other		(24)	41	(6)
Other operating activities
Defined benefit plans - funding		(131)	(35)	(85)
Settlement of interest rate swaps		0	0	(9)
Expenditures for asset retirement obligations		(72)	(34)	(26)
Other assets		(24)	8	2
Other liabilities		9	8	4
Net cash provided by operating activities		915	1,099	1,027
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(1,117)	(892)	(791)
Other investing activities		1	4	1
Net cash provided by (used in) investing activities		(1,116)	(888)	(790)
Cash Flows from Financing Activities
Issuance of long-term debt		118	160	221
Issuance of long-term note with affiliate		250	0	0
Retirement of long-term debt		(27)	(70)	(246)
Contributions from member		0	0	61
Distributions to member		(302)	(402)	(316)
Net increase (decrease) in notes payable to affiliates		(112)	62	109
Net increase (decrease) in short-term debt		270	59	(80)
Other financing activities		(2)	(3)	(3)
Net cash provided by (used in) financing activities		195	(194)	(254)
Net Increase (Decrease) in Cash and Cash Equivalents		(6)	17	(17)
Cash and Cash Equivalents at Beginning of Period		30	13	30
Cash and Cash Equivalents at End of Period		24	30	13
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		218	204	198
Income taxes - net		46	48	(24)
Accrued expenditures for property, plant and equipment at December 31,		150	174	104
Louisville Gas And Electric Co [Member]
Cash Flows from Operating Activities
Net income	[2]	233	213	203
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		195	183	170
Amortization		14	14	14
Defined benefit plans - expense (income)		3	7	8
Deferred income taxes and investment tax credits		60	126	147
Other		0	1	0
Change in current assets and current liabilities
Accounts receivable		4	(7)	(22)
Accounts receivable from affiliates		0	4	(16)
Accounts payable		10	(7)	31
Unbilled Revenues		14	(16)	(8)
Accounts payable to affiliates		1	(4)	1
Fuel, materials and supplies		4	12	8
Taxes payable		1	(15)	20
Regulatory assets and liabilities, net		5	(5)	(1)
Other		(10)	16	(2)
Other operating activities
Defined benefit plans - funding		(61)	(4)	(46)
Settlement of interest rate swaps		0	0	(9)
Expenditures for asset retirement obligations		(22)	(15)	(18)
Other assets		(12)	5	0
Other liabilities		4	4	2
Net cash provided by operating activities		443	512	482
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(554)	(458)	(439)
Net cash provided by (used in) investing activities		(554)	(458)	(439)
Cash Flows from Financing Activities
Issuance of long-term debt		100	160	125
Retirement of long-term debt		0	(70)	(150)
Contributions from parent		83	30	71
Payment of common stock dividends to parent		(156)	(192)	(128)
Net increase (decrease) in short-term debt		80	30	27
Other financing activities		(1)	(2)	(2)
Net cash provided by (used in) financing activities		106	(44)	(57)
Net Increase (Decrease) in Cash and Cash Equivalents		(5)	10	(14)
Cash and Cash Equivalents at Beginning of Period		15	5	19
Cash and Cash Equivalents at End of Period		10	15	5
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		71	65	65
Income taxes - net		7	22	(43)
Accrued expenditures for property, plant and equipment at December 31,		61	92	56
Kentucky Utilities Co [Member]
Cash Flows from Operating Activities
Net income	[3]	286	259	265
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		279	255	234
Amortization		3	9	14
Defined benefit plans - expense (income)		0	4	5
Deferred income taxes and investment tax credits		48	152	126
Other		(4)	0	(1)
Change in current assets and current liabilities
Accounts receivable		(4)	(5)	(8)
Accounts payable		29	0	(10)
Unbilled Revenues		20	(17)	(15)
Accounts payable to affiliates		(3)	(6)	15
Fuel, materials and supplies		3	32	(6)
Taxes payable		5	(26)	25
Regulatory assets and liabilities, net		27	(2)	2
Other		(3)	9	(4)
Other operating activities
Defined benefit plans - funding		(54)	(23)	(20)
Expenditures for asset retirement obligations		(50)	(19)	(8)
Other assets		(12)	3	(6)
Other liabilities		11	9	(2)
Net cash provided by operating activities		581	634	606
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(562)	(432)	(350)
Other investing activities		1	4	1
Net cash provided by (used in) investing activities		(561)	(428)	(349)
Cash Flows from Financing Activities
Issuance of long-term debt		18	0	96
Retirement of long-term debt		(27)	0	(96)
Contributions from parent		45	0	20
Payment of common stock dividends to parent		(246)	(226)	(248)
Net increase (decrease) in short-term debt		190	29	(32)
Other financing activities		(1)	(1)	(1)
Net cash provided by (used in) financing activities		(21)	(198)	(261)
Net Increase (Decrease) in Cash and Cash Equivalents		(1)	8	(4)
Cash and Cash Equivalents at Beginning of Period		15	7	11
Cash and Cash Equivalents at End of Period		14	15	7
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		95	92	89
Income taxes - net		25	34	13
Accrued expenditures for property, plant and equipment at December 31,		$ 88	$ 82	$ 47

[1] Net income equals comprehensive income.

[2] Net income equals comprehensive income.

[3] Net income approximates comprehensive income.