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Utility Rate Regulation - Regulatory Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | $ 158 | $ 95
Noncurrent regulatory liabilities | 2,689 | 2,704
Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 18 | 1
Generation Supply Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 33 | 34
Transmission Service Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 16 | 9
Universal Service Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 24 | 26
Transmission Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 10 | 9
Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 2 | 3
Storm Damage Expense Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 12 | 8
Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 677 | 677
Power Purchase Agreement OVEC [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 66 | 68
Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 1,839 | 1,853
Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 28 | 27
Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 74 | 74
TCJA bill credit [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 34 | 0
Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 9 | 5
Noncurrent regulatory liabilities | 5 | 5
PPL Electric Utilities Corp [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 95 | 86
Noncurrent regulatory liabilities | 662 | 668
PPL Electric Utilities Corp [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Generation Supply Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 33 | 34
PPL Electric Utilities Corp [Member] | Transmission Service Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 16 | 9
PPL Electric Utilities Corp [Member] | Universal Service Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 24 | 26
PPL Electric Utilities Corp [Member] | Transmission Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 10 | 9
PPL Electric Utilities Corp [Member] | Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Storm Damage Expense Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 12 | 8
PPL Electric Utilities Corp [Member] | Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Power Purchase Agreement OVEC [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 660 | 668
PPL Electric Utilities Corp [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | TCJA bill credit [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Noncurrent regulatory liabilities | 2 | 0
LG And E And KU Energy LLC [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 63 | 9
Noncurrent regulatory liabilities | 2,027 | 2,036
LG And E And KU Energy LLC [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 18 | 1
LG And E And KU Energy LLC [Member] | Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 2 | 3
LG And E And KU Energy LLC [Member] | Gas Line Tracker [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 2 | 3
LG And E And KU Energy LLC [Member] | Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 677 | 677
LG And E And KU Energy LLC [Member] | Power Purchase Agreement OVEC [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 66 | 68
LG And E And KU Energy LLC [Member] | Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 1,179 | 1,185
LG And E And KU Energy LLC [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 28 | 27
LG And E And KU Energy LLC [Member] | Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 74 | 74
LG And E And KU Energy LLC [Member] | TCJA bill credit [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 34 | 0
LG And E And KU Energy LLC [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 7 | 2
Noncurrent regulatory liabilities | 3 | 5
Louisville Gas And Electric Co [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 29 | 3
Noncurrent regulatory liabilities | 912 | 919
Louisville Gas And Electric Co [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 7 | 0
Louisville Gas And Electric Co [Member] | Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | Gas Line Tracker [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 2 | 3
Louisville Gas And Electric Co [Member] | Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 280 | 282
Louisville Gas And Electric Co [Member] | Power Purchase Agreement OVEC [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 46 | 47
Louisville Gas And Electric Co [Member] | Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 549 | 552
Louisville Gas And Electric Co [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 37 | 37
Louisville Gas And Electric Co [Member] | TCJA bill credit [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 16 | 0
Louisville Gas And Electric Co [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 4 | 0
Noncurrent regulatory liabilities | 0 | 1
Kentucky Utilities Co [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 34 | 6
Noncurrent regulatory liabilities | 1,115 | 1,117
Kentucky Utilities Co [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 11 | 1
Kentucky Utilities Co [Member] | Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 2 | 3
Kentucky Utilities Co [Member] | Gas Line Tracker [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Kentucky Utilities Co [Member] | Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 397 | 395
Kentucky Utilities Co [Member] | Power Purchase Agreement OVEC [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 20 | 21
Kentucky Utilities Co [Member] | Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 630 | 633
Kentucky Utilities Co [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 28 | 27
Kentucky Utilities Co [Member] | Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 37 | 37
Kentucky Utilities Co [Member] | TCJA bill credit [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 18 | 0
Kentucky Utilities Co [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 3 | 2
Noncurrent regulatory liabilities | $ 3 | $ 4

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