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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, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) Integer | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  | $ 1,939 | $ 1,872 | $ 1,848 | $ 2,126 | $ 1,926 | $ 1,845 | $ 1,725 | $ 1,951 | $ 7,785 |  | $ 7,447 |  | $ 7,517 |
Depreciation |  |  |  |  |  |  |  |  |  | 1,094 |  | 1,008 |  | 926 |
Amortization |  |  |  |  |  |  |  |  |  | 78 |  | 97 |  | 80 |
Unrealized (gains) losses on derivatives and other hedging activities |  |  |  |  |  |  |  |  |  | (186) |  | 178 |  | 19 |
Interest Expense |  |  |  |  |  |  |  |  |  | 963 |  | 901 |  | 888 |
Income Before Income Taxes |  |  |  |  |  |  |  |  |  | 2,285 |  | 1,912 |  | 2,550 |
Income Taxes |  |  |  |  |  |  |  |  |  | 458 |  | 784 |  | 648 |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 355 |  | 707 |  | 560 |
Net income |  | 415 | 445 | 515 | 452 | 78 | 355 | 292 | 403 | 1,827 |  | 1,128 |  | 1,902 |
Cash Flow Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  | 3,268 |  | 3,171 |  | 2,957 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 43,396 |  |  |  | 41,479 |  |  |  | $ 43,396 |  | 41,479 |  |  |
Segment Information (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | Integer |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
U.K. Regulated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  |  |  |  |  |  |  |  |  | $ 2,268 |  | 2,091 |  | 2,207 |
Depreciation |  |  |  |  |  |  |  |  |  | 247 |  | 230 |  | 233 |
Amortization |  |  |  |  |  |  |  |  |  | 34 |  | 34 |  | 16 |
Unrealized (gains) losses on derivatives and other hedging activities |  |  |  |  |  |  |  |  |  | (190) |  | 166 |  | 13 |
Interest Expense |  |  |  |  |  |  |  |  |  | 413 |  | 397 |  | 402 |
Income Before Income Taxes |  |  |  |  |  |  |  |  |  | 1,339 |  | 804 |  | 1,479 |
Income Taxes |  |  |  |  |  |  |  |  |  | 225 |  | 152 |  | 233 |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 118 |  | 66 |  | 31 |
Net income |  |  |  |  |  |  |  |  |  | 1,114 |  | 652 |  | 1,246 |
Cash Flow Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  | 954 |  | 1,015 |  | 1,031 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 16,700 |  |  |  | 16,813 |  |  |  | 16,700 |  | 16,813 |  |  |
Segment Information (Numeric) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation |  | 12,400 |  |  |  | 12,500 |  |  |  | 12,400 |  | 12,500 |  |  |
Kentucky Regulated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  |  |  |  |  |  |  |  |  | 3,214 |  | 3,156 |  | 3,141 |
Depreciation |  |  |  |  |  |  |  |  |  | 475 |  | 439 |  | 404 |
Amortization |  |  |  |  |  |  |  |  |  | 18 |  | 24 |  | 29 |
Unrealized (gains) losses on derivatives and other hedging activities |  |  |  |  |  |  |  |  |  | 6 |  | 6 |  | 6 |
Interest Expense |  |  |  |  |  |  |  |  |  | 274 |  | 261 |  | 260 |
Income Before Income Taxes |  |  |  |  |  |  |  |  |  | 531 |  | 645 |  | 640 |
Income Taxes |  |  |  |  |  |  |  |  |  | 120 |  | 359 |  | 242 |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 94 |  | 294 |  | 291 |
Net income |  |  |  |  |  |  |  |  |  | 411 |  | 286 |  | 398 |
Cash Flow Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  | 1,117 |  | 892 |  | 791 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 15,078 |  |  |  | 14,468 |  |  |  | 15,078 |  | 14,468 |  |  |
Pennsylvania Regulated [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  |  |  |  |  |  |  |  |  | 2,277 |  | 2,195 |  | 2,156 |
Depreciation |  |  |  |  |  |  |  |  |  | 352 |  | 309 |  | 253 |
Amortization |  |  |  |  |  |  |  |  |  | 22 |  | 33 |  | 32 |
Interest Expense |  |  |  |  |  |  |  |  |  | 159 |  | 142 |  | 129 |
Income Before Income Taxes |  |  |  |  |  |  |  |  |  | 567 |  | 575 |  | 550 |
Income Taxes |  |  |  |  |  |  |  |  |  | 136 |  | 216 |  | 212 |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 125 |  | 257 |  | 221 |
Net income |  |  |  |  |  |  |  |  |  | 431 |  | 359 |  | 338 |
Cash Flow Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  | 1,196 |  | 1,254 |  | 1,134 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 11,257 |  |  |  | 10,082 |  |  |  | 11,257 |  | 10,082 |  |  |
Corporate And Other [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  |  |  |  |  |  |  |  |  | 26 |  | 5 |  | 13 |
Depreciation |  |  |  |  |  |  |  |  |  | 20 |  | 30 |  | 36 |
Amortization |  |  |  |  |  |  |  |  |  | 4 |  | 6 |  | 3 |
Unrealized (gains) losses on derivatives and other hedging activities |  |  |  |  |  |  |  |  |  | (2) |  | 6 |  | 0 |
Interest Expense |  |  |  |  |  |  |  |  |  | 117 |  | 101 |  | 97 |
Income Before Income Taxes |  |  |  |  |  |  |  |  |  | (152) |  | (112) |  | (119) |
Income Taxes |  |  |  |  |  |  |  |  |  | (23) |  | 57 |  | (39) |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 18 |  | 90 |  | 17 |
Net income |  |  |  |  |  |  |  |  |  | (129) |  | (169) |  | (80) |
Cash Flow Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenditures for long-lived assets |  |  |  |  |  |  |  |  |  | 1 |  | 10 |  | 1 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 361 |  |  |  | 116 |  |  |  | 361 |  | 116 |  |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Revenues from external customers |  | 573 | 548 | 517 | 639 | 575 | 547 | 500 | 573 | 2,277 |  | 2,195 |  | 2,156 |
Depreciation |  |  |  |  |  |  |  |  |  | 352 |  | 309 |  | 253 |
Amortization |  |  |  |  |  |  |  |  |  | 22 |  | 33 |  | 32 |
Interest Expense |  |  |  |  |  |  |  |  |  | 159 |  | 142 |  | 129 |
Income Before Income Taxes |  |  |  |  |  |  |  |  |  | 566 |  | 575 |  | 552 |
Income Taxes |  |  |  |  |  |  |  |  |  | 136 |  | 213 |  | 212 |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 125 |  | 258 |  | 221 |
Net income |  | 96 | $ 111 | $ 75 | $ 148 | 111 | $ 95 | $ 77 | $ 79 | 430 | [1] | 362 | [1] | 340 | [1]
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 11,243 |  |  |  | 10,082 |  |  |  | $ 11,243 |  | 10,082 |  |  |
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 |  |  |  |  |  |  |  |  |  | $ 3,214 |  | 3,156 |  | 3,141 |
Depreciation |  |  |  |  |  |  |  |  |  | 475 |  | 439 |  | 404 |
Amortization |  |  |  |  |  |  |  |  |  | 18 |  | 24 |  | 29 |
Interest Expense |  |  |  |  |  |  |  |  |  | 206 |  | 197 |  | 197 |
Income Before Income Taxes |  |  |  |  |  |  |  |  |  | 574 |  | 691 |  | 686 |
Income Taxes |  |  |  |  |  |  |  |  |  | 129 |  | 375 |  | 257 |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 94 |  | 294 |  | 291 |
Net income |  |  |  |  |  |  |  |  |  | 445 |  | 316 |  | 429 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 15,412 |  |  |  | 14,802 |  |  |  | $ 15,412 |  | 14,802 |  |  |
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 |  |  |  |  |  |  |  |  |  | $ 1,496 |  | 1,453 |  | 1,430 |
Depreciation |  |  |  |  |  |  |  |  |  | 195 |  | 183 |  | 170 |
Amortization |  |  |  |  |  |  |  |  |  | 14 |  | 14 |  | 14 |
Interest Expense |  |  |  |  |  |  |  |  |  | 76 |  | 71 |  | 71 |
Income Before Income Taxes |  |  |  |  |  |  |  |  |  | 297 |  | 344 |  | 329 |
Income Taxes |  |  |  |  |  |  |  |  |  | 64 |  | 131 |  | 126 |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 60 |  | 126 |  | 147 |
Net income | [2] |  |  |  |  |  |  |  |  | 233 |  | 213 |  | 203 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 6,883 |  |  |  | 6,559 |  |  |  | $ 6,883 |  | 6,559 |  |  |
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 |  |  |  |  |  |  |  |  |  | $ 1,760 |  | 1,744 |  | 1,749 |
Depreciation |  |  |  |  |  |  |  |  |  | 279 |  | 255 |  | 234 |
Amortization |  |  |  |  |  |  |  |  |  | 3 |  | 9 |  | 14 |
Interest Expense |  |  |  |  |  |  |  |  |  | 100 |  | 96 |  | 96 |
Income Before Income Taxes |  |  |  |  |  |  |  |  |  | 362 |  | 418 |  | 428 |
Income Taxes |  |  |  |  |  |  |  |  |  | 76 |  | 159 |  | 163 |
Deferred income taxes and investment tax credits |  |  |  |  |  |  |  |  |  | 48 |  | 152 |  | 126 |
Net income | [3] |  |  |  |  |  |  |  |  | 286 |  | 259 |  | $ 265 |
Balance Sheet Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | $ 8,540 |  |  |  | $ 8,254 |  |  |  | $ 8,540 |  | $ 8,254 |  |  |
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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