Defined Benefits (Details) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2017	Mar. 31, 2017	Mar. 31, 2016
Pension Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]
Service cost		$ 17	$ 17
Interest cost		42	43
Expected return on plan assets		(57)	(56)
Amortization of: [Abstract]
Prior service cost		2	1
Actuarial loss		20	15
Net periodic defined benefit costs (credits) before special termination benefits		24	20
Special termination benefits		2	0
Net periodic defined benefit costs (credits)		26	20
Pension Benefits United Kingdom [Member]
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]
Service cost		19	18
Interest cost		43	62
Expected return on plan assets		(125)	(133)
Amortization of: [Abstract]
Prior service cost		0	0
Actuarial loss		35	37
Net periodic defined benefit costs (credits) before special termination benefits		(28)	(16)
Special termination benefits		0	0
Net periodic defined benefit costs (credits)		(28)	(16)
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Employer contributions		462
Pension Benefits United Kingdom [Member] \| Subsequent Event [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Employer contributions	$ 23
Other Postretirement Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]
Service cost		2	2
Interest cost		6	6
Expected return on plan assets		(6)	(5)
Amortization of: [Abstract]
Net periodic defined benefit costs (credits)		2	3
PPL Electric Utilities Corp [Member] \| PPL Services [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Costs allocated to subsidiary by plan sponsors		8	6
LG And E And KU Energy LLC [Member] \| Pension Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]
Service cost		7	6
Interest cost		16	17
Expected return on plan assets		(22)	(21)
Amortization of: [Abstract]
Prior service cost		2	1
Actuarial loss		11	5
Net periodic defined benefit costs (credits)		14	8
LG And E And KU Energy LLC [Member] \| Other Postretirement Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]
Service cost		1	1
Interest cost		2	2
Expected return on plan assets		(1)	(2)
Amortization of: [Abstract]
Prior service cost		0	1
Net periodic defined benefit costs (credits)		2	2
Louisville Gas And Electric Co [Member] \| LKE [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Costs allocated to subsidiary by plan sponsors		3	2
Louisville Gas And Electric Co [Member] \| Pension Benefits United States [Member]
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract]
Interest cost		3	3
Expected return on plan assets		(5)	(5)
Amortization of: [Abstract]
Prior service cost		1	1
Actuarial loss		3	2
Net periodic defined benefit costs (credits)		2	1
Kentucky Utilities Co [Member] \| LKE [Member]
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract]
Costs allocated to subsidiary by plan sponsors		$ 4	$ 3

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Total amount of net periodic benefit cost for defined benefit plans for the period allocated to subsidiary.

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The total amount of net periodic benefit cost for defined benefit plans for the period, excluding special termination benefits.

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The amount of gains or losses recognized in net periodic benefit cost.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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Amount of contributions made by the employer to defined benefit plans.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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If applicable, the cost of providing special or contractual termination benefits recognized during the period on the projected benefit obligation.

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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