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Contributions to the ESOP are allocated to eligible participants' accounts as of the end of each year, based on this percentage of eligible participants' compensation.

+ References

No definition available.

+ Details

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- Definition

Contributions to the ESOP are allocated to eligible participants' accounts as of the end of each year, based on this percentage of shares held in existing participants' accounts.

+ References

No definition available.

+ Details

Name:	ppl_EmployeeStockOwnershipPlanAllocationBasedOnProrataSharesHeldPercentage
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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the percentage of ESOP shares outstanding as a ratio to total common shares outstanding at the period end.

+ References

No definition available.

+ Details

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Namespace Prefix:	ppl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of plan compensation cost recognized during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 40

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929

+ Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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Retirement and Postemployment Benefits (Savings Plans and Employee Stock Ownership Plan) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Stock Ownership Plan [Member]
Employee Stock Ownership Plan (ESOP) Disclosures (Numeric) [Line Item]
Contributions allocated based on this percentage of shares held in existing participants' accounts	75.00%
Contributions allocated based on this percentage of eligible compensation	25.00%
Compensation expense for ESOP			$ 8
ESOP shares outstanding at period end	7,053,754
ESOP shares percentage of total common shares outstanding	1.00%
Deferred Savings Plans 401K [Member]
Defined Contribution Pension And Other Postretirement Plans [Line Items]
Employer contributions to deferred savings plans	47	41	36
PPL Energy Supply LLC [Member] \| Employee Stock Ownership Plan [Member]
Employee Stock Ownership Plan (ESOP) Disclosures (Numeric) [Line Item]
Contributions allocated based on this percentage of shares held in existing participants' accounts	75.00%
Contributions allocated based on this percentage of eligible compensation	25.00%
PPL Energy Supply LLC [Member] \| Deferred Savings Plans 401K [Member]
Defined Contribution Pension And Other Postretirement Plans [Line Items]
Employer contributions to deferred savings plans	14	12	12
PPL Electric Utilities Corp [Member] \| Employee Stock Ownership Plan [Member]
Employee Stock Ownership Plan (ESOP) Disclosures (Numeric) [Line Item]
Contributions allocated based on this percentage of shares held in existing participants' accounts	75.00%
Contributions allocated based on this percentage of eligible compensation	25.00%
PPL Electric Utilities Corp [Member] \| Deferred Savings Plans 401K [Member]
Defined Contribution Pension And Other Postretirement Plans [Line Items]
Employer contributions to deferred savings plans	6	6	5
LG And E And KU Energy LLC [Member] \| Deferred Savings Plans 401K [Member]
Defined Contribution Pension And Other Postretirement Plans [Line Items]
Employer contributions to deferred savings plans	15	13	12
Louisville Gas And Electric Co [Member] \| Deferred Savings Plans 401K [Member]
Defined Contribution Pension And Other Postretirement Plans [Line Items]
Employer contributions to deferred savings plans	5	7	6
Kentucky Utilities Co [Member] \| Deferred Savings Plans 401K [Member]
Defined Contribution Pension And Other Postretirement Plans [Line Items]
Employer contributions to deferred savings plans	$ 4	$ 6	$ 6