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Income and Other Taxes (Unrecognized to End) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) Integer | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Income Tax Examination (Details) [Line Items] |  |  |
Number of major tax jurisdictions tax returns are filed | Integer | 4 |  |
Deferred Income Tax Expense (Benefit) | $ 338 | $ 410 | $ 753
Increase (Decrease) in Regulatory Assets and Liabilities | $ 88 | (13) | 12
US - Federal [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2015 and prior |  |
Pennsylvania - State [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2015 and prior |  |
Kentucky - State [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2014 and prior |  |
United Kingdom - Foreign [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2015 and prior |  |
LKE [Member] | Kentucky tax reform [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Deferred Income Tax Expense (Benefit) |  | 9 |
LGE [Member] | Kentucky tax reform [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  | 16 |
KU [Member] | Kentucky tax reform [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities |  | 19 |
PPL Electric Utilities Corp [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Number of major tax jurisdictions tax returns are filed | Integer | 2 |  |
Deferred Income Tax Expense (Benefit) | $ 90 | 133 | 263
Increase (Decrease) in Regulatory Assets and Liabilities | $ 43 | 19 | 5
PPL Electric Utilities Corp [Member] | US - Federal [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2015 and prior |  |
PPL Electric Utilities Corp [Member] | Pennsylvania - State [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2015 and prior |  |
LG And E And KU Energy LLC [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Number of major tax jurisdictions tax returns are filed | Integer | 2 |  |
Deferred Income Tax Expense (Benefit) | $ 86 | 99 | 300
Increase (Decrease) in Regulatory Assets and Liabilities | $ 45 | (32) | 7
LG And E And KU Energy LLC [Member] | US - Federal [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2015 and prior |  |
LG And E And KU Energy LLC [Member] | Kentucky - State [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2014 and prior |  |
LG And E And KU Energy LLC [Member] | Kentucky tax reform [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Deferred Income Tax Expense (Benefit) | $ 9 |  |
LG And E And KU Energy LLC [Member] | LGE [Member] | Kentucky tax reform [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | 16 |  |
LG And E And KU Energy LLC [Member] | KU [Member] | Kentucky tax reform [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ 19 |  |
Louisville Gas And Electric Co [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Number of major tax jurisdictions tax returns are filed | Integer | 2 |  |
Deferred Income Tax Expense (Benefit) | $ 56 | 61 | 126
Increase (Decrease) in Regulatory Assets and Liabilities | $ 19 | (5) | 5
Louisville Gas And Electric Co [Member] | US - Federal [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2015 and prior |  |
Louisville Gas And Electric Co [Member] | Kentucky - State [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2014 and prior |  |
Louisville Gas And Electric Co [Member] | Kentucky tax reform [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ 16 |  |
Kentucky Utilities Co [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Number of major tax jurisdictions tax returns are filed | Integer | 2 |  |
Deferred Income Tax Expense (Benefit) | $ 41 | 50 | 154
Increase (Decrease) in Regulatory Assets and Liabilities | $ 26 | $ (27) | $ 2
Kentucky Utilities Co [Member] | US - Federal [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2015 and prior |  |
Kentucky Utilities Co [Member] | Kentucky - State [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Income tax examination, year(s) no longer under examination | 2014 and prior |  |
Kentucky Utilities Co [Member] | Kentucky tax reform [Member] |  |  |
Income Tax Examination (Details) [Line Items] |  |  |
Increase (Decrease) in Regulatory Assets and Liabilities | $ 19 |  |

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