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Income Taxes (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Jun. 30, 2012
Integer
Jun. 30, 2011
Jun. 30, 2010
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%     $ 128   $ 104 $ 409 $ 323    
Federal statutory rate     35.00%   35.00% 35.00% 35.00%    
Increase (decrease) due to:                  
State income taxes, net of federal income tax benefit     7   14 32 39    
State valuation allowance adjustments     0   0 0 11 [1]    
Impact of lower U.K. income tax rates     (24) [2]   (11) [2] (45) [2] (19) [2]    
U.S. income tax on foreign earnings - net of foreign tax credit     (1) [3]   (11) [3] 1 [3] (17) [3]    
Federal and state tax reserve adjustments     (4)   (2) (5) (3)    
Foreign tax reserve adjustments     (8) [4]   0 (5) [4] 0    
Federal income tax credits     (3)   (2) (7) (7)    
Amortization of investment tax credit     (3)   (1) (5) (4)    
Depreciation not normalized     (2) [1]   (2) [1] (4) [1] (6) [1]    
State deferred tax rate change     0   0 (11) [5] 0    
Net operating loss carryforward adjustment     (3) [6]   0 (9) [6] 0    
Nondeductible acquisition-related costs     0   8 [7] 0 8 [7]    
Other     1   (1) (4) (6)    
Total increase (decrease)     (40)   (8) (62) (4)    
Total income tax from continuing operations     88   96 347 319    
Bonus depreciation percentage             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% 28.00%  
U.K. Statutory income tax rate reduction 24.00% 26.00%              
U.K. Statutory income tax rate reduction for next year 23.00%                
Tax benefit recorded due to U.K. pension contributions     (7)     (14)      
Decrease to income tax expense from change in accounting estimate that impacts annual effective tax rate     13            
Decrease to income tax expense from change in accounting estimate that impacts annual effective tax rate (in dollars per share)     $ 0.02            
Low end of range of estimated deferred tax benefit due to U.K. rate change 65                
High end of range of estimated deferred tax benefit due to U.K. rate change 75                
Unrecognized Tax Benefits (Details) [Roll Forward]                  
Beginning of period 113 250 121   251 145 251    
Additions based on tax positions of prior years     0   1 4 1    
Reductions based on tax positions of prior years     (4)   0 (31) 0    
Additions based on tax positions related to the current year     0   0 1 0    
Reductions based on tax positions related to the current year     (2)   (1) (2) (2)    
Lapse of applicable statutes of limitations     (2)   (3) (4) (5)    
Effects of foreign currency translation     0   2 0 5    
End of period     113 145 250 113 250   251
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     106     106      
Total unrecognized tax benefits and related effects that, if recognized, would decrease the effective tax rate     36   185 36 185    
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%     10   52 180 176    
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   10 24 27    
State valuation allowance adjustments     0   0 0 6 [8]    
Federal income tax credits     (2)   (1) (6) (6)    
State deferred tax rate change     0   0 (11) [9] 0    
Other     0   (2) (1) (2)    
Total increase (decrease)     (1)   7 6 25    
Total income tax from continuing operations     9   59 186 201    
Bonus depreciation percentage             100.00%    
Unrecognized Tax Benefits (Details) [Roll Forward]                  
Beginning of period     31   28 28 183    
Additions based on tax positions of prior years     0   0 4 0    
Reductions based on tax positions of prior years     0   0 (1) 0    
Derecognize unrecognized tax benefits     0   0 0 (155) [10]    
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%     14   21 34 48    
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 5 7    
Federal and state tax reserve adjustments     (2)   (2) (3) (4)    
Federal and state income tax return adjustments     0   0 0 (2) [11]    
Depreciation not normalized     (3) [11]   (2) [11] (4) [11] (5) [11]    
Other     (1)   (1) (1) (2)    
Total increase (decrease)     (3)   (2) (3) (6)    
Total income tax from continuing operations     11   19 31 42    
Bonus depreciation percentage             100.00%    
Unrecognized Tax Benefits (Details) [Roll Forward]                  
Beginning of period     46   59 73 62    
Reductions based on tax positions of prior years     (1)   0 (27) 0    
Additions based on tax positions related to the current year     0   0 1 0    
Reductions based on tax positions related to the current year     0   0 0 (1)    
Lapse of applicable statutes of limitations     (2)   (3) (4) (5)    
End of period     43   56 43 56    
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     5   10 5 10    
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%     25   23 50 70    
Federal statutory rate     35.00%   35.00% 35.00% 35.00%    
Increase (decrease) due to:                  
State income taxes, net of federal income tax benefit     0   2 2 7    
Amortization of investment tax credit     (1)   (1) (3) (3)    
Net operating loss carryforward adjustment     (3) [12]   0 (9) [12] 0    
Other     (1)   0 1 (1)    
Total increase (decrease)     (5)   1 (9) 3    
Total income tax from continuing operations     20   24 41 73    
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%     14   11 28 33    
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   1 3 3    
Other     (1)   0 (2) (2)    
Total increase (decrease)     0   1 1 1    
Total income tax from continuing operations     14   12 29 34    
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%     17   17 38 48    
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 4 4    
Other     (1)   (1) (2) (2)    
Total increase (decrease)     1   1 2 2    
Total income tax from continuing operations     $ 18   $ 18 $ 40 $ 50    
[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 six months ended June 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 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. The U.K. Finance Act of 2010, enacted in July 2010, reduced the U.K. statutory income tax rate from 28% to 27% effective April 1, 2011.
[3] During the three and six months ended June 30, 2011, PPL recorded a $7 million and $14 million federal income tax benefit related to U.K. pension contributions.
[4] During the three and six months ended June 30, 2012, PPL recorded a tax benefit following resolution of a U.K. tax issue related to interest expense.
[5] During the six months ended June 30, 2012, PPL recorded an adjustment related to state deferred tax liabilities.
[6] During the three and six months ended June 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 six months ended June 30, 2011, PPL recorded non-deductible acquisition-related costs (primarily the U.K. stamp duty tax) associated with its acquisition of WPD Midlands.
[8] 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 six months ended June 30, 2011 related to valuation allowances.
[9] During the six months ended June 30, 2012, PPL Energy Supply recorded an adjustment related to state deferred tax liabilities.
[10] 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.
[11] 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.
[12] During the three and six months ended June 30, 2012, LKE recorded adjustments to deferred taxes related to net operating loss carryforwards based on income tax return adjustments.  The impact of these adjustments was not material to any previously reported financial statements, and is not expected to be material to the financial statements for the full year of 2012.