Segment and Related Information (Income Statement and Balance Sheet Data) (Details) $ in Millions		3 Months Ended																12 Months Ended
		Dec. 31, 2016 USD ($)		Sep. 30, 2016 USD ($)		Jun. 30, 2016 USD ($)		Mar. 31, 2016 USD ($)		Dec. 31, 2015 USD ($)		Sep. 30, 2015 USD ($)		Jun. 30, 2015 USD ($)		Mar. 31, 2015 USD ($)		Dec. 31, 2016 USD ($) Integer		Dec. 31, 2015 USD ($)		Dec. 31, 2014 USD ($)
Income Statement Data
Operating Revenues from external customers		$ 1,832	[1]	$ 1,889	[1]	$ 1,785	[1]	$ 2,011	[1]	$ 1,780	[1]	$ 1,878	[1]	$ 1,781	[1]	$ 2,230	[1]	$ 7,517		$ 7,669		$ 7,852
Depreciation																		926		883		923
Amortization																		80		59		65
Unrealized (gains) losses on derivatives and other hedging activities																		19		(77)		(187)
Interest Expense																		888		871		843
Income from Continuing Operations Before Income Taxes																		2,550		2,068		2,129
Income Taxes																		648		465		692
Deferred income taxes and investment tax credits																		560		428		666
Net income		465	[1]	473	[1]	483	[1]	481	[1]	399	[1]	393	[1]	(757)	[1],[2]	647	[1]	1,902		682		1,737
Income (Loss) from Discontinued Operations (net of income taxes)										(6)	[1],[3],[4]	(3)	[1],[3],[4]	(1,007)	[1],[3],[4]	95	[1],[3],[4]	0		(921)		300
Cash Flow Data
Expenditures for long-lived assets																		2,957		3,570		3,723
Balance Sheet Data
Total Assets		38,315								39,301								$ 38,315		39,301
Segment Information (Numeric) [Abstract]
Number of reportable segments | Integer																		3
PPL Energy Supply Spinoff [Member]
Income Statement Data
Deferred income taxes and investment tax credits																						50
Income (Loss) from Discontinued Operations (net of income taxes)																				(921)		300
Gain (loss) on disposal group														(879)						(879)		0
Gain on sale of Montana																				0		237
Montana Hydroelectric Generating Facilities [Member]
Income Statement Data
Gain (loss) on disposal group																						137
Gain on sale of Montana																						237
U.K. Regulated [Member]
Income Statement Data
Operating Revenues from external customers	[5]																	$ 2,207		2,410		2,621
Depreciation																		233		242		337
Amortization	[6]																	16		6		17
Unrealized (gains) losses on derivatives and other hedging activities	[7]																	13		(88)		(199)
Interest Expense																		402		417		461
Income from Continuing Operations Before Income Taxes																		1,479		1,249		1,311
Income Taxes	[8]																	233		128		329
Deferred income taxes and investment tax credits	[9]																	31		45		94
Net income																		1,246		1,121		982
Cash Flow Data
Expenditures for long-lived assets																		1,031		1,242		1,438
Balance Sheet Data
Total Assets	[10]	14,537								16,669								14,537		16,669
Segment Information (Numeric) [Abstract]
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation		10,800								12,200								10,800		12,200
Kentucky Regulated [Member]
Income Statement Data
Operating Revenues from external customers	[5]																	3,141		3,115		3,168
Depreciation																		404		382		354
Amortization	[6]																	29		27		25
Unrealized (gains) losses on derivatives and other hedging activities	[7]																	6		11		12
Interest Expense																		260		232		219
Income from Continuing Operations Before Income Taxes																		640		547		501
Income Taxes	[8]																	242		221		189
Deferred income taxes and investment tax credits	[9]																	291		236		449
Net income																		398		326		312
Cash Flow Data
Expenditures for long-lived assets																		791		1,210		1,262
Balance Sheet Data
Total Assets		14,037								13,756								14,037		13,756
Pennsylvania Regulated [Member]
Income Statement Data
Operating Revenues from external customers	[5]																	2,156		2,124		2,044
Depreciation																		253		214		185
Amortization	[6]																	32		26		19
Interest Expense																		129		130		122
Income from Continuing Operations Before Income Taxes																		550		416		423
Income Taxes	[8]																	212		164		160
Deferred income taxes and investment tax credits	[9]																	221		220		87
Net income																		338		252		263
Cash Flow Data
Expenditures for long-lived assets																		1,134		1,107		957
Balance Sheet Data
Total Assets		9,426								8,511								9,426		8,511
Corporate And Other [Member]
Income Statement Data
Operating Revenues from external customers																		13		20		19	[5]
Depreciation																		36		45		47
Amortization	[6]																	3		0		4
Interest Expense																		97		92		41
Income from Continuing Operations Before Income Taxes																		(119)		(144)	[11]	(106)	[11]
Income Taxes	[8]																	(39)		(48)	[11]	14	[11]
Deferred income taxes and investment tax credits	[9]																	17		(73)	[11]	36	[11]
Net income																		(80)		(96)	[11]	(120)	[11]
Cash Flow Data
Expenditures for long-lived assets																		1		11		66
Balance Sheet Data
Total Assets	[12]	315								365								315		365
Discontinued Operations [Member]
Income Statement Data
Income (Loss) from Discontinued Operations (net of income taxes)																		0		(921)	[13]	300	[13]
PPL Electric Utilities Corp [Member]
Income Statement Data
Operating Revenues from external customers		537	[14]	539	[14]	495	[14]	585	[14]	499	[14]	519	[14]	476	[14]	630	[14]	2,156		2,124		2,044
Depreciation																		253		214		185
Amortization																		32		26		19
Interest Expense																		129		130		122
Income from Continuing Operations Before Income Taxes																		552		416		423
Income Taxes																		212		164		160
Deferred income taxes and investment tax credits																		221		220		87
Net income		77	[14]	$ 90	[14]	$ 79	[14]	$ 94	[14]	61	[14]	$ 55	[14]	$ 49	[14]	$ 87	[14]	340	[15]	252	[15]	263	[15]
Balance Sheet Data
Total Assets		9,426								8,511								$ 9,426		8,511
Segment Information (Numeric) [Abstract]
Number of operating segments | Integer																		2
Number of reportable segments | Integer																		1
LG And E And KU Energy LLC [Member]
Income Statement Data
Operating Revenues from external customers																		$ 3,141		3,115		3,168
Depreciation																		404		382		354
Amortization																		29		27		25
Interest Expense																		197		178		167
Income from Continuing Operations Before Income Taxes																		686		603		553
Income Taxes																		257		239		209
Deferred income taxes and investment tax credits																		291		236		449
Net income																		429		364		344
Balance Sheet Data
Total Assets		14,371								14,090								$ 14,371		14,090
Segment Information (Numeric) [Abstract]
Number of reportable segments | Integer																		1
Louisville Gas And Electric Co [Member]
Income Statement Data
Operating Revenues from external customers																		$ 1,430		1,444		1,533
Depreciation																		170		162		157
Amortization																		14		11		12
Interest Expense																		71		57		49
Income from Continuing Operations Before Income Taxes																		329		299		272
Income Taxes																		126		114		103
Deferred income taxes and investment tax credits																		147		126		118
Net income	[16]																	203		185		169
Balance Sheet Data
Total Assets		6,300								6,068								$ 6,300		6,068
Segment Information (Numeric) [Abstract]
Number of reportable segments | Integer																		1
Kentucky Utilities Co [Member]
Income Statement Data
Operating Revenues from external customers																		$ 1,749		1,728		1,737
Depreciation																		234		220		197
Amortization																		14		13		11
Interest Expense																		96		82		77
Income from Continuing Operations Before Income Taxes																		428		374		355
Income Taxes																		163		140		135
Deferred income taxes and investment tax credits																		126		160		224
Net income	[17]																	265		234		$ 220
Balance Sheet Data
Total Assets		$ 8,085								$ 8,011								$ 8,085		$ 8,011
Segment Information (Numeric) [Abstract]
Number of reportable segments | Integer																		1

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

[2] 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.

[3] In the second quarter of 2015, PPL completed the spinoff of PPL Energy Supply substantially representing PPL's Supply segment. Accordingly, the previously reported operating results for PPL's Supply segment have been reclassified as discontinued operations. See Note 8 to the Financial Statements for additional information.

[4] PPL has paid quarterly cash dividends on its common stock in every year since 1946. Future dividends, declared at the discretion of the Board of Directors, will be dependent upon future earnings, cash flows, financial requirements and other factors.

[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] Represents a non-cash expense item that is also included in "Income Taxes."

[10] Includes $10.8 billion and $12.2 billion of net PP&E as of December 31, 2016 and December 31, 2015. WPD is not subject to accounting for the effects of certain types of regulation as prescribed by GAAP.

[11] 2015 and 2014 include certain costs related to the spinoff of PPL Energy Supply, including deferred income tax expense, transition costs and separation benefits for PPL Services employees. See Note 8 for additional information.

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

[13] 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 generating facilities. See Note 8 for additional information on these transactions.

[14] 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.

[15] Net income equals comprehensive income.

[16] Net income equals comprehensive income.

[17] Net income approximates comprehensive income.