CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities
Net Income		$ 967	$ 695
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		542	488
Amortization		34	45
Defined benefit plans - (income) expense		(101)	(45)
Deferred income taxes and investment tax credits		171	201
Unrealized (gains) losses on derivatives, and other hedging activities		(91)	135
Stock-based compensation expense		16	22
Other		(9)	(5)
Change in current assets and current liabilities
Accounts receivable		46	26
Accounts payable		(90)	(92)
Unbilled revenues		91	70
Fuel, materials and supplies		32	42
Prepayments		(60)	(66)
Taxes payable		28	(27)
Regulatory assets and liabilities, net		42	(19)
Accrued interest		(79)	(77)
Other current liabilities		(47)	(52)
Other		(16)	13
Other operating activities
Defined benefit plans - funding		(206)	(552)
Proceeds from transfer of excess benefit funding		65	0
Other assets		(67)	(1)
Other liabilities		57	(11)
Net cash provided by operating activities		1,325	790
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(1,527)	(1,373)
Purchase of available-for-sale securities		(65)	0
Other investing activities		(57)	(12)
Net cash used in investing activities		(1,649)	(1,385)
Cash Flows from Financing Activities
Issuance of long-term debt		584	594
Retirement of long-term debt		(250)	(60)
Issuance of common stock		147	177
Payment of common stock dividends		(558)	(529)
Net increase (decrease) in short-term debt		788	554
Other financing activities		(16)	(25)
Net cash provided by (used in) financing activities		695	711
Effect of Exchange Rate on Cash, Cash Equivalents and Restricted Cash		(7)	7
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		364	123
Cash and Cash Equivalents at Beginning of Period		485
Cash and Cash Equivalents at End of Period		852
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		511	367
Cash, Cash Equivalents and Restricted Cash at End of Period		875	490
Supplemental Disclosures of Cash Flow Information
Accrued expenditures for property, plant and equipment at June 30,		329	284
Accrued expenditures for intangible assets at June 30,		59	56
PPL Electric Utilities Corp [Member]
Cash Flows from Operating Activities
Net Income	[1]	223	156
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		173	151
Amortization		11	15
Defined benefit plans - (income) expense		0	7
Deferred income taxes and investment tax credits		53	84
Other		(9)	(4)
Change in current assets and current liabilities
Accounts receivable		37	13
Accounts payable		(60)	(59)
Unbilled revenues		30	17
Prepayments		(47)	(52)
Taxes payable		(1)	(4)
Regulatory assets and liabilities, net		(27)	(12)
Other		1	(6)
Other operating activities
Defined benefit plans - funding		(28)	(24)
Other assets		(41)	(4)
Other liabilities		49	1
Net cash provided by operating activities		364	279
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(518)	(550)
Net decrease in notes receivable from affiliate		0	(270)
Other investing activities		(3)	(4)
Net cash used in investing activities		(521)	(824)
Cash Flows from Financing Activities
Issuance of long-term debt		398	470
Net increase (decrease) in short-term debt		0	(295)
Contributions from parent		425	575
Payment of common stock dividends to parent		(222)	(154)
Other financing activities		(4)	(5)
Net cash provided by (used in) financing activities		597	591
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash		440	46
Cash and Cash Equivalents at Beginning of Period		49
Cash and Cash Equivalents at End of Period		489
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		51	15
Cash, Cash Equivalents and Restricted Cash at End of Period		491	61
Supplemental Disclosures of Cash Flow Information
Accrued expenditures for property, plant and equipment at June 30,		180	157
LG And E And KU Energy LLC [Member]
Cash Flows from Operating Activities
Net Income	[2]	228	190
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		235	210
Amortization		9	14
Defined benefit plans - (income) expense		8	12
Deferred income taxes and investment tax credits		30	91
Other		(1)	0
Change in current assets and current liabilities
Accounts receivable		16	13
Accounts payable		(10)	(28)
Accounts payable to affiliates		1	0
Unbilled revenues		40	23
Fuel, materials and supplies		26	41
Taxes payable		(25)	3
Regulatory assets and liabilities, net		69	(7)
Other		(40)	(14)
Other operating activities
Defined benefit plans - funding		(122)	(29)
Expenditures for asset retirement obligations		(26)	(12)
Other assets		(1)	(2)
Other liabilities		3	6
Net cash provided by operating activities		440	511
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(564)	(355)
Net cash used in investing activities		(564)	(355)
Cash Flows from Financing Activities
Net increase (decrease) in notes payable with affiliate		(126)	(4)
Issuance of long-term debt with affiliate		250	0
Issuance of long-term debt		100	60
Retirement of long-term debt		0	(60)
Distributions to member		(161)	(218)
Net increase (decrease) in short-term debt		72	73
Other financing activities		(2)	(1)
Net cash provided by (used in) financing activities		133	(150)
Cash and Cash Equivalents, Period Increase (Decrease)		9	6
Cash and Cash Equivalents at Beginning of Period		30	13
Cash and Cash Equivalents at End of Period		39	19
Supplemental Disclosures of Cash Flow Information
Accrued expenditures for property, plant and equipment at June 30,		112	83
Louisville Gas And Electric Co [Member]
Cash Flows from Operating Activities
Net Income	[1]	122	96
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		97	89
Amortization		7	7
Defined benefit plans - (income) expense		2	3
Deferred income taxes and investment tax credits		18	57
Change in current assets and current liabilities
Accounts receivable		11	9
Accounts receivable from affiliates		6	11
Accounts payable		(12)	(17)
Accounts payable to affiliates		(3)	(3)
Unbilled revenues		24	14
Fuel, materials and supplies		31	33
Taxes payable		(2)	(23)
Regulatory assets and liabilities, net		32	(3)
Other		(7)	0
Other operating activities
Defined benefit plans - funding		(57)	(3)
Expenditures for asset retirement obligations		(10)	(7)
Other liabilities		(4)	1
Net cash provided by operating activities		255	264
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(296)	(177)
Net cash used in investing activities		(296)	(177)
Cash Flows from Financing Activities
Issuance of long-term debt		100	60
Retirement of long-term debt		0	(60)
Net increase (decrease) in short-term debt		(16)	38
Contributions from parent		43	0
Payment of common stock dividends to parent		(81)	(122)
Other financing activities		(1)	(1)
Net cash provided by (used in) financing activities		45	(85)
Cash and Cash Equivalents, Period Increase (Decrease)		4	2
Cash and Cash Equivalents at Beginning of Period		15	5
Cash and Cash Equivalents at End of Period		19	7
Supplemental Disclosures of Cash Flow Information
Accrued expenditures for property, plant and equipment at June 30,		57	40
Kentucky Utilities Co [Member]
Cash Flows from Operating Activities
Net Income	[2]	148	119
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation		138	121
Amortization		2	6
Defined benefit plans - (income) expense		0	2
Deferred income taxes and investment tax credits		9	70
Other		(1)	0
Change in current assets and current liabilities
Accounts receivable		4	5
Accounts payable		11	(1)
Accounts payable to affiliates		(12)	(15)
Unbilled revenues		16	9
Fuel, materials and supplies		(5)	8
Taxes payable		4	(29)
Regulatory assets and liabilities, net		37	(4)
Other		(11)	(9)
Other operating activities
Defined benefit plans - funding		(52)	(21)
Expenditures for asset retirement obligations		(16)	(5)
Other assets		(1)	(3)
Other liabilities		3	4
Net cash provided by operating activities		274	257
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(266)	(177)
Net cash used in investing activities		(266)	(177)
Cash Flows from Financing Activities
Net increase (decrease) in short-term debt		88	35
Contributions from parent		45	0
Payment of common stock dividends to parent		(136)	(110)
Net cash provided by (used in) financing activities		(3)	(75)
Cash and Cash Equivalents, Period Increase (Decrease)		5	5
Cash and Cash Equivalents at Beginning of Period		15	7
Cash and Cash Equivalents at End of Period		20	12
Supplemental Disclosures of Cash Flow Information
Accrued expenditures for property, plant and equipment at June 30,		$ 55	$ 43

[1] Net income equals comprehensive income.

[2] Net income approximates comprehensive income.