Retirement and Postemployment Benefits (Weighted-Average Assumptions, Cost Trend Rates and Funded Status) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Pension Benefits United States [Member]
Weighted Average Assumptions Used in the Valuation of the Benefit Obligations (Details) [Abstract]
Benefit obligations valuation discount rate		4.21%	4.59%
Benefit obligations valuation rate of compensation increase		3.95%	3.93%
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Costs (Details) [Abstract]
Net periodic benefit costs discount rate - service cost		4.59%	4.25%		5.12%
Net periodic benefit costs discount rate - interest cost		4.59%	4.25%		5.12%
Net periodic benefit costs rate of compensation increase		3.93%	3.91%		3.97%
Net periodic benefit costs expected return on plan assets	[1]	7.00%	7.00%		7.00%
Assumed Health Care Cost Trend Rates (Details) [Abstract]
Health care cost trend rate assumed for next year, obligations		7.00%	6.80%		7.20%
Health care cost trend rate assumed for next year, cost		6.80%	7.20%		7.60%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate), obligations		5.00%	5.00%		5.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate),cost		5.00%	5.00%		5.00%
Year that the rate reaches the ultimate trend rate, obligations		2022	2020		2020
Year that the rate reaches the ultimate trend rate, cost		2020	2020		2020
Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of period		$ 3,863	$ 5,399
Service cost		66	96		$ 97
Interest cost		174	194		224
Plan Amendments		14	19
Participant contributions		0	0
Actuarial (gain) loss		214	(193)
Divestiture		0	(1,416)	[2]
Settlements		(9)	0
Gross benefits paid		(243)	(236)
Federal subsidy		0	0
Currency conversion		0	0
Benefit Obligation, end of period		4,079	3,863		5,399
Change in Plan Assets [Roll Forward]
Balance at beginning of period		3,227	4,462
Actual return on plan assets		189	2
Employer contributions		79	158
Participant contributions		0	0
Divestiture		0	(1,159)	[2]
Settlements		9	0
Gross benefits paid		(243)	(236)
Currency conversion		0	0
Balance at end of period		3,243	3,227		$ 4,462
Funded Status, end of period		(836)	(636)
Amounts recognized in the Balance Sheets consist of: [Abstract]
Noncurrent asset		0	0
Current liability		(17)	(10)
Noncurrent liability		(819)	(626)
Net amount recognized, end of period		(836)	(636)
Amounts recognized in AOCI and regulatory assets/liabilities (pre-tax): [Abstract]
Prior service cost (credit)		59	53
Net actuarial (gain) loss		1,178	977
Total	[3]	1,237	1,030
Total accumulated benefit obligation for defined benefit pension plans		3,807	3,590
Changes in Plan Assets and Benefit Obligations Recognized in AOCI and Regulatory Assets/Liabilities by Type (Details) [Abstract]
AOCI		357	275
Regulatory assets/liabilities		880	755
Total	[3]	1,237	1,030
Pension Plans Where the Projected or Accumulated Benefit Obligation Exceed the Fair Value of Plan Assets (Details) [Abstract]
Projected benefit obligations		4,079	3,863
Fair value of plan assets where the projected benefit obligations exceed the value of plan assets		3,243	3,227
Accumulated benefit obligation		3,807	3,590
Fair value of plan assets where the accumulated benefit obligations exceed the value of plan assets		$ 3,243	$ 3,227
Pension Benefits United Kingdom [Member]
Weighted Average Assumptions Used in the Valuation of the Benefit Obligations (Details) [Abstract]
Benefit obligations valuation discount rate		2.87%	3.68%
Benefit obligations valuation rate of compensation increase		3.50%	4.00%
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Costs (Details) [Abstract]
Net periodic benefit costs discount rate - service cost		3.90%	3.85%		4.41%
Net periodic benefit costs discount rate - interest cost		3.14%	3.85%		4.41%
Net periodic benefit costs rate of compensation increase		4.00%	4.00%		4.00%
Net periodic benefit costs expected return on plan assets	[1]	7.20%	7.19%		7.19%
Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of period		$ 8,404	$ 8,523
Service cost		69	79		$ 71
Interest cost		235	314		354
Plan Amendments		0	0
Participant contributions		14	15
Actuarial (gain) loss		484	200
Divestiture		0	0
Settlements		0	0
Gross benefits paid		(357)	(391)
Federal subsidy		0	0
Currency conversion		(1,466)	(336)
Benefit Obligation, end of period		7,383	8,404		8,523
Change in Plan Assets [Roll Forward]
Balance at beginning of period		7,625	7,734
Actual return on plan assets		979	205
Employer contributions		330	366
Participant contributions		14	15
Divestiture		0	0
Settlements		0	0
Gross benefits paid		(357)	(391)
Currency conversion		(1,380)	(304)
Balance at end of period		7,211	7,625		$ 7,734
Funded Status, end of period		(172)	(779)
Amounts recognized in the Balance Sheets consist of: [Abstract]
Noncurrent asset		10	0
Current liability		0	0
Noncurrent liability		(182)	(779)
Net amount recognized, end of period		(172)	(779)
Amounts recognized in AOCI and regulatory assets/liabilities (pre-tax): [Abstract]
Prior service cost (credit)		0	0
Net actuarial (gain) loss		2,553	2,684
Total	[3]	2,553	2,684
Total accumulated benefit obligation for defined benefit pension plans		6,780	7,747
Changes in Plan Assets and Benefit Obligations Recognized in AOCI and Regulatory Assets/Liabilities by Type (Details) [Abstract]
Total	[3]	2,553	2,684
Pension Plans Where the Projected or Accumulated Benefit Obligation Exceed the Fair Value of Plan Assets (Details) [Abstract]
Projected benefit obligations		3,403	8,404
Fair value of plan assets where the projected benefit obligations exceed the value of plan assets		3,221	7,625
Accumulated benefit obligation		657	3,532
Fair value of plan assets where the accumulated benefit obligations exceed the value of plan assets		$ 643	$ 3,287
Other Postretirement Benefits United States [Member]
Weighted Average Assumptions Used in the Valuation of the Benefit Obligations (Details) [Abstract]
Benefit obligations valuation discount rate		4.11%	4.48%
Benefit obligations valuation rate of compensation increase		3.92%	3.91%
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Costs (Details) [Abstract]
Net periodic benefit costs discount rate - service cost		4.48%	4.09%		4.91%
Net periodic benefit costs discount rate - interest cost		4.48%	4.09%		4.91%
Net periodic benefit costs rate of compensation increase		3.91%	3.86%		3.96%
Net periodic benefit costs expected return on plan assets	[1]	6.11%	6.06%		5.96%
Effect of One Percentage Point Change in Assumed Health Care Costs Trend Rate (Details) [Abstract]
Effect on accumulated postretirement benefit obligation of a one percentage point increase		$ 5
Effect on accumulated postretirement benefit obligation of a one percentage point decrease		(5)
Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of period		596	$ 716
Service cost		7	11		$ 12
Interest cost		26	26		31
Plan Amendments		0	0
Participant contributions		14	13
Actuarial (gain) loss		11	(37)
Divestiture		0	(76)	[2]
Settlements		0	0
Gross benefits paid		(64)	(58)
Federal subsidy		1	1
Currency conversion		0	0
Benefit Obligation, end of period		591	596		716
Change in Plan Assets [Roll Forward]
Balance at beginning of period		379	484
Actual return on plan assets		25	(2)
Employer contributions		19	17
Participant contributions		14	13
Divestiture		0	(80)	[2]
Settlements		0	0
Gross benefits paid		(59)	(53)
Currency conversion		0	0
Balance at end of period		378	379		$ 484
Funded Status, end of period		(213)	(217)
Amounts recognized in the Balance Sheets consist of: [Abstract]
Noncurrent asset		2	2
Current liability		(3)	(3)
Noncurrent liability		(212)	(216)
Net amount recognized, end of period		(213)	(217)
Amounts recognized in AOCI and regulatory assets/liabilities (pre-tax): [Abstract]
Prior service cost (credit)		0	1
Net actuarial (gain) loss		45	37
Total	[3]	45	38
Changes in Plan Assets and Benefit Obligations Recognized in AOCI and Regulatory Assets/Liabilities by Type (Details) [Abstract]
AOCI		20	18
Regulatory assets/liabilities		25	20
Total	[3]	45	38
PPL Electric Utilities Corp [Member]
Change in Plan Assets [Roll Forward]
Non-cash contributions related to remeasurement and separation of benefit plans			56
PPL Electric Utilities Corp [Member] | Pension Benefits United States [Member] | PPL Services Funded Status Allocation [Member]
Change in Plan Assets [Roll Forward]
Funded Status, end of period		281	183
Non-cash contributions related to remeasurement and separation of benefit plans			56
PPL Electric Utilities Corp [Member] | Other Postretirement Benefits United States [Member] | PPL Services Funded Status Allocation [Member]
Change in Plan Assets [Roll Forward]
Funded Status, end of period		$ 72	$ 67
LG And E And KU Energy LLC [Member] | Pension Benefits United States [Member]
Weighted Average Assumptions Used in the Valuation of the Benefit Obligations (Details) [Abstract]
Benefit obligations valuation discount rate		4.19%	4.56%
Benefit obligations valuation rate of compensation increase		3.50%	3.50%
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Costs (Details) [Abstract]
Net periodic benefit costs discount rate		4.56%	4.25%		5.18%
Net periodic benefit costs rate of compensation increase		3.50%	3.50%		4.00%
Net periodic benefit costs expected return on plan assets	[1]	7.00%	7.00%		7.00%
Assumed Health Care Cost Trend Rates (Details) [Abstract]
Health care cost trend rate assumed for next year, obligations		7.00%	6.80%		7.20%
Health care cost trend rate assumed for next year, cost		6.80%	7.20%		7.60%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate), obligations		5.00%	5.00%		5.00%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate),cost		5.00%	5.00%		5.00%
Year that the rate reaches the ultimate trend rate, obligations		2020	2020		2020
Year that the rate reaches the ultimate trend rate, cost		2020	2020		2020
Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of period		$ 1,588	$ 1,608
Service cost		23	26		$ 21
Interest cost		71	68		66
Plan Amendments		0	19	[4]
Participant contributions		0	0
Actuarial (gain) loss		96	(74)
Gross benefits paid	[4]	(109)	(59)
Federal subsidy		0	0
Benefit Obligation, end of period		1,669	1,588		1,608
Increase during the period resulting from a plan amendment			19
Defined Benefit Plan One Time Cash Payouts To Terminated Vested Employees		53
Change in Plan Assets [Roll Forward]
Balance at beginning of period		1,289	1,301
Actual return on plan assets		69	(7)
Employer contributions		66	54
Participant contributions		0	0
Gross benefits paid		(109)	(59)
Balance at end of period		1,315	1,289		$ 1,301
Funded Status, end of period		(354)	(299)
Amounts recognized in the Balance Sheets consist of: [Abstract]
Noncurrent asset		0	0
Current liability		(4)	(3)
Noncurrent liability		(350)	(296)
Net amount recognized, end of period		(354)	(299)
Amounts recognized in AOCI and regulatory assets/liabilities (pre-tax): [Abstract]
Prior service cost (credit)		45	54
Net actuarial (gain) loss		436	338
Total		481	392
Total accumulated benefit obligation for defined benefit pension plans		1,531	1,452
Changes in Plan Assets and Benefit Obligations Recognized in AOCI and Regulatory Assets/Liabilities by Type (Details) [Abstract]
AOCI		111	70
Regulatory assets/liabilities		370	322
Total		481	392
Pension Plans Where the Projected or Accumulated Benefit Obligation Exceed the Fair Value of Plan Assets (Details) [Abstract]
Projected benefit obligations		1,669	1,588
Fair value of plan assets where the projected benefit obligations exceed the value of plan assets		1,315	1,289
Accumulated benefit obligation		1,531	1,452
Fair value of plan assets where the accumulated benefit obligations exceed the value of plan assets		$ 1,315	$ 1,289
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits United States [Member]
Weighted Average Assumptions Used in the Valuation of the Benefit Obligations (Details) [Abstract]
Benefit obligations valuation discount rate		4.12%	4.49%
Benefit obligations valuation rate of compensation increase		3.50%	3.50%
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Costs (Details) [Abstract]
Net periodic benefit costs discount rate		4.49%	4.06%		4.91%
Net periodic benefit costs rate of compensation increase		3.50%	3.50%		4.00%
Net periodic benefit costs expected return on plan assets	[1]	6.82%	6.82%		6.75%
Effect of One Percentage Point Change in Assumed Health Care Costs Trend Rate (Details) [Abstract]
Effect on accumulated postretirement benefit obligation of a one percentage point increase		$ 4
Effect on accumulated postretirement benefit obligation of a one percentage point decrease		(4)
Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of period		216	$ 234
Service cost		5	5		$ 4
Interest cost		9	9		9
Plan Amendments		0	0
Participant contributions		7	7
Actuarial (gain) loss		4	(22)
Gross benefits paid	[4]	(21)	(18)
Federal subsidy		0	1
Benefit Obligation, end of period		220	216		234
Change in Plan Assets [Roll Forward]
Balance at beginning of period		88	82
Actual return on plan assets		4	0
Employer contributions		20	17
Participant contributions		7	7
Gross benefits paid		(21)	(18)
Balance at end of period		98	88		$ 82
Funded Status, end of period		(122)	(128)
Amounts recognized in the Balance Sheets consist of: [Abstract]
Noncurrent asset		2	2
Current liability		(3)	(3)
Noncurrent liability		(121)	(127)
Net amount recognized, end of period		(122)	(128)
Amounts recognized in AOCI and regulatory assets/liabilities (pre-tax): [Abstract]
Prior service cost (credit)		6	9
Net actuarial (gain) loss		(13)	(19)
Total		(7)	(10)
Changes in Plan Assets and Benefit Obligations Recognized in AOCI and Regulatory Assets/Liabilities by Type (Details) [Abstract]
AOCI		8	7
Regulatory assets/liabilities		(15)	(17)
Total		$ (7)	$ (10)
Louisville Gas And Electric Co [Member] | Pension Benefits United States [Member]
Weighted Average Assumptions Used in the Valuation of the Benefit Obligations (Details) [Abstract]
Benefit obligations valuation discount rate		4.13%	4.49%
Weighted Average Assumptions Used to Determine the Net Periodic Benefit Costs (Details) [Abstract]
Net periodic benefit costs discount rate		4.49%	4.20%		5.13%
Net periodic benefit costs expected return on plan assets	[1]	7.00%	7.00%		7.00%
Change in Benefit Obligation [Roll Forward]
Benefit Obligation, beginning of period		$ 326	$ 331
Service cost		1	1		$ 1
Interest cost		15	14		15
Plan Amendments		0	10	[5]
Actuarial (gain) loss		15	(15)
Gross benefits paid	[5]	(28)	(15)
Benefit Obligation, end of period		329	326		331
Increase during the period resulting from a plan amendment			10
Defined Benefit Plan One Time Cash Payouts To Terminated Vested Employees		14
Change in Plan Assets [Roll Forward]
Balance at beginning of period		297	301
Actual return on plan assets		14	(2)
Employer contributions		35	13
Gross benefits paid		(28)	(15)
Balance at end of period		318	297		$ 301
Funded Status, end of period		(11)	(29)
Amounts recognized in the Balance Sheets consist of: [Abstract]
Noncurrent liability		(11)	(29)
Net amount recognized, end of period		(11)	(29)
Amounts recognized in AOCI and regulatory assets/liabilities (pre-tax): [Abstract]
Prior service cost (credit)		25	29
Net actuarial (gain) loss		110	95
Total		135	124
Total accumulated benefit obligation for defined benefit pension plans		329	326
Changes in Plan Assets and Benefit Obligations Recognized in AOCI and Regulatory Assets/Liabilities by Type (Details) [Abstract]
Total		135	124
Louisville Gas And Electric Co [Member] | Pension Benefits United States [Member] | LKE Funded Status Allocation [Member]
Change in Plan Assets [Roll Forward]
Funded Status, end of period		42	26
Louisville Gas And Electric Co [Member] | Other Postretirement Benefits United States [Member] | LKE Funded Status Allocation [Member]
Change in Plan Assets [Roll Forward]
Funded Status, end of period		76	77
Kentucky Utilities Co [Member] | Pension Benefits United States [Member] | LKE Funded Status Allocation [Member]
Change in Plan Assets [Roll Forward]
Funded Status, end of period		62	46
Kentucky Utilities Co [Member] | Other Postretirement Benefits United States [Member] | LKE Funded Status Allocation [Member]
Change in Plan Assets [Roll Forward]
Funded Status, end of period		$ 40	$ 42

[1] The expected long-term rates of return for pension and other postretirement benefits are based on management's projections using a best-estimate of expected returns, volatilities and correlations for each asset class. Each plan's specific current and expected asset allocations are also considered in developing a reasonable return assumption.

[2] As a result of the spinoff of PPL Energy Supply, obligations and assets attributable to certain former active and inactive employees of PPL Energy Supply were transferred to Talen Energy plans.

[3] WPD is not subject to accounting for the effects of certain types of regulation as prescribed by GAAP and as a result, does not record regulatory assets/liabilities.

[4] The pension plans were amended in December 2015 to allow active participants and terminated vested participants who had not previously elected a form of payment of their benefit to elect to receive their accrued pension benefit as a one-time lump-sum payment effective January 1, 2016. The projected benefit obligation at December 31, 2015 increased by $19 million as a result of the amendment. Gross benefits paid by the plans include $53 million of lump-sum cash payments made to participants during 2016 in connection with these offerings.

[5] The pension plan was amended in December 2015 to allow active participants and terminated vested participants who had not previously elected a form of payment of their benefit to elect to receive their accrued pension benefit as a one-time lump-sum payment effective January 1, 2016. The projected benefit obligation at December 31, 2015 increased by $10 million as a result of the amendment. Gross benefits paid by the plan include $14 million of lump-sum cash payments made to the participants during 2016 in connection with this offering.