The capacity of the company's baseload generation fleet.

No definition available.

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- Definition

Obligation to return cash collateral received from counterparties under terms of master netting arrangements.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

The amount of cash collateral posted under master netting arrangements.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Definition

The capacity of the company's intermediate and peaking generation fleet.

+ References

No definition available.

+ Details

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- Details

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- Definition

Maximum length of time over which the entity is economically hedging its exposure to the variability in future cash flows for forecasted transactions.

+ References

No definition available.

+ Details

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- Definition

Amount of pre-tax gains (losses) from economic activity related to price and volume risk derivative instruments not designated as hedging instruments, the ineffective portion of qualifying cash flow hedges, and the entire change in fair value of certain cash flow hedges that fail retrospective effectiveness testing.

+ References

No definition available.

+ Details

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- Details

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- Definition

A disclosure of an assertion that the amount of net gains (losses) reclassified into earnings when price risk 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 zero.

+ References

No definition available.

+ Details

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- Definition

The estimated net amount of unrealized gains or losses on price risk 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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- Details

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Derivative Instruments and Hedging Activities (Intro) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 MW	Mar. 31, 2014	Dec. 31, 2014
Master Netting Arrangements (Numeric) [Line Items]
Obligation to return cash collateral obligation under master netting arrangement	$ 11		$ 11
Cash collateral posted under master netting arrangements	22		21
Commodity Price Risk (Non-trading) [Line Items]
Baseload generation fleet capacity (in MW)	6,496
Intermediate and peaking generation fleet capacity (in MW)	3,252
Commodity Price Risk (Non-trading) - Cash Flow Hedges (Numeric) [Abstract]
Net unrealized after-tax gains (losses) expected to be reclassified into earnings within 12 months related to commodity price risk cash flow hedge contracts	18
No or insignificant amounts previously recorded in AOCI reclassified to earnings related to commodity price risk cash flow hedge contracts	There were no such reclassifications for the three months ended March 31, 2015 and 2014.
Commodity Price Risk (Non-trading) - Economic Activity (Numeric) [Abstract]
Year of expiration of the maximum maturity date of economic activity derivative contracts	2020
Unregulated Retail Energy [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(13)	(26)
Unregulated Wholesale Energy [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(92)	(789)
Fuel [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	0	(1)
Energy Purchases [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	145	580
LG And E And KU Energy LLC [Member]
Master Netting Arrangements (Numeric) [Line Items]
Cash collateral posted under master netting arrangements	22		21
Louisville Gas And Electric Co [Member]
Master Netting Arrangements (Numeric) [Line Items]
Cash collateral posted under master netting arrangements	$ 22		$ 21