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Utility Rate Regulation - Regulatory Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | $ 87 | $ 101
Noncurrent regulatory liabilities | 873 | 899
Generation Supply Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 29 | 23
Transmission Service Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 6 | 0
Universal Service Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 19 | 14
Transmission Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 4 | 15
Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 11 | 11
Act 129 Compliance Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 7 | 17
Storm Damage Expense [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 7 | 13
Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 678 | 700
Power Purchase Agreement OVEC [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 69 | 75
Net Deferred Tax Assets [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 21 | 23
Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 27 | 23
Terminated Interest Rate Swap [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 74 | 78
Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 4 | 8
Noncurrent regulatory liabilities | 4 | 0
PPL Electric Utilities Corp [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 72 | 83
Noncurrent regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Generation Supply Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 29 | 23
PPL Electric Utilities Corp [Member] | Transmission Service Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 6 | 0
PPL Electric Utilities Corp [Member] | Universal Service Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 19 | 14
PPL Electric Utilities Corp [Member] | Transmission Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 4 | 15
PPL Electric Utilities Corp [Member] | Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Act 129 Compliance Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 7 | 17
PPL Electric Utilities Corp [Member] | Storm Damage Expense [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 7 | 13
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 Tax Assets [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 0 | 0
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 Swap [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 | 1
Noncurrent regulatory liabilities | 0 | 0
LG And E And KU Energy LLC [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 15 | 18
Noncurrent regulatory liabilities | 873 | 899
LG And E And KU Energy LLC [Member] | Demand Side Management [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 3
LG And E And KU Energy LLC [Member] | Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 11 | 11
LG And E And KU Energy LLC [Member] | Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 678 | 700
LG And E And KU Energy LLC [Member] | Power Purchase Agreement OVEC [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 69 | 75
LG And E And KU Energy LLC [Member] | Net Deferred Tax Assets [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 21 | 23
LG And E And KU Energy LLC [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 27 | 23
LG And E And KU Energy LLC [Member] | Terminated Interest Rate Swap [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 74 | 78
LG And E And KU Energy LLC [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 4 | 4
Noncurrent regulatory liabilities | 4 | 0
Louisville Gas And Electric Co [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 5 | 5
Noncurrent regulatory liabilities | 388 | 419
Louisville Gas And Electric Co [Member] | Demand Side Management [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 2
Louisville Gas And Electric Co [Member] | Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 3 | 2
Louisville Gas And Electric Co [Member] | Accumulated Cost Of Removal Of Utility Plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 281 | 305
Louisville Gas And Electric Co [Member] | Power Purchase Agreement OVEC [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 48 | 52
Louisville Gas And Electric Co [Member] | Net Deferred Tax Assets [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 21 | 23
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 Swap [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 37 | 39
Louisville Gas And Electric Co [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 2 | 1
Noncurrent regulatory liabilities | 1 | 0
Kentucky Utilities Co [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 10 | 13
Noncurrent regulatory liabilities | 485 | 480
Kentucky Utilities Co [Member] | Demand Side Management [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 1
Kentucky Utilities Co [Member] | Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 8 | 9
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 | 21 | 23
Kentucky Utilities Co [Member] | Net Deferred Tax Assets [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 0 | 0
Kentucky Utilities Co [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 27 | 23
Kentucky Utilities Co [Member] | Terminated Interest Rate Swap [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 37 | 39
Kentucky Utilities Co [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 2 | 3
Noncurrent regulatory liabilities | $ 3 | $ 0

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