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Utility Rate Regulation (Regulatory Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | $ 122 | $ 95
Noncurrent regulatory liabilities | 2,714 | 2,704
Generation Supply Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 33 | 34
Transmission Service Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 3 | 9
Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 16 | 1
Universal Service Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 27 | 26
Transmission Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 3 | 9
TCJA surcredit [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 20 | 0
Noncurrent regulatory liabilities | 41 | 0
Storm Damage Expense [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 5 | 8
Accumulated cost of removal of utility plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 674 | 677
Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 59 | 68
Net Deferred Tax Assets [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 1,826 | 1,853
Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 37 | 27
Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 72 | 74
Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 15 | 8
Noncurrent regulatory liabilities | 5 | 5
PPL Electric Utilities Corp [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 74 | 86
Noncurrent regulatory liabilities | 675 | 668
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 | 3 | 9
PPL Electric Utilities Corp [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Universal Service Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 27 | 26
PPL Electric Utilities Corp [Member] | Transmission Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 3 | 9
PPL Electric Utilities Corp [Member] | TCJA surcredit [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 3 | 0
Noncurrent regulatory liabilities | 41 |
PPL Electric Utilities Corp [Member] | Storm Damage Expense [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 5 | 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 Ohio Valley Electric Corporation [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Net Deferred Tax Assets [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 629 | 668
PPL Electric Utilities Corp [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 5 | 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] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Noncurrent regulatory liabilities | 0 | 0
LG And E And KU Energy LLC [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 48 | 9
Noncurrent regulatory liabilities | 2,039 | 2,036
LG And E And KU Energy LLC [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 16 | 1
LG And E And KU Energy LLC [Member] | Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 3
LG And E And KU Energy LLC [Member] | Gas Line Tracker [Member] |  |
Regulatory Liabilities [Line Items] |  |
Regulatory Liabilities | 2 | 3
LG And E And KU Energy LLC [Member] | TCJA surcredit [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 17 | 0
LG And E And KU Energy LLC [Member] | Generation formula rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 7 | 0
LG And E And KU Energy LLC [Member] | Accumulated cost of removal of utility plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 674 | 677
LG And E And KU Energy LLC [Member] | Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 59 | 68
LG And E And KU Energy LLC [Member] | Net Deferred Tax Assets [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 1,197 | 1,185
LG And E And KU Energy LLC [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 32 | 27
LG And E And KU Energy LLC [Member] | Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 72 | 74
LG And E And KU Energy LLC [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 6 | 2
Noncurrent regulatory liabilities | 5 | 5
Louisville Gas And Electric Co [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 17 | 3
Noncurrent regulatory liabilities | 915 | 919
Louisville Gas And Electric Co [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 6 | 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] |  |
Regulatory Liabilities | 2 | 3
Louisville Gas And Electric Co [Member] | TCJA surcredit [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 7 | 0
Louisville Gas And Electric Co [Member] | Generation formula rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | Accumulated cost of removal of utility plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 279 | 282
Louisville Gas And Electric Co [Member] | Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 41 | 47
Louisville Gas And Electric Co [Member] | Net Deferred Tax Assets [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 557 | 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 | 36 | 37
Louisville Gas And Electric Co [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 2 | 0
Noncurrent regulatory liabilities | 2 | 1
Kentucky Utilities Co [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 31 | 6
Noncurrent regulatory liabilities | 1,124 | 1,117
Kentucky Utilities Co [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 10 | 1
Kentucky Utilities Co [Member] | Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 3
Kentucky Utilities Co [Member] | Gas Line Tracker [Member] |  |
Regulatory Liabilities [Line Items] |  |
Regulatory Liabilities | 0 | 0
Kentucky Utilities Co [Member] | TCJA surcredit [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 10 | 0
Kentucky Utilities Co [Member] | Generation formula rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 7 | 0
Kentucky Utilities Co [Member] | Accumulated cost of removal of utility plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 395 | 395
Kentucky Utilities Co [Member] | Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 18 | 21
Kentucky Utilities Co [Member] | Net Deferred Tax Assets [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 640 | 633
Kentucky Utilities Co [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 32 | 27
Kentucky Utilities Co [Member] | Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 36 | 37
Kentucky Utilities Co [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 4 | 2
Noncurrent regulatory liabilities | $ 3 | $ 4

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