CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows from Operating Activities
Net income		$ 1,128	$ 1,902	$ 682
Loss from Discontinued Operations (net of income taxes)		0	0	921
Income from continuing operations (net of income taxes)		1,128	1,902	1,603
Adjustments to reconcile income from continuing operations (net of taxes) to net cash provided by (used in) operating activities - continuing operations
Depreciation		1,008	926	883
Amortization		97	80	59
Defined benefit plans - expense (income)		(95)	(40)	56
Deferred income taxes and investment tax credits		707	560	428
Unrealized (gains) losses on derivatives, and other hedging activities		178	19	(77)
Stock compensation expense		38	28	31
Other		(9)	(12)	(14)
Change in current assets and current liabilities
Accounts receivable		(33)	(15)	47
Accounts payable		(10)	57	(116)
Unbilled Revenues		(48)	(63)	54
Fuel, materials and supplies		40	(3)	24
Taxes payable		3	31	(175)
Regulatory assets and liabilities		(12)	(59)	42
Other		14	(32)	(7)
Other operating activities
Defined benefit plans - funding		(565)	(427)	(499)
Settlement of interest rate swaps		2	(9)	(101)
Other assets		30	42	(19)
Other liabilities		(12)	(95)	53
Net cash provided by operating activities - continuing operations		2,461	2,890	2,272
Net cash provided by operating activities - discontinued operations		0	0	343
Net cash provided by (used in) operating activities		2,461	2,890	2,615
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(3,133)	(2,920)	(3,533)
Expenditures for intangible assets		(38)	(37)	(37)
Proceeds from the sale of other investments		0	2	136
Other investing activities		15	37	(5)
Net cash used in investing activities - continuing operations		(3,156)	(2,918)	(3,439)
Net cash used in investing activities - discontinued operations		0	0	(149)
Net cash provided by (used in) investing activities		(3,156)	(2,918)	(3,588)
Cash Flows from Financing Activities
Issuance of long-term debt		1,515	1,342	2,236
Retirement of long-term debt		(168)	(930)	(1,000)
Issuance of common stock		453	144	203
Payment of common stock dividends		(1,072)	(1,030)	(1,004)
Net increase (decrease) in short-term debt		115	29	94
Other financing activities		(19)	6	(47)
Net cash used in financing activities - discontinued operations		0	0	(546)
Net cash distributions to parent from discontinued operations		0		132
Net cash provided by (used in) financing activities		824	(439)	68
Effect of Exchange Rates on Cash and Cash Equivalents		15	(28)	(10)
Net (Increase) Decrease in Cash and Cash Equivalents included in Discontinued Operations		0	0	352
Net Increase (Decrease) in Cash and Cash Equivalents		144	(495)	(563)
Cash and Cash Equivalents at Beginning of Period		341	836	1,399
Cash and Cash Equivalents at End of Period		485	341	836
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		845	854	822
Income taxes - net		65	70	179
Accrued expenditures for property, plant and equipment at December 31,		360	281	310
Accrued expenditures for intangible assets at December 31,		68	117	55
PPL Electric Utilities Corp [Member]
Cash Flows from Operating Activities
Net income	[1]	362	340	252
Adjustments to reconcile income from continuing operations (net of taxes) to net cash provided by (used in) operating activities - continuing operations
Depreciation		309	253	214
Amortization		33	32	26
Defined benefit plans - expense (income)		12	11	16
Deferred income taxes and investment tax credits		258	221	220
Other		(8)	(13)	(12)
Change in current assets and current liabilities
Accounts receivable		(57)	16	50
Accounts payable		3	58	(107)
Unbilled Revenues		(13)	(23)	22
Prepayments		3	43	(1)
Taxes payable		(4)	(12)	(108)
Regulatory assets and liabilities		(5)	(62)	35
Other		(1)	(7)	21
Other operating activities
Defined benefit plans - funding		(24)	0	(33)
Other assets		15	19	(10)
Other liabilities		(3)	(4)	17
Net cash provided by (used in) operating activities		880	872	602
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(1,244)	(1,125)	(1,097)
Expenditures for intangible assets		(10)	(9)	(10)
Other investing activities		2	4	(1)
Net cash provided by (used in) investing activities		(1,252)	(1,130)	(1,108)
Cash Flows from Financing Activities
Issuance of long-term debt		470	224	348
Retirement of long-term debt		0	(224)	(100)
Contributions from parent		575	220	275
Payment of common stock dividends to parent		(336)	(288)	(181)
Net increase (decrease) in short-term debt		(295)	295	0
Other financing activities		(6)	(3)	(3)
Net cash provided by (used in) financing activities		408	224	339
Net Increase (Decrease) in Cash and Cash Equivalents		36	(34)	(167)
Cash and Cash Equivalents at Beginning of Period		13	47	214
Cash and Cash Equivalents at End of Period		49	13	47
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		128	115	117
Income taxes - net		4	(48)	38
Accrued expenditures for property, plant and equipment at December 31,		133	126	98
LG And E And KU Energy LLC [Member]
Cash Flows from Operating Activities
Net income		316	429	364
Adjustments to reconcile income from continuing operations (net of taxes) to net cash provided by (used in) operating activities - continuing operations
Depreciation		439	404	382
Amortization		24	29	27
Defined benefit plans - expense (income)		25	27	38
Deferred income taxes and investment tax credits		294	291	236
Other		0	0	2
Change in current assets and current liabilities
Accounts receivable		(12)	(31)	24
Accounts payable		(9)	24	(58)
Unbilled Revenues		(33)	(23)	20
Accounts payable to affiliates		2	1	(2)
Fuel, materials and supplies		45	2	6
Income tax receivable		0	1	135
Taxes payable		27	(7)	10
Accrued interest		0	0	9
Other		34	(6)	23
Other operating activities
Defined benefit plans - funding		(35)	(85)	(70)
Settlement of interest rate swaps		0	(9)	(88)
Expenditures for asset retirement obligations		(34)	(26)	(7)
Other assets		8	2	(7)
Other liabilities		8	4	19
Net cash provided by (used in) operating activities		1,099	1,027	1,063
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(892)	(791)	(1,210)
Other investing activities		4	1	7
Net cash provided by (used in) investing activities		(888)	(790)	(1,203)
Cash Flows from Financing Activities
Issuance of long-term debt		160	221	1,050
Issuance of long-term note with affiliate		0	0	400
Retirement of long-term debt		(70)	(246)	(900)
Contributions from member		0	61	125
Distributions to member		(402)	(316)	(219)
Net increase (decrease) in notes payable to affiliates		62	109	13
Net increase (decrease) in short-term debt		59	(80)	(310)
Other financing activities		(3)	(3)	(10)
Net cash provided by (used in) financing activities		(194)	(254)	149
Net Increase (Decrease) in Cash and Cash Equivalents		17	(17)	9
Cash and Cash Equivalents at Beginning of Period		13	30	21
Cash and Cash Equivalents at End of Period		30	13	30
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		204	198	163
Income taxes - net		48	(24)	(139)
Accrued expenditures for property, plant and equipment at December 31,		174	104	150
Louisville Gas And Electric Co [Member]
Cash Flows from Operating Activities
Net income	[2]	213	203	185
Adjustments to reconcile income from continuing operations (net of taxes) to net cash provided by (used in) operating activities - continuing operations
Depreciation		183	170	162
Amortization		14	14	11
Defined benefit plans - expense (income)		7	8	12
Deferred income taxes and investment tax credits		126	147	126
Other		1	0	8
Change in current assets and current liabilities
Accounts receivable		(7)	(22)	19
Accounts receivable from affiliates		4	(16)	11
Accounts payable		(7)	31	(29)
Unbilled Revenues		(16)	(8)	9
Accounts payable to affiliates		(4)	1	5
Fuel, materials and supplies		12	8	3
Income tax receivable		0	4	70
Taxes payable		(15)	20	1
Accrued interest		0	0	5
Other		11	(7)	17
Other operating activities
Defined benefit plans - funding		(4)	(46)	(26)
Settlement of interest rate swaps		0	(9)	(44)
Expenditures for asset retirement obligations		(15)	(18)	(6)
Other assets		5	0	11
Other liabilities		4	2	4
Net cash provided by (used in) operating activities		512	482	554
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(458)	(439)	(689)
Net cash provided by (used in) investing activities		(458)	(439)	(689)
Cash Flows from Financing Activities
Issuance of long-term debt		160	125	550
Retirement of long-term debt		(70)	(150)	(250)
Contributions from parent		30	71	90
Payment of common stock dividends to parent		(192)	(128)	(119)
Net increase (decrease) in short-term debt		30	27	(122)
Other financing activities		(2)	(2)	(5)
Net cash provided by (used in) financing activities		(44)	(57)	144
Net Increase (Decrease) in Cash and Cash Equivalents		10	(14)	9
Cash and Cash Equivalents at Beginning of Period		5	19	10
Cash and Cash Equivalents at End of Period		15	5	19
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		65	65	48
Income taxes - net		22	(43)	(81)
Accrued expenditures for property, plant and equipment at December 31,		92	56	97
Kentucky Utilities Co [Member]
Cash Flows from Operating Activities
Net income	[3]	259	265	234
Adjustments to reconcile income from continuing operations (net of taxes) to net cash provided by (used in) operating activities - continuing operations
Depreciation		255	234	220
Amortization		9	14	13
Defined benefit plans - expense (income)		4	5	10
Deferred income taxes and investment tax credits		152	126	160
Other		0	(1)	(5)
Change in current assets and current liabilities
Accounts receivable		(5)	(8)	5
Accounts receivable from affiliates		0	1	(1)
Accounts payable		0	(10)	(32)
Unbilled Revenues		(17)	(15)	11
Accounts payable to affiliates		(6)	15	(10)
Fuel, materials and supplies		32	(6)	3
Income tax receivable		0	0	59
Taxes payable		(26)	25	6
Accrued interest		0	0	5
Other		7	(3)	4
Other operating activities
Defined benefit plans - funding		(23)	(20)	(21)
Settlement of interest rate swaps		0	0	(44)
Expenditures for asset retirement obligations		(19)	(8)	(1)
Other assets		3	(6)	(11)
Other liabilities		9	(2)	3
Net cash provided by (used in) operating activities		634	606	608
Cash Flows from Investing Activities
Expenditures for property, plant and equipment		(432)	(350)	(519)
Other investing activities		4	1	7
Net cash provided by (used in) investing activities		(428)	(349)	(512)
Cash Flows from Financing Activities
Issuance of long-term debt		0	96	500
Retirement of long-term debt		0	(96)	(250)
Contributions from parent		0	20	0
Payment of common stock dividends to parent		(226)	(248)	(153)
Net increase (decrease) in short-term debt		29	(32)	(188)
Other financing activities		(1)	(1)	(5)
Net cash provided by (used in) financing activities		(198)	(261)	(96)
Net Increase (Decrease) in Cash and Cash Equivalents		8	(4)	0
Cash and Cash Equivalents at Beginning of Period		7	11	11
Cash and Cash Equivalents at End of Period		15	7	11
Supplemental Disclosures of Cash Flow Information:
Interest - net of amount capitalized		92	89	75
Income taxes - net		34	13	(84)
Accrued expenditures for property, plant and equipment at December 31,		$ 82	$ 47	$ 53

[1] Net income equals comprehensive income.

[2] Net income equals comprehensive income.

[3] Net income approximates comprehensive income.