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Utility Rate Regulation (Regulatory Assets and Liabilities) (Details) - USD ($) $ in Millions |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 29, 2020 | May 21, 2020 | Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  |  |  | $ 63 | $ 88 | $ (13)
Defined Benefit Plans [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 15 years |  |
PPL Electric [Member] | Storm Costs [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities - Storm Costs (Numeric) [Abstract] |  |  |  |  |  |
Period over which storm costs will be recovered (in years) |  |  |  | 3 years |  |
PPL Electric [Member] | Accumulated Cost Of Removal Of Utility Plant [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 5 years |  |
PPL Electric [Member] | Storm Damage Expense Rider [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities - Storm Damage Expense Rider (Numeric) [Abstract] |  |  |  |  |  |
Maximum reportable storm damage expenses to be recovered annually through base rates |  |  |  | $ 20 |  |
PPL Electric [Member] | Act 129 Compliance Rider [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities - Act 129 Compliance Rider (Numeric) [Abstract] |  |  |  |  |  |
Maximum amount of costs that can be recovered under the Act 129 Phase III plan |  |  |  | $ 313 |  |
Period over which program costs can be recovered for Phase III (in years) |  |  |  | 5 years |  |
LKE [Member] | Defined Benefit Plans [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities - Defined Benefit Plans (Numeric) [Abstract] |  |  |  |  |  |
Deferred recovery of the difference between pension costs calculated with pension accounting policy and pension cost using 15 year amortization period |  |  |  | $ 79 | $ 51 |
LGE [Member] | Fuel Adjustment Clause [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 12 months |  |
LGE [Member] | Gas Supply Clause [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 18 months |  |
LGE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 12 months |  |
Return on equity | 9.20% |  |  | 9.20% | 9.725% |
KU [Member] | Fuel Adjustment Clause [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 12 months |  |
KU [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 12 months |  |
Return on equity | 9.20% |  |  | 9.20% | 9.725% |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  |  |  | $ 40 | $ 43 | 19
PPL Electric Utilities Corp [Member] | TCJA customer refund [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities - Gas Line Tracker (Numeric) [Abstract] |  |  |  |  |  |
Approved Amount Of Rate Reduction Due To TCJA |  |  | $ 43 |  |  |
PPL Electric Utilities Corp [Member] | Storm Costs [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities - Storm Costs (Numeric) [Abstract] |  |  |  |  |  |
Period over which storm costs will be recovered (in years) |  |  |  | 3 years |  |
PPL Electric Utilities Corp [Member] | Accumulated Cost Of Removal Of Utility Plant [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 5 years |  |
PPL Electric Utilities Corp [Member] | Storm Damage Expense Rider [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities - Storm Damage Expense Rider (Numeric) [Abstract] |  |  |  |  |  |
Maximum reportable storm damage expenses to be recovered annually through base rates |  |  |  | $ 20 |  |
PPL Electric Utilities Corp [Member] | Act 129 Compliance Rider [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities - Act 129 Compliance Rider (Numeric) [Abstract] |  |  |  |  |  |
Maximum amount of costs that can be recovered under the Act 129 Phase III plan |  |  |  | $ 313 |  |
Period over which program costs can be recovered for Phase III (in years) |  |  |  | 5 years |  |
PPL Electric Utilities Corp [Member] | PPL Electric [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Return on equity |  | 11.18% |  |  |  |
LG And E And KU Energy LLC [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  |  |  | $ 26 | 45 | (32)
LG And E And KU Energy LLC [Member] | Defined Benefit Plans [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 15 years |  |
Regulatory Assets and Liabilities - Defined Benefit Plans (Numeric) [Abstract] |  |  |  |  |  |
Deferred recovery of the difference between pension costs calculated with pension accounting policy and pension cost using 15 year amortization period |  |  |  | $ 79 | $ 51 |
LG And E And KU Energy LLC [Member] | LGE [Member] | Fuel Adjustment Clause [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 12 months |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Gas Supply Clause [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 18 months |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 12 months |  |
Return on equity | 9.20% |  |  | 9.20% | 9.725% |
LG And E And KU Energy LLC [Member] | KU [Member] | Fuel Adjustment Clause [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 12 months |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 12 months |  |
Return on equity | 9.20% |  |  | 9.20% | 9.725% |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  |  |  | $ 0 | $ 19 | (5)
Louisville Gas And Electric Co [Member] | Defined Benefit Plans [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 15 years |  |
Regulatory Assets and Liabilities - Defined Benefit Plans (Numeric) [Abstract] |  |  |  |  |  |
Deferred recovery of the difference between pension costs calculated with pension accounting policy and pension cost using 15 year amortization period |  |  |  | $ 44 | $ 29 |
Louisville Gas And Electric Co [Member] | Fuel Adjustment Clause [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 12 months |  |
Louisville Gas And Electric Co [Member] | Gas Supply Clause [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 18 months |  |
Louisville Gas And Electric Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 12 months |  |
Return on equity | 9.20% |  |  | 9.20% | 9.725% |
Kentucky Utilities Co [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  |  |  | $ 26 | $ 26 | $ (27)
Kentucky Utilities Co [Member] | Defined Benefit Plans [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 15 years |  |
Regulatory Assets and Liabilities - Defined Benefit Plans (Numeric) [Abstract] |  |  |  |  |  |
Deferred recovery of the difference between pension costs calculated with pension accounting policy and pension cost using 15 year amortization period |  |  |  | $ 35 | $ 22 |
Kentucky Utilities Co [Member] | Fuel Adjustment Clause [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 12 months |  |
Kentucky Utilities Co [Member] | Kentucky Public Service Commission [Member] | Environmental Cost Recovery [Member] |  |  |  |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |  |  |  |
Regulatory Asset Amortization Period |  |  |  | 12 months |  |
Return on equity | 9.20% |  |  | 9.20% | 9.725% |

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- Definition The period over which Act 129 Phase III Plan costs will be recovered in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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