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Decrease in the amount of depreciation expense on property, plant and equipment (PPE) resulting from a change in the weighted average useful lives.

+ References

No definition available.

+ Details

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- Definition

Decrease in the after-tax amount of depreciation expense on property, plant and equipment (PPE) resulting from a change in the weighted average useful lives.

+ References

No definition available.

+ Details

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- Definition

Decrease in the per share amount of depreciation expense on property, plant and equipment (PPE) resulting from a change in the weighted average useful lives.

+ References

No definition available.

+ Details

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- Definition

Represents purchases, under a PUC-approved program, of certain accounts receivable from alternative provider of last resort suppliers at a nominal discount, which reflects a provision for uncollectible accounts.

+ References

No definition available.

+ Details

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- Details

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- Definition

Useful life of utility distribution assets owned by public utility, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Details

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Summary of Significant Accounting Policies (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
WPD [Member]
Depreciation (Numeric) [Abstract]
Weighted average useful life	69 years
Decrease in depreciation expense from change in weighted average useful lives	$ (20)
Decrease in depreciation expense from change in weighted average useful lives, after-tax	(16)
Decrease in depreciation expense from change in weighted average useful lives, per share	$ 0.02
WPD [Member] \| Previously Reported [Member]
Depreciation (Numeric) [Abstract]
Weighted average useful life		55 years
Unaffiliated Third Party Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable	331		362
PPL Electric Utilities Corp [Member] \| Unaffiliated Third Party Entity [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable	331		362
PPL Electric Utilities Corp [Member] \| PPL EnergyPlus [Member]
Accounts Receivable (Numeric) [Abstract]
Purchases of accounts receivable	$ 93		$ 105