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Derivative Instruments and Hedging Activities (Gains and Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments Gain Loss [Line Items]
Interest Expense	$ 666	$ 513	$ 918
Other Income (Expense) - net	(40)	54	15
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Income (Loss) from Discontinued Operations (net of income taxes)	0	42	(1,498)
Cash Flow Hedges [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from AOCI into Income	(3)	(3)	(30)
Cash Flow Hedges [Member] \| Other Comprehensive Income [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Gain (Loss) Recognized in OCI	0	0	(50)
Cash Flow Hedges [Member] \| Interest Rate Swaps [Member] \| Other Comprehensive Income [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Gain (Loss) Recognized in OCI	0	0	0
Cash Flow Hedges [Member] \| Interest Rate Swaps [Member] \| Interest Expense [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from AOCI into Income	(3)	(3)	11
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Amount of gain (loss) reclassified from AOCI to income	(3)	(3)	11
Cash Flow Hedges [Member] \| Interest Rate Swaps [Member] \| Discontinued Operations (net of income taxes)
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from AOCI into Income			(2)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Amount of gain (loss) reclassified from AOCI to income			(2)
Cash Flow Hedges [Member] \| Cross Currency Swaps [Member] \| Other Comprehensive Income [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Gain (Loss) Recognized in OCI			(50)
Cash Flow Hedges [Member] \| Cross Currency Swaps [Member] \| Interest Expense [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Amount of gain (loss) reclassified from AOCI to income	0	0	0
Hedged Items	0	0	0
Cash Flow Hedges [Member] \| Cross Currency Swaps [Member] \| Discontinued Operations (net of income taxes)
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from AOCI into Income			(39)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Amount of gain (loss) reclassified from AOCI to income			(39)
Hedged Items			39
Net Investment Hedges [Member] \| Foreign Currency Contracts [Member] \| Discontinued Operations (net of income taxes)
Derivative Instruments Gain Loss [Line Items]
Derivative Gain (Loss) Recognized in OCI			1
Derivatives Designated As Hedging Instruments [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0	0
Liability value	0	0
Derivatives Designated As Hedging Instruments [Member] \| Current Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0	0
Derivatives Designated As Hedging Instruments [Member] \| Current Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	0	0
Derivatives Designated As Hedging Instruments [Member] \| Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0	0
Derivatives Designated As Hedging Instruments [Member] \| Noncurrent Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	0	0
Derivatives 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
Derivatives 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
Derivatives 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
Derivatives Designated As Hedging Instruments [Member] \| Interest Rate Swaps [Member] \| Noncurrent Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	0	0
Derivatives Designated As Hedging Instruments [Member] \| Gas Contract \| Current Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0	0
Derivatives Designated As Hedging Instruments [Member] \| Gas Contract \| Current Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	0	0
Derivatives Designated As Hedging Instruments [Member] \| Gas Contract \| Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0	0
Derivatives Designated As Hedging Instruments [Member] \| Gas Contract \| Noncurrent Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	0	0
Derivatives Not Designated As Hedging Instruments [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	(20)	39	(268)
Gain (loss) recognized as regulatory liabilities/assets	1	50	5
Asset value	1	25
Liability value	67	73
Derivatives Not Designated As Hedging Instruments [Member] \| Current Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	1	20
Derivatives Not Designated As Hedging Instruments [Member] \| Current Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	52	63
Derivatives Not Designated As Hedging Instruments [Member] \| Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0	5
Derivatives Not Designated As Hedging Instruments [Member] \| Noncurrent Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	15	10
Derivatives 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	(2)	(2)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest Expense
Derivatives 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
Derivatives 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	1	1
Derivatives 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
Derivatives 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	6	6
Derivatives 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	0	11	5
Derivatives Not Designated As Hedging Instruments [Member] \| Foreign Currency Contracts [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	$ 0	0	(266)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Income (Loss) from Discontinued Operations (net of income taxes)
Derivatives Not Designated As Hedging Instruments [Member] \| Gas Contract \| Current Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	$ 1	20
Derivatives Not Designated As Hedging Instruments [Member] \| Gas Contract \| Current Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	51	62
Derivatives Not Designated As Hedging Instruments [Member] \| Gas Contract \| Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value		5
Derivatives Not Designated As Hedging Instruments [Member] \| Gas Contract \| Noncurrent Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	9	4
Derivatives 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	9	39	0
Derivatives 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	(8)	0	0
Derivatives Not Designated As Hedging Instruments [Member] \| Gas Contract \| Energy Purchases
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	(19)	41	0
Derivatives Not Designated As Hedging Instruments [Member] \| Gas Contract \| Other Income (Expense) - net
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	(1)	0	0
Louisville Gas And Electric Co [Member]
Derivative Instruments Gain Loss [Line Items]
Interest Expense	102	89	81
Other Income (Expense) - net	3	4	(5)
Louisville Gas And Electric Co [Member] \| Derivatives Not Designated As Hedging Instruments [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0	0
Liability value	7	7
Louisville Gas And Electric Co [Member] \| Derivatives Not Designated As Hedging Instruments [Member] \| Current Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0	0
Louisville Gas And Electric Co [Member] \| Derivatives Not Designated As Hedging Instruments [Member] \| Current Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	1	1
Louisville Gas And Electric Co [Member] \| Derivatives Not Designated As Hedging Instruments [Member] \| Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0	0
Louisville Gas And Electric Co [Member] \| Derivatives Not Designated As Hedging Instruments [Member] \| Noncurrent Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	6	6
Louisville Gas And Electric Co [Member] \| Derivatives 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	(2)	(2)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest Expense
Louisville Gas And Electric Co [Member] \| Derivatives 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
Louisville Gas And Electric Co [Member] \| Derivatives 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	1	1
Louisville Gas And Electric Co [Member] \| Derivatives 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
Louisville Gas And Electric Co [Member] \| Derivatives 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	6	6
Louisville Gas And Electric Co [Member] \| Derivatives 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	0	11	5
Kentucky Utilities Co [Member]
Derivative Instruments Gain Loss [Line Items]
Other Income (Expense) - net	$ 8	$ 8	$ 4