Retirement and Postemployment Benefits (Tables)

12 Months Ended

Dec. 31, 2019

Defined Benefit Plan Disclosure [Line Items]

Schedule Of Net Periodic Defined Benefit Costs (Credits)

The following table provides the components of net periodic defined benefit costs (credits) for PPL's domestic (U.S.) and WPD's (U.K.) pension and other postretirement benefit plans for the years ended December 31.

	Pension Benefits
	U.S.									U.K.									Other Postretirement Benefits
	2019			2018			2017			2019			2018			2017			2019			2018			2017
Net periodic defined benefit costs (credits):
Service cost	$	50		$	62		$	65		$	68		$	82		$	76		$	6		$	7		$	7
Interest cost	164			156			168			187			185			178			22			21			23
Expected return on plan assets	(245		)	(249		)	(231		)	(588		)	(587		)	(514		)	(18		)	(23		)	(22		)
Amortization of:
Prior service cost (credit)	8			10			10			1			—			—			(1		)	(1		)	(1		)
Actuarial (gain) loss	56			84			69			92			151			144			1			—			1
Net periodic defined benefit costs (credits) prior to settlements and termination benefits	33			63			81			(240		)	(169		)	(116		)	10			4			8
Settlements	1			—			1			—			—			—			—			—			—
Termination benefits	—			—			1			—			—			—			—			—			—
Net periodic defined benefit costs (credits)	$	34		$	63		$	83		$	(240	)	$	(169	)	$	(116	)	$	10		$	4		$	8
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross:
Settlement	(1		)	—			(1		)	—			—			—			—			—			—
Net (gain) loss	(121		)	157			27			723			201			346			(18		)	8			(28		)
Prior service cost (credit)	2			1			(1		)	—			13			—			—			—			8
Amortization of:
Prior service (cost) credit	(8		)	(10		)	(10		)	(1		)	—			—			1			1			1
Actuarial gain (loss)	(56		)	(84		)	(69		)	(92		)	(151		)	(144		)	(1		)	—			(1		)
Total recognized in OCI and regulatory assets/liabilities (a)	(184		)	64			(54		)	630			63			202			(18		)	9			(20		)
Total recognized in net periodic defined benefit costs, OCI and regulatory assets/liabilities (a)	$	(150	)	$	127		$	29		$	390		$	(106	)	$	86		$	(8	)	$	13		$	(12	)

(a)

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

Schedule of Amounts Recognized in Other Comprehensive Income and Regulatory Assets and Liabilities

For PPL's U.S. pension benefits and for other postretirement benefits, the amounts recognized in OCI and regulatory assets/liabilities for the years ended December 31 were as follows:

	U.S. Pension Benefits									Other Postretirement Benefits
	2019			2018			2017			2019			2018			2017
OCI	$	(194	)	$	90		$	(53	)	$	(13	)	$	20		$	(25	)
Regulatory assets/liabilities	10			(26		)	(1		)	(5		)	(11		)	5
Total recognized in OCI and regulatory assets/liabilities	$	(184	)	$	64		$	(54	)	$	(18	)	$	9		$	(20	)

Schedule of Net Periodic Defined Benefit Costs Included in Income Statement

The following net periodic defined benefit costs (credits) were charged to expense or regulatory assets, excluding amounts charged to construction and other non-expense accounts. The U.K. pension benefits apply to PPL only.

	Pension Benefits
	U.S.							U.K.									Other Postretirement Benefits
	2019			2018		2017		2019			2018			2017			2019		2018			2017
PPL	$	18		$	40	$	59	$	(287	)	$	(226	)	$	(151	)	$	8	$	2		$	5
PPL Electric (a)	(4		)	4		12											4		(1		)	—
LKE (b)	12			21		28											2		3			5
LG&E (b)	3			4		8											2		2			3
KU (a) (b)	(1		)	2		4											—		1			1

(a) PPL Electric and KU do not directly sponsor any defined benefit plans. PPL Electric and KU were allocated these costs of defined benefit plans sponsored by PPL Services (for PPL Electric) and by LKE (for KU), based on their participation in those plans, which management believes are reasonable. KU is also allocated costs of defined benefit plans from LKS for defined benefit plans sponsored by LKE. See Note 14 for additional information on costs allocated to KU from LKS.

(b)

As a result of the 2014 Kentucky rate case settlement that became effective July 1, 2015, the difference between net periodic defined benefit costs calculated in accordance with LKE's, LG&E's and KU's pension accounting policy and the net periodic defined benefit costs calculated using a 15 year amortization period for gains and losses is recorded as a regulatory asset. Of the costs charged to Other operation and maintenance, Other Income (Expense) - net or regulatory assets, excluding amounts charged to construction and other non-expense accounts, $2 million for LG&E and $1 million for KU were recorded as regulatory assets in 2019, $3 million for LG&E and $2 million for KU were recorded as regulatory assets in 2018 and $4 million for LG&E and $2 million for KU were recorded as regulatory assets in 2017.

Defined Benefit Plan Assumptions and Impact of One Point Change on Postretirement Plans

The following weighted-average assumptions were used in the valuation of the benefit obligations at December 31. The U.K. pension benefits apply to PPL only.

	Pension Benefits
	U.S.				U.K.				Other Postretirement Benefits
	2019		2018		2019		2018		2019		2018
PPL
Discount rate	3.64	%	4.35	%	1.94	%	2.98	%	3.60	%	4.31	%
Rate of compensation increase	3.79	%	3.79	%	3.25	%	3.50	%	3.76	%	3.76	%
LKE
Discount rate	3.62	%	4.35	%					3.59	%	4.32	%
Rate of compensation increase	3.50	%	3.50	%					3.50	%	3.50	%
LG&E
Discount rate	3.60	%	4.33	%

The following weighted-average assumptions were used to determine the net periodic defined benefit costs for the years ended December 31. The U.K. pension benefits apply to PPL only.

	Pension Benefits
	U.S.						U.K.						Other Postretirement Benefits
	2019		2018		2017		2019		2018		2017		2019		2018		2017
PPL
Discount rate service cost	4.35	%	3.70	%	4.21	%	3.12	%	2.73	%	2.99	%	4.31	%	3.64	%	4.11	%
Discount rate interest cost	4.35	%	3.70	%	4.21	%	2.62	%	2.31	%	2.41	%	4.31	%	3.64	%	4.11	%
Rate of compensation increase	3.79	%	3.78	%	3.95	%	3.50	%	3.50	%	3.50	%	3.76	%	3.75	%	3.92	%
Expected return on plan assets	7.25	%	7.25	%	7.00	%	7.21	%	7.23	%	7.22	%	6.46	%	6.40	%	6.21	%
LKE
Discount rate	4.35	%	3.69	%	4.19	%							4.32	%	3.65	%	4.12	%
Rate of compensation increase	3.50	%	3.50	%	3.50	%							3.50	%	3.50	%	3.50	%
Expected return on plan assets (a)	7.25	%	7.25	%	7.00	%							7.00	%	7.15	%	6.82	%
LG&E
Discount rate	4.33	%	3.65	%	4.13	%
Expected return on plan assets (a)	7.25	%	7.25	%	7.00	%

(a) 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.

(PPL and LKE)

The following table provides the assumed health care cost trend rates for the years ended December 31:

	2019		2018		2017
PPL and LKE
Health care cost trend rate assumed for next year
– obligations	6.6	%	6.6	%	6.6	%
– cost	6.6	%	6.6	%	7.0	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)
– obligations	5.0	%	5.0	%	5.0	%
– cost	5.0	%	5.0	%	5.0	%
Year that the rate reaches the ultimate trend rate
– obligations	2024		2023		2022
– cost	2023		2022		2022

Schedule of Funded Status of Defined Benefit Plans

The funded status of PPL's plans at December 31 was as follows:

	Pension Benefits
	U.S.						U.K.						Other Postretirement Benefits
	2019			2018			2019			2018			2019			2018
Change in Benefit Obligation
Benefit Obligation, beginning of period	$	3,883		$	4,288		$	7,275		$	8,219		$	538		$	589
Service cost	50			62			68			82			6			7
Interest cost	164			156			187			185			22			21
Participant contributions	—			—			12			13			14			13
Plan amendments	2			1			—			12			—			—
Actuarial (gain) loss	368			(352		)	1,220			(406		)	34			(34		)
Settlements	(21		)	—			—			—			—			—
Gross benefits paid	(300		)	(272		)	(363		)	(381		)	(58		)	(58		)
Federal subsidy	—			—			—			—			1			—
Currency conversion	—			—			116			(449		)	—			—
Benefit Obligation, end of period	4,146			3,883			8,515			7,275			557			538
Change in Plan Assets
Plan assets at fair value, beginning of period	3,109			3,488			7,801			8,490			301			405
Actual return on plan assets	735			(260		)	1,095			(30		)	71			(20		)
Employer contributions	63			153			278			188			10			23
Participant contributions	—			—			12			13			10			11
Transfer out (a)	—			—			—			—			—			(65		)
Settlements	(22		)	—			—			—			—			—
Gross benefits paid	(300		)	(272		)	(363		)	(381		)	(52		)	(53		)
Currency conversion	—			—			122			(479		)	—			—
Plan assets at fair value, end of period	3,585			3,109			8,945			7,801			340			301
Funded Status, end of period	$	(561	)	$	(774	)	$	430		$	526		$	(217	)	$	(237	)
Amounts recognized in the Balance Sheets consist of:
Noncurrent asset	$	24		$	—		$	440		$	535		$	11		$	2
Current liability	(8		)	(13		)	(1		)	(1		)	(2		)	(3		)
Noncurrent liability	(577		)	(761		)	(9		)	(8		)	(226		)	(236		)
Net amount recognized, end of period	$	(561	)	$	(774	)	$	430		$	526		$	(217	)	$	(237	)

	Pension Benefits
	U.S.				U.K.				Other Postretirement Benefits
	2019		2018		2019		2018		2019		2018
Amounts recognized in AOCI and regulatory assets/liabilities (pre-tax) consist of:
Prior service cost (credit)	$	34	$	40	$	11	$	12	$	10	$	10
Net actuarial (gain) loss	1,029		1,207		3,435		2,806		6		24
Total (b)	$	1,063	$	1,247	$	3,446	$	2,818	$	16	$	34
Total accumulated benefit obligation for defined benefit pension plans	$	3,910	$	3,668	$	7,821	$	6,689

(a) In May 2018, PPL received a favorable private letter ruling from the IRS permitting a transfer of excess funds from the PPL Bargaining Unit Retiree Health Plan VEBA to a new subaccount within the VEBA to be used to pay medical claims of active bargaining unit employees.

(b) 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.

For PPL's U.S. pension and other postretirement benefit plans, the amounts recognized in AOCI and regulatory assets/liabilities at December 31 were as follows:

	U.S. Pension Benefits				Other Postretirement Benefits
	2019		2018		2019		2018
AOCI	$	352	$	370	$	13	$	21
Regulatory assets/liabilities	711		877		3		13
Total	$	1,063	$	1,247	$	16	$	34

Schedule of Projected or Accumulated Benefit Obligations In Excess of Plan Assets

The following tables provide information on pension plans where the projected benefit obligation (PBO) or accumulated benefit obligation (ABO) exceed the fair value of plan assets:

	U.S.				U.K.
	PBO in excess of plan assets				PBO in excess of plan assets
	2019		2018		2019		2018
Projected benefit obligation	$	3,861	$	3,883	$	10	$	9
Fair value of plan assets	3,275		3,109		—		—
	U.S.				U.K.
	ABO in excess of plan assets				ABO in excess of plan assets
	2019		2018		2019		2018
Accumulated benefit obligation	$	3,624	$	3,668	$	10	$	9
Fair value of plan assets	3,275		3,109		—		—

Schedules of Asset Allocation of U.S. Pension Trusts Assets

The asset allocation for the trust and the target allocation by portfolio at December 31 are as follows:

	Percentage of trust assets				2019
	2019 (a)		2018 (a)		Target Asset Allocation (a)
Growth Portfolio	57	%	55	%	55	%
Equity securities	34	%	30	%
Debt securities (b)	14	%	15	%
Alternative investments	9	%	10	%
Immunizing Portfolio	42	%	43	%	43	%
Debt securities (b)	35	%	39	%
Derivatives	7	%	4	%
Liquidity Portfolio	1	%	2	%	2	%
Total	100	%	100	%	100	%

(a) Allocations exclude consideration of a group annuity contract held by the LG&E and KU Retirement Plan.

(b)

Includes commingled debt funds, which PPL treats as debt securities for asset allocation purposes.

Schedule of Fair Value of Financial Assets for U.S. Pension Plan Assets

The fair value of net assets in the Master Trust by asset class and level within the fair value hierarchy was:

	December 31, 2019								December 31, 2018
			Fair Value Measurements Using								Fair Value Measurements Using
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
PPL Services Corporation Master Trust
Cash and cash equivalents	$	182	$	182	$	—	$	—	$	220	$	220	$	—	$	—
Equity securities:
U.S. Equity	194		194		—		—		159		159		—		—
U.S. Equity fund measured at NAV (a)	451		—		—		—		340		—		—		—
International equity fund at NAV (a)	554		—		—		—		466		—		—		—
Commingled debt measured at NAV (a)	621		—		—		—		543		—		—		—
Debt securities:
U.S. Treasury and U.S. government sponsored agency	310		309		1		—		212		212		—		—
Corporate	951		—		931		20		899		—		874		25
Other	14		—		14		—		17		—		17		—
Alternative investments:
Real estate measured at NAV (a)	88		—		—		—		90		—		—		—
Private equity measured at NAV (a)	62		—		—		—		65		—		—		—
Hedge funds measured at NAV (a)	194		—		—		—		175		—		—		—

	December 31, 2019									December 31, 2018
				Fair Value Measurements Using									Fair Value Measurements Using
	Total			Level 1		Level 2		Level 3		Total			Level 1		Level 2		Level 3
Derivatives	3			—		3		—		33			—		33		—
Insurance contracts	4			—		—		4		21			—		—		21
PPL Services Corporation Master Trust assets, at fair value	3,628			$	685	$	949	$	24	3,240			$	591	$	924	$	46
Receivables and payables, net (b)	99									(2		)
401(h) accounts restricted for other postretirement benefit obligations	(142		)							(129		)
Total PPL Services Corporation Master Trust pension assets	$	3,585								$	3,109

(a) In accordance with accounting guidance certain investments that are measured at fair value using the net asset value per share (NAV), or its equivalent, practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position.

(b)

Receivables and payables, net represents amounts for investments sold/purchased but not yet settled along with interest and dividends earned but not yet received.

Reconciliation of U.S. Pension Trust Assets Classified as Level 3 Included in Earnings

A reconciliation of the Master Trust assets classified as Level 3 at December 31, 2019 is as follows:

	Corporate debt			Insurance contracts			Total
Balance at beginning of period	$	25		$	21		$	46
Actual return on plan assets
Relating to assets still held at the reporting date	(1		)	4			3
Relating to assets sold during the period	3			—			3
Purchases, sales and settlements	(7		)	(21		)	(28		)
Balance at end of period	$	20		$	4		$	24

A reconciliation of the Master Trust assets classified as Level 3 at December 31, 2018 is as follows: 

	Corporate debt			Insurance contracts			Total
Balance at beginning of period	$	13		$	24		$	37
Actual return on plan assets
Relating to assets still held at the reporting date	(2		)	1			(1		)
Relating to assets sold during the period	3			—			3
Purchases, sales and settlements	11			(4		)	7
Balance at end of period	$	25		$	21		$	46

Schedules of Target Allocation of U.S. Other Postretirement Benefit Plans VEBA Trust

The asset allocation for the PPL VEBA trusts, excluding LKE, and the target allocation, by asset class, at December 31 are detailed below.

	Percentage of plan assets				Target Asset Allocation
	2019		2018		2019
Asset Class
U.S. Equity securities	45	%	40	%	45	%
Debt securities (a)	52	%	56	%	50	%
Cash and cash equivalents (b)	3	%	4	%	5	%
Total	100	%	100	%	100	%

 

(a) Includes commingled debt funds and debt securities.

(b)

Includes money market funds.

Schedule of Fair Value of Financial Assets for U.S. Postretirement Benefits

The fair value of assets in the U.S. other postretirement benefit plans by asset class and level within the fair value hierarchy was:

	December 31, 2019								December 31, 2018
			Fair Value Measurement Using								Fair Value Measurement Using
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Money market funds	$	6	$	6	$	—	$	—	$	6	$	6	$	—	$	—
U.S. Equity securities:
Large-cap equity fund measure at NAV (a)	89		—		—		—		69		—		—		—
Commingled debt fund measured at NAV (a)	68		—		—		—		68		—		—		—
Debt securities:
Corporate bonds	35		—		35		—		28		—		28		—
Total VEBA trust assets, at fair value	198		$	6	$	35	$	—	171		$	6	$	28	$	—
Receivables and payables, net (b)	—								1
401(h) account assets	142								129
Total other postretirement benefit plan assets	$	340							$	301

(a) In accordance with accounting guidance certain investments that are measured at fair value using the net asset value per share (NAV), or its equivalent, practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position.

(b)

Receivables and payables represent amounts for investments sold/purchased but not yet settled along with interest and dividends earned but not yet received.

Schedules of Asset Allocation of U.K. Pension Plan Assets

The asset allocation and target allocation at December 31 of WPD's pension plans are detailed below.

					Target Asset
	Percentage of plan assets				Allocation
	2019		2018		2019
Asset Class
Cash and cash equivalents	2	%	2	%	—	%
Equity securities
U.K.	—	%	—	%	2	%
European (excluding the U.K.)	—	%	1	%	1	%
Asian-Pacific	—	%	1	%	1	%
North American	1	%	1	%	1	%
Emerging markets	—	%	1	%	1	%
Global equities	19	%	19	%	9	%
Global Tactical Asset Allocation	29	%	31	%	41	%
Debt securities (a)	43	%	38	%	38	%
Alternative investments	6	%	6	%	6	%
Total	100	%	100	%	100	%

 

(a)

Includes commingled debt funds.

Schedule of Fair Value of Financial Assets for U.K. Pension Plan Assets

The fair value of assets in the U.K. pension plans by asset class and level within the fair value hierarchy was:

	December 31, 2019									December 31, 2018
				Fair Value Measurement Using								Fair Value Measurement Using
	Total			Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Cash and cash equivalents	$	154		$	154	$	—	$	—	$	147	$	147	$	—	$	—
Equity securities measured at NAV (a) :
U.K. companies	22			—		—		—		27		—		—		—
European companies (excluding the U.K.)	54			—		—		—		76		—		—		—
Asian-Pacific companies	35			—		—		—		49		—		—		—
North American companies	74			—		—		—		105		—		—		—
Emerging markets companies	32			—		—		—		44		—		—		—
Global Equities	1,684			—		—		—		1,465		—		—		—
Other	2,584			—		—		—		2,437		—		—		—
Debt Securities:
U.K. corporate bonds	5			—		5		—		4		—		4		—
U.K. gilts	3,819			—		3,819		—		2,933		—		2,933		—
Alternative investments:
Real estate measured at NAV (a)	519			—		—		—		485		—		—		—
Fair value - U.K. pension plans	8,982			$	154	$	3,824	$	—	7,772		$	147	$	2,937	$	—
Receivables and payables, net (b)	(37		)							29
Total U.K. pension assets	$	8,945								$	7,801

(a) In accordance with accounting guidance certain investments that are measured at fair value using the net asset value per share (NAV), or its equivalent, practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position.

(b)

Receivables and payables, net represents amounts for investments sold/purchased but not yet settled along with interest and dividends earned but not yet received.

Schedule of Expected Cash Flows - U.S. Defined Benefit Plans - Expected Payments and Related Federal Subsidy

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid by the plans and the following federal subsidy payments are expected to be received by PPL.

			Other Postretirement
	Pension		Benefit Payment		Expected Federal Subsidy
2020	$	271	$	50	$	1
2021	267		48		1
2022	266		47		—
2023	264		46		—
2024	265		44		—
2025-2029	1,278		200		1

Schedule of Expected Cash Flows - U.K. Pension Plans - Expected Payments

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid by the plans.

	Pension
2020	$	353
2021	351
2022	356
2023	359
2024	364
2025-2029	1,826

Expected Employer Contributions to U.S. Savings Plans

Substantially all employees of PPL's subsidiaries are eligible to participate in deferred savings plans (401(k)s). Employer contributions to the plans were:

	2019		2018		2017
PPL	$	42	$	40	$	36
PPL Electric	6		6		6
LKE	21		20		18
LG&E	6		6		5
KU	5		5		4

PPL Electric Utilities Corp [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Funded Status of Defined Benefit Plans

Allocations to PPL Electric resulted in liabilities at December 31 as follows:

	2019		2018
Pension	$	179	$	285
Other postretirement benefits	122		120

LG And E And KU Energy LLC [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule Of Net Periodic Defined Benefit Costs (Credits)

The following table provides the components of net periodic defined benefit costs for LKE's pension and other postretirement benefit plans for the years ended December 31.

	Pension Benefits									Other Postretirement Benefits
	2019			2018			2017			2019			2018			2017
Net periodic defined benefit costs (credits):
Service cost	$	22		$	25		$	24		$	4		$	4		$	4
Interest cost	66			63			68			8			8			9
Expected return on plan assets	(101		)	(102		)	(92		)	(8		)	(9		)	(7		)
Amortization of:
Prior service cost	8			9			8			1			1			1
Actuarial (gain) loss (a)	22			35			31			(1		)	—			—
Net periodic defined benefit costs (b)	$	17		$	30		$	39		$	4		$	4		$	7
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross:
Net (gain) loss	$	(37	)	$	40		$	30		$	(14	)	$	1		$	(14	)
Prior service cost	2			—			7			—			—			8
Amortization of:
Prior service credit	(8		)	(9		)	(8		)	(1		)	(1		)	(1		)
Actuarial gain (loss)	(22		)	(35		)	(32		)	1			—			—
Total recognized in OCI and regulatory assets/liabilities	(65		)	(4		)	(3		)	(14		)	—			(7		)
Total recognized in net periodic defined benefit costs, OCI and regulatory assets/liabilities	$	(48	)	$	26		$	36		$	(10	)	$	4		$	—

(a) As a result of the 2014 Kentucky rate case settlement that became effective July 1, 2015, the difference between actuarial (gain)/loss calculated in accordance with LKE's pension accounting policy and actuarial (gain)/loss calculated using a 15 year amortization period was $5 million in 2019 and $11 million in 2018 and 2017.

(b) Due to the amount of lump sum payment distributions from the LG&E qualified pension plan, settlement charges of $5 million in 2019, $6 million in 2018 and $5 million in 2017 were incurred. In accordance with existing regulatory accounting treatment, LG&E has maintained the settlement charge in regulatory assets. The amount will be amortized in accordance with existing regulatory practice.

Schedule of Amounts Recognized in Other Comprehensive Income and Regulatory Assets and Liabilities

For LKE's pension and other postretirement benefits, the amounts recognized in OCI and regulatory assets/liabilities for the years ended December 31 were as follows:

	Pension Benefits									Other Postretirement Benefits
	2019			2018			2017			2019			2018			2017
OCI	$	13		$	(25	)	$	33		$	(7	)	$	4		$	(2	)
Regulatory assets/liabilities	(78		)	21			(36		)	(7		)	(4		)	(5		)
Total recognized in OCI and regulatory assets/liabilities	$	(65	)	$	(4	)	$	(3	)	$	(14	)	$	—		$	(7	)

Defined Benefit Plan Assumptions and Impact of One Point Change on Postretirement Plans

The following weighted-average assumptions were used in the valuation of the benefit obligations at December 31. The U.K. pension benefits apply to PPL only.

	Pension Benefits
	U.S.				U.K.				Other Postretirement Benefits
	2019		2018		2019		2018		2019		2018
PPL
Discount rate	3.64	%	4.35	%	1.94	%	2.98	%	3.60	%	4.31	%
Rate of compensation increase	3.79	%	3.79	%	3.25	%	3.50	%	3.76	%	3.76	%
LKE
Discount rate	3.62	%	4.35	%					3.59	%	4.32	%
Rate of compensation increase	3.50	%	3.50	%					3.50	%	3.50	%
LG&E
Discount rate	3.60	%	4.33	%

The following weighted-average assumptions were used to determine the net periodic defined benefit costs for the years ended December 31. The U.K. pension benefits apply to PPL only.

	Pension Benefits
	U.S.						U.K.						Other Postretirement Benefits
	2019		2018		2017		2019		2018		2017		2019		2018		2017
PPL
Discount rate service cost	4.35	%	3.70	%	4.21	%	3.12	%	2.73	%	2.99	%	4.31	%	3.64	%	4.11	%
Discount rate interest cost	4.35	%	3.70	%	4.21	%	2.62	%	2.31	%	2.41	%	4.31	%	3.64	%	4.11	%
Rate of compensation increase	3.79	%	3.78	%	3.95	%	3.50	%	3.50	%	3.50	%	3.76	%	3.75	%	3.92	%
Expected return on plan assets	7.25	%	7.25	%	7.00	%	7.21	%	7.23	%	7.22	%	6.46	%	6.40	%	6.21	%
LKE
Discount rate	4.35	%	3.69	%	4.19	%							4.32	%	3.65	%	4.12	%
Rate of compensation increase	3.50	%	3.50	%	3.50	%							3.50	%	3.50	%	3.50	%
Expected return on plan assets (a)	7.25	%	7.25	%	7.00	%							7.00	%	7.15	%	6.82	%
LG&E
Discount rate	4.33	%	3.65	%	4.13	%
Expected return on plan assets (a)	7.25	%	7.25	%	7.00	%

(a) 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.

(PPL and LKE)

The following table provides the assumed health care cost trend rates for the years ended December 31:

	2019		2018		2017
PPL and LKE
Health care cost trend rate assumed for next year
– obligations	6.6	%	6.6	%	6.6	%
– cost	6.6	%	6.6	%	7.0	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)
– obligations	5.0	%	5.0	%	5.0	%
– cost	5.0	%	5.0	%	5.0	%
Year that the rate reaches the ultimate trend rate
– obligations	2024		2023		2022
– cost	2023		2022		2022

Schedule of Funded Status of Defined Benefit Plans

The funded status of LKE's plans at December 31 was as follows:

	Pension Benefits						Other Postretirement Benefits
	2019			2018			2019			2018
Change in Benefit Obligation
Benefit Obligation, beginning of period	$	1,580		$	1,771		$	205		$	223
Service cost	22			25			4			4
Interest cost	66			63			8			8
Participant contributions	—			—			7			8
Plan amendments	2			—			—			—
Actuarial (gain) loss (b)	166			(168		)	5			(16		)
Settlements	(16		)	—			—			—
Gross benefits paid (a)	(136		)	(111		)	(21		)	(22		)
Benefit Obligation, end of period	1,684			1,580			208			205
Change in Plan Assets
Plan assets at fair value, beginning of period	1,294			1,402			117			116
Actual return on plan assets	304			(106		)	27			(9		)
Employer contributions	24			109			11			24
Participant contributions	—			—			7			8
Settlements	(16		)	—			—			—
Gross benefits paid	(136		)	(111		)	(21		)	(22		)
Plan assets at fair value, end of period	1,470			1,294			141			117
Funded Status, end of period	$	(214	)	$	(286	)	$	(67	)	$	(88	)
Amounts recognized in the Balance Sheets consist of:
Noncurrent asset	$	24		$	—		$	11		$	2
Current liability	(5		)	(4		)	(2		)	(3		)
Noncurrent liability	(233		)	(282		)	(76		)	(87		)
Net amount recognized, end of period	$	(214	)	$	(286	)	$	(67	)	$	(88	)
Amounts recognized in AOCI and regulatory assets/liabilities (pre-tax) consist of:
Prior service cost	$	30		$	35		$	10		$	12
Net actuarial (gain) loss	380			439			(37		)	(25		)
Total	$	410		$	474		$	(27	)	$	(13	)
Total accumulated benefit obligation for defined benefit pension plans	$	1,561		$	1,467

(a) Gross benefits paid by the plans include lump-sum cash payments made to participants during 2019 and 2018 of $74 million and $52 million.

(b) The actuarial (gain) loss for all pension plans in 2019 and 2018 was primarily related to changes in the discount rate used to measure the benefit obligations of those plans.

The amounts recognized in AOCI and regulatory assets/liabilities at December 31 were as follows:

	Pension Benefits				Other Postretirement Benefits
	2019		2018		2019			2018
AOCI	$	132	$	118	$	4		$	10
Regulatory assets/liabilities	278		356		(31		)	(23		)
Total	$	410	$	474	$	(27	)	$	(13	)

Schedule of Projected or Accumulated Benefit Obligations In Excess of Plan Assets

The following tables provide information on pension plans where the projected benefit obligation (PBO) or accumulated benefit obligations (ABO) exceed the fair value of plan assets: 

	PBO in excess of plan assets
	2019		2018
Projected benefit obligation	$	1,398	$	1,580
Fair value of plan assets	1,160		1,294
	ABO in excess of plan assets
	2019		2018
Accumulated benefit obligation	$	1,276	$	1,467
Fair value of plan assets	1,160		1,294

Schedules of Asset Allocation of U.S. Pension Trusts Assets

The asset allocation for the trust and the target allocation by portfolio at December 31 are as follows:

	Percentage of trust assets				2019
	2019 (a)		2018 (a)		Target Asset Allocation (a)
Growth Portfolio	57	%	55	%	55	%
Equity securities	34	%	30	%
Debt securities (b)	14	%	15	%
Alternative investments	9	%	10	%
Immunizing Portfolio	42	%	43	%	43	%
Debt securities (b)	35	%	39	%
Derivatives	7	%	4	%
Liquidity Portfolio	1	%	2	%	2	%
Total	100	%	100	%	100	%

(a) Allocations exclude consideration of a group annuity contract held by the LG&E and KU Retirement Plan.

(b)

Includes commingled debt funds, which PPL treats as debt securities for asset allocation purposes.

Schedule of Fair Value of Financial Assets for U.S. Pension Plan Assets

The fair value of net assets in the Master Trust by asset class and level within the fair value hierarchy was:

	December 31, 2019								December 31, 2018
			Fair Value Measurements Using								Fair Value Measurements Using
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
PPL Services Corporation Master Trust
Cash and cash equivalents	$	182	$	182	$	—	$	—	$	220	$	220	$	—	$	—
Equity securities:
U.S. Equity	194		194		—		—		159		159		—		—
U.S. Equity fund measured at NAV (a)	451		—		—		—		340		—		—		—
International equity fund at NAV (a)	554		—		—		—		466		—		—		—
Commingled debt measured at NAV (a)	621		—		—		—		543		—		—		—
Debt securities:
U.S. Treasury and U.S. government sponsored agency	310		309		1		—		212		212		—		—
Corporate	951		—		931		20		899		—		874		25
Other	14		—		14		—		17		—		17		—
Alternative investments:
Real estate measured at NAV (a)	88		—		—		—		90		—		—		—
Private equity measured at NAV (a)	62		—		—		—		65		—		—		—
Hedge funds measured at NAV (a)	194		—		—		—		175		—		—		—

	December 31, 2019									December 31, 2018
				Fair Value Measurements Using									Fair Value Measurements Using
	Total			Level 1		Level 2		Level 3		Total			Level 1		Level 2		Level 3
Derivatives	3			—		3		—		33			—		33		—
Insurance contracts	4			—		—		4		21			—		—		21
PPL Services Corporation Master Trust assets, at fair value	3,628			$	685	$	949	$	24	3,240			$	591	$	924	$	46
Receivables and payables, net (b)	99									(2		)
401(h) accounts restricted for other postretirement benefit obligations	(142		)							(129		)
Total PPL Services Corporation Master Trust pension assets	$	3,585								$	3,109

(a) In accordance with accounting guidance certain investments that are measured at fair value using the net asset value per share (NAV), or its equivalent, practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position.

(b)

Receivables and payables, net represents amounts for investments sold/purchased but not yet settled along with interest and dividends earned but not yet received.

Reconciliation of U.S. Pension Trust Assets Classified as Level 3 Included in Earnings

A reconciliation of the Master Trust assets classified as Level 3 at December 31, 2019 is as follows:

	Corporate debt			Insurance contracts			Total
Balance at beginning of period	$	25		$	21		$	46
Actual return on plan assets
Relating to assets still held at the reporting date	(1		)	4			3
Relating to assets sold during the period	3			—			3
Purchases, sales and settlements	(7		)	(21		)	(28		)
Balance at end of period	$	20		$	4		$	24

A reconciliation of the Master Trust assets classified as Level 3 at December 31, 2018 is as follows: 

	Corporate debt			Insurance contracts			Total
Balance at beginning of period	$	13		$	24		$	37
Actual return on plan assets
Relating to assets still held at the reporting date	(2		)	1			(1		)
Relating to assets sold during the period	3			—			3
Purchases, sales and settlements	11			(4		)	7
Balance at end of period	$	25		$	21		$	46

Schedule of Fair Value of Financial Assets for U.S. Postretirement Benefits

The fair value of assets in the U.S. other postretirement benefit plans by asset class and level within the fair value hierarchy was:

	December 31, 2019								December 31, 2018
			Fair Value Measurement Using								Fair Value Measurement Using
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Money market funds	$	6	$	6	$	—	$	—	$	6	$	6	$	—	$	—
U.S. Equity securities:
Large-cap equity fund measure at NAV (a)	89		—		—		—		69		—		—		—
Commingled debt fund measured at NAV (a)	68		—		—		—		68		—		—		—
Debt securities:
Corporate bonds	35		—		35		—		28		—		28		—
Total VEBA trust assets, at fair value	198		$	6	$	35	$	—	171		$	6	$	28	$	—
Receivables and payables, net (b)	—								1
401(h) account assets	142								129
Total other postretirement benefit plan assets	$	340							$	301

(a) In accordance with accounting guidance certain investments that are measured at fair value using the net asset value per share (NAV), or its equivalent, practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position.

(b)

Receivables and payables represent amounts for investments sold/purchased but not yet settled along with interest and dividends earned but not yet received.

Schedule of Expected Cash Flows - U.S. Defined Benefit Plans - Expected Payments and Related Federal Subsidy

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid by the plans and the following federal subsidy payments are expected to be received by LKE.

			Other Postretirement
	Pension		Benefit Payment		Expected Federal Subsidy
2020	$	114	$	14	$	1
2021	115		15		—
2022	115		15		—
2023	113		15		—
2024	115		15		—
2025-2029	545		72		1

Louisville Gas And Electric Co [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule Of Net Periodic Defined Benefit Costs (Credits)

The following table provides the components of net periodic defined benefit costs for LG&E's pension benefit plan for the years ended December 31.

	Pension Benefits
	2019			2018			2017
Net periodic defined benefit costs (credits):
Service cost	$	1		$	1		$	1
Interest cost	11			12			13
Expected return on plan assets	(21		)	(22		)	(22		)
Amortization of:
Prior service cost	5			5			5
Actuarial loss (a)	9			7			9
Net periodic defined benefit costs (b)	$	5		$	3		$	6
Other Changes in Plan Assets and Benefit Obligations Recognized in Regulatory Assets - Gross:
Net (gain) loss	$	(19	)	$	22		$	(9	)
Prior service cost	—			—			7
Amortization of:
Prior service credit	(5		)	(5		)	(5		)
Actuarial gain	(9		)	(7		)	(9		)
Total recognized in regulatory assets/liabilities	(33		)	10			(16		)
Total recognized in net periodic defined benefit costs and regulatory assets	$	(28	)	$	13		$	(10	)

(a) As a result of the 2014 Kentucky rate case settlement that became effective July 1, 2015, the difference between actuarial (gain)/loss calculated in accordance with LG&E's pension accounting policy and actuarial (gain)/loss calculated using a 15 year amortization period was $3 million in 2019, $2 million in 2018 and $7 million in 2017.

(b)

Due to the amount of lump sum payment distributions from the LG&E qualified pension plan, settlement charges of $5 million in 2019, $6 million in 2018 and $5 million in 2017 were incurred. In accordance with existing regulatory accounting treatment, LG&E has maintained the settlement charge in regulatory assets. The amount will be amortized in accordance with existing regulatory practice.

Schedule of Net Periodic Defined Benefit Costs Included in Income Statement

In the table above, LG&E amounts include costs for the specific plans it sponsors and the following allocated costs of defined benefit plans sponsored by LKE. LG&E is also allocated costs of defined benefit plans from LKS for defined benefit plans sponsored by LKE. See Note 14 for additional information on costs allocated to LG&E from LKS. These allocations are based on LG&E's participation in those plans, which management believes are reasonable:

	Pension Benefits						Other Postretirement Benefits
	2019		2018		2017		2019		2018		2017
LG&E Non-Union Only	$	—	$	2	$	5	$	2	$	2	$	3

Defined Benefit Plan Assumptions and Impact of One Point Change on Postretirement Plans

The following weighted-average assumptions were used in the valuation of the benefit obligations at December 31. The U.K. pension benefits apply to PPL only.

	Pension Benefits
	U.S.				U.K.				Other Postretirement Benefits
	2019		2018		2019		2018		2019		2018
PPL
Discount rate	3.64	%	4.35	%	1.94	%	2.98	%	3.60	%	4.31	%
Rate of compensation increase	3.79	%	3.79	%	3.25	%	3.50	%	3.76	%	3.76	%
LKE
Discount rate	3.62	%	4.35	%					3.59	%	4.32	%
Rate of compensation increase	3.50	%	3.50	%					3.50	%	3.50	%
LG&E
Discount rate	3.60	%	4.33	%

The following weighted-average assumptions were used to determine the net periodic defined benefit costs for the years ended December 31. The U.K. pension benefits apply to PPL only.

	Pension Benefits
	U.S.						U.K.						Other Postretirement Benefits
	2019		2018		2017		2019		2018		2017		2019		2018		2017
PPL
Discount rate service cost	4.35	%	3.70	%	4.21	%	3.12	%	2.73	%	2.99	%	4.31	%	3.64	%	4.11	%
Discount rate interest cost	4.35	%	3.70	%	4.21	%	2.62	%	2.31	%	2.41	%	4.31	%	3.64	%	4.11	%
Rate of compensation increase	3.79	%	3.78	%	3.95	%	3.50	%	3.50	%	3.50	%	3.76	%	3.75	%	3.92	%
Expected return on plan assets	7.25	%	7.25	%	7.00	%	7.21	%	7.23	%	7.22	%	6.46	%	6.40	%	6.21	%
LKE
Discount rate	4.35	%	3.69	%	4.19	%							4.32	%	3.65	%	4.12	%
Rate of compensation increase	3.50	%	3.50	%	3.50	%							3.50	%	3.50	%	3.50	%
Expected return on plan assets (a)	7.25	%	7.25	%	7.00	%							7.00	%	7.15	%	6.82	%
LG&E
Discount rate	4.33	%	3.65	%	4.13	%
Expected return on plan assets (a)	7.25	%	7.25	%	7.00	%

(a) 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.

Schedule of Funded Status of Defined Benefit Plans

(LG&E)

The funded status of LG&E's plan at December 31, was as follows:

	Pension Benefits
	2019			2018
Change in Benefit Obligation
Benefit Obligation, beginning of period	$	285		$	326
Service cost	1			1
Interest cost	11			12
Actuarial (gain) loss	25			(24		)
Gross benefits paid (a)	(36		)	(30		)
Benefit Obligation, end of period	286			285
Change in Plan Assets
Plan assets at fair value, beginning of period	281			325
Actual return on plan assets	64			(24		)
Employer contributions	1			10
Gross benefits paid	(36		)	(30		)
Plan assets at fair value, end of period	310			281
Funded Status, end of period	$	24		$	(4	)
Amounts recognized in the Balance Sheets consist of:
Noncurrent asset (liability)	$	24		$	(4	)
Net amount recognized, end of period	$	24		$	(4	)
Amounts recognized in regulatory assets (pre-tax) consist of:
Prior service cost	$	17		$	22
Net actuarial loss	79			107
Total	$	96		$	129
Total accumulated benefit obligation for defined benefit pension plan	$	286		$	285

(a)

Gross benefits paid by the plan include lump-sum cash payments made to participants during 2019 and 2018 of $21 million and $16 million.

Allocations to LG&E resulted in (assets)/liabilities at December 31 as follows:

	2019			2018
Pension	$	(7	)	$	7
Other postretirement benefits	63			65

Schedules of Asset Allocation of U.S. Pension Trusts Assets

The asset allocation for the trust and the target allocation by portfolio at December 31 are as follows:

	Percentage of trust assets				2019
	2019 (a)		2018 (a)		Target Asset Allocation (a)
Growth Portfolio	57	%	55	%	55	%
Equity securities	34	%	30	%
Debt securities (b)	14	%	15	%
Alternative investments	9	%	10	%
Immunizing Portfolio	42	%	43	%	43	%
Debt securities (b)	35	%	39	%
Derivatives	7	%	4	%
Liquidity Portfolio	1	%	2	%	2	%
Total	100	%	100	%	100	%

(a) Allocations exclude consideration of a group annuity contract held by the LG&E and KU Retirement Plan.

(b)

Includes commingled debt funds, which PPL treats as debt securities for asset allocation purposes.

Schedule of Fair Value of Financial Assets for U.S. Pension Plan Assets

The fair value of net assets in the Master Trust by asset class and level within the fair value hierarchy was:

	December 31, 2019								December 31, 2018
			Fair Value Measurements Using								Fair Value Measurements Using
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
PPL Services Corporation Master Trust
Cash and cash equivalents	$	182	$	182	$	—	$	—	$	220	$	220	$	—	$	—
Equity securities:
U.S. Equity	194		194		—		—		159		159		—		—
U.S. Equity fund measured at NAV (a)	451		—		—		—		340		—		—		—
International equity fund at NAV (a)	554		—		—		—		466		—		—		—
Commingled debt measured at NAV (a)	621		—		—		—		543		—		—		—
Debt securities:
U.S. Treasury and U.S. government sponsored agency	310		309		1		—		212		212		—		—
Corporate	951		—		931		20		899		—		874		25
Other	14		—		14		—		17		—		17		—
Alternative investments:
Real estate measured at NAV (a)	88		—		—		—		90		—		—		—
Private equity measured at NAV (a)	62		—		—		—		65		—		—		—
Hedge funds measured at NAV (a)	194		—		—		—		175		—		—		—

	December 31, 2019									December 31, 2018
				Fair Value Measurements Using									Fair Value Measurements Using
	Total			Level 1		Level 2		Level 3		Total			Level 1		Level 2		Level 3
Derivatives	3			—		3		—		33			—		33		—
Insurance contracts	4			—		—		4		21			—		—		21
PPL Services Corporation Master Trust assets, at fair value	3,628			$	685	$	949	$	24	3,240			$	591	$	924	$	46
Receivables and payables, net (b)	99									(2		)
401(h) accounts restricted for other postretirement benefit obligations	(142		)							(129		)
Total PPL Services Corporation Master Trust pension assets	$	3,585								$	3,109

(a) In accordance with accounting guidance certain investments that are measured at fair value using the net asset value per share (NAV), or its equivalent, practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in the table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position.

(b)

Receivables and payables, net represents amounts for investments sold/purchased but not yet settled along with interest and dividends earned but not yet received.

Reconciliation of U.S. Pension Trust Assets Classified as Level 3 Included in Earnings

A reconciliation of the Master Trust assets classified as Level 3 at December 31, 2019 is as follows:

	Corporate debt			Insurance contracts			Total
Balance at beginning of period	$	25		$	21		$	46
Actual return on plan assets
Relating to assets still held at the reporting date	(1		)	4			3
Relating to assets sold during the period	3			—			3
Purchases, sales and settlements	(7		)	(21		)	(28		)
Balance at end of period	$	20		$	4		$	24

A reconciliation of the Master Trust assets classified as Level 3 at December 31, 2018 is as follows: 

	Corporate debt			Insurance contracts			Total
Balance at beginning of period	$	13		$	24		$	37
Actual return on plan assets
Relating to assets still held at the reporting date	(2		)	1			(1		)
Relating to assets sold during the period	3			—			3
Purchases, sales and settlements	11			(4		)	7
Balance at end of period	$	25		$	21		$	46

Schedule of Fair Value of Financial Assets for U.S. Postretirement Benefits

The fair value of assets in the U.S. other postretirement benefit plans by asset class and level within the fair value hierarchy was:

	December 31, 2019								December 31, 2018
			Fair Value Measurement Using								Fair Value Measurement Using
	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Money market funds	$	6	$	6	$	—	$	—	$	6	$	6	$	—	$	—
U.S. Equity securities:
Large-cap equity fund measure at NAV (a)	89		—		—		—		69		—		—		—
Commingled debt fund measured at NAV (a)	68		—		—		—		68		—		—		—
Debt securities:
Corporate bonds	35		—		35		—		28		—		28		—
Total VEBA trust assets, at fair value	198		$	6	$	35	$	—	171		$	6	$	28	$	—
Receivables and payables, net (b)	—								1
401(h) account assets	142								129
Total other postretirement benefit plan assets	$	340							$	301

Kentucky Utilities Co [Member]

Defined Benefit Plan Disclosure [Line Items]

Schedule of Funded Status of Defined Benefit Plans

Allocations to KU resulted in (assets)/liabilities at December 31 as follows.

	2019			2018
Pension	$	(31	)	$	1
Other postretirement benefits	16			25