Financing Activities - Long-term Debt (Details) - Subsequent Event [Member] $ in Millions	Apr. 30, 2019 USD ($)
LGE [Member] \| Pollution Control Revenue Bonds, 2001 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 128
Stated interest rate	1.85%
Maturity date	Dec. 31, 2033
Repurchase date of debt instruments	Apr. 01, 2021
LGE [Member] \| First Mortgage [Member] \| First Mortgage Bond Due 2049 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 400
Stated interest rate	4.25%
Maturity date	Dec. 31, 2049
Proceeds from Issuance of Secured Debt	$ 396
KU [Member] \| First Mortgage [Member] \| First Mortgage Bond Due 2045 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 300
Stated interest rate	4.375%
Maturity date	Dec. 31, 2045
Proceeds from Issuance of Secured Debt	$ 303
LG And E And KU Energy LLC [Member] \| LGE [Member] \| Pollution Control Revenue Bonds, 2001 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 128
Stated interest rate	1.85%
Maturity date	Dec. 31, 2033
Repurchase date of debt instruments	Apr. 01, 2021
LG And E And KU Energy LLC [Member] \| LGE [Member] \| First Mortgage [Member] \| First Mortgage Bond Due 2049 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 400
Stated interest rate	4.25%
Maturity date	Dec. 31, 2049
Proceeds from Issuance of Secured Debt	$ 396
LG And E And KU Energy LLC [Member] \| KU [Member] \| First Mortgage [Member] \| First Mortgage Bond Due 2045 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 300
Stated interest rate	4.375%
Maturity date	Dec. 31, 2045
Proceeds from Issuance of Secured Debt	$ 303
Louisville Gas And Electric Co [Member] \| Pollution Control Revenue Bonds, 2001 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 128
Stated interest rate	1.85%
Maturity date	Dec. 31, 2033
Repurchase date of debt instruments	Apr. 01, 2021
Louisville Gas And Electric Co [Member] \| First Mortgage [Member] \| First Mortgage Bond Due 2049 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 400
Stated interest rate	4.25%
Maturity date	Dec. 31, 2049
Proceeds from Issuance of Secured Debt	$ 396
Kentucky Utilities Co [Member] \| First Mortgage [Member] \| First Mortgage Bond Due 2045 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 300
Stated interest rate	4.375%
Maturity date	Dec. 31, 2045
Proceeds from Issuance of Secured Debt	$ 303

Date the debt instrument can be repurchased, in CCYY-MM-DD format and interest rates reset.

No definition available.

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Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- References

No definition available.

+ Details

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- Definition

The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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- Details

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