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

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
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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=118932676&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfSecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Financing Activities - Long-term Debt (Details) £ in Millions, $ in Millions		3 Months Ended		6 Months Ended
	Apr. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2019 GBP (£)	Jun. 30, 2019 USD ($)	Jun. 30, 2019 GBP (£)
WPD PLC [Member] \| Term Loan Facility [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount \| £					£ 50
Stated interest rate		2.189%		2.189%	2.189%
Proceeds from Issuance of Secured Debt		$ 63	£ 50
Debt instrument term (in years)				5 years
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%
LGE [Member] \| Environmental Facilities Revenue Refunding Bonds, 2007 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount		$ 31		$ 31
Stated interest rate		1.65%		1.65%	1.65%
LGE [Member] \| Environmental Facilities Revenue Refunding Bonds, 2007 Series B [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount		$ 35		$ 35
Stated interest rate		1.65%		1.65%	1.65%
LGE [Member] \| Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2005 Series A [Member] \| Interest Rate Conversion [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount		$ 40		$ 40
LGE [Member] \| First Mortgage [Member] \| First Mortgage Bond Due 2049 [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount	$ 400
Stated interest rate	4.25%
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%
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%
LG And E And KU Energy LLC [Member] \| LGE [Member] \| Environmental Facilities Revenue Refunding Bonds, 2007 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount		$ 31		$ 31
Stated interest rate		1.65%		1.65%	1.65%
LG And E And KU Energy LLC [Member] \| LGE [Member] \| Environmental Facilities Revenue Refunding Bonds, 2007 Series B [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount		$ 35		$ 35
Stated interest rate		1.65%		1.65%	1.65%
LG And E And KU Energy LLC [Member] \| LGE [Member] \| Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2005 Series A [Member] \| Interest Rate Conversion [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount		$ 40		$ 40
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%
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%
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%
Louisville Gas And Electric Co [Member] \| Environmental Facilities Revenue Refunding Bonds, 2007 Series A [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount		$ 31		$ 31
Stated interest rate		1.65%		1.65%	1.65%
Louisville Gas And Electric Co [Member] \| Environmental Facilities Revenue Refunding Bonds, 2007 Series B [Member] \| Remarketed [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount		$ 35		$ 35
Stated interest rate		1.65%		1.65%	1.65%
Louisville Gas And Electric Co [Member] \| Louisville/Jefferson County Metro Government of Kentucky Pollution Control Revenue Bonds, 2005 Series A [Member] \| Interest Rate Conversion [Member]
Long-term Debt (Numeric) [Abstract]
Principal amount		$ 40		$ 40
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%
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%
Proceeds from Issuance of Secured Debt	$ 303