Derivative Instruments and Hedging Activities (Gains and Losses) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments Gain Loss [Line Items]
Interest Expense	$ 918	$ 634	$ 621
Other Income (Expense) - net	15	2	14
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Income (Loss) from Discontinued Operations (net of income taxes)	(1,498)	829	1,010
Cash Flow Hedges [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from AOCI into Income	(30)	(32)	(18)
Cash Flow Hedges [Member] \| Other Comprehensive Income [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Gain (Loss) Recognized in OCI	(50)	(24)	(13)
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	(9)	(30)
Cash Flow Hedges [Member] \| Interest Rate Swaps [Member] \| Interest Expense [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from AOCI into Income	11	(8)	(9)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Amount of gain (loss) reclassified from AOCI to income	11	(8)	(9)
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)	0
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)	17
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)	(9)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Amount of gain (loss) reclassified from AOCI to income	(39)	(22)	(9)
Hedged Items	39	22	9
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	2
Derivatives Designated As Hedging Instruments [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0	146
Derivatives Designated As Hedging Instruments [Member] \| Current Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0	94
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] \| Cross Currency Swaps [Member] \| Current Assets [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Asset value	0	94
Derivatives Designated As Hedging Instruments [Member] \| Foreign Currency Contracts [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]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	(268)	(103)	(19)
Asset value	0	0
Derivatives Not Designated As Hedging Instruments [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 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] \| Regulatory Assets Noncurrent [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized as regulatory liabilities/assets	5	(2)	(1)
Derivatives Not Designated As Hedging Instruments [Member] \| Interest Rate Swaps [Member] \| Interest Expense [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	(2)	(5)	(5)
Derivatives Not Designated As Hedging Instruments [Member] \| Cross Currency 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] \| Foreign Currency Contracts [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] \| Foreign Currency Contracts [Member] \| Discontinued Operations (net of income taxes)
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	(266)	(98)	(14)
Louisville Gas And Electric Co [Member]
Derivative Instruments Gain Loss [Line Items]
Interest Expense	81	87	87
Other Income (Expense) - net	(5)	(1)	(11)
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
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] \| 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] \| Regulatory Assets Noncurrent [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized as regulatory liabilities/assets	5	(2)	(1)
Louisville Gas And Electric Co [Member] \| Derivatives Not Designated As Hedging Instruments [Member] \| Interest Rate Swaps [Member] \| Interest Expense [Member]
Amounts Included in Income, OCI or Regulatory Liabilities/Assets [Abstract]
Gain (loss) recognized in income on derivative	(2)	(5)	(5)
Kentucky Utilities Co [Member]
Derivative Instruments Gain Loss [Line Items]
Interest Expense	109	113	109
Other Income (Expense) - net	$ 4	$ 3	$ (4)

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The pre-tax gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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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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