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Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit- Non Service | $ 66 | $ 44 | $ 134 | $ 82 |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 852 |  | 852 |  | $ 485 |
Restricted Cash, Current | 3 |  | 3 |  | 3 |
Restricted Cash, Noncurrent | 20 |  | 20 |  | 23 |
Cash, Cash Equivalents and Restricted Cash | 875 | 490 | 875 | 490 | 511 | $ 367
Income Statement impact of ASU 2017-07 [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit- Non Service | 6 |  | 11 |  |  |
Defined Benefit Plan Net Periodic Benefit (Cost) Credit Non Service, After tax | $ 5 |  | $ 9 |  |  |
Defined Benefit Plan Net Periodic Benefit (Cost) Credit NonService, Per Share | $ 0.01 |  | $ 0.01 |  |  |
Impact of adoption of ASU 2017-07 [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit- Non Service | $ 66 | 44 | $ 134 | 82 |  |
PPL Electric Utilities Corp [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit- Non Service | 1 | 1 | 3 | 0 |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 489 |  | 489 |  | 49 |
Restricted Cash, Current | 2 |  | 2 |  | 2 |
Restricted Cash, Noncurrent | 0 |  | 0 |  | 0 |
Cash, Cash Equivalents and Restricted Cash | 491 | 61 | 491 | 61 | 51 | 15
PPL Electric Utilities Corp [Member] | Impact of adoption of ASU 2017-07 [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit- Non Service | 1 | 1 | 3 | 0 |  |
LG And E And KU Energy LLC [Member] |  |  |  |  |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 39 | 19 | 39 | 19 | 30 | 13
LG And E And KU Energy LLC [Member] | Impact of adoption of ASU 2017-07 [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit- Non Service | 0 | 0 | 2 | (2) |  |
Louisville Gas And Electric Co [Member] |  |  |  |  |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 19 | 7 | 19 | 7 | 15 | 5
Louisville Gas And Electric Co [Member] | Impact of adoption of ASU 2017-07 [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit- Non Service | (2) | 0 | (1) | (2) |  |
Kentucky Utilities Co [Member] |  |  |  |  |  |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow Statement [Line Items] |  |  |  |  |  |
Cash and cash equivalents | 20 | 12 | 20 | 12 | $ 15 | $ 7
Kentucky Utilities Co [Member] | Impact of adoption of ASU 2017-07 [Member] |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit- Non Service | $ 1 | $ 0 | $ 2 | $ (1) |  |

X
- Definition The non-service cost components of net periodic defined benefit costs (credits) (interest cost, expected return on plan assets, amortization of prior service cost and amortization of actuarial loss) that are presented in "Other Income (Expense) - net" on the Statements of Income. + References No definition available. + Details
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