CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities
Net Income		$ 452	$ 403
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		269	242
Amortization		21	23
Defined benefit plans - (income) expense		(50)	(19)
Deferred income taxes and investment tax credits		59	161
Unrealized losses on derivatives, and other hedging activities		85	35
Stock-based compensation expense		15	19
Other		(3)	(1)
Change in current assets and current liabilities
Accounts receivable		(71)	(43)
Accounts payable		(36)	(84)
Unbilled revenues		58	52
Fuel, materials and supplies		43	44
Prepayments		(73)	(110)
Taxes payable		22	(21)
Regulatory assets and liabilities, net		64	(17)
Other current liabilities		(120)	(60)
Other		23	22
Other operating activities
Defined benefit plans - funding		(150)	(520)
Other assets		(30)	5
Other liabilities		(12)	4
Net cash provided by operating activities		566	135
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(750)	(677)
Expenditures for intangible assets		(7)	(3)
Other investing activities		4	1
Net cash used in investing activities		(753)	(679)
Cash Flows from Financing Activities
Issuance of long-term debt		144	64
Issuance of common stock		100	73
Payment of common stock dividends		(273)	(258)
Net increase (decrease) in short-term debt		369	744
Other financing activities		(9)	(16)
Net cash provided by (used in) financing activities		331	607
Effect of Exchange Rate on Cash, Cash Equivalents and Restricted Cash		(2)	3
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		142	66
Cash and Cash Equivalents at Beginning of Period		485
Cash and Cash Equivalents at End of Period		629
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		511	367
Cash, Cash Equivalents and Restricted Cash at End of Period		653	433
Supplemental Disclosures of Cash Flow Information
Accrued expenditures for property, plant and equipment at March 31,		313	236
Accrued expenditures for intangible assets at March 31,		65	62
PPL Electric Utilities Corp [Member]
Cash Flows from Operating Activities
Net Income	[1]	148	79
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		85	75
Amortization		6	8
Defined benefit plans - (income) expense		2	5
Deferred income taxes and investment tax credits		21	41
Other		(5)	0
Change in current assets and current liabilities
Accounts receivable		(30)	(27)
Accounts payable		(36)	(18)
Unbilled revenues		16	12
Prepayments		(69)	(75)
Taxes payable		4	0
Regulatory assets and liabilities, net		5	(11)
Other		(19)	(14)
Other operating activities
Defined benefit plans - funding		(28)	(24)
Other assets		(25)	5
Other liabilities		1	(1)
Net cash provided by operating activities		76	55
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(245)	(274)
Expenditures for intangible assets		(1)	(2)
Net cash used in investing activities		(246)	(276)
Cash Flows from Financing Activities
Net increase (decrease) in short-term debt		213	204
Contributions from parent		0	100
Payment of common stock dividends to parent		(72)	(76)
Net cash provided by (used in) financing activities		141	228
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		(29)	7
Cash and Cash Equivalents at Beginning of Period		49
Cash and Cash Equivalents at End of Period		20
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		51	15
Cash, Cash Equivalents and Restricted Cash at End of Period		22	22
Supplemental Disclosures of Cash Flow Information
Accrued expenditures for property, plant and equipment at March 31,		147	122
LG And E And KU Energy LLC [Member]
Cash Flows from Operating Activities
Net Income	[2]	142	103
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		117	105
Amortization		5	7
Defined benefit plans - (income) expense		3	8
Deferred income taxes and investment tax credits		8	48
Change in current assets and current liabilities
Accounts receivable		(5)	21
Accounts payable		10	(28)
Accounts payable to affiliates		2	7
Unbilled revenues		31	22
Fuel, materials and supplies		42	41
Taxes payable		7	(2)
Accrued interest		42	42
Other		(7)	(38)
Other operating activities
Defined benefit plans - funding		(108)	(22)
Expenditures for asset retirement obligations		(9)	(6)
Other assets		(3)	1
Other liabilities		1	3
Net cash provided by operating activities		278	312
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(294)	(184)
Net cash used in investing activities		(294)	(184)
Cash Flows from Financing Activities
Net increase (decrease) in notes payable with affiliate		12	(81)
Issuance of long-term debt		100	0
Distributions to member		(69)	(102)
Net increase (decrease) in short-term debt		(29)	58
Other financing activities		(1)	(1)
Net cash provided by (used in) financing activities		13	(126)
Cash and Cash Equivalents, Period Increase (Decrease)		(3)	2
Cash and Cash Equivalents at Beginning of Period		30	13
Cash and Cash Equivalents at End of Period		27	15
Supplemental Disclosures of Cash Flow Information
Accrued expenditures for property, plant and equipment at March 31,		124	75
Louisville Gas And Electric Co [Member]
Cash Flows from Operating Activities
Net Income	[1]	72	54
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		48	44
Amortization		4	3
Defined benefit plans - (income) expense		1	2
Deferred income taxes and investment tax credits		7	31
Change in current assets and current liabilities
Accounts receivable		2	13
Accounts receivable from affiliates		(7)	1
Accounts payable		8	(12)
Accounts payable to affiliates		(2)	(4)
Unbilled revenues		16	9
Fuel, materials and supplies		36	33
Taxes payable		(1)	(28)
Accrued interest		13	13
Other		12	(11)
Other operating activities
Defined benefit plans - funding		(55)	(1)
Expenditures for asset retirement obligations		(5)	(4)
Other assets		0	2
Other liabilities		(3)	(3)
Net cash provided by operating activities		146	142
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(150)	(94)
Net cash used in investing activities		(150)	(94)
Cash Flows from Financing Activities
Issuance of long-term debt		100	0
Net increase (decrease) in short-term debt		(62)	38
Payment of common stock dividends to parent		(34)	(87)
Other financing activities		(1)	0
Net cash provided by (used in) financing activities		3	(49)
Cash and Cash Equivalents, Period Increase (Decrease)		(1)	(1)
Cash and Cash Equivalents at Beginning of Period		15	5
Cash and Cash Equivalents at End of Period		14	4
Supplemental Disclosures of Cash Flow Information
Accrued expenditures for property, plant and equipment at March 31,		75	34
Kentucky Utilities Co [Member]
Cash Flows from Operating Activities
Net Income	[2]	87	63
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		68	60
Amortization		1	4
Defined benefit plans - (income) expense		0	2
Deferred income taxes and investment tax credits		1	37
Change in current assets and current liabilities
Accounts receivable		(7)	8
Accounts payable		11	(4)
Accounts payable to affiliates		0	(7)
Unbilled revenues		15	13
Fuel, materials and supplies		6	8
Taxes payable		14	(34)
Accrued interest		22	22
Other		17	(12)
Other operating activities
Defined benefit plans - funding		(47)	(19)
Expenditures for asset retirement obligations		(4)	(2)
Other assets		(3)	(1)
Other liabilities		4	1
Net cash provided by operating activities		185	139
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(143)	(89)
Net cash used in investing activities		(143)	(89)
Cash Flows from Financing Activities
Net increase (decrease) in short-term debt		33	20
Payment of common stock dividends to parent		(79)	(70)
Net cash provided by (used in) financing activities		(46)	(50)
Cash and Cash Equivalents, Period Increase (Decrease)		(4)	0
Cash and Cash Equivalents at Beginning of Period		15	7
Cash and Cash Equivalents at End of Period		11	7
Supplemental Disclosures of Cash Flow Information
Accrued expenditures for property, plant and equipment at March 31,		$ 48	$ 41

[1] Net income equals comprehensive income.

[2] Net income approximates comprehensive income.