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Derivative Instruments and Hedging Activities - Gains and Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense	$ 165	$ 136	$ 494	$ 361
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Other Income (Expense) - net	16	10	51	36
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)	0	(3)	(2)
Amount of gain (loss) reclassified from AOCI to income	(1)	0	(3)	(2)
Cash Flow Hedges [Member] \| Interest Rate Swaps [Member] \| Income (Loss) from Discontinued Operations (net of income taxes)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Amount of gain (loss) reclassified from AOCI to income		0		0
Cash Flow Hedges [Member] \| Interest Rate Swaps [Member] \| Other Income (Expense) -net
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Amount of gain (loss) reclassified from AOCI to income	0		0
Not Designated As Hedging Instruments [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	(5)	17	(12)	27
Gain (loss) recognized as regulatory liabilities/assets	(8)		11
Asset value	0		0		$ 25
Liability value	37		37		73
Not Designated As Hedging Instruments [Member] \| Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0		0		5
Not Designated As Hedging Instruments [Member] \| Current Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	29		29		63
Not Designated As Hedging Instruments [Member] \| Current Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0		0		20
Not Designated As Hedging Instruments [Member] \| Noncurrent Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	8		8		10
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		$ 1
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Interest Expense		Interest Expense
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	4	$ 3	4	$ 11
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		$ 17		$ 26
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Energy purchases		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	2		(5)
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	(14)		12
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 \| Energy Purchases
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	(4)		(11)
Louisville Gas And Electric Co [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest Expense	25	$ 23	76	$ 64
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Other Income (Expense) - net	0	0	2	3
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
Louisville Gas And Electric Co [Member] \| Not Designated As Hedging Instruments [Member] \| 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] \| Current Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	0		0		1
Louisville Gas And Electric Co [Member] \| Not Designated As Hedging Instruments [Member] \| Current 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] \| Noncurrent Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	3		3		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	$ 1
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] \| 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] \| Current Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	0		0		1
Louisville Gas And Electric Co [Member] \| Not Designated As Hedging Instruments [Member] \| Interest Rate Swaps [Member] \| Current 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] \| Noncurrent Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	3		3		$ 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	4	$ 3	4	$ 11
Kentucky Utilities Co [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Other Income (Expense) - net	$ 1	$ 2	$ 6	$ 6