Summary of Significant Accounting Policies (Details) $ / shares in Units, $ in Millions		3 Months Ended																12 Months Ended
		Dec. 31, 2016 USD ($) $ / shares		Sep. 30, 2016 USD ($) $ / shares		Jun. 30, 2016 USD ($) $ / shares		Mar. 31, 2016 USD ($) $ / shares		Dec. 31, 2015 USD ($) $ / shares		Sep. 30, 2015 USD ($) $ / shares		Jun. 30, 2015 USD ($) $ / shares		Mar. 31, 2015 USD ($) $ / shares		Dec. 31, 2016 USD ($) Integer $ / shares MW	Dec. 31, 2015 USD ($) $ / shares	Dec. 31, 2014 USD ($) $ / shares
Summary of Significant Accounting Policies [Line Items]
Income Taxes																		$ 648	$ 465	$ 692
Utility Revenue (Details) [Abstract]
Domestic electric and gas revenue	[1]																	5,297	5,239	5,209
U.K. operating revenues	[2]																	2,207	2,410	2,621
Domestic - other																		13	20	22
Operating Revenues		$ 1,832	[3]	$ 1,889	[3]	$ 1,785	[3]	$ 2,011	[3]	$ 1,780	[3]	$ 1,878	[3]	$ 1,781	[3]	$ 2,230	[3]	7,517	7,669	7,852
Restricted Cash and Cash Equivalents (Numeric) [Abstract]
Restricted cash and cash equivalents		26								33								26	33
Property, Plant and Equipment (Numeric) [Abstract]
Interest costs, capitalized during the period																		$ 11	11	$ 16
Defined Benefits [Abstract]
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization																		30.00%
The expected average remaining service of active plan participants																		50.00%
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis																		10.00%
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis																		30.00%
Discount Rate Change For United Kingdom Pension Plans Numeric [Abstract]
Decrease in net periodic defined benefit cost from change in the discount rate																		$ 43
Decrease in net periodic defined benefit cost from change in the discount rate, after-tax																		$ 34
Decrease in net periodic defined benefit cost from change in the discount rate, per share | $ / shares																		$ 0.05
Income Taxes [Abstract]
Minimum percentage to be attained of likelihood of uncertain tax position being realized																		50.00%
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		$ 356								$ 357								$ 356	$ 357
Balance Sheet Classification of Deferred Taxes [Abstract]
Basic (in dollars per share) | $ / shares		$ 0.68	[3],[4]	$ 0.70	[3],[4]	$ 0.71	[3],[4]	$ 0.71	[3],[4]	$ 0.59	[3],[4]	$ 0.58	[3],[4]	$ (1.13)	[3],[4]	$ 0.97	[3],[4]	$ 2.80	$ 1.01	$ 2.64
New Accounting Pronouncement Early Adoption [Member]
Summary of Significant Accounting Policies [Line Items]
Income Taxes																		$ 10
Balance Sheet Classification of Deferred Taxes [Abstract]
Basic (in dollars per share) | $ / shares																		$ 0.01
Cumulative Effect Initial Adoption Of New Accounting Principle																		$ 7
Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Regulatory Asset Amortization Period																		10 years
Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Regulatory Asset Amortization Period																		25 years
Fuel [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		$ 158								$ 168								$ 158	$ 168
Natural Gas Stored Underground [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet	[5]	42								42								42	42
Material And Supplies [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		156								147								$ 156	$ 147
Regulated Operations [Member] | Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted-average rates																		2.73%	2.57%	2.92%
Low Carbon Network Fund [Member]
Restricted Cash and Cash Equivalents (Numeric) [Abstract]
Restricted cash and cash equivalents	[6]	17								22								$ 17	$ 22
Other Restricted Cash [Member]
Restricted Cash and Cash Equivalents (Numeric) [Abstract]
Restricted cash and cash equivalents		9								11								9	11
Allowance For Doubtful Accounts [Member]
Allowance for Doubtful Accounts (Details) [Roll Forward]
Balance at beginning of period								$ 41								$ 44		41	44	$ 43
Additions charged to income																		44	49	49
Additions charged to other accounts																		0	(2)	0
Deductions	[7]																	31	50	48
Balance at end of period		54								41								54	41	44
Unaffiliated Third Party Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable																		$ 1,400	$ 1,300	1,100
WPD [Member]
Summary of Significant Accounting Policies [Line Items]
Period of lag in reporting results for WPD (in months) | Integer																		1
Revenue Recognition (Numeric) [Abstract]
Number of regulatory years later future demand revenue is affected																		2 years
Percentage WPD's distribution network operators are able to retain of any under-spends																		70.00%
Percentage WPD's distribution network operators bear of any over-spends																		70.00%
Refunded/recovered period of lag for recovery of over and under-recovered amounts arising from 2014/15 onwards																		2 years
Previous refunded/recovered period of lag for recovery of over and under-recovered amounts																		1 year
Balance Sheet Classification of Deferred Taxes [Abstract]
RIIO-ED1 Price Control Period																		8 years
WPD [Member] | Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted average useful life																		69 years	55 years
Decrease in depreciation expense from change in weighted average useful lives																			$ 84
Decrease in depreciation expense from change in weighted average useful lives, after-tax																			$ 66
Decrease in depreciation expense from change in weighted average useful lives, per share | $ / shares																			$ 0.10
PPL Electric Utilities Corp [Member]
Summary of Significant Accounting Policies [Line Items]
Regulatory Asset Liability Amortization Period																		5 years
Income Taxes																		$ 212	$ 164	160
Utility Revenue (Details) [Abstract]
Operating Revenues		537	[8]	$ 539	[8]	$ 495	[8]	585	[8]	499	[8]	$ 519	[8]	$ 476	[8]	630	[8]	2,156	2,124	$ 2,044
Restricted Cash and Cash Equivalents (Numeric) [Abstract]
Restricted cash and cash equivalents		2								2								$ 2	2
Defined Benefits [Abstract]
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization																		30.00%
The expected average remaining service of active plan participants																		50.00%
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis																		10.00%
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis																		30.00%
Income Taxes [Abstract]
Minimum percentage to be attained of likelihood of uncertain tax position being realized																		50.00%
Intercompany tax receivables (payables)		13								56								$ 13	$ 56
PPL Electric Utilities Corp [Member] | New Accounting Pronouncement Early Adoption [Member]
Summary of Significant Accounting Policies [Line Items]
Income Taxes																		$ 6
PPL Electric Utilities Corp [Member] | Regulated Operations [Member] | Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted-average rates																		2.63%	2.46%	2.46%
PPL Electric Utilities Corp [Member] | Low Carbon Network Fund [Member]
Restricted Cash and Cash Equivalents (Numeric) [Abstract]
Restricted cash and cash equivalents		0								0								$ 0	$ 0
PPL Electric Utilities Corp [Member] | Other Restricted Cash [Member]
Restricted Cash and Cash Equivalents (Numeric) [Abstract]
Restricted cash and cash equivalents		2								2								2	2
PPL Electric Utilities Corp [Member] | Allowance For Doubtful Accounts [Member]
Allowance for Doubtful Accounts (Details) [Roll Forward]
Balance at beginning of period								16								17		16	17	$ 18
Additions charged to income																		35	39	34
Additions charged to other accounts																		0	0	0
Deductions	[7]																	23	40	35
Balance at end of period		28								16								28	16	17
PPL Electric Utilities Corp [Member] | Unaffiliated Third Party Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable																		1,400	1,300	1,100
PPL Electric Utilities Corp [Member] | PPL EnergyPlus [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable																			146	336
LG And E And KU Energy LLC [Member]
Summary of Significant Accounting Policies [Line Items]
Income Taxes																		257	239	209
Utility Revenue (Details) [Abstract]
Operating Revenues																		$ 3,141	3,115	$ 3,168
Defined Benefits [Abstract]
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization																		30.00%
The expected average remaining service of active plan participants																		50.00%
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis																		10.00%
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis																		30.00%
Income Taxes [Abstract]
Minimum percentage to be attained of likelihood of uncertain tax position being realized																		50.00%
Intercompany tax receivables (payables)		1								(10)								$ 1	(10)
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		297								298								$ 297	298
LG And E And KU Energy LLC [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Regulatory Asset Amortization Period																		10 years
LG And E And KU Energy LLC [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Regulatory Asset Amortization Period																		25 years
LG And E And KU Energy LLC [Member] | Fuel [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		158								168								$ 158	168
LG And E And KU Energy LLC [Member] | Natural Gas Stored Underground [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet	[5]	42								42								42	42
LG And E And KU Energy LLC [Member] | Material And Supplies [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		97								88								$ 97	$ 88
LG And E And KU Energy LLC [Member] | Regulated Operations [Member] | Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted-average rates																		3.69%	3.69%	3.80%
LG And E And KU Energy LLC [Member] | Ohio Valley Electric Corporation [Member]
Cost Method Investments [Abstract]
Number of electric utilities that are equity owners | Integer																		10
Number of companies power is supplied to | Integer																		11
LG And E And KU Energy LLC [Member] | Allowance For Doubtful Accounts [Member]
Allowance for Doubtful Accounts (Details) [Roll Forward]
Balance at beginning of period								23								25		$ 23	$ 25	$ 22
Additions charged to income																		8	9	14
Additions charged to other accounts																		0	(2)	0
Deductions	[7]																	7	9	11
Balance at end of period		24								23								$ 24	23	25
LG And E And KU Energy LLC [Member] | LGE [Member] | Ohio Valley Electric Corporation [Member]
Cost Method Investments [Abstract]
Ownership percentage																		5.63%
Generation capacity in terms of ownership percentage (in MW) | MW																		120
LG And E And KU Energy LLC [Member] | KU [Member] | Ohio Valley Electric Corporation [Member]
Cost Method Investments [Abstract]
Ownership percentage																		2.50%
Generation capacity in terms of ownership percentage (in MW) | MW																		53
Louisville Gas And Electric Co [Member]
Summary of Significant Accounting Policies [Line Items]
Income Taxes																		$ 126	114	103
Utility Revenue (Details) [Abstract]
Operating Revenues																		$ 1,430	1,444	$ 1,533
Defined Benefits [Abstract]
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization																		30.00%
The expected average remaining service of active plan participants																		50.00%
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis																		10.00%
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis																		30.00%
Income Taxes [Abstract]
Minimum percentage to be attained of likelihood of uncertain tax position being realized																		50.00%
Intercompany tax receivables (payables)		(18)								4								$ (18)	4
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		143								151								$ 143	151
Louisville Gas And Electric Co [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Regulatory Asset Amortization Period																		10 years
Louisville Gas And Electric Co [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Regulatory Asset Amortization Period																		25 years
Louisville Gas And Electric Co [Member] | Fuel [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		60								71								$ 60	71
Louisville Gas And Electric Co [Member] | Natural Gas Stored Underground [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet	[5]	42								42								42	42
Louisville Gas And Electric Co [Member] | Material And Supplies [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		41								38								$ 41	$ 38
Louisville Gas And Electric Co [Member] | Regulated Operations [Member] | Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted-average rates																		3.58%	3.65%	4.05%
Louisville Gas And Electric Co [Member] | Ohio Valley Electric Corporation [Member]
Cost Method Investments [Abstract]
Number of electric utilities that are equity owners | Integer																		10
Number of companies power is supplied to | Integer																		11
Ownership percentage																		5.63%
Generation capacity in terms of ownership percentage (in MW) | MW																		120
Louisville Gas And Electric Co [Member] | Allowance For Doubtful Accounts [Member]
Allowance for Doubtful Accounts (Details) [Roll Forward]
Balance at beginning of period								1								2		$ 1	$ 2	$ 2
Additions charged to income																		2	2	5
Additions charged to other accounts																		1	0	(1)
Deductions	[7]																	2	3	4
Balance at end of period		2								1								2	1	2
Kentucky Utilities Co [Member]
Summary of Significant Accounting Policies [Line Items]
Income Taxes																		163	140	135
Utility Revenue (Details) [Abstract]
Operating Revenues																		$ 1,749	1,728	$ 1,737
Defined Benefits [Abstract]
Percentage in excess of gains and losses equal to the plan's projected benefit obligation to use accelerated amortization																		30.00%
The expected average remaining service of active plan participants																		50.00%
Minimum percentage of gains and losses under the accelerated method that are amortized on a straight line basis																		10.00%
Maximum percentage of gains and losses under the accelerated that are amortized on a straight line basis																		30.00%
Income Taxes [Abstract]
Minimum percentage to be attained of likelihood of uncertain tax position being realized																		50.00%
Intercompany tax receivables (payables)		(29)								(5)								$ (29)	(5)
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		154								147								$ 154	147
Kentucky Utilities Co [Member] | Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Regulatory Asset Amortization Period																		10 years
Kentucky Utilities Co [Member] | Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Regulatory Asset Amortization Period																		25 years
Kentucky Utilities Co [Member] | Fuel [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		98								97								$ 98	97
Kentucky Utilities Co [Member] | Natural Gas Stored Underground [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		0								0								0	0
Kentucky Utilities Co [Member] | Material And Supplies [Member]
Fuel, Materials and Supplies (Details) [Abstract]
Fuel, materials and supplies on the Balance Sheet		56								50								$ 56	$ 50
Kentucky Utilities Co [Member] | Regulated Operations [Member] | Utility Plant [Member]
Depreciation (Details) [Abstract]
Weighted-average rates																		3.77%	3.71%	3.63%
Kentucky Utilities Co [Member] | Ohio Valley Electric Corporation [Member]
Cost Method Investments [Abstract]
Number of electric utilities that are equity owners | Integer																		10
Number of companies power is supplied to | Integer																		11
Ownership percentage																		2.50%
Generation capacity in terms of ownership percentage (in MW) | MW																		53
Kentucky Utilities Co [Member] | Allowance For Doubtful Accounts [Member]
Allowance for Doubtful Accounts (Details) [Roll Forward]
Balance at beginning of period								$ 2								$ 2		$ 2	$ 2	$ 4
Additions charged to income																		4	5	8
Additions charged to other accounts																		0	0	(3)
Deductions	[7]																	4	5	7
Balance at end of period		$ 2								$ 2								$ 2	$ 2	$ 2

[1] Represents revenues from cost-based rate-regulated generation, transmission and/or distribution in Pennsylvania, Kentucky, Virginia and Tennessee, including regulated wholesale revenue.

[2] Primarily represents regulated electricity distribution revenues from the operation of WPD's distribution networks.

[3] 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.

[4] The sum of the quarterly amounts may not equal annual earnings per share due to changes in the number of common shares outstanding during the year or rounding.

[5] Natural gas stored underground is primarily held to serve retail customers.

[6] Funds received by WPD, which are to be spent on approved initiatives to support a low carbon environment.

[7] Primarily related to uncollectible accounts written off.

[8] 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.