Utility Rate Regulation (Details) (USD $) In Millions, unless otherwise specified
|
6 Months Ended |
|
Jun. 30, 2012
MW
Integer
|
Dec. 31, 2011
|
Regulatory Assets [Line Items] |
|
|
|
|
Current regulatory assets |
$ 17 |
|
$ 9 |
|
Noncurrent regulatory assets |
1,335 |
|
1,349 |
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
58 |
|
73 |
|
Noncurrent regulatory liabilities |
1,003 |
|
1,010 |
|
Regulatory Matters - Kentucky Activities - Certificate of Public Convenience and Necessity Filing (Numeric) [Abstract] |
|
|
|
|
Capacity of proposed NGCC (in MW) |
640 |
|
|
|
LG&E undivided ownership interest in proposed combined cycle turbine |
22.00% |
|
|
|
KU undivided ownership interest in proposed combined cycle turbine |
78.00% |
|
|
|
Generating units anticipated to be retired at the Cane Run plant |
3 |
|
|
|
Generating units anticipated to be retired at the Tyrone plant |
1 |
|
|
|
Generating units anticipated to be retired at the Green River plant |
2 |
|
|
|
Capacity of coal-fired generation units that the company anticipates retiring in 2015 (in MW) |
797 |
|
|
|
Regulatory Matters - Kentucky Activities - Kentucky Acquisition Commitments (Numeric) [Abstract] |
|
|
|
|
Rate of return on common equity if exceeded triggers costs savings being returned to customers |
10.75% |
|
|
|
Percentage of excess return on equity amount that ultimately will be returned to customers |
50.00% |
|
|
|
Regulatory Matters - Pennsylvania Activities - PUC Investigation of Retail Market (Numeric) [Abstract] |
|
|
|
|
Number of phases of a PUC investigation of retail electricity market |
2 |
|
|
|
Number of possible models for the default service end state |
3 |
|
|
|
Regulatory Matters - Pennsylvania Activities - Legislation - Regulatory Procedures and Mechanisms (Numeric) [Abstract] |
|
|
|
|
Number of ratemaking mechanisms authorized for PUC approval |
2 |
|
|
|
Regulatory Matters - Pennsylvania Activities - Act 129 (Numeric) [Abstract] |
|
|
|
|
Under Act 129, percentage reduction in electricity consumption by 2011 |
1.00% |
|
|
|
Under Act 129, percentage reduction in electricity consumption by 2013 |
3.00% |
|
|
|
Under Act 129, percentage reduction in peak demand electricity consumption by 2013 |
4.50% |
|
|
|
Number of hours that are the benchmark for demand reductions by 2013 |
100 |
|
|
|
Under Act 129, percentage cap on costs that can be recovered for implementation of EE and C plan |
2.00% |
|
|
|
Number of years EDCs have to comply with consumption reduction target |
3 |
|
|
|
Under Act 129, percentage reduction in electricity target for the company under the Phase II program |
2.10% |
|
|
|
Minimum term of long term supply contract under Act 129 (in years) |
4 |
|
|
|
Maximum term of long term supply contract under Act 129 (in years) |
20 |
|
|
|
Maximum percentage of long-term contracts that can be included in the mix of PLR supply contracts under Act 129 |
25.00% |
|
|
|
Regulatory Matters - Federal Matters - FERC Formula Rates (Numeric) [Abstract] |
|
|
|
|
Review and challenge period for 2012 Annual Update (in days) |
180 |
|
|
|
Requested recovery period (in years) |
34 |
|
|
|
Regulatory asset amount recorded related to certain deferred state tax assets |
50 |
|
50 |
|
Regulatory Matters - U.K. Activities - Ofgem Review of Line Loss Calculation (Numeric) [Abstract] |
|
|
|
|
WPD's projected cost for compliance with overhead electricity standards |
167 |
|
170 |
|
Number of potential changes cited in a consultation paper issued by Ofgem |
2 |
|
|
|
PPL Electric [Member]
|
|
|
|
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Return on equity request included in rate case |
11.25% |
|
|
|
PPL Electric [Member] | Distribution Rates [Member]
|
|
|
|
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Dollar amount of requested increase (decrease) to rates |
105 |
|
|
|
Percentage increase (decrease) to rates |
2.90% |
|
|
|
LGE [Member]
|
|
|
|
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Return on equity request included in rate case |
11.00% |
|
|
|
LGE [Member] | Electric Rates [Member]
|
|
|
|
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Dollar amount of requested increase (decrease) to rates |
62 |
|
|
|
Percentage increase (decrease) to rates |
6.90% |
|
|
|
LGE [Member] | Gas Rates [Member]
|
|
|
|
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Dollar amount of requested increase (decrease) to rates |
17 |
|
|
|
Percentage increase (decrease) to rates |
7.00% |
|
|
|
KU [Member]
|
|
|
|
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Return on equity request included in rate case |
11.00% |
|
|
|
KU [Member] | Electric Rates [Member]
|
|
|
|
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Dollar amount of requested increase (decrease) to rates |
82 |
|
|
|
Percentage increase (decrease) to rates |
6.50% |
|
|
|
Generation Supply Charge [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
21 |
|
42 |
|
Environmental Cost Recovery [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
9 |
|
7 |
|
Gas Supply Clause [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
5 |
|
6 |
|
Transmission Service Charge [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
4 |
|
2 |
|
Transmission Formula Rate [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
7 |
|
0 |
|
Universal Service Rider [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
7 |
|
0 |
|
Accumulated Cost Of Removal Of Utility Plant [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
666 |
|
651 |
|
Coal Contracts [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
161 |
[1] |
180 |
[1] |
Power Purchase Agreement OVEC [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
112 |
[1] |
116 |
[1] |
Net Deferred Tax Assets [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
37 |
|
39 |
|
Act 129 Compliance Rider [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
9 |
|
7 |
|
Defined Benefit Plans [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
10 |
|
9 |
|
Other Regulatory Liabilities [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
5 |
|
16 |
|
Noncurrent regulatory liabilities |
8 |
|
8 |
|
Gas Supply Clause [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Current regulatory assets |
7 |
|
6 |
|
Fuel Adjustment Clause [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Current regulatory assets |
10 |
|
3 |
|
Defined Benefit Plans [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
595 |
|
615 |
|
Taxes Recoverable Through Future Rates [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
297 |
|
289 |
|
Storm Costs [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
148 |
|
154 |
|
Unamortized Loss On Debt [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
103 |
|
110 |
|
Interest Rate Swaps [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
71 |
|
69 |
|
Accumulated Cost Of Removal Of Utility Plant [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
62 |
|
53 |
|
Coal Contracts [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
7 |
[1] |
11 |
[1] |
Asset Retirement Obligations [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
23 |
|
18 |
|
Other Regulatory Assets [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
29 |
|
30 |
|
PPL Electric Utilities Corp [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
734 |
|
729 |
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
42 |
|
53 |
|
Noncurrent regulatory liabilities |
9 |
|
7 |
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Return on equity request included in rate case |
11.25% |
|
|
|
Regulatory Matters - Pennsylvania Activities - PUC Investigation of Retail Market (Numeric) [Abstract] |
|
|
|
|
Number of phases of a PUC investigation of retail electricity market |
2 |
|
|
|
Number of possible models for the default service end state |
3 |
|
|
|
Regulatory Matters - Pennsylvania Activities - Legislation - Regulatory Procedures and Mechanisms (Numeric) [Abstract] |
|
|
|
|
Number of ratemaking mechanisms authorized for PUC approval |
2 |
|
|
|
Regulatory Matters - Pennsylvania Activities - Act 129 (Numeric) [Abstract] |
|
|
|
|
Under Act 129, percentage reduction in electricity consumption by 2011 |
1.00% |
|
|
|
Under Act 129, percentage reduction in electricity consumption by 2013 |
3.00% |
|
|
|
Under Act 129, percentage reduction in peak demand electricity consumption by 2013 |
4.50% |
|
|
|
Number of hours that are the benchmark for demand reductions by 2013 |
100 |
|
|
|
Under Act 129, percentage cap on costs that can be recovered for implementation of EE and C plan |
2.00% |
|
|
|
Number of years EDCs have to comply with consumption reduction target |
3 |
|
|
|
Under Act 129, percentage reduction in electricity target for the company under the Phase II program |
2.10% |
|
|
|
Minimum term of long term supply contract under Act 129 (in years) |
4 |
|
|
|
Maximum term of long term supply contract under Act 129 (in years) |
20 |
|
|
|
Maximum percentage of long-term contracts that can be included in the mix of PLR supply contracts under Act 129 |
25.00% |
|
|
|
Regulatory Matters - Federal Matters - FERC Formula Rates (Numeric) [Abstract] |
|
|
|
|
Review and challenge period for 2012 Annual Update (in days) |
180 |
|
|
|
Requested recovery period (in years) |
34 |
|
|
|
Regulatory asset amount recorded related to certain deferred state tax assets |
50 |
|
50 |
|
PPL Electric Utilities Corp [Member] | Distribution Rates [Member]
|
|
|
|
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Dollar amount of requested increase (decrease) to rates |
105 |
|
|
|
Percentage increase (decrease) to rates |
2.90% |
|
|
|
PPL Electric Utilities Corp [Member] | Generation Supply Charge [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
21 |
|
42 |
|
PPL Electric Utilities Corp [Member] | Transmission Service Charge [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
4 |
|
2 |
|
PPL Electric Utilities Corp [Member] | Transmission Formula Rate [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
7 |
|
0 |
|
PPL Electric Utilities Corp [Member] | Universal Service Rider [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
7 |
|
0 |
|
PPL Electric Utilities Corp [Member] | Act 129 Compliance Rider [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
9 |
|
7 |
|
PPL Electric Utilities Corp [Member] | Other Regulatory Liabilities [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
3 |
|
9 |
|
PPL Electric Utilities Corp [Member] | Defined Benefit Plans [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
270 |
|
276 |
|
PPL Electric Utilities Corp [Member] | Taxes Recoverable Through Future Rates [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
297 |
|
289 |
|
PPL Electric Utilities Corp [Member] | Storm Costs [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
32 |
|
31 |
|
PPL Electric Utilities Corp [Member] | Unamortized Loss On Debt [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
71 |
|
77 |
|
PPL Electric Utilities Corp [Member] | Accumulated Cost Of Removal Of Utility Plant [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
62 |
|
53 |
|
PPL Electric Utilities Corp [Member] | Other Regulatory Assets [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
2 |
|
3 |
|
LG And E And KU Energy LLC [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Current regulatory assets |
17 |
|
9 |
|
Noncurrent regulatory assets |
601 |
|
620 |
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
16 |
|
20 |
|
Noncurrent regulatory liabilities |
994 |
|
1,003 |
|
Regulatory Matters - Kentucky Activities - Certificate of Public Convenience and Necessity Filing (Numeric) [Abstract] |
|
|
|
|
Capacity of proposed NGCC (in MW) |
640 |
|
|
|
LG&E undivided ownership interest in proposed combined cycle turbine |
22.00% |
|
|
|
KU undivided ownership interest in proposed combined cycle turbine |
78.00% |
|
|
|
Generating units anticipated to be retired at the Cane Run plant |
3 |
|
|
|
Generating units anticipated to be retired at the Tyrone plant |
1 |
|
|
|
Generating units anticipated to be retired at the Green River plant |
2 |
|
|
|
Capacity of coal-fired generation units that the company anticipates retiring in 2015 (in MW) |
797 |
|
|
|
Regulatory Matters - Kentucky Activities - Kentucky Acquisition Commitments (Numeric) [Abstract] |
|
|
|
|
Rate of return on common equity if exceeded triggers costs savings being returned to customers |
10.75% |
|
|
|
Percentage of excess return on equity amount that ultimately will be returned to customers |
50.00% |
|
|
|
LG And E And KU Energy LLC [Member] | LGE [Member]
|
|
|
|
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Return on equity request included in rate case |
11.00% |
|
|
|
LG And E And KU Energy LLC [Member] | LGE [Member] | Electric Rates [Member]
|
|
|
|
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Dollar amount of requested increase (decrease) to rates |
62 |
|
|
|
Percentage increase (decrease) to rates |
6.90% |
|
|
|
LG And E And KU Energy LLC [Member] | LGE [Member] | Gas Rates [Member]
|
|
|
|
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Dollar amount of requested increase (decrease) to rates |
17 |
|
|
|
Percentage increase (decrease) to rates |
7.00% |
|
|
|
LG And E And KU Energy LLC [Member] | KU [Member]
|
|
|
|
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Return on equity request included in rate case |
11.00% |
|
|
|
LG And E And KU Energy LLC [Member] | KU [Member] | Electric Rates [Member]
|
|
|
|
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Dollar amount of requested increase (decrease) to rates |
82 |
|
|
|
Percentage increase (decrease) to rates |
6.50% |
|
|
|
LG And E And KU Energy LLC [Member] | Environmental Cost Recovery [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
9 |
|
7 |
|
LG And E And KU Energy LLC [Member] | Gas Supply Clause [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
5 |
|
6 |
|
LG And E And KU Energy LLC [Member] | Accumulated Cost Of Removal Of Utility Plant [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
666 |
|
651 |
|
LG And E And KU Energy LLC [Member] | Coal Contracts [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
161 |
[1] |
180 |
[1] |
LG And E And KU Energy LLC [Member] | Power Purchase Agreement OVEC [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
112 |
[1] |
116 |
[1] |
LG And E And KU Energy LLC [Member] | Net Deferred Tax Assets [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
37 |
|
39 |
|
LG And E And KU Energy LLC [Member] | Defined Benefit Plans [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
10 |
|
9 |
|
LG And E And KU Energy LLC [Member] | Other Regulatory Liabilities [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
2 |
|
7 |
|
Noncurrent regulatory liabilities |
8 |
|
8 |
|
LG And E And KU Energy LLC [Member] | Gas Supply Clause [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Current regulatory assets |
7 |
|
6 |
|
LG And E And KU Energy LLC [Member] | Fuel Adjustment Clause [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Current regulatory assets |
10 |
|
3 |
|
LG And E And KU Energy LLC [Member] | Defined Benefit Plans [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
325 |
|
339 |
|
LG And E And KU Energy LLC [Member] | Storm Costs [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
116 |
|
123 |
|
LG And E And KU Energy LLC [Member] | Unamortized Loss On Debt [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
32 |
|
33 |
|
LG And E And KU Energy LLC [Member] | Interest Rate Swaps [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
71 |
|
69 |
|
LG And E And KU Energy LLC [Member] | Coal Contracts [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
7 |
[1] |
11 |
[1] |
LG And E And KU Energy LLC [Member] | Asset Retirement Obligations [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
23 |
|
18 |
|
LG And E And KU Energy LLC [Member] | Other Regulatory Assets [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
27 |
|
27 |
|
Louisville Gas And Electric Co [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Current regulatory assets |
13 |
|
9 |
|
Noncurrent regulatory assets |
391 |
|
403 |
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
7 |
|
10 |
|
Noncurrent regulatory liabilities |
472 |
|
478 |
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Return on equity request included in rate case |
11.00% |
|
|
|
Regulatory Matters - Kentucky Activities - Certificate of Public Convenience and Necessity Filing (Numeric) [Abstract] |
|
|
|
|
Capacity of proposed NGCC (in MW) |
640 |
|
|
|
LG&E undivided ownership interest in proposed combined cycle turbine |
22.00% |
|
|
|
Generating units anticipated to be retired at the Cane Run plant |
3 |
|
|
|
Capacity of coal-fired generation units that the company anticipates retiring in 2015 (in MW) |
797 |
|
|
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Regulatory Matters - Kentucky Activities - Kentucky Acquisition Commitments (Numeric) [Abstract] |
|
|
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|
Rate of return on common equity if exceeded triggers costs savings being returned to customers |
10.75% |
|
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|
Percentage of excess return on equity amount that ultimately will be returned to customers |
50.00% |
|
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|
Louisville Gas And Electric Co [Member] | Electric Rates [Member]
|
|
|
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Rate Case Proceeding (Numeric) [Abstract] |
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|
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|
Dollar amount of requested increase (decrease) to rates |
62 |
|
|
|
Percentage increase (decrease) to rates |
6.90% |
|
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|
Louisville Gas And Electric Co [Member] | Gas Rates [Member]
|
|
|
|
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Dollar amount of requested increase (decrease) to rates |
17 |
|
|
|
Percentage increase (decrease) to rates |
7.00% |
|
|
|
Louisville Gas And Electric Co [Member] | Gas Supply Clause [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
5 |
|
6 |
|
Louisville Gas And Electric Co [Member] | Accumulated Cost Of Removal Of Utility Plant [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
291 |
|
286 |
|
Louisville Gas And Electric Co [Member] | Coal Contracts [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
70 |
[1] |
78 |
[1] |
Louisville Gas And Electric Co [Member] | Power Purchase Agreement OVEC [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
78 |
[1] |
80 |
[1] |
Louisville Gas And Electric Co [Member] | Net Deferred Tax Assets [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
30 |
|
31 |
|
Louisville Gas And Electric Co [Member] | Other Regulatory Liabilities [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
2 |
|
4 |
|
Noncurrent regulatory liabilities |
3 |
|
3 |
|
Louisville Gas And Electric Co [Member] | Gas Supply Clause [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Current regulatory assets |
7 |
|
6 |
|
Louisville Gas And Electric Co [Member] | Fuel Adjustment Clause [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Current regulatory assets |
6 |
|
3 |
|
Louisville Gas And Electric Co [Member] | Defined Benefit Plans [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
215 |
|
225 |
|
Louisville Gas And Electric Co [Member] | Storm Costs [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
63 |
|
66 |
|
Louisville Gas And Electric Co [Member] | Unamortized Loss On Debt [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
21 |
|
21 |
|
Louisville Gas And Electric Co [Member] | Interest Rate Swaps [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
71 |
|
69 |
|
Louisville Gas And Electric Co [Member] | Coal Contracts [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
3 |
[1] |
5 |
[1] |
Louisville Gas And Electric Co [Member] | Asset Retirement Obligations [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
12 |
|
11 |
|
Louisville Gas And Electric Co [Member] | Other Regulatory Assets [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
6 |
|
6 |
|
Kentucky Utilities Co [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Current regulatory assets |
4 |
|
0 |
|
Noncurrent regulatory assets |
210 |
|
217 |
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
9 |
|
10 |
|
Noncurrent regulatory liabilities |
522 |
|
525 |
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Return on equity request included in rate case |
11.00% |
|
|
|
Regulatory Matters - Kentucky Activities - Certificate of Public Convenience and Necessity Filing (Numeric) [Abstract] |
|
|
|
|
Capacity of proposed NGCC (in MW) |
640 |
|
|
|
KU undivided ownership interest in proposed combined cycle turbine |
78.00% |
|
|
|
Generating units anticipated to be retired at the Tyrone plant |
1 |
|
|
|
Generating units anticipated to be retired at the Green River plant |
2 |
|
|
|
Capacity of coal-fired generation units that the company anticipates retiring in 2015 (in MW) |
797 |
|
|
|
Regulatory Matters - Kentucky Activities - Kentucky Acquisition Commitments (Numeric) [Abstract] |
|
|
|
|
Rate of return on common equity if exceeded triggers costs savings being returned to customers |
10.75% |
|
|
|
Percentage of excess return on equity amount that ultimately will be returned to customers |
50.00% |
|
|
|
Kentucky Utilities Co [Member] | Electric Rates [Member]
|
|
|
|
|
Rate Case Proceeding (Numeric) [Abstract] |
|
|
|
|
Dollar amount of requested increase (decrease) to rates |
82 |
|
|
|
Percentage increase (decrease) to rates |
6.50% |
|
|
|
Kentucky Utilities Co [Member] | Environmental Cost Recovery [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
9 |
|
7 |
|
Kentucky Utilities Co [Member] | Accumulated Cost Of Removal Of Utility Plant [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
375 |
|
365 |
|
Kentucky Utilities Co [Member] | Coal Contracts [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
91 |
[1] |
102 |
[1] |
Kentucky Utilities Co [Member] | Power Purchase Agreement OVEC [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
34 |
[1] |
36 |
[1] |
Kentucky Utilities Co [Member] | Net Deferred Tax Assets [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
7 |
|
8 |
|
Kentucky Utilities Co [Member] | Defined Benefit Plans [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Noncurrent regulatory liabilities |
10 |
|
9 |
|
Kentucky Utilities Co [Member] | Other Regulatory Liabilities [Member]
|
|
|
|
|
Regulatory Liabilities [Line Items] |
|
|
|
|
Current regulatory liabilities |
0 |
|
3 |
|
Noncurrent regulatory liabilities |
5 |
|
5 |
|
Kentucky Utilities Co [Member] | Fuel Adjustment Clause [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Current regulatory assets |
4 |
|
0 |
|
Kentucky Utilities Co [Member] | Defined Benefit Plans [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
110 |
|
114 |
|
Kentucky Utilities Co [Member] | Storm Costs [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
53 |
|
57 |
|
Kentucky Utilities Co [Member] | Unamortized Loss On Debt [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
11 |
|
12 |
|
Kentucky Utilities Co [Member] | Coal Contracts [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
4 |
[1] |
6 |
[1] |
Kentucky Utilities Co [Member] | Asset Retirement Obligations [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
11 |
|
7 |
|
Kentucky Utilities Co [Member] | Other Regulatory Assets [Member]
|
|
|
|
|
Regulatory Assets [Line Items] |
|
|
|
|
Noncurrent regulatory assets |
$ 21 |
|
$ 21 |
|
|
|