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Segment and Related Information (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) Integer | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($)
Income Statement Data [Abstract] |  |  |  |
Operating Revenues from external customers |  | $ 2,126 | $ 1,951 |
Net Income |  | 452 | 403 |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | 42,388 |  | $ 41,479
PPL Electric Utilities Corp [Member] |  |  |  |
Income Statement Data [Abstract] |  |  |  |
Operating Revenues from external customers |  | 639 | 573 |
Net Income | [1] | 148 | 79 |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | $ 10,343 |  | 10,082
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] |  |  |  |
Operating Revenues from external customers |  | $ 872 | 809 |
Net Income | [2] | 142 | 103 |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | $ 14,834 |  | 14,802
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] |  |  |  |
Operating Revenues from external customers |  | $ 419 | 391 |
Net Income | [1] | 72 | 54 |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | $ 6,587 |  | 6,559
Segment (Numeric) [Abstract] |  |  |  |
Number of Reportable Segments | Integer |  | 1 |  |
Number of Operating Segments | Integer |  | 1 |  |
Kentucky Utilities Co [Member] |  |  |  |
Income Statement Data [Abstract] |  |  |  |
Operating Revenues from external customers |  | $ 471 | 437 |
Net Income | [2] | 87 | 63 |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | $ 8,276 |  | 8,254
Segment (Numeric) [Abstract] |  |  |  |
Number of Reportable Segments | Integer |  | 1 |  |
Number of Operating Segments | Integer |  | 1 |  |
United Kingdom Regulated [Member] |  |  |  |
Income Statement Data [Abstract] |  |  |  |
Operating Revenues from external customers |  | $ 615 | 568 |
Net Income |  | 197 | 286 |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | 17,444 |  | 16,813
Segment (Numeric) [Abstract] |  |  |  |
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation |  | 12,900 |  | 12,500
Kentucky Regulated [Member] |  |  |  |
Income Statement Data [Abstract] |  |  |  |
Operating Revenues from external customers |  | 872 | 809 |
Net Income |  | 133 | 95 |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | 14,500 |  | 14,468
Kentucky Regulated [Member] | LG And E And KU Energy LLC [Member] |  |  |  |
Income Statement Data [Abstract] |  |  |  |
Operating Revenues from external customers |  | 872 |  |
Pennsylvania Regulated [Member] |  |  |  |
Income Statement Data [Abstract] |  |  |  |
Operating Revenues from external customers |  | 639 | 573 |
Net Income |  | 148 | 79 |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | 10,356 |  | 10,082
Pennsylvania Regulated [Member] | PPL Electric Utilities Corp [Member] |  |  |  |
Income Statement Data [Abstract] |  |  |  |
Operating Revenues from external customers |  | 639 |  |
Corporate And Other [Member] |  |  |  |
Income Statement Data [Abstract] |  |  |  |
Operating Revenues from external customers |  | 0 | 1 |
Net Income |  | (26) | $ (57) |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | $ 88 |  | $ 116
[1] | Net income equals comprehensive income.
[2] | Net income approximates comprehensive income.

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