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Segment and Related Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2016 USD ($) | Jun. 30, 2017 USD ($) Integer | Jun. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Income Statement Data [Abstract] |  |  |  |  |  |
Revenues from external customers |  | $ 1,725 | $ 1,785 | $ 3,676 | $ 3,796 |
Net Income |  | 292 | 483 | 695 | 964 |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | 39,964 |  | 39,964 |  | $ 38,315
PPL Electric Utilities Corp [Member] |  |  |  |  |  |
Income Statement Data [Abstract] |  |  |  |  |  |
Revenues from external customers |  | 500 | 495 | 1,073 | 1,080 |
Net Income | [1] | 77 | 79 | 156 | 173 |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | 10,175 |  | $ 10,175 |  | 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 |  | 723 | 721 | $ 1,532 | 1,547 |
Net Income |  | 87 | 84 | 190 | 204 |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | 14,377 |  | $ 14,377 |  | 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 |  | 324 | 323 | $ 715 | 709 |
Net Income | [1] | 42 | 40 | 96 | 96 |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | 6,294 |  | $ 6,294 |  | 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 |  | 406 | 407 | $ 843 | 860 |
Net Income | [2] | 56 | 54 | 119 | 129 |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | 8,086 |  | $ 8,086 |  | 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 |  | 502 | 563 | $ 1,070 | 1,158 |
Net Income |  | 148 | 345 | 434 | 634 |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | 15,798 |  | 15,798 |  | 14,537
Segment (Numeric) [Abstract] |  |  |  |  |  |
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation |  | 11,500 |  | 11,500 |  | 10,800
Kentucky Regulated [Member] |  |  |  |  |  |
Income Statement Data [Abstract] |  |  |  |  |  |
Revenues from external customers |  | 723 | 721 | 1,532 | 1,547 |
Net Income |  | 79 | 76 | 174 | 188 |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | 14,043 |  | 14,043 |  | 14,037
Pennsylvania Regulated [Member] |  |  |  |  |  |
Income Statement Data [Abstract] |  |  |  |  |  |
Revenues from external customers |  | 500 | 495 | 1,073 | 1,080 |
Net Income |  | 77 | 78 | 156 | 172 |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | 10,175 |  | 10,175 |  | 9,426
Corporate And Other [Member] |  |  |  |  |  |
Income Statement Data [Abstract] |  |  |  |  |  |
Revenues from external customers |  | 0 | 6 | 1 | 11 |
Net Income |  | (12) | $ (16) | (69) | $ (30) |
Balance Sheet Data [Abstract] |  |  |  |  |  |
Assets |  | $ (52) |  | $ (52) |  | $ 315
[1] | Net income equals comprehensive income.
[2] | Net income approximates comprehensive income.

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