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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Integer
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of Income Tax Expense            
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35% $ 130 $ 196 $ 539 $ 518    
Federal statutory rate 35.00% 35.00% 35.00% 35.00%    
Increase (decrease) due to:            
State income taxes, net of federal income tax benefit 6 8 38 47    
State valuation allowance adjustments 2 [1]    2 [1] 11 [1]    
Impact of lower U.K. income tax rates (30) [2] (12) [2] (75) [2] (31) [2]    
U.S. income tax on foreign earnings - net of foreign tax credit 1 (10) [3] 2 (25) [3]    
Federal and state tax reserve adjustments (2) 4 (7) 1    
Foreign tax reserve adjustments    2 (5) [4] 2    
Federal income tax credits (5) (4) (12) (11)    
Amortization of investment tax credit (2) (2) (7) (6)    
Depreciation not normalized (2) [1] (1) [1] (6) [1] (7) [1]    
State deferred tax rate change (6) [5]    (17) [5]       
Net operating loss carryforward adjustments       (9) [6]       
Enactment of the U.K.'s Finance Act of 2012 and 2011 (74) [2] (69) [2] (74) [2] (69) [2]    
Nondeductible acquisition-related costs    1 [7]    9 [7]    
Other (1) (3) (5) (10)    
Total increase (decrease) (113) (86) (175) (89)    
Total income tax from continuing operations 17 110 364 429    
Bonus depreciation percentage     100.00% 100.00%    
Minimum property value for extended deadline for bonus depreciation     1      
Minimum production period extended deadline for bonus depreciation (in years)     1      
Minimum tax life for extended deadline for bonus depreciation (in years)     10      
U.K. statutory income tax rate in effect during period prior to a change     25.00% 27.00%    
U.K. Statutory income tax rate reduction     24.00% 26.00%    
U.K. Statutory income tax rate reduction for next year     23.00% 25.00%    
Tax benefit recorded due to U.K. pension contributions   (7)   (21)    
Unrecognized Tax Benefits (Details) [Roll Forward]            
Beginning of period 113 250 145 251 251  
Additions based on tax positions of prior years 2 1 6 2    
Reductions based on tax positions of prior years    (14) (31) (14)    
Additions based on tax positions related to the current year    4    4    
Reductions based on tax positions related to the current year (1) (1) (2) (3)    
Lapse of applicable statutes of limitations (2) (3) (6) (8)    
Effects of foreign currency translation    (2)    3    
End of period 112 235 [8] 112 235 [8] 145 251
Unrecognized Tax Benefits - Foreign Capital Losses (Numeric) [Abstract]            
U.K. capital losses included in unrecognized tax benefits to be reversed in next quarter   146   146    
Unrecognized Tax Benefits - Probable Increase (Decrease) Next 12 Months (Details) [Abstract]            
Total amount unrecognized tax benefits may increase in next 12 months 21   21      
Total amount unrecognized tax benefits may decrease in next 12 months 105   105      
Total unrecognized tax benefits and related effects that, if recognized, would decrease the effective tax rate 34 172 34 172    
Tax Litigation (Numeric) [Abstract]            
Benefit from favorable U.S. Tax Court decision on deductibility of U.K. windfall profit tax           (42)
Expense from reversal by U.S. Court of Appeals for the Third Circuit on deductibility of U.K. windfall profit tax         39  
PPL Energy Supply LLC [Member]
            
Reconciliation of Income Tax Expense            
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35% 25 96 205 272    
Federal statutory rate 35.00% 35.00% 35.00% 35.00%    
Increase (decrease) due to:            
State income taxes, net of federal income tax benefit 1 11 25 38    
State valuation allowance adjustments 2    2 6 [9]    
Federal and state tax reserve adjustments    1    2    
Federal income tax credits (4) (5) (10) (11)    
State deferred tax rate change (6) [10]    (17) [10]       
Other (2) 1 (3) (2)    
Total increase (decrease) (9) 8 (3) 33    
Total income tax from continuing operations 16 104 202 305    
Bonus depreciation percentage     100.00% 100.00%    
Unrecognized Tax Benefits (Details) [Roll Forward]            
Beginning of period 31 28 28 183 183  
Additions based on tax positions of prior years       4       
Reductions based on tax positions of prior years       1       
Derecognize unrecognized tax benefits          (155) [11]    
End of period 31 28 31 28    
Unrecognized Tax Benefits - Probable Increase (Decrease) Next 12 Months (Details) [Abstract]            
Total amount unrecognized tax benefits may increase in next 12 months 1   1      
Total amount unrecognized tax benefits may decrease in next 12 months 31   31      
Total unrecognized tax benefits and related effects that, if recognized, would decrease the effective tax rate 14 12 14 12    
PPL Electric Utilities Corp [Member]
            
Reconciliation of Income Tax Expense            
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35% 17 16 51 64    
Federal statutory rate 35.00% 35.00% 35.00% 35.00%    
Increase (decrease) due to:            
State income taxes, net of federal income tax benefit 2 2 7 9    
Federal and state tax reserve adjustments (2) (2) (5) (6)    
Federal and state income tax return adjustments          (2) [12]    
Depreciation not normalized (1) [12] (1) [12] (5) [12] (6) [12]    
Other    (1) (1) (3)    
Total increase (decrease) (1) (2) (4) (8)    
Total income tax from continuing operations 16 14 47 56    
Bonus depreciation percentage     100.00% 100.00%    
Unrecognized Tax Benefits (Details) [Roll Forward]            
Beginning of period 43 56 73 62 62  
Reductions based on tax positions of prior years 1    28       
Additions based on tax positions related to the current year       1       
Reductions based on tax positions related to the current year          1    
Lapse of applicable statutes of limitations 2 3 6 8    
End of period 40 53 40 53    
Unrecognized Tax Benefits - Probable Increase (Decrease) Next 12 Months (Details) [Abstract]            
Total amount unrecognized tax benefits may increase in next 12 months 22   22      
Total amount unrecognized tax benefits may decrease in next 12 months 38   38      
Total unrecognized tax benefits and related effects that, if recognized, would decrease the effective tax rate 4 9 4 9    
LG And E And KU Energy LLC [Member]
            
Reconciliation of Income Tax Expense            
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35% 46 50 96 120    
Federal statutory rate 35.00% 35.00% 35.00% 35.00%    
Increase (decrease) due to:            
State income taxes, net of federal income tax benefit 5 4 7 11    
Amortization of investment tax credit (1) (1) (4) (4)    
Net operating loss carryforward adjustments       (9) [13]       
Other (2) (1) (1) (2)    
Total increase (decrease) 2 2 (7) 5    
Total income tax from continuing operations 48 52 89 125    
Louisville Gas And Electric Co [Member]
            
Reconciliation of Income Tax Expense            
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35% 24 23 52 56    
Federal statutory rate 35.00% 35.00% 35.00% 35.00%    
Increase (decrease) due to:            
State income taxes, net of federal income tax benefit 2 2 5 5    
Other (1) (1) (3) (3)    
Total increase (decrease) 1 1 2 2    
Total income tax from continuing operations 25 24 54 58    
Kentucky Utilities Co [Member]
            
Reconciliation of Income Tax Expense            
Federal income tax on Income (Loss) from Continuing Operations Before Income Taxes at statutory tax rate - 35% 28 31 66 79    
Federal statutory rate 35.00% 35.00% 35.00% 35.00%    
Increase (decrease) due to:            
State income taxes, net of federal income tax benefit 3 3 6 7    
Other (1) (2) (2) (4)    
Total increase (decrease) 2 1 4 3    
Total income tax from continuing operations $ 30 $ 32 $ 70 $ 82    
[1] In February 2011, the Pennsylvania Department of Revenue issued interpretive guidance on the treatment of bonus depreciation for Pennsylvania income tax purposes. In accordance with Corporation Tax Bulletin 2011-01, Pennsylvania allows 100% bonus depreciation for qualifying assets in the same year bonus depreciation is allowed for federal tax purposes. Due to the decrease in projected taxable income related to bonus depreciation, PPL recorded state deferred income tax expense during the nine months ended September 30, 2011 related to valuation allowances. Additionally, the 100% Pennsylvania bonus depreciation deduction created a current state income tax benefit for the flow-through impact of Pennsylvania regulated state tax depreciation. The federal provision for 100% bonus depreciation generally applies to property placed into service before January 1, 2012. The placed in-service deadline is extended to January 1, 2013 for property that exceeds $1 million, has a production period longer than one year and has a tax life of at least ten years.
[2] The U.K. Finance Act of 2012, enacted in July 2012, reduced the U.K. statutory income tax rate from 25% to 24% retroactive to April 1, 2012 and from 24% to 23% effective April 1, 2013. As a result, PPL reduced its net deferred tax liabilities and recognized a deferred tax benefit in the third quarter of 2012 related to both rate decreases. The U.K. Finance Act of 2011, enacted in July 2011, reduced the U.K. statutory income tax rate from 27% to 26% retroactive to April 1, 2011 and from 26% to 25% effective April 1, 2012. As a result, PPL reduced its net deferred tax liabilities and recognized a deferred tax benefit in the third quarter of 2011 related to both rate decreases.
[3] During the three and nine months ended September 30, 2011, PPL recorded a $7 million and $21 million federal income tax benefit related to U.K. pension contributions.
[4] During the nine months ended September 30, 2012, PPL recorded a tax benefit following resolution of a U.K. tax issue related to interest expense.
[5] During the three and nine months ended September 30, 2012, PPL recorded adjustments related to state deferred tax liabilities.
[6] During the nine months ended September 30, 2012, PPL recorded adjustments to deferred taxes related to net operating loss carryforwards of LKE based on income tax return adjustments.
[7] During the three and nine months ended September 30, 2011, PPL recorded non-deductible acquisition-related costs (primarily the U.K. stamp duty tax) associated with its acquisition of WPD Midlands.
[8] Unrecognized tax benefits at September 30, 2011 included $146 million of U.K. capital losses related to positions previously recorded on U.K. income tax returns. In October 2011, the U.K. tax authority accepted these capital loss positions. As a result, capital loss carryforwards were increased. PPL reversed the unrecognized tax benefit and recorded a deferred tax asset in the fourth quarter of 2011. Simultaneously, PPL recorded a valuation allowance against the deferred tax asset related to the increase in capital loss carryforwards.
[9] In February 2011, the Pennsylvania Department of Revenue issued interpretive guidance on the treatment of bonus depreciation for Pennsylvania income tax purposes. In accordance with Corporation Tax Bulletin 2011-01, Pennsylvania allows 100% bonus depreciation for qualifying assets in the same year bonus depreciation is allowed for federal tax purposes. Due to the decrease in projected taxable income related to bonus depreciation, PPL Energy Supply recorded state deferred income tax expense during the nine months ended September 30, 2011 related to valuation allowances on state net operating loss carryforwards.
[10] During the three and nine months ended September 30, 2012, PPL Energy Supply recorded adjustments related to state deferred tax liabilities.
[11] Represents unrecognized tax benefits derecognized as a result of PPL Energy Supply's distribution of its membership interest in PPL Global to PPL Energy Supply's parent, PPL Energy Funding. See Note 9 in PPL Energy Supply's 2011 Form 10-K for additional information on the distribution.
[12] In February 2011, the Pennsylvania Department of Revenue issued interpretive guidance on the treatment of bonus depreciation for Pennsylvania income tax purposes. In accordance with Corporation Tax Bulletin 2011-01, Pennsylvania allows 100% bonus depreciation for qualifying assets in the same year bonus depreciation is allowed for federal tax purposes. The 100% Pennsylvania bonus depreciation deduction created a current state income tax benefit for the flow-through impact of Pennsylvania regulated state tax depreciation. The federal provision for 100% bonus depreciation generally applies to property placed in service before January 1, 2012.
[13] During the nine months ended September 30, 2012, LKE recorded adjustments to deferred taxes related to net operating loss carryforwards based on income tax return adjustments.