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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Derivative Instruments and Hedging Activities - Gains and Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense	$ 188	$ 165	$ 549	$ 494
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Other Income (Expense) - net	32	16	86	51
Cash Flow Hedges [Member] \| Interest Rate Swaps [Member] \| Other Comprehensive Income (Loss) [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Derivative Gain (Loss) Recognized in OCI	0	0	0	0
Cash Flow Hedges [Member] \| Interest Rate Swaps [Member] \| Interest Expense [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (Loss) Reclassified from AOCI into Income	(1)	(1)	(3)	(3)
Amount of gain (loss) reclassified from AOCI to income	(1)	(1)	(3)	(3)
Not Designated As Hedging Instruments [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	(6)	(5)	(31)	(12)
Gain (loss) recognized as regulatory liabilities/assets	(8)	(8)	34	11
Asset value	2		2		$ 1
Liability value	34		34		67
Not Designated As Hedging Instruments [Member] \| Other Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0		0		0
Not Designated As Hedging Instruments [Member] \| Interest Rate Swaps [Member] \| Other Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0		0		0
Not Designated As Hedging Instruments [Member] \| Interest Rate Swaps [Member] \| Regulatory Assets Noncurrent [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized as regulatory liabilities/assets	(3)	4	0	4
Not Designated As Hedging Instruments [Member] \| Gas Contracts
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	(6)		$ (31)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]			Energy purchases
Not Designated As Hedging Instruments [Member] \| Gas Contracts \| Regulatory Assets Noncurrent [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized as regulatory liabilities/assets	(3)		$ 3
Not Designated As Hedging Instruments [Member] \| Gas Contracts \| Regulatory Assets, current
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized as regulatory liabilities/assets	(2)		31
Not Designated As Hedging Instruments [Member] \| Gas Contracts \| Other Nonoperating Income (Expense)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative		(1)		(1)
Not Designated As Hedging Instruments [Member] \| Gas Contracts \| Purchased Power And Gas
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative		(4)		(11)
Not Designated As Hedging Instruments [Member] \| Gas Contract \| Other Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0		0		0
Not Designated As Hedging Instruments [Member] \| Gas Contract \| Regulatory Assets Noncurrent [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized as regulatory liabilities/assets		2		(5)
Not Designated As Hedging Instruments [Member] \| Gas Contract \| Regulatory Assets, current
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized as regulatory liabilities/assets		(14)		12
Louisville Gas And Electric Co [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense	26	25	78	76
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Other Income (Expense) - net	3	0	9	2
Louisville Gas And Electric Co [Member] \| Not Designated As Hedging Instruments [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0		0		0
Liability value	7		7		7
Louisville Gas And Electric Co [Member] \| Not Designated As Hedging Instruments [Member] \| Other Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0		0		0
Louisville Gas And Electric Co [Member] \| Not Designated As Hedging Instruments [Member] \| Price risk management liabilities, current
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	1		1		1
Louisville Gas And Electric Co [Member] \| Not Designated As Hedging Instruments [Member] \| Price risk management, liabilities, noncurrent
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	6		6		6
Louisville Gas And Electric Co [Member] \| Not Designated As Hedging Instruments [Member] \| Interest Rate Swaps [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	$ 0	$ 0	$ 0	$ 0
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest Expense	Interest Expense	Interest Expense	Interest Expense
Louisville Gas And Electric Co [Member] \| Not Designated As Hedging Instruments [Member] \| Interest Rate Swaps [Member] \| Other Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	$ 0		$ 0		0
Louisville Gas And Electric Co [Member] \| Not Designated As Hedging Instruments [Member] \| Interest Rate Swaps [Member] \| Price risk management liabilities, current
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value					1
Louisville Gas And Electric Co [Member] \| Not Designated As Hedging Instruments [Member] \| Interest Rate Swaps [Member] \| Price risk management, liabilities, noncurrent
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value					$ 6
Louisville Gas And Electric Co [Member] \| Not Designated As Hedging Instruments [Member] \| Interest Rate Swaps [Member] \| Regulatory Assets Noncurrent [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized as regulatory liabilities/assets	(3)	$ 4	0	$ 4
Kentucky Utilities Co [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense			102	99
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Other Income (Expense) - net	$ 4	$ 1	$ 10	$ 6