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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Operating Revenues        
Utility $ 1,605 $ 1,484 $ 3,319 $ 3,020
Unregulated retail electric and gas 179 181 402 328
Wholesale energy marketing        
Realized 1,083 732 2,291 1,770
Unrealized economic activity (458) (44) 394 13
Net energy trading margins 10 10 18 21
Energy-related businesses 130 126 237 247
Total Operating Revenues 2,549 2,489 6,661 5,399
Operation        
Fuel 411 414 835 889
Energy purchases - realized 787 434 1,670 1,105
Energy purchases - unrealized economic activity (442) (109) 149 (127)
Other operation and maintenance 739 723 1,445 1,306
Depreciation 271 237 535 445
Taxes, other than income 87 75 178 148
Energy-related businesses 124 120 226 233
Total Operating Expenses 1,977 1,894 5,038 3,999
Operating Income 572 595 1,623 1,400
Other Income (Expense) - net 30 (34) 13 (39)
Other-Than-Temporary Impairments 1 0 1 1
Interest Expense 236 264 466 438
Income from Continuing Operations Before Income Taxes 365 297 1,169 922
Income Taxes 88 96 347 319
Income from Continuing Operations After Income Taxes 277 201 822 603
Income (Loss) from Discontinued Operations (net of income taxes) (6) (1) (6) 2
Net Income 271 200 816 605
Net Income Attributable to Noncontrolling Interests 0 4 4 8
Net Income Attributable to Company 271 196 812 597
Amounts Attributable to Company:        
Income from Continuing Operations After Income Taxes 277 197 818 595
Income (Loss) from Discontinued Operations (net of income taxes) (6) (1) (6) 2
Net Income 271 196 812 597
Income from Continuing Operations After Income Taxes Available to PPL Corporation Common Shareowners:        
Basic (in dollars per share) $ 0.47 $ 0.35 $ 1.40 $ 1.13
Diluted (in dollars per share) $ 0.47 $ 0.35 $ 1.40 $ 1.13
Net Income Available to PPL Corporation Common Shareowners:        
Basic (in dollars per share) $ 0.46 $ 0.35 $ 1.39 $ 1.14
Diluted (in dollars per share) $ 0.46 $ 0.35 $ 1.39 $ 1.14
Dividends Declared Per Share of Common Stock $ 0.36 $ 0.35 $ 0.72 $ 0.70
Weighted-Average Shares of Common Stock Outstanding (in thousands)        
Basic 579,881 561,652 579,462 522,897
Diluted 580,593 562,019 580,062 523,184
PPL Energy Supply LLC [Member]
        
Operating Revenues        
Unregulated retail electric and gas 180 181 404 328
Wholesale energy marketing        
Realized 1,083 732 2,291 1,770
Unrealized economic activity (458) (44) 394 13
Wholesale energy marketing to affiliates 17 4 38 10
Net energy trading margins 10 10 18 21
Energy-related businesses 112 114 208 224
Total Operating Revenues 944 997 3,353 2,366
Operation        
Fuel 196 208 407 468
Energy purchases - realized 635 226 1,294 540
Energy purchases - unrealized economic activity (442) (109) 149 (127)
Energy purchases from affiliates 0 1 1 2
Other operation and maintenance 294 288 549 533
Depreciation 69 60 133 119
Taxes, other than income 17 16 35 32
Energy-related businesses 109 112 201 220
Total Operating Expenses 878 802 2,769 1,787
Operating Income 66 195 584 579
Other Income (Expense) - net 5 4 10 18
Other-Than-Temporary Impairments 1 0 1 1
Interest Income from Affiliates 1 1 1 4
Interest Expense 43 51 80 98
Income from Continuing Operations Before Income Taxes 28 149 514 502
Income Taxes 9 59 186 201
Income from Continuing Operations After Income Taxes 19 90 328 301
Income (Loss) from Discontinued Operations (net of income taxes) 0 (1) 0 2
Net Income 19 89 328 303
Net Income Attributable to Company 19 89 328 303
Amounts Attributable to Company:        
Net Income 19 89 328 303
PPL Electric Utilities Corp [Member]
        
Operating Revenues        
Retail electric 403 436 860 990
Wholesale energy marketing        
Electric revenue from affiliates 1 4 2 8
Total Operating Revenues 404 440 862 998
Operation        
Energy purchases - realized 120 169 273 420
Energy purchases from affiliates 17 4 38 10
Other operation and maintenance 143 126 283 256
Depreciation 39 37 78 70
Taxes, other than income 22 22 48 57
Total Operating Expenses 341 358 720 813
Operating Income 63 82 142 185
Other Income (Expense) - net 1 1 3 1
Interest Expense 24 24 48 48
Income from Continuing Operations Before Income Taxes 40 59 97 138
Income Taxes 11 19 31 42
Net Income 29 [1] 40 [1] 66 [1] 96 [1]
Distribution on Preferred Securities 0 4 4 8
Net Income Available to PPL Corporation 29 36 62 88
LG And E And KU Energy LLC [Member]
        
Wholesale energy marketing        
Total Operating Revenues 658 638 1,363 1,404
Operation        
Fuel 215 206 428 421
Energy purchases - realized 34 40 108 147
Other operation and maintenance 197 198 403 379
Depreciation 86 84 172 165
Taxes, other than income 12 9 23 18
Total Operating Expenses 544 537 1,134 1,130
Operating Income 114 101 229 274
Other Income (Expense) - net (7) 0 (10) (1)
Interest Expense 37 36 75 72
Income from Continuing Operations Before Income Taxes 70 65 144 201
Income Taxes 20 24 41 73
Income from Continuing Operations After Income Taxes 50 41 103 128
Income (Loss) from Discontinued Operations (net of income taxes) (6) 0 (6) 0
Net Income 44 [1] 41 [1] 97 [1] 128 [1]
Louisville Gas And Electric Co [Member]
        
Operating Revenues        
Retail electric 286 280 615 651
Wholesale energy marketing        
Electric revenue from affiliates 18 17 42 44
Total Operating Revenues 304 297 657 695
Operation        
Fuel 92 82 181 167
Energy purchases - realized 23 32 92 131
Energy purchases from affiliates 2 7 6 18
Other operation and maintenance 92 91 190 181
Depreciation 38 37 76 73
Taxes, other than income 6 5 11 9
Total Operating Expenses 253 254 556 579
Operating Income 51 43 101 116
Other Income (Expense) - net (1) 1 0 0
Interest Expense 10 12 21 23
Income from Continuing Operations Before Income Taxes 40 32 80 93
Income Taxes 14 12 29 34
Net Income 26 [1] 20 [1] 51 [1] 59 [1]
Kentucky Utilities Co [Member]
        
Operating Revenues        
Retail electric 372 358 748 753
Wholesale energy marketing        
Electric revenue from affiliates 2 7 6 18
Total Operating Revenues 374 365 754 771
Operation        
Fuel 123 124 247 254
Energy purchases - realized 11 8 16 16
Energy purchases from affiliates 18 17 42 44
Other operation and maintenance 98 100 193 184
Depreciation 48 47 96 92
Taxes, other than income 6 4 12 9
Total Operating Expenses 304 300 606 599
Operating Income 70 65 148 172
Other Income (Expense) - net (5) 0 (6) 1
Interest Expense 17 17 34 35
Income from Continuing Operations Before Income Taxes 48 48 108 138
Income Taxes 18 18 40 50
Net Income $ 30 [1] $ 30 [1] $ 68 [1] $ 88 [1]
[1] Net income approximates comprehensive income.