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Segment and Related Information (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 USD ($) Integer | Mar. 31, 2016 USD ($) | Dec. 31, 2016 USD ($)
Income Statement Data [Abstract] |  |  |  |
Revenues from external customers |  | $ 1,951 | $ 2,011 |
Net Income |  | 403 | 481 |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | 39,034 |  | $ 38,315
PPL Electric Utilities Corp [Member] |  |  |  |
Income Statement Data [Abstract] |  |  |  |
Revenues from external customers |  | 573 | 585 |
Net Income | [1] | 79 | 94 |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | $ 9,699 |  | 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 |  | $ 809 | 826 |
Net Income | [2] | 103 | 120 |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | $ 14,344 |  | 14,371
Segment (Numeric) [Abstract] |  |  |  |
Number of Reportable Segments | Integer |  | 1 |  |
Louisville Gas And Electric Co [Member] |  |  |  |
Income Statement Data [Abstract] |  |  |  |
Revenues from external customers |  | $ 391 | 386 |
Net Income | [1] | 54 | 56 |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | $ 6,268 |  | 6,300
Segment (Numeric) [Abstract] |  |  |  |
Number of Reportable Segments | Integer |  | 1 |  |
Kentucky Utilities Co [Member] |  |  |  |
Income Statement Data [Abstract] |  |  |  |
Revenues from external customers |  | $ 437 | 453 |
Net Income | [2] | 63 | 75 |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | $ 8,086 |  | 8,085
Segment (Numeric) [Abstract] |  |  |  |
Number of Reportable Segments | Integer |  | 1 |  |
United Kingdom Regulated [Member] |  |  |  |
Income Statement Data [Abstract] |  |  |  |
Revenues from external customers |  | $ 568 | 595 |
Net Income |  | 286 | 289 |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | 15,039 |  | 14,537
Segment (Numeric) [Abstract] |  |  |  |
Net property, plant and equipment not subject to accounting for the effects of certain types of regulation |  | 10,900 |  | 10,800
Kentucky Regulated [Member] |  |  |  |
Income Statement Data [Abstract] |  |  |  |
Revenues from external customers |  | 809 | 826 |
Net Income |  | 95 | 112 |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | 14,010 |  | 14,037
Pennsylvania Regulated [Member] |  |  |  |
Income Statement Data [Abstract] |  |  |  |
Revenues from external customers |  | 573 | 585 |
Net Income |  | 79 | 94 |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | 9,699 |  | 9,426
Corporate And Other [Member] |  |  |  |
Income Statement Data [Abstract] |  |  |  |
Revenues from external customers |  | 1 | 5 |
Net Income |  | (57) | $ (14) |
Balance Sheet Data [Abstract] |  |  |  |
Assets |  | $ 286 |  | $ 315
[1] | Net income equals comprehensive income.
[2] | Net income approximates comprehensive income.

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