Defined Benefits (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Pension Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	$ 32	$ 26
Interest cost	59	59
Expected return on plan assets	(79)	(74)
Amortization of:
Prior service cost	2	5
Actuarial (gain) loss	25	7
Net periodic defined benefit costs (credits)	39	23
Pension Benefits United Kingdom [Member]
Defined Benefits [Line Items]
Service cost	20	18
Interest cost	79	88
Expected return on plan assets	(131)	(130)
Amortization of:
Prior service cost	0	0
Actuarial (gain) loss	39	33
Net periodic defined benefit costs (credits)	7	9
Other Postretirement Benefits United States [Member]
Defined Benefits [Line Items]
Service cost	4	3
Interest cost	7	8
Expected return on plan assets	(7)	(6)
Amortization of:
Prior service cost	0	0
Actuarial (gain) loss	0	0
Net periodic defined benefit costs (credits)	4	5
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	5
LG And E And KU Energy LLC [Member] \| Pension Benefits United States [Member] \| LKE [Member]
Defined Benefits [Line Items]
Service cost	7	6
Interest cost	17	17
Expected return on plan assets	(22)	(20)
Amortization of:
Prior service cost	2	1
Actuarial (gain) loss	8	3
Net periodic defined benefit costs (credits) prior to termination benefits	12	7
LG And E And KU Energy LLC [Member] \| Other Postretirement Benefits United States [Member] \| LKE [Member]
Defined Benefits [Line Items]
Service cost	1	1
Interest cost	2	2
Expected return on plan assets	(1)	(1)
Amortization of:
Prior service cost	1	1
Actuarial (gain) loss	0	0
Net periodic defined benefit costs (credits) prior to termination benefits	3	3
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] \| LKE [Member]
Defined Benefits [Line Items]
Interest cost	3	4
Expected return on plan assets	(5)	(5)
Amortization of:
Prior service cost	1	1
Actuarial (gain) loss	3	1
Net periodic defined benefit costs (credits) prior to termination benefits	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	$ 5	$ 3

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

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- Definition

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.

+ References

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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

-Topic 715

-SubTopic 30

-Glossary Expected Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512136

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 60

-Glossary Expected Return on Plan Assets

-URI http://asc.fasb.org/extlink&oid=6512171

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (h)(3)

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- Definition

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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- Definition

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.

+ References

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- Definition

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (h)(1)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Service Cost (Component of Net Periodic Pension Cost)

-URI http://asc.fasb.org/extlink&oid=6525008

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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