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Segment and Related Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) Integer | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Income Statement Data [Abstract] |  |  |  |  |  |
Revenues from external customers |  | $ 1,845 | $ 1,889 | $ 5,521 | $ 5,685 |
Net Income |  | 355 | 473 | 1,050 | 1,437 |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | 40,758 |  | 40,758 |  | $ 38,315
PPL Electric Utilities Corp [Member] |  |  |  |  |  |
Income Statement Data [Abstract] |  |  |  |  |  |
Revenues from external customers |  | 547 | 539 | 1,620 | 1,619 |
Net Income | [1] | 95 | 90 | 251 | 263 |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | 10,323 |  | $ 10,323 |  | 9,426
Segment (Numeric) [Abstract] |  |  |  |  |  |
Number of Reportable Segments | Integer |  |  |  | 1 |  |
Number of Operating Segments | Integer |  |  |  | 2 |  |
LG And E And KU Energy LLC [Member] |  |  |  |  |  |
Income Statement Data [Abstract] |  |  |  |  |  |
Revenues from external customers |  | 818 | 835 | $ 2,350 | 2,382 |
Net Income |  | 132 | 133 | 322 | 337 |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | 14,515 |  | $ 14,515 |  | 14,371
Segment (Numeric) [Abstract] |  |  |  |  |  |
Number of Reportable Segments | Integer |  |  |  | 1 |  |
Number of Operating Segments | Integer |  |  |  | 1 |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |
Income Statement Data [Abstract] |  |  |  |  |  |
Revenues from external customers |  | 363 | 368 | $ 1,078 | 1,077 |
Net Income | [1] | 65 | 63 | 161 | 159 |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | 6,390 |  | $ 6,390 |  | 6,300
Segment (Numeric) [Abstract] |  |  |  |  |  |
Number of Reportable Segments | Integer |  |  |  | 1 |  |
Number of Operating Segments | Integer |  |  |  | 1 |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |
Income Statement Data [Abstract] |  |  |  |  |  |
Revenues from external customers |  | 460 | 474 | $ 1,303 | 1,334 |
Net Income | [2] | 77 | 78 | 196 | 207 |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | 8,146 |  | $ 8,146 |  | 8,085
Segment (Numeric) [Abstract] |  |  |  |  |  |
Number of Reportable Segments | Integer |  |  |  | 1 |  |
Number of Operating Segments | Integer |  |  |  | 1 |  |
United Kingdom Regulated [Member] |  |  |  |  |  |
Income Statement Data [Abstract] |  |  |  |  |  |
Revenues from external customers |  | 477 | 515 | $ 1,547 | 1,673 |
Net Income |  | 126 | 281 | 560 | 915 |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | 16,052 |  | 16,052 |  | 14,537
Segment (Numeric) [Abstract] |  |  |  |  |  |
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation |  | 11,700 |  | 11,700 |  | 10,800
Kentucky Regulated [Member] |  |  |  |  |  |
Income Statement Data [Abstract] |  |  |  |  |  |
Revenues from external customers |  | 818 | 835 | 2,350 | 2,382 |
Net Income |  | 125 | 126 | 299 | 314 |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | 14,181 |  | 14,181 |  | 14,037
Pennsylvania Regulated [Member] |  |  |  |  |  |
Income Statement Data [Abstract] |  |  |  |  |  |
Revenues from external customers |  | 547 | 539 | 1,620 | 1,619 |
Net Income |  | 95 | 91 | 251 | 263 |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | 10,323 |  | 10,323 |  | 9,426
Corporate And Other [Member] |  |  |  |  |  |
Income Statement Data [Abstract] |  |  |  |  |  |
Revenues from external customers |  | 3 | 0 | 4 | 11 |
Net Income |  | 9 | $ (25) | (60) | $ (55) |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | $ 202 |  | $ 202 |  | $ 315
[1] | Net income equals comprehensive income.
[2] | Net income approximates comprehensive income.

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