Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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- Definition

The high end of the range of time remaining until maturity when a range is presented for a group of derivatives.

+ References

No definition available.

+ Details

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- Definition

Disclosure of an assertion that the amount of net gain (loss) reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period is insignificant or none.

+ References

No definition available.

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- Details

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- Details

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- Details

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- Definition

Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments.

+ References

No definition available.

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- Definition

The maximum maturity date for interest rate swap contracts hedging interest payments on variable rate debt classifed as economic activity.

+ References

No definition available.

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- Definition

The latest settlement date of net investment hedge contracts outstanding.

+ References

No definition available.

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- Definition

The latest termination date of foreign currency contracts classified as economic activity outstanding.

+ References

No definition available.

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- Definition

The earliest settlement date of net investment hedge contracts outstanding.

+ References

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- Definition

The earliest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity outstanding.

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No definition available.

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- Definition

Total exposure hedged through a combination of average rate forwards and average rate options foreign currency contracts for anticipated earnings hedges classified as economic activity.

+ References

No definition available.

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- Definition

A disclosure of an assertion that the current period adjustment in other comprehensive income reflecting gains (losses) on foreign currency transactions that are designated as, and are effective as, hedges of a net investment in a foreign entity, net of tax effect is insignificant or none.

+ References

No definition available.

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- Definition

The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994

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- Definition

Disclosure of an assertion that the amount of interest rate cash flow hedge ineffectiveness is immaterial.

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No definition available.

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- Definition

Nominal or face amount used to calculate payments on a nonderivative instrument.

+ References

No definition available.

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- Definition

Current period adjustment in other comprehensive income reflecting gains or losses on foreign currency transactions that are designated as, and are effective as, hedges of a net investment in a foreign entity, net of tax effect.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 30

-Section 45

-Paragraph 20

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

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- Definition

Cumulative adjustment resulting from gains and losses on foreign currency derivatives that are designated as, and are effective as, hedges of a net investment in a foreign entity, commencing as of the designation date. Adjustment reported in equity as part of accumulated other comprehensive income.

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Derivative Instruments and Hedging Activities (Risk Disclosures) (Details)	3 Months Ended		6 Months Ended									12 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2014 Cash Flow Hedges [Member] USD ($)	Jun. 30, 2013 Cash Flow Hedges [Member]	Jun. 30, 2014 Cash Flow Hedges [Member] USD ($)	Jun. 30, 2013 Cash Flow Hedges [Member]	Jun. 30, 2014 Cash Flow Hedges [Member] Interest Rate Swap Contracts [Member] USD ($)	Jun. 30, 2014 Cash Flow Hedges [Member] Cross Currency Interest Rate Swaps [Member] USD ($)	Jun. 30, 2014 Economic Hedges [Member] Interest Rate Swap Contracts [Member] USD ($)	Jun. 30, 2014 Economic Hedges [Member] Foreign Currency Contracts [Member] USD ($)	Jun. 30, 2014 Economic Hedges [Member] Foreign Currency Contracts [Member] GBP (£)	Jun. 30, 2014 Net Investment Hedges [Member] Foreign Currency Contracts [Member] USD ($)	Jun. 30, 2014 Net Investment Hedges [Member] Foreign Currency Contracts [Member] GBP (£)	Dec. 31, 2013 Net Investment Hedges [Member] Foreign Currency Contracts [Member]	Jun. 30, 2014 Net Investment Hedges [Member] Intercompany Loans [Member]	Jun. 30, 2013 Net Investment Hedges [Member] Intercompany Loans [Member]	Jun. 30, 2014 Net Investment Hedges [Member] Intercompany Loans [Member]	Jun. 30, 2013 Net Investment Hedges [Member] Intercompany Loans [Member] USD ($)	Jun. 30, 2014 WPD [Member] Net Investment Hedges [Member] Intercompany Loans [Member] USD ($)	Jun. 30, 2014 WPD [Member] Net Investment Hedges [Member] Intercompany Loans [Member] GBP (£)	Jun. 30, 2014 LG And E And KU Energy LLC [Member] Economic Hedges [Member] Interest Rate Swap Contracts [Member] USD ($)	Jun. 30, 2014 Louisville Gas And Electric Co [Member] Economic Hedges [Member] Interest Rate Swap Contracts [Member] USD ($)
Interest Rate Risk And Foreign Currency Risk [Line Items]
Notional amount					$ 475,000,000	$ 1,300,000,000	$ 179,000,000			$ 494,000,000	£ 306,000,000								$ 179,000,000	$ 179,000,000
Notional amount of nonderivative instruments																	64,000,000	38,000,000
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]
Year of expiration of the maximum maturity date of interest rate cash flow hedge contracts					2026
Latest maturity date of cross-currency cash flow hedge contracts						2028
Insignificant or no hedge ineffectiveness associated with interest rate cash flow hedges	no hedge ineffectiveness	insignificant	insignificant	insignificant
No or insignificant after-tax gains (losses) previously recorded in AOCI reclassified to earnings related to interest rate cash flow hedge contracts	no such reclassifications	no such reclassifications	insignificant	no such reclassifications
Net unrealized after-tax gains (losses) on interest rate cash flow hedge contracts expected to be reclassified into earnings during next 12 months	(13,000,000)		(13,000,000)
Interest Rate Risk - Economic Activity (Numeric) [Abstract]
Year of expiration of the maximum maturity date of interest rate economic activity contracts							2033												2033	2033
Foreign Currency Risk - Net Investment Hedges (Numeric) [Abstract]
Earliest settlement date of net investment hedge contracts										November 2014	November 2014
Latest settlement date of net investment hedge contracts										June 2016	June 2016
Net after tax gains (losses) on net investment hedges recognized in the foreign currency translation adjustment component of AOCI																6,000,000
Insignificant or no net after tax gains (losses) on net investment hedges recognized in the foreign currency translation adjustment component of AOCI												insignificant	insignificant	insignificant	insignificant
Net after tax gains (losses) on net investment hedges included in the foreign currency translation adjustment component of AOCI										(16,000,000)
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Total exposure hedged related to foreign currency contracts for anticipated earnings hedges classified as economic activity								$ 2,800,000,000	£ 1,700,000,000
Earliest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity								July 2014	July 2014
Latest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity								December 2016	December 2016