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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Operating Revenues        
Utility $ 1,693 $ 1,675 $ 5,012 $ 4,695
Unregulated retail electric and gas 218 189 620 517
Wholesale energy marketing        
Realized 1,076 907 3,367 2,677
Unrealized economic activity (716) 216 (322) 229
Net energy trading margins (11) (7) 7 14
Energy-related businesses 143 140 380 387
Total Operating Revenues 2,403 3,120 9,064 8,519
Operation        
Fuel 570 603 1,405 1,492
Energy purchases - realized 583 362 2,253 1,467
Energy purchases - unrealized economic activity (569) 176 (420) 49
Other operation and maintenance 650 735 2,095 2,041
Depreciation 278 252 813 697
Taxes, other than income 90 90 268 238
Energy-related businesses 137 135 363 368
Total Operating Expenses 1,739 2,353 6,777 6,352
Operating Income 664 767 2,287 2,167
Other Income (Expense) - net (44) 37 (31) (2)
Other-Than-Temporary Impairments    5 1 6
Interest Expense 248 240 714 678
Income from Continuing Operations Before Income Taxes 372 559 1,541 1,481
Income Taxes 17 110 364 429
Income from Continuing Operations After Income Taxes 355 449 1,177 1,052
Income (Loss) from Discontinued Operations (net of income taxes)       (6) 2
Net Income 355 449 1,171 1,054
Net Income Attributable to Noncontrolling Interests    5 4 13
Net Income Attributable to Shareowners 355 444 1,167 1,041
Amounts Attributable to Shareowners:        
Income from Continuing Operations After Income Taxes 355 444 1,173 1,039
Income (Loss) from Discontinued Operations (net of income taxes)       (6) 2
Net Income 355 444 1,167 1,041
Income from Continuing Operations After Income Taxes Available to PPL Common Shareowners:        
Basic (in dollars per share) $ 0.61 $ 0.76 $ 2.01 $ 1.91
Diluted (in dollars per share) $ 0.61 $ 0.76 $ 2.01 $ 1.91
Net Income Available to PPL Common Shareowners:        
Basic (in dollars per share) $ 0.61 $ 0.76 $ 2.00 $ 1.92
Diluted (in dollars per share) $ 0.61 $ 0.76 $ 2.00 $ 1.91
Dividends Declared Per Share of Common Stock $ 0.36 $ 0.35 $ 1.08 $ 1.05
Weighted-Average Shares of Common Stock Outstanding (in thousands)        
Basic 580,585 577,595 579,847 541,135
Diluted 582,636 578,054 580,930 541,480
PPL Energy Supply LLC [Member]
        
Operating Revenues        
Unregulated retail electric and gas 219 190 623 518
Wholesale energy marketing        
Realized 1,076 907 3,367 2,677
Unrealized economic activity (716) 216 (322) 229
Revenue to affiliates 23 5 61 15
Net energy trading margins (11) (7) 7 14
Energy-related businesses 128 130 336 354
Total Operating Revenues 719 1,441 4,072 3,807
Operation        
Fuel 321 358 728 826
Energy purchases - realized 421 161 1,715 701
Energy purchases - unrealized economic activity (569) 176 (420) 49
Energy purchases from affiliates 1 1 2 3
Other operation and maintenance 220 208 769 741
Depreciation 73 62 206 181
Taxes, other than income 18 18 53 50
Energy-related businesses 125 130 326 350
Total Operating Expenses 610 1,114 3,379 2,901
Operating Income 109 327 693 906
Other Income (Expense) - net 4 2 14 20
Other-Than-Temporary Impairments    5 1 6
Interest Income from Affiliates 1 2 2 6
Interest Expense 43 52 123 150
Income from Continuing Operations Before Income Taxes 71 274 585 776
Income Taxes 16 104 202 305
Income from Continuing Operations After Income Taxes 55 170 383 471
Income (Loss) from Discontinued Operations (net of income taxes)          2
Net Income 55 170 383 473
Net Income Attributable to Noncontrolling Interests 1 1 1 1
Net Income Attributable to Shareowners 54 169 382 472
Amounts Attributable to Shareowners:        
Income from Continuing Operations After Income Taxes 54 169 382 470
Income (Loss) from Discontinued Operations (net of income taxes)          2
Net Income 54 169 382 472
PPL Electric Utilities Corp [Member]
        
Operating Revenues        
Retail electric 443 454 1,303 1,444
Wholesale energy marketing        
Revenue to affiliates 1 1 3 9
Total Operating Revenues 444 455 1,306 1,453
Operation        
Energy purchases - realized 137 171 410 591
Energy purchases from affiliates 23 5 61 15
Other operation and maintenance 148 146 431 402
Depreciation 41 38 119 108
Taxes, other than income 24 26 72 83
Total Operating Expenses 373 386 1,093 1,199
Operating Income 71 69 213 254
Other Income (Expense) - net 3 3 6 4
Interest Expense 25 26 73 74
Income from Continuing Operations Before Income Taxes 49 46 146 184
Income Taxes 16 14 47 56
Net Income 33 [1] 32 [1] 99 [1] 128 [1]
Distributions on Preference Stock    4 4 12
Net Income Available to PPL 33 28 95 116
LG And E And KU Energy LLC [Member]
        
Wholesale energy marketing        
Total Operating Revenues 732 736 2,095 2,140
Operation        
Fuel 249 245 677 666
Energy purchases - realized 27 32 135 179
Other operation and maintenance 186 187 589 566
Depreciation 87 84 259 249
Taxes, other than income 11 10 34 28
Total Operating Expenses 560 558 1,694 1,688
Operating Income 172 178 401 452
Other Income (Expense) - net (4)    (14) (1)
Interest Expense 37 36 112 108
Income from Continuing Operations Before Income Taxes 131 142 275 343
Income Taxes 48 52 89 125
Income from Continuing Operations After Income Taxes 83 90 186 218
Income (Loss) from Discontinued Operations (net of income taxes)    (1) (6) (1)
Net Income 83 [1] 89 [1] 180 [1] 217 [1]
Louisville Gas And Electric Co [Member]
        
Operating Revenues        
Retail electric 324 323 939 974
Wholesale energy marketing        
Revenue to affiliates 9 17 51 61
Total Operating Revenues 333 340 990 1,035
Operation        
Fuel 100 98 281 265
Energy purchases - realized 18 24 110 155
Energy purchases from affiliates 3 7 9 25
Other operation and maintenance 87 91 277 272
Depreciation 38 37 114 110
Taxes, other than income 6 5 17 14
Total Operating Expenses 252 262 808 841
Operating Income 81 78 182 194
Other Income (Expense) - net (3)    (3)   
Interest Expense 10 11 31 34
Income from Continuing Operations Before Income Taxes 68 67 148 160
Income Taxes 25 24 54 58
Net Income 43 [1] 43 [1] 94 [1] 102 [1]
Kentucky Utilities Co [Member]
        
Operating Revenues        
Retail electric 408 413 1,156 1,166
Wholesale energy marketing        
Revenue to affiliates 3 7 9 25
Total Operating Revenues 411 420 1,165 1,191
Operation        
Fuel 149 147 396 401
Energy purchases - realized 9 8 25 24
Energy purchases from affiliates 9 17 51 61
Other operation and maintenance 93 90 286 274
Depreciation 49 47 145 139
Taxes, other than income 5 5 17 14
Total Operating Expenses 314 314 920 913
Operating Income 97 106 245 278
Other Income (Expense) - net 1    (5) 1
Interest Expense 18 18 52 53
Income from Continuing Operations Before Income Taxes 80 88 188 226
Income Taxes 30 32 70 82
Net Income $ 50 [1] $ 56 [1] $ 118 [1] $ 144 [1]
[1] Net income approximates comprehensive income.