Utility Rate Regulation (Regulatory Assets) (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2014
|
Dec. 31, 2013
|
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Regulatory Assets [Line Items] | ||
Current regulatory assets | $ 29 | $ 33 |
Noncurrent regulatory assets | 1,242 | 1,246 |
Gas Supply Clause [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 20 | 10 |
Fuel Adjustment Clause [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 2 | |
Defined Benefit Plans [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 493 | 509 |
Taxes Recoverable Through Future Rates [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 312 | 306 |
Storm Costs [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 135 | 147 |
Unamortized Loss On Debt [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 80 | 85 |
Interest Rate Swaps [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 51 | 44 |
Accumulated Cost Of Removal Of Utility Plant [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 105 | 98 |
Demand Side Management [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 3 | 8 |
Asset Retirement Obligations [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 58 | 44 |
Environmental Cost Recovery [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 1 | 7 |
Other Regulatory Assets [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 5 | 6 |
Noncurrent regulatory assets | 8 | 13 |
PPL Electric Utilities Corp [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 2 | 6 |
Noncurrent regulatory assets | 771 | 772 |
PPL Electric Utilities Corp [Member] | Defined Benefit Plans [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 252 | 257 |
PPL Electric Utilities Corp [Member] | Taxes Recoverable Through Future Rates [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 312 | 306 |
PPL Electric Utilities Corp [Member] | Storm Costs [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 49 | 53 |
PPL Electric Utilities Corp [Member] | Unamortized Loss On Debt [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 53 | 57 |
PPL Electric Utilities Corp [Member] | Accumulated Cost Of Removal Of Utility Plant [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 105 | 98 |
PPL Electric Utilities Corp [Member] | Other Regulatory Assets [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 2 | 6 |
Noncurrent regulatory assets | 1 | |
LG And E And KU Energy LLC [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 27 | 27 |
Noncurrent regulatory assets | 471 | 474 |
LG And E And KU Energy LLC [Member] | Gas Supply Clause [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 20 | 10 |
LG And E And KU Energy LLC [Member] | Fuel Adjustment Clause [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 2 | |
LG And E And KU Energy LLC [Member] | Defined Benefit Plans [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 241 | 252 |
LG And E And KU Energy LLC [Member] | Storm Costs [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 86 | 94 |
LG And E And KU Energy LLC [Member] | Unamortized Loss On Debt [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 27 | 28 |
LG And E And KU Energy LLC [Member] | Interest Rate Swaps [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 51 | 44 |
LG And E And KU Energy LLC [Member] | Demand Side Management [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 3 | 8 |
LG And E And KU Energy LLC [Member] | Asset Retirement Obligations [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 58 | 44 |
LG And E And KU Energy LLC [Member] | Environmental Cost Recovery [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 1 | 7 |
LG And E And KU Energy LLC [Member] | Other Regulatory Assets [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 3 | |
Noncurrent regulatory assets | 8 | 12 |
Louisville Gas And Electric Co [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 24 | 17 |
Noncurrent regulatory assets | 306 | 303 |
Louisville Gas And Electric Co [Member] | Gas Supply Clause [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 20 | 10 |
Louisville Gas And Electric Co [Member] | Fuel Adjustment Clause [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 2 | |
Louisville Gas And Electric Co [Member] | Defined Benefit Plans [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 162 | 164 |
Louisville Gas And Electric Co [Member] | Storm Costs [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 47 | 51 |
Louisville Gas And Electric Co [Member] | Unamortized Loss On Debt [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 18 | 18 |
Louisville Gas And Electric Co [Member] | Interest Rate Swaps [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 51 | 44 |
Louisville Gas And Electric Co [Member] | Demand Side Management [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 2 | 3 |
Louisville Gas And Electric Co [Member] | Asset Retirement Obligations [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 25 | 21 |
Louisville Gas And Electric Co [Member] | Environmental Cost Recovery [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 1 | 2 |
Louisville Gas And Electric Co [Member] | Other Regulatory Assets [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 1 | |
Noncurrent regulatory assets | 3 | 5 |
Kentucky Utilities Co [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 3 | 10 |
Noncurrent regulatory assets | 165 | 171 |
Kentucky Utilities Co [Member] | Defined Benefit Plans [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 79 | 88 |
Kentucky Utilities Co [Member] | Storm Costs [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 39 | 43 |
Kentucky Utilities Co [Member] | Unamortized Loss On Debt [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 9 | 10 |
Kentucky Utilities Co [Member] | Demand Side Management [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 1 | 5 |
Kentucky Utilities Co [Member] | Asset Retirement Obligations [Member]
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Regulatory Assets [Line Items] | ||
Noncurrent regulatory assets | 33 | 23 |
Kentucky Utilities Co [Member] | Environmental Cost Recovery [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 5 | |
Kentucky Utilities Co [Member] | Other Regulatory Assets [Member]
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Regulatory Assets [Line Items] | ||
Current regulatory assets | 2 | |
Noncurrent regulatory assets | $ 5 | $ 7 |