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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($)
shares in Thousands, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Operating Revenues        
Operating Revenues $ 1,848 $ 1,725 $ 3,974 $ 3,676
Operation        
Fuel 189 183 403 374
Energy purchases 148 136 389 351
Other operation and maintenance 506 432 974 902
Depreciation 273 246 542 488
Taxes, other than income 74 70 157 145
Total Operating Expenses 1,190 1,067 2,465 2,260
Operating Income 658 658 1,509 1,416
Other Income (Expense) - net 234 (68) 191 (77)
Interest Expense 235 222 474 439
Income Before Income Taxes 657 368 1,226 900
Income Taxes 142 76 259 205
Net Income $ 515 $ 292 $ 967 $ 695
Net Income:        
Basic (in dollars per share) $ 0.74 $ 0.43 $ 1.39 $ 1.02
Diluted (in dollars per share) 0.73 0.43 1.38 1.01
Dividends Declared Per Share of Common Stock (in dollars per share) $ 0.41 $ 0.395 $ 0.82 $ 0.79
Weighted-Average Shares of Common Stock Outstanding (in thousands)        
Basic (in shares) 699,006 683,841 696,772 682,370
Diluted (in shares) 700,976 686,351 698,161 684,725
PPL Electric Utilities Corp [Member]        
Operating Revenues        
Operating Revenues $ 517 $ 500 $ 1,156 $ 1,073
Operation        
Energy purchases 115 107 276 253
Other operation and maintenance 159 139 292 302
Depreciation 88 76 173 151
Taxes, other than income 22 23 54 52
Total Operating Expenses 384 345 795 758
Operating Income 133 155 361 315
Other Income (Expense) - net 7 4 13 4
Interest Income from Affiliate 1 1 1 1
Interest Expense 39 36 76 69
Income Before Income Taxes 102 124 299 251
Income Taxes 27 47 76 95
Net Income [1] 75 77 223 156
LG And E And KU Energy LLC [Member]        
Operating Revenues        
Operating Revenues 743 723 1,615 1,532
Operation        
Fuel 189 183 403 374
Energy purchases 33 29 113 98
Other operation and maintenance 211 192 416 397
Depreciation 118 105 235 210
Taxes, other than income 18 16 35 32
Total Operating Expenses 569 525 1,202 1,111
Operating Income 174 198 413 421
Other Income (Expense) - net 1 (4) (2) (8)
Interest Expense 52 50 102 99
Interest Expense with Affiliate 6 4 11 8
Income Before Income Taxes 117 140 298 306
Income Taxes 31 53 70 116
Net Income 86 87 228 [2] 190 [2]
Louisville Gas And Electric Co [Member]        
Operating Revenues        
Retail and wholesale 331 320 738 694
Electric revenue from affiliate 4 4 16 21
Operating Revenues 335 324 754 715
Operation        
Fuel 72 69 151 149
Energy purchases 28 25 104 89
Energy purchases from affiliate 2 3 8 5
Other operation and maintenance 93 86 182 171
Depreciation 49 45 97 89
Taxes, other than income 9 9 18 17
Total Operating Expenses 253 237 560 520
Operating Income 82 87 194 195
Other Income (Expense) - net (1) 1 (2) (3)
Interest Expense 19 19 37 36
Income Before Income Taxes 62 69 155 156
Income Taxes 12 27 33 60
Net Income [1] 50 42 122 96
Kentucky Utilities Co [Member]        
Operating Revenues        
Retail and wholesale 412 403 877 838
Electric revenue from affiliate 2 3 8 5
Operating Revenues 414 406 885 843
Operation        
Fuel 117 114 252 225
Energy purchases 5 4 9 9
Energy purchases from affiliate 4 4 16 21
Other operation and maintenance 112 100 217 208
Depreciation 70 61 138 121
Taxes, other than income 9 7 17 15
Total Operating Expenses 317 290 649 599
Operating Income 97 116 236 244
Other Income (Expense) - net 3 (2) 0 (4)
Interest Expense 25 24 50 48
Income Before Income Taxes 75 90 186 192
Income Taxes 14 34 38 73
Net Income [2] $ 61 $ 56 $ 148 $ 119
[1] Net income equals comprehensive income.
[2] Net income approximates comprehensive income.