Segment and Related Information (Income Statement and Balance Sheet Data) (Details) $ in Millions		3 Months Ended																12 Months Ended
		Dec. 31, 2015 USD ($)		Sep. 30, 2015 USD ($)		Jun. 30, 2015 USD ($)		Mar. 31, 2015 USD ($)		Dec. 31, 2014 USD ($)		Sep. 30, 2014 USD ($)		Jun. 30, 2014 USD ($)		Mar. 31, 2014 USD ($)		Dec. 31, 2015 USD ($) Integer		Dec. 31, 2014 USD ($)		Dec. 31, 2013 USD ($)
Segment Information (Numeric) [Abstract]
Number of reportable segments | Integer																		3
Income Statement Data
Revenues		$ 1,780	[1]	$ 1,878	[1]	$ 1,781	[1]	$ 2,230	[1]	$ 1,946	[1]	$ 1,879	[1]	$ 1,849	[1]	$ 2,178	[1]	$ 7,669		$ 7,852		$ 7,263
Depreciation																		883		923		843
Amortization																		59		65		66
Unrealized (gains) losses on derivatives, and other hedging activities																		(77)		(187)		56
Interest Expenses																		871		843		778
Income from Continuing Operations Before Income Taxes																		2,068		2,129		1,728
Income Taxes																		465		692		360
Deferred income taxes and investment tax credits	[2]																	428		666		387
Net income		399	[1]	393	[1]	(757)	[1],[3]	647	[1]	695	[1],[4]	497	[1]	229	[1]	316	[1]	682		1,737		1,130
Cash Flow [Abstract]
Expenditures for long-lived assets																		3,570		3,723		3,682
Balance Sheet Data
Assets		39,301								48,606								39,301		48,606
Kentucky Regulated [Member]
Income Statement Data
Revenues	[5]																	3,115		3,168		2,976
Depreciation																		382		354		334
Amortization	[6]																	27		25		22
Unrealized (gains) losses on derivatives, and other hedging activities	[7]																	11		12		12
Interest Expenses																		232		219		212
Income from Continuing Operations Before Income Taxes																		547		501		484
Income Taxes	[8]																	221		189		179
Deferred income taxes and investment tax credits	[2]																	236		449		254
Net income																		326		312		307
Cash Flow [Abstract]
Expenditures for long-lived assets																		1,210		1,262		1,434
Balance Sheet Data
Assets		13,756								13,022								13,756		13,022
United Kingdom Regulated [Member]
Income Statement Data
Revenues	[5]																	2,410		2,621		2,403
Depreciation																		242		337		300
Amortization	[6]																	6		17		19
Unrealized (gains) losses on derivatives, and other hedging activities	[7]																	(88)		(199)		44
Interest Expenses																		417		461		425
Income from Continuing Operations Before Income Taxes																		1,249		1,311		993
Income Taxes	[8]																	128		329		71
Deferred income taxes and investment tax credits	[2]																	45		94		(45)
Net income																		1,121		982		922
Cash Flow [Abstract]
Expenditures for long-lived assets																		1,242		1,438		1,280
Balance Sheet Data
Assets		16,669								15,944								16,669		15,944
Pennsylvania Regulated [Member]
Income Statement Data
Revenues	[5]																	2,124		2,044		1,870
Depreciation																		214		185		178
Amortization	[6]																	26		19		19
Interest Expenses																		130		122		108
Income from Continuing Operations Before Income Taxes																		416		423		317
Income Taxes	[8]																	164		160		108
Deferred income taxes and investment tax credits	[2]																	220		87		127
Net income																		252		263		209
Cash Flow [Abstract]
Expenditures for long-lived assets																		1,107		957		942
Balance Sheet Data
Assets		8,511								7,706								8,511		7,706
Corporate And Other [Member]
Income Statement Data
Revenues	[5]																	20		19		14
Depreciation																		45		47		31
Amortization	[6]																	0		4		6
Interest Expenses																		92		41		33
Income from Continuing Operations Before Income Taxes																		(144)	[9]	(106)	[9]	(66)
Income Taxes	[8]																	(48)	[9]	14	[9]	2
Deferred income taxes and investment tax credits	[2]																	(73)	[9]	36	[9]	51
Net income																		(96)	[9]	(120)	[9]	(68)
Cash Flow [Abstract]
Expenditures for long-lived assets																		11		66		26
Balance Sheet Data
Assets	[10]	365								909								365		909
Discontinued Operations [Member]
Income Statement Data
Net income	[11]																	(921)		300		(240)
Balance Sheet Data
Assets		0								11,025								$ 0		11,025
PPL Electric Utilities Corp [Member]
Segment Information (Numeric) [Abstract]
Number of operating segments | Integer																		2
Number of reportable segments | Integer																		1
Income Statement Data
Revenues		499	[12]	519	[12]	476	[12]	630	[12]	526	[12]	477	[12]	449	[12]	592	[12]	$ 2,124		2,044		1,870
Depreciation																		214		185		178
Amortization																		26		19		19
Interest Expenses																		130		122		108
Income from Continuing Operations Before Income Taxes																		416		423		317
Income Taxes																		164		160		108
Net income		61	[12]	$ 55	[12]	$ 49	[12]	$ 87	[12]	69	[12]	$ 57	[12]	$ 52	[12]	$ 85	[12]	252	[13]	263	[13]	209	[13]
Balance Sheet Data
Assets		8,511								7,706								$ 8,511		7,706
LG And E And KU Energy LLC [Member]
Segment Information (Numeric) [Abstract]
Number of reportable segments | Integer																		1
Income Statement Data
Revenues																		$ 3,115		3,168		2,976
Depreciation																		382		354		334
Amortization																		27		25		22
Interest Expenses																		178		167		144
Income from Continuing Operations Before Income Taxes																		603		553		551
Income Taxes																		239		209		206
Net income																		364		344		347
Balance Sheet Data
Assets		14,090								13,356								$ 14,090		13,356
Louisville Gas And Electric Co [Member]
Segment Information (Numeric) [Abstract]
Number of reportable segments | Integer																		1
Income Statement Data
Revenues																		$ 1,444		1,533		1,410
Depreciation																		162		157		148
Amortization																		11		12		6
Interest Expenses																		57		49		34
Income from Continuing Operations Before Income Taxes																		299		272		257
Income Taxes																		114		103		94
Net income	[14]																	185		169		163
Balance Sheet Data
Assets		6,068								5,654								$ 6,068		5,654
Kentucky Utilities Co [Member]
Segment Information (Numeric) [Abstract]
Number of reportable segments | Integer																		1
Income Statement Data
Revenues																		$ 1,728		1,737		1,635
Depreciation																		220		197		186
Amortization																		13		11		14
Interest Expenses																		82		77		70
Income from Continuing Operations Before Income Taxes																		374		355		360
Income Taxes																		140		135		132
Net income	[13]																	234		220		$ 228
Balance Sheet Data
Assets		$ 8,011								$ 7,701								$ 8,011		$ 7,701

[1] Quarterly results can vary depending on, among other things, weather . Accordingly, comparisons among quarters of a year may not be indicative of overall tr ends and changes in operations.

[2] Represents a non-cash expense item that is also incl uded in "Income Taxes.”

[3] The second quarter of 2015 includes a loss of $879 million from the spinoff of PPL Energy Supply. See Note 8 to the Financial Statements for additional information.

[4] (f) The fourth quarter of 2014 includes a gain of $137 million (after-tax) from the sale of Hydroelectric generating facilities of PPL Montana. See Note 8 for additional information.

[5] See Note 1 for additional information on Operating Revenues.

[6] Represents non-cash expense items that include amortization of regulatory assets, debt discounts and premiums, debt issuance costs, emission allowances and RECs.

[7] Includes unrealized gains and losses from economic activity. See Note 17 for additional information.

[8] Represents both current and deferred income taxes , including investment tax credits.

[9] 2015 and 2014 include certain costs related to the spinoff of PPL Energy Supply, including deferred income tax expense, transition cost s and separation benefits for PPL Services employees. See Note 8 for additional information.

[10] Primarily consists of unallocated items, including cash, PP&E and the elimination of inter-segment transactions.

[11] 2015 includes an $879 million loss on the spinoff of PPL Energy Supply and five months of Supply segment earnings. 2014 includes a gain of $237 million ($137 million after-tax) on the sale of the Montana hydroelectric gener ating facilities. 2013 includes a charge of $697 million ($413 million after-tax) for the termination of the lease of the Colstrip coal-fired electric generating facility. See Note 8 for additional information on these transactions.

[12] PPL Electric's business is seasonal in nature, with peak sales periods generally occurring in the winter and summer months. Accordingly, comparisons among quarters of a year may not be indicative of overall trends and changes in operations.

[13] Net income approximates comprehensive income.

[14] Net income equals comprehensive income.