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Derivative Instruments and Hedging Activities (Tables)
 9 Months Ended
Sep. 30, 2021
Derivative Instruments And Hedging Activities [Line Items]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value The following table presents the fair value and location of derivative instruments recorded on the Balance Sheets.
 September 30, 2021December 31, 2020
Derivatives designated as
hedging instruments		Derivatives not designated
as hedging instruments		Derivatives designated as
hedging instruments		Derivatives not designated
as hedging instruments
 AssetsLiabilitiesAssetsLiabilitiesAssetsLiabilitiesAssetsLiabilities
Current:        
Price Risk Management        
Assets/Liabilities:        
Interest rate swaps (a) (b)$— $— $— $2 $— $— $— $2 
Cross-currency swaps (c)— — — — 94 — — — 
Foreign currency contracts (c)— — — — — — — 137 
Total current— — — 2 94 — — 139 
Noncurrent:        
Price Risk Management        
Assets/Liabilities:        
Interest rate swaps (a) (b)— — — 17 — — — 21 
Cross-currency swaps (c)— — — — 52 — — — 
Total noncurrent— — — 17 52 — — 21 
Total derivatives$— $— $— $19 $146 $— $— $160 
 
(a)Current portion is included in "Price risk management assets" and "Other current liabilities" and noncurrent portion is included in "Price risk management assets" and "Other deferred credits and noncurrent liabilities" on the Balance Sheets.
(b)Excludes accrued interest, if applicable.
(c)Included in "Current assets held for sale" and "Current liabilities held for sale" on the Balance Sheets.
Derivative Instruments, Gain (Loss)
The following tables present the pre-tax effect of derivative instruments recognized in income, OCI or regulatory assets and regulatory liabilities for the period ended September 30, 2021.

 Three MonthsNine Months Three MonthsNine Months
Derivative
Relationships		Derivative Gain
(Loss) Recognized in
OCI		Derivative Gain
(Loss) Recognized in
OCI		Location of
Gain (Loss)
Recognized
in Income
on Derivative		Gain (Loss)
Reclassified
from AOCI
into Income		Gain (Loss)
Reclassified
from AOCI
into
Income
Cash Flow Hedges:     
Interest rate swaps$— $— Interest expense$(1)$12 
Income (Loss) from Discontinued Operations (net of taxes)— (2)
Cross-currency swaps— (50)Income (Loss) from Discontinued Operations (net of taxes)— (39)
Total$— $(50) $(1)$(29)
Derivatives Not Designated as
Hedging Instruments		Location of Gain (Loss) Recognized in
Income on Derivative		Three MonthsNine Months
Foreign currency contractsIncome (Loss) from Discontinued Operations (net of taxes)$— $(266)
Interest rate swapsInterest expense— (2)
 Total$— $(268)
Derivatives Not Designated as
Hedging Instruments		Location of Gain (Loss) Recognized as
Regulatory Liabilities/Assets		Three MonthsNine Months
Interest rate swapsRegulatory assets - noncurrent$1 $4 
 
The following tables present the pre-tax effect of derivative instruments recognized in income, OCI or regulatory assets and regulatory liabilities for the period ended September 30, 2020.
 Three MonthsNine Months Three MonthsNine Months
Derivative
Relationships		Derivative Gain
(Loss) Recognized in
OCI 		Derivative Gain
(Loss) Recognized in
OCI 		Location of
Gain (Loss)
Recognized
in Income
on Derivative		Gain (Loss)
Reclassified
from AOCI
into Income		Gain (Loss)
Reclassified
from AOCI
into Income
Cash Flow Hedges:     
Interest rate swaps$3 $(7)Interest expense$(3)$(7)
Income (Loss) from Discontinued Operations (net of taxes)(1)(2)
Cross-currency swaps(67)(13)Income (Loss) from Discontinued Operations (net of taxes)(56)(24)
Total$(64)$(20) $(60)$(33)
Net Investment Hedges:
Foreign currency contracts in discontinued operations$— $1 
Derivatives Not Designated as
Hedging Instruments		Location of Gain (Loss) Recognized in
Income on Derivative		Three MonthsNine Months
Foreign currency contractsIncome (Loss) from Discontinued operations (net of taxes)$(19)$44 
Interest rate swapsInterest expense(1)(4)
 Total$(20)$40 
Derivatives Not Designated as
Hedging Instruments		Location of Gain (Loss) Recognized as
Regulatory Liabilities/Assets		Three MonthsNine Months
Interest rate swapsRegulatory assets - noncurrent$2 $(5)

The following table presents the effect of cash flow hedge activity on the Statement of Income for the period ended September 30, 2021.
Location and Amount of Gain (Loss) Recognized in Income on Hedging Relationships
Three MonthsNine Months
Interest ExpenseIncome (Loss) from Discontinued Operations (net of income taxes)Interest ExpenseIncome (Loss) from Discontinued Operations (net of income taxes)
Total income and expense line items presented in the income statement in which the effect of cash flow hedges are recorded$183 $(2)$810 $(1,490)
The effects of cash flow hedges:
Gain (Loss) on cash flow hedging relationships:
Interest rate swaps:
Amount of gain (loss) reclassified from AOCI to income(1)— 12 (2)
Cross-currency swaps:
Hedged items— — — 39 
Amount of gain (loss) reclassified from AOCI to Income — — — (39)

The following table presents the effect of cash flow hedge activity on the Statement of Income for the period ended September 30, 2020.
Location and Amount of Gain (Loss) Recognized in Income on Hedging Relationships
Three MonthsNine Months
Interest ExpenseIncome (Loss) from Discontinued Operations (net of taxes)Interest ExpenseIncome (Loss) from Discontinued Operations (net of taxes)
Total income and expense line items presented in the income statement in which the effect of cash flow hedges are recorded$161 $164 $479 $705 
The effects of cash flow hedges:
Gain (Loss) on cash flow hedging relationships:
Interest rate swaps:
Amount of gain (loss) reclassified from AOCI to income(3)(1)(7)(2)
Cross-currency swaps:
Hedged items— 56 — 24 
Amount of gain (loss) reclassified from AOCI to Income— (56)— (24)
Derivative Positions Eligible for Offset with Related Cash Collateral The table below summarizes the derivative positions presented in the balance sheets where a right of setoff exists under these arrangements and related cash collateral received or pledged.
 AssetsLiabilities
  Eligible for Offset  Eligible for Offset 
GrossDerivative
Instruments		Cash
Collateral
Received		NetGrossDerivative
Instruments		Cash
Collateral
Pledged		Net
September 30, 2021        
Treasury Derivatives        
PPL$— $— $— $— $19 $— $— $19 
LG&E— — — — 19 — — 19 
 AssetsLiabilities
  Eligible for Offset  Eligible for Offset 
GrossDerivative
Instruments		Cash
Collateral
Received		NetGrossDerivative
Instruments		Cash
Collateral
Pledged		Net
December 31, 2020       
Treasury Derivatives       
PPL$146 $34 $— $112 $160 $34 $— $126 
LG&E— — — — 23 — — 23 
Louisville Gas And Electric Co [Member]  
Derivative Instruments And Hedging Activities [Line Items]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
The following table presents the fair value and the location on the Balance Sheets of derivatives not designated as hedging instruments.
 September 30, 2021December 31, 2020
 AssetsLiabilities AssetsLiabilities
Current:     
Price Risk Management     
Assets/Liabilities:     
Interest rate swaps$— $2  $— $2 
Total current— 2  — 2 
Noncurrent:     
Price Risk Management     
Assets/Liabilities:     
Interest rate swaps— 17  — 21 
Total noncurrent— 17  — 21 
Total derivatives$— $19  $— $23 
Derivative Instruments, Gain (Loss)
The following tables present the pre-tax effect of derivatives not designated as cash flow hedges that are recognized in income or regulatory assets for the period ended September 30, 2021.
 Location of Gain (Loss) Recognized in  
Derivative InstrumentsIncome on DerivativesThree MonthsNine Months
Interest rate swapsInterest expense$— $(2)
 Location of Gain (Loss) Recognized in  
Derivative InstrumentsRegulatory AssetsThree MonthsNine Months
Interest rate swapsRegulatory assets - noncurrent$1 $4 

The following tables present the pre-tax effect of derivatives not designated as cash flow hedges that are recognized in income or regulatory assets for the period ended September 30, 2020. 
 Location of Gain (Loss) Recognized in  
Derivative InstrumentsIncome on DerivativesThree MonthsNine Months
Interest rate swapsInterest expense$(1)$(4)
 Location of Gain (Loss) Recognized in  
Derivative InstrumentsRegulatory AssetsThree MonthsNine Months
Interest rate swapsRegulatory assets - noncurrent$2 $(5)
Derivative Positions Eligible for Offset with Related Cash Collateral The table below summarizes the derivative positions presented in the balance sheets where a right of setoff exists under these arrangements and related cash collateral received or pledged.
 AssetsLiabilities
  Eligible for Offset  Eligible for Offset 
GrossDerivative
Instruments		Cash
Collateral
Received		NetGrossDerivative
Instruments		Cash
Collateral
Pledged		Net
September 30, 2021        
Treasury Derivatives        
PPL$— $— $— $— $19 $— $— $19 
LG&E— — — — 19 — — 19 
 AssetsLiabilities
  Eligible for Offset  Eligible for Offset 
GrossDerivative
Instruments		Cash
Collateral
Received		NetGrossDerivative
Instruments		Cash
Collateral
Pledged		Net
December 31, 2020       
Treasury Derivatives       
PPL$146 $34 $— $112 $160 $34 $— $126 
LG&E— — — — 23 — — 23