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Utility Rate Regulation (Regulatory Assets and Liabilities) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) Customer | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ (13) | $ 12 | $ 59
Accounting Standards Update 2017-07 [Member] | Defined Benefit Plans [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Regulatory Assets | 1 |  |
Accounting Standards Update 2017-07 [Member] | Defined Benefit Plans [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Regulatory Liabilities | $ 11 |  |
Defined Benefit Plans [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Regulatory Asset Amortization Period | 15 years |  |
Tax Cuts And Jobs Act [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ 2,185 | 2,185 |
PPL Electric [Member] | Storm Costs [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Dec. 31, 2021 |  |
Regulatory Assets and Liabilities - Storm Costs (Numeric) [Abstract] |  |  |
Period over which storm costs will be recovered (in years) | 3 years |  |
PPL Electric [Member] | Unamortized loss on debt [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Dec. 31, 2029 |  |
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 | $ 45 | 33 |
LKE [Member] | Unamortized loss on debt [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Dec. 31, 2044 |  |
LKE [Member] | Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Mar. 31, 2026 |  |
LGE [Member] | Unamortized loss on debt [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Dec. 31, 2044 |  |
LGE [Member] | Fuel Adjustment Clause [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Regulatory Asset Amortization Period | 12 months |  |
LGE [Member] | Interest Rate Swaps [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Dec. 31, 2033 |  |
LGE [Member] | Gas Line Tracker [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Return on equity | 9.70% |  |
Regulatory Assets and Liabilities - Gas Line Tracker (Numeric) [Abstract] |  |  |
Term, in years, of the gas service rider program | 5 years |  |
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 | 9.70% |  |
KU [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Number of Municipal Customers | Customer | 10 |  |
KU [Member] | Unamortized loss on debt [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Dec. 31, 2042 |  |
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 | 9.70% |  |
PPL Electric Utilities Corp [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Regulatory Asset Amortization Period | 5 years |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ 19 | 5 | 62
PPL Electric Utilities Corp [Member] | Accounting Standards Update 2017-07 [Member] | Defined Benefit Plans [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Regulatory Liabilities | $ 5 |  |
PPL Electric Utilities Corp [Member] | Storm Costs [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Dec. 31, 2021 |  |
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] | Unamortized loss on debt [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Dec. 31, 2029 |  |
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] | Tax Cuts And Jobs Act [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ 1,019 | 1,019 |
LG And E And KU Energy LLC [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | (32) | 7 | (1)
Regulatory Assets and Liabilities - Interest Rate Swaps (Numeric) [Abstract] |  |  |
Net cash settlements on terminated interest rate swaps | 0 | 0 | (9)
LG And E And KU Energy LLC [Member] | Accounting Standards Update 2017-07 [Member] | Defined Benefit Plans [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Regulatory Liabilities | 6 |  |
Regulatory Assets | $ 1 |  |
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 | $ 45 | 33 |
LG And E And KU Energy LLC [Member] | Unamortized loss on debt [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Dec. 31, 2044 |  |
LG And E And KU Energy LLC [Member] | Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Mar. 31, 2026 |  |
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ 1,166 | 1,166 |
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] | Interest Rate Swaps [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Dec. 31, 2033 |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Gas Line Tracker [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Return on equity | 9.70% |  |
Regulatory Assets and Liabilities - Gas Line Tracker (Numeric) [Abstract] |  |  |
Term, in years, of the gas service rider program | 5 years |  |
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 | 9.70% |  |
LG And E And KU Energy LLC [Member] | KU [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Number of Municipal Customers | Customer | 10 |  |
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 | 9.70% |  |
Louisville Gas And Electric Co [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ (5) | 5 | 1
Regulatory Assets and Liabilities - Interest Rate Swaps (Numeric) [Abstract] |  |  |
Net cash settlements on terminated interest rate swaps | 0 | 0 | (9)
Louisville Gas And Electric Co [Member] | Accounting Standards Update 2017-07 [Member] | Defined Benefit Plans [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Regulatory Assets | $ 1 |  |
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 | $ 25 | 18 |
Louisville Gas And Electric Co [Member] | Unamortized loss on debt [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Dec. 31, 2044 |  |
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] | Interest Rate Swaps [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Dec. 31, 2033 |  |
Louisville Gas And Electric Co [Member] | Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Mar. 31, 2026 |  |
Louisville Gas And Electric Co [Member] | Gas Line Tracker [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Return on equity | 9.70% |  |
Regulatory Assets and Liabilities - Gas Line Tracker (Numeric) [Abstract] |  |  |
Term, in years, of the gas service rider program | 5 years |  |
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 | 9.70% |  |
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ 532 | 532 |
Kentucky Utilities Co [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Number of Municipal Customers | Customer | 10 |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ (27) | 2 | $ (2)
Kentucky Utilities Co [Member] | Accounting Standards Update 2017-07 [Member] | Defined Benefit Plans [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Regulatory Liabilities | $ 6 |  |
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 | $ 20 | 15 |
Kentucky Utilities Co [Member] | Unamortized loss on debt [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Dec. 31, 2042 |  |
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] | Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Amortization end date | Mar. 31, 2026 |  |
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 | 9.70% |  |
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] |  |  |
Regulatory Assets and Liabilities (Numeric) [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ 634 | $ 634 |

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