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Derivative Instruments and Hedging Activities (Gains and Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments Gain Loss [Line Items]
Interest Expense	$ 513	$ 918	$ 634
Other Income (Expense) - net	54	15	2
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Income (Loss) from Discontinued Operations (net of income taxes)	42	(1,498)	829
Cash Flow Hedges [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from AOCI into Income	(3)	(30)	(32)
Cash Flow Hedges [Member] \| Other Comprehensive Income [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Gain (Loss) Recognized in OCI	0	(50)	(24)
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	(9)
Cash Flow Hedges [Member] \| Interest Rate Swaps [Member] \| Other Income (Expense) Net [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Amount of gain (loss) reclassified from AOCI to income	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)	11	(8)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Amount of gain (loss) reclassified from AOCI to income	(3)	11	(8)
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)	(2)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Amount of gain (loss) reclassified from AOCI to income		(2)	(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)	(15)
Cash Flow Hedges [Member] \| Cross Currency Swaps [Member] \| Other Income (Expense) Net [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Amount of gain (loss) reclassified from AOCI to income	0
Hedged Items	0
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)	(22)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Amount of gain (loss) reclassified from AOCI to income		(39)	(22)
Hedged Items		39	22
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	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	39	(268)	(103)
Gain (loss) recognized as regulatory liabilities/assets	50	5	(2)
Asset value	25	0
Liability value	73	18
Derivatives Not Designated As Hedging Instruments [Member] \| Current Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	20	0
Derivatives Not Designated As Hedging Instruments [Member] \| Current Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	63	1
Derivatives Not Designated As Hedging Instruments [Member] \| Noncurrent Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	5	0
Derivatives Not Designated As Hedging Instruments [Member] \| Noncurrent Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	10	17
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	$ (2)	(2)	(5)
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	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	17
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	11	5	(2)
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	(266)	(98)
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
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	$ 41	0	0
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Energy purchases
Derivatives Not Designated As Hedging Instruments [Member] \| Gas Contract \| Current Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	$ 20	0
Derivatives Not Designated As Hedging Instruments [Member] \| Gas Contract \| Current Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	62	0
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	0
Derivatives Not Designated As Hedging Instruments [Member] \| Gas Contract \| Noncurrent Liabilities [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Liability value	4	0
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	39	0	0
Louisville Gas And Electric Co [Member]
Derivative Instruments Gain Loss [Line Items]
Interest Expense	89	81	87
Other Income (Expense) - net	4	(5)	(1)
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	18
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	17
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	$ (2)	(2)	(5)
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	17
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	11	5	(2)
Kentucky Utilities Co [Member]
Derivative Instruments Gain Loss [Line Items]
Interest Expense	117	109	113
Other Income (Expense) - net	$ 8	$ 4	$ 3