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Segment and Related Information (Income Statement and Balance Sheet Data) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) Integer | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  | $ 1,926 | $ 1,845 | $ 1,725 | $ 1,951 | $ 1,832 | $ 1,889 | $ 1,785 | $ 2,011 | $ 7,447 |  | $ 7,517 |  | $ 7,669 |
Depreciation |  |  |  |  |  |  |  |  |  | 1,008 |  | 926 |  | 883 |
Amortization |  |  |  |  |  |  |  |  |  | 97 |  | 80 |  | 59 |
Unrealized (gains) losses on derivatives and other hedging activities |  |  |  |  |  |  |  |  |  | 178 |  | 19 |  | (77) |
Interest Expense |  |  |  |  |  |  |  |  |  | 901 |  | 888 |  | 871 |
Income from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 1,912 |  | 2,550 |  | 2,068 |
Income Taxes |  |  |  |  |  |  |  |  |  | 784 |  | 648 |  | 465 |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 707 |  | 560 |  | 428 |
Net income |  | 78 | 355 | 292 | 403 | 465 | 473 | 483 | 481 | 1,128 |  | 1,902 |  | 682 |
Loss from Discontinued Operations (net of income taxes) |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | (921) |
Cash Flow Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  | 3,171 |  | 2,957 |  | 3,570 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 41,479 |  |  |  | 38,315 |  |  |  | $ 41,479 |  | 38,315 |  |  |
Segment Information (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | Integer |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
PPL Energy Supply Spinoff [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss from Discontinued Operations (net of income taxes) |  |  |  |  |  |  |  |  |  |  |  |  |  | (921) |
Gain (loss) on disposal group |  |  |  |  |  |  |  |  |  |  |  |  |  | (879) |
U.K. Regulated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  |  |  |  |  |  |  |  |  | $ 2,091 |  | 2,207 |  | 2,410 |
Depreciation |  |  |  |  |  |  |  |  |  | 230 |  | 233 |  | 242 |
Amortization |  |  |  |  |  |  |  |  |  | 34 |  | 16 |  | 6 |
Unrealized (gains) losses on derivatives and other hedging activities |  |  |  |  |  |  |  |  |  | 166 |  | 13 |  | (88) |
Interest Expense |  |  |  |  |  |  |  |  |  | 397 |  | 402 |  | 417 |
Income from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 804 |  | 1,479 |  | 1,249 |
Income Taxes |  |  |  |  |  |  |  |  |  | 152 |  | 233 |  | 128 |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 66 |  | 31 |  | 45 |
Net income |  |  |  |  |  |  |  |  |  | 652 |  | 1,246 |  | 1,121 |
Cash Flow Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  | 1,015 |  | 1,031 |  | 1,242 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 16,813 |  |  |  | 14,537 |  |  |  | 16,813 |  | 14,537 |  |  |
Segment Information (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation |  | 12,500 |  |  |  | 10,800 |  |  |  | 12,500 |  | 10,800 |  |  |
Kentucky Regulated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  |  |  |  |  |  |  |  |  | 3,156 |  | 3,141 |  | 3,115 |
Depreciation |  |  |  |  |  |  |  |  |  | 439 |  | 404 |  | 382 |
Amortization |  |  |  |  |  |  |  |  |  | 24 |  | 29 |  | 27 |
Unrealized (gains) losses on derivatives and other hedging activities |  |  |  |  |  |  |  |  |  | 6 |  | 6 |  | 11 |
Interest Expense |  |  |  |  |  |  |  |  |  | 261 |  | 260 |  | 232 |
Income from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 645 |  | 640 |  | 547 |
Income Taxes |  |  |  |  |  |  |  |  |  | 359 |  | 242 |  | 221 |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 294 |  | 291 |  | 236 |
Net income |  |  |  |  |  |  |  |  |  | 286 |  | 398 |  | 326 |
Cash Flow Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  | 892 |  | 791 |  | 1,210 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 14,468 |  |  |  | 14,037 |  |  |  | 14,468 |  | 14,037 |  |  |
Pennsylvania Regulated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  |  |  |  |  |  |  |  |  | 2,195 |  | 2,156 |  | 2,124 |
Depreciation |  |  |  |  |  |  |  |  |  | 309 |  | 253 |  | 214 |
Amortization |  |  |  |  |  |  |  |  |  | 33 |  | 32 |  | 26 |
Interest Expense |  |  |  |  |  |  |  |  |  | 142 |  | 129 |  | 130 |
Income from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 575 |  | 550 |  | 416 |
Income Taxes |  |  |  |  |  |  |  |  |  | 216 |  | 212 |  | 164 |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 257 |  | 221 |  | 220 |
Net income |  |  |  |  |  |  |  |  |  | 359 |  | 338 |  | 252 |
Cash Flow Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  | 1,254 |  | 1,134 |  | 1,107 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 10,082 |  |  |  | 9,426 |  |  |  | 10,082 |  | 9,426 |  |  |
Corporate And Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  |  |  |  |  |  |  |  |  | 5 |  | 13 |  | 20 |
Depreciation |  |  |  |  |  |  |  |  |  | 30 |  | 36 |  | 45 |
Amortization |  |  |  |  |  |  |  |  |  | 6 |  | 3 |  | 0 |
Unrealized (gains) losses on derivatives and other hedging activities |  |  |  |  |  |  |  |  |  | 6 |  | 0 |  | 0 |
Interest Expense |  |  |  |  |  |  |  |  |  | 101 |  | 97 |  | 92 |
Income from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | (112) |  | (119) |  | (144) |
Income Taxes |  |  |  |  |  |  |  |  |  | 57 |  | (39) |  | (48) |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 90 |  | 17 |  | (73) |
Net income |  |  |  |  |  |  |  |  |  | (169) |  | (80) |  | (96) |
Cash Flow Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  | 10 |  | 1 |  | 11 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 116 |  |  |  | 315 |  |  |  | 116 |  | 315 |  |  |
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss from Discontinued Operations (net of income taxes) |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | (921) |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  | 575 | 547 | 500 | 573 | 537 | 539 | 495 | 585 | 2,195 |  | 2,156 |  | 2,124 |
Depreciation |  |  |  |  |  |  |  |  |  | 309 |  | 253 |  | 214 |
Amortization |  |  |  |  |  |  |  |  |  | 33 |  | 32 |  | 26 |
Interest Expense |  |  |  |  |  |  |  |  |  | 142 |  | 129 |  | 130 |
Income from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 575 |  | 552 |  | 416 |
Income Taxes |  |  |  |  |  |  |  |  |  | 213 |  | 212 |  | 164 |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 258 |  | 221 |  | 220 |
Net income |  | 111 | $ 95 | $ 77 | $ 79 | 77 | $ 90 | $ 79 | $ 94 | 362 | [1] | 340 | [1] | 252 | [1]
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 10,082 |  |  |  | 9,426 |  |  |  | $ 10,082 |  | 9,426 |  |  |
Segment Information (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | Integer |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Number of reportable segments | Integer |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
LG And E And KU Energy LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  |  |  |  |  |  |  |  |  | $ 3,156 |  | 3,141 |  | 3,115 |
Depreciation |  |  |  |  |  |  |  |  |  | 439 |  | 404 |  | 382 |
Amortization |  |  |  |  |  |  |  |  |  | 24 |  | 29 |  | 27 |
Interest Expense |  |  |  |  |  |  |  |  |  | 197 |  | 197 |  | 178 |
Income from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 691 |  | 686 |  | 603 |
Income Taxes |  |  |  |  |  |  |  |  |  | 375 |  | 257 |  | 239 |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 294 |  | 291 |  | 236 |
Net income |  |  |  |  |  |  |  |  |  | 316 |  | 429 |  | 364 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 14,802 |  |  |  | 14,371 |  |  |  | $ 14,802 |  | 14,371 |  |  |
Segment Information (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | Integer |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Number of reportable segments | Integer |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  |  |  |  |  |  |  |  |  | $ 1,453 |  | 1,430 |  | 1,444 |
Depreciation |  |  |  |  |  |  |  |  |  | 183 |  | 170 |  | 162 |
Amortization |  |  |  |  |  |  |  |  |  | 14 |  | 14 |  | 11 |
Interest Expense |  |  |  |  |  |  |  |  |  | 71 |  | 71 |  | 57 |
Income from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 344 |  | 329 |  | 299 |
Income Taxes |  |  |  |  |  |  |  |  |  | 131 |  | 126 |  | 114 |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 126 |  | 147 |  | 126 |
Net income | [2] |  |  |  |  |  |  |  |  | 213 |  | 203 |  | 185 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 6,559 |  |  |  | 6,300 |  |  |  | $ 6,559 |  | 6,300 |  |  |
Segment Information (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | Integer |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Number of reportable segments | Integer |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  |  |  |  |  |  |  |  |  | $ 1,744 |  | 1,749 |  | 1,728 |
Depreciation |  |  |  |  |  |  |  |  |  | 255 |  | 234 |  | 220 |
Amortization |  |  |  |  |  |  |  |  |  | 9 |  | 14 |  | 13 |
Interest Expense |  |  |  |  |  |  |  |  |  | 96 |  | 96 |  | 82 |
Income from Continuing Operations Before Income Taxes |  |  |  |  |  |  |  |  |  | 418 |  | 428 |  | 374 |
Income Taxes |  |  |  |  |  |  |  |  |  | 159 |  | 163 |  | 140 |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 152 |  | 126 |  | 160 |
Net income | [3] |  |  |  |  |  |  |  |  | 259 |  | 265 |  | $ 234 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | $ 8,254 |  |  |  | $ 8,085 |  |  |  | $ 8,254 |  | $ 8,085 |  |  |
Segment Information (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | Integer |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Number of reportable segments | Integer |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
[1] | Net income equals comprehensive income.
[2] | Net income equals comprehensive income.
[3] | Net income approximates comprehensive income.

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- Definition Expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment. + References No definition available. + Details
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