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Income and Other Taxes (Tax Reform) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Tax Reform [Line Items] |  |  |
Income Tax Expense (Benefit) | $ 502 | $ 409 | $ 458
Net Increase in Regulatory Liability | 63 | 88 | (13)
Deferred Tax Liabilities, Net | 3,551 | 3,064 |
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) | 167 | 149 | 136
Net Increase in Regulatory Liability | 40 | 43 | 19
Deferred Tax Liabilities, Net | 1,559 | 1,447 |
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) | 106 | 103 | 129
Net Increase in Regulatory Liability | 26 | 45 | (32)
Deferred Tax Liabilities, Net | 1,175 | 1,069 |
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) | 62 | 63 | 64
Net Increase in Regulatory Liability | 0 | 19 | (5)
Deferred Tax Liabilities, Net | 716 | 697 |
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) | 63 | 79 | 76
Net Increase in Regulatory Liability | 26 | 26 | (27)
Deferred Tax Liabilities, Net | $ 835 | $ 792 |
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

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