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Utility Rate Regulation - Regulatory Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | $ 100 | $ 122
Noncurrent regulatory liabilities | 2,700 | 2,714
Generation Supply Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 24 | 33
Transmission Service Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 7 | 3
Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 13 | 16
Universal Service Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 20 | 27
Transmission Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 3
TCJA customer refund [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 9 | 20
Noncurrent regulatory liabilities | 41 | 41
Storm Damage Expense Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 4 | 5
Generation Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 8 | 7
Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 675 | 674
Power Purchase Agreement OVEC [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 57 | 59
Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 1,809 | 1,826
Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 40 | 37
Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 70 | 72
Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 15 | 8
Noncurrent regulatory liabilities | 8 | 5
PPL Electric Utilities Corp [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 60 | 74
Noncurrent regulatory liabilities | 667 | 675
PPL Electric Utilities Corp [Member] | Generation Supply Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 24 | 33
PPL Electric Utilities Corp [Member] | Transmission Service Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 7 | 3
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 | 20 | 27
PPL Electric Utilities Corp [Member] | Transmission Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 3
PPL Electric Utilities Corp [Member] | TCJA customer refund [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 4 | 3
Noncurrent regulatory liabilities | 41 | 41
PPL Electric Utilities Corp [Member] | Storm Damage Expense Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 4 | 5
PPL Electric Utilities Corp [Member] | Generation Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
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 | 619 | 629
PPL Electric Utilities Corp [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 7 | 5
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 | 1 | 0
Noncurrent regulatory liabilities | 0 | 0
LG And E And KU Energy LLC [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 40 | 48
Noncurrent regulatory liabilities | 2,033 | 2,039
LG And E And KU Energy LLC [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 13 | 16
LG And E And KU Energy LLC [Member] | TCJA customer refund [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 5 | 17
LG And E And KU Energy LLC [Member] | Generation Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 8 | 7
LG And E And KU Energy LLC [Member] | Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 675 | 674
LG And E And KU Energy LLC [Member] | Power Purchase Agreement OVEC [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 57 | 59
LG And E And KU Energy LLC [Member] | Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 1,190 | 1,197
LG And E And KU Energy LLC [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 33 | 32
LG And E And KU Energy LLC [Member] | Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 70 | 72
LG And E And KU Energy LLC [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 14 | 8
Noncurrent regulatory liabilities | 8 | 5
Louisville Gas And Electric Co [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 10 | 17
Noncurrent regulatory liabilities | 911 | 915
Louisville Gas And Electric Co [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 5 | 6
Louisville Gas And Electric Co [Member] | TCJA customer refund [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 2 | 7
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 | 278 | 279
Louisville Gas And Electric Co [Member] | Power Purchase Agreement OVEC [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 40 | 41
Louisville Gas And Electric Co [Member] | Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 554 | 557
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 | 35 | 36
Louisville Gas And Electric Co [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 3 | 4
Noncurrent regulatory liabilities | 4 | 2
Kentucky Utilities Co [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 30 | 31
Noncurrent regulatory liabilities | 1,122 | 1,124
Kentucky Utilities Co [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 8 | 10
Kentucky Utilities Co [Member] | TCJA customer refund [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 3 | 10
Kentucky Utilities Co [Member] | Generation Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 8 | 7
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 | 17 | 18
Kentucky Utilities Co [Member] | Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 636 | 640
Kentucky Utilities Co [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 33 | 32
Kentucky Utilities Co [Member] | Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 35 | 36
Kentucky Utilities Co [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 11 | 4
Noncurrent regulatory liabilities | $ 4 | $ 3

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