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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, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Operating Revenues        
Utility $ 1,655 $ 1,605 $ 3,605 $ 3,319
Unregulated retail electric and gas 257 179 494 402
Wholesale energy marketing        
Realized 811 1,083 1,787 2,291
Unrealized economic activity 590 (458) (232) 394
Net energy trading margins    10 (11) 18
Energy-related businesses 137 130 264 237
Total Operating Revenues 3,450 2,549 5,907 6,661
Operation        
Fuel 441 411 970 835
Energy purchases - realized 572 787 1,263 1,670
Energy purchases - unrealized economic activity 479 (442) (155) 149
Other operation and maintenance 698 739 1,374 1,445
Depreciation 286 271 570 535
Taxes, other than income 86 87 182 178
Energy-related businesses 130 124 252 226
Total Operating Expenses 2,692 1,977 4,456 5,038
Operating Income (Loss) 758 572 1,451 1,623
Other Income (Expense) - net 13 30 135 13
Other-Than-Temporary Impairments    1    1
Interest Expense 258 236 509 466
Income (Loss) Before Income Taxes 513 365 1,077 1,169
Income Taxes 109 88 260 347
Income from Continuing Operations After Income Taxes 404 277 817 822
Income (Loss) from Discontinued Operations (net of income taxes) 1 (6) 1 (6)
Net Income 405 271 818 816
Net Income Attributable to Noncontrolling Interests          4
Net Income (Loss) Attributable to Shareowners 405 271 818 812
Amounts Attributable to Shareowners:        
Income from Continuing Operations After Income Taxes 404 277 817 818
Income (Loss) from Discontinued Operations (net of income taxes) 1 (6) 1 (6)
Net Income 405 271 818 812
Earnings Per Share of Common Stock:        
Basic (in dollars per share) $ 0.68 $ 0.46 $ 1.39 $ 1.39
Diluted (in dollars per share) $ 0.63 $ 0.46 $ 1.28 $ 1.39
Dividends Declared Per Share of Common Stock $ 0.3675 $ 0.36 $ 0.735 $ 0.72
Weighted-Average Shares of Common Stock Outstanding (in thousands)        
Basic 589,834 579,881 586,683 579,462
Diluted 664,615 580,593 661,263 580,062
PPL Energy Supply LLC [Member]
        
Operating Revenues        
Unregulated retail electric and gas 257 180 495 404
Wholesale energy marketing        
Realized 811 1,083 1,787 2,291
Unrealized economic activity 590 (458) (232) 394
Revenue to affiliates 12 17 26 38
Net energy trading margins    10 (11) 18
Energy-related businesses 122 112 235 208
Total Operating Revenues 1,792 944 2,300 3,353
Operation        
Fuel 224 196 522 407
Energy purchases - realized 418 635 852 1,294
Energy purchases - unrealized economic activity 479 (442) (155) 149
Energy purchases from affiliates 1    2 1
Other operation and maintenance 270 294 505 549
Depreciation 79 69 157 133
Taxes, other than income 16 17 33 35
Energy-related businesses 118 109 228 201
Total Operating Expenses 1,605 878 2,144 2,769
Operating Income (Loss) 187 66 156 584
Other Income (Expense) - net 12 6 16 11
Other-Than-Temporary Impairments    1    1
Interest Expense 46 43 92 80
Income (Loss) Before Income Taxes 153 28 80 514
Income Taxes 67 9 32 186
Net Income 86 19 48 328
Net Income (Loss) Attributable to Shareowners 86 19 48 328
Amounts Attributable to Shareowners:        
Net Income 86 19 48 328
PPL Electric Utilities Corp [Member]
        
Operating Revenues        
Retail electric 413 403 925 860
Wholesale energy marketing        
Revenue to affiliates 1 1 2 2
Total Operating Revenues 414 404 927 862
Operation        
Energy purchases - realized 120 120 292 273
Energy purchases from affiliates 12 17 26 38
Other operation and maintenance 124 143 257 283
Depreciation 44 39 87 78
Taxes, other than income 22 22 52 48
Total Operating Expenses 322 341 714 720
Operating Income (Loss) 92 63 213 142
Other Income (Expense) - net 2 1 3 3
Interest Expense 25 24 50 48
Income (Loss) Before Income Taxes 69 40 166 97
Income Taxes 24 11 57 31
Net Income 45 [1] 29 [1] 109 [1] 66 [1]
Distributions on Preference Stock          4
Net Income Available to PPL 45 29 109 62
LG And E And KU Energy LLC [Member]
        
Wholesale energy marketing        
Total Operating Revenues 682 658 1,482 1,363
Operation        
Fuel 216 215 447 428
Energy purchases - realized 37 34 123 108
Other operation and maintenance 197 197 394 403
Depreciation 83 86 165 172
Taxes, other than income 12 12 24 23
Total Operating Expenses 545 544 1,153 1,134
Operating Income (Loss) 137 114 329 229
Other Income (Expense) - net    (7) (2) (10)
Interest Expense 36 37 73 75
Interest Expense with Affiliates 1    1   
Income (Loss) Before Income Taxes 100 70 253 144
Income Taxes 37 20 94 41
Income from Continuing Operations After Income Taxes 63 50 159 103
Income (Loss) from Discontinued Operations (net of income taxes) 1 (6) 1 (6)
Net Income 64 [1] 44 [1] 160 [1] 97 [1]
Louisville Gas And Electric Co [Member]
        
Operating Revenues        
Retail electric 302 286 671 615
Wholesale energy marketing        
Revenue to affiliates 14 18 35 42
Total Operating Revenues 316 304 706 657
Operation        
Fuel 88 92 184 181
Energy purchases - realized 31 23 111 92
Energy purchases from affiliates 3 2 4 6
Other operation and maintenance 94 92 185 190
Depreciation 37 38 73 76
Taxes, other than income 6 6 12 11
Total Operating Expenses 259 253 569 556
Operating Income (Loss) 57 51 137 101
Other Income (Expense) - net (1) (1) (2)   
Interest Expense 10 10 20 21
Income (Loss) Before Income Taxes 46 40 115 80
Income Taxes 17 14 42 29
Net Income 29 [2] 26 [2] 73 [2] 51 [2]
Kentucky Utilities Co [Member]
        
Operating Revenues        
Retail electric 380 372 811 748
Wholesale energy marketing        
Revenue to affiliates 3 2 4 6
Total Operating Revenues 383 374 815 754
Operation        
Fuel 128 123 263 247
Energy purchases - realized 6 11 12 16
Energy purchases from affiliates 14 18 35 42
Other operation and maintenance 98 98 195 193
Depreciation 46 48 92 96
Taxes, other than income 6 6 12 12
Total Operating Expenses 298 304 609 606
Operating Income (Loss) 85 70 206 148
Other Income (Expense) - net 2 (5) 1 (6)
Interest Expense 17 17 34 34
Income (Loss) Before Income Taxes 70 48 173 108
Income Taxes 26 18 65 40
Net Income $ 44 [1] $ 30 [1] $ 108 [1] $ 68 [1]
[1] Net income approximates comprehensive income.
[2] Net income equals comprehensive income.