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Income and Other Taxes (Tax Reform) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Tax Reform [Line Items]      
Income Tax Expense (Benefit) $ 409 $ 458 $ 784
Net Increase in Regulatory Liability 88 (13) 12
Deferred Tax Liabilities, Net 3,064 2,768  
Tax Cuts And Jobs Act [Member]      
Tax Reform [Line Items]      
Taxable Deemed Dividend     462
Income Tax Expense (Benefit)     321
Net Increase in Regulatory Liability 2,185   2,185
Deferred Tax Liabilities, Net     101
Tax Cuts And Jobs Act [Member] | Non-Regulated Deferred Tax Assets And Liabilities [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)     220
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   0  
Income Tax Expense (Benefit)   321  
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Deemed Dividend [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   397  
Income Tax Expense (Benefit)   139  
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (67)  
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (330)  
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Foreign Tax Credit [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)   (157)  
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Valuation Of Foreign Tax Credit Carryforward [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)   110  
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Reduction In U.S. Federal Income Tax Rate [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)   229  
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   0  
Income Tax Expense (Benefit)   321  
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Deemed Dividend [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   462  
Income Tax Expense (Benefit)   161  
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   0  
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (462)  
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Foreign Tax Credit [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)   (205)  
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Valuation Of Foreign Tax Credit Carryforward [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)   145  
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Reduction In U.S. Federal Income Tax Rate [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)   220  
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   0  
Income Tax Expense (Benefit)   0  
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Deemed Dividend [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (65)  
Income Tax Expense (Benefit)   (22)  
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (67)  
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   132  
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Foreign Tax Credit [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)   48  
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Valuation Of Foreign Tax Credit Carryforward [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)   (35)  
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Reduction In U.S. Federal Income Tax Rate [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)   9  
PPL Electric Utilities Corp [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit) 149 136 213
Net Increase in Regulatory Liability 43 19 5
Deferred Tax Liabilities, Net 1,447 1,320  
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)     (13)
Net Increase in Regulatory Liability 1,019   1,019
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Non-Regulated Deferred Tax Assets And Liabilities [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)     (13)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (107)  
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (39)  
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (68)  
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Reduction In U.S. Federal Income Tax Rate [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)   (13)  
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (105)  
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   0  
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (105)  
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Reduction In U.S. Federal Income Tax Rate [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)   (13)  
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (2)  
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (39)  
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   37  
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Reduction In U.S. Federal Income Tax Rate [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)   0  
LG And E And KU Energy LLC [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit) 103 129 375
Net Increase in Regulatory Liability 45 (32) 7
Deferred Tax Liabilities, Net 1,069 956  
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)     112
Net Increase in Regulatory Liability 1,166   1,166
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Non-Regulated Deferred Tax Assets And Liabilities [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)     112
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (60)  
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (28)  
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (32)  
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Reduction In U.S. Federal Income Tax Rate [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)   110  
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (45)  
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   0  
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (45)  
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Reduction In U.S. Federal Income Tax Rate [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)   112  
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (15)  
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (28)  
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   13  
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Reduction In U.S. Federal Income Tax Rate [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)   (2)  
Louisville Gas And Electric Co [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit) 63 64 131
Net Increase in Regulatory Liability 19 (5) 5
Deferred Tax Liabilities, Net 697 628  
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)     0
Net Increase in Regulatory Liability 532   532
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Non-Regulated Deferred Tax Assets And Liabilities [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)     0
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   0  
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (17)  
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   17  
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   0  
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   0  
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   0  
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   0  
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (17)  
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   17  
Kentucky Utilities Co [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit) 79 76 159
Net Increase in Regulatory Liability 26 (27) 2
Deferred Tax Liabilities, Net 792 735  
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)     0
Net Increase in Regulatory Liability $ 634   634
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Non-Regulated Deferred Tax Assets And Liabilities [Member]      
Tax Reform [Line Items]      
Income Tax Expense (Benefit)     $ 0
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   0  
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (11)  
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   11  
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   0  
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   0  
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   0  
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   0  
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   (11)  
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]      
Tax Reform [Line Items]      
Taxable Income (Loss)   $ 11