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New Accounting Guidance Adopted (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cash and cash equivalents | $ 621 | $ 485 |  |
Total Cash, Cash Equivalents and Restricted Cash | 643 | 511 | $ 372 | $ 875
Defined benefit plans - non-service credits | 257 | 167 | 112 |
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment | (51) |  |  |
Accounting Standards Update 2016-18 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cash and cash equivalents | 621 | 485 |  |
Restricted cash - current | 3 | 3 |  |
Restricted cash - noncurrent | 19 | 23 |  |
Total Cash, Cash Equivalents and Restricted Cash | 643 | 511 |  |
Accounting Standards Update 2017-07 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Defined Benefit Plan Net Periodic Benefit Cost - Non-Service Cost Previously Capitalized Due To ASU 2017-07 - Before Tax | 22 |  |  |
Defined Benefit Plan Net Periodic Benefit Cost - Non-Service Cost Previously Capitalized Due To ASU 2017-07 - After Tax | $ 17 |  |  |
Defined Benefit Plan Net Periodic Benefit Cost - Non-Service Cost Previously Capitalized Due to ASU 2017-07 - Per Share | $ 0.02 |  |  |
Defined benefit plans - non-service credits | $ 257 | 167 | 112 |
Accounting Standards Update 2018-02 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment | 51 |  |  |
PPL Electric Utilities Corp [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cash and cash equivalents | 267 | 49 |  |
Total Cash, Cash Equivalents and Restricted Cash | 269 | 51 | 15 | 49
Defined benefit plans - non-service credits | 5 | 1 | 3 |
PPL Electric Utilities Corp [Member] | Accounting Standards Update 2016-18 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cash and cash equivalents | 267 | 49 |  |
Restricted cash - current | 2 | 2 |  |
Restricted cash - noncurrent | 0 | 0 |  |
Total Cash, Cash Equivalents and Restricted Cash | 269 | 51 |  |
PPL Electric Utilities Corp [Member] | Accounting Standards Update 2017-07 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Defined benefit plans - non-service credits | 5 | 1 | 3 |
LG And E And KU Energy LLC [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cash and cash equivalents | 24 | 30 | 13 | 30
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment | (18) |  |  |
LG And E And KU Energy LLC [Member] | Accounting Standards Update 2017-07 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Defined benefit plans - non-service credits | 4 | (5) | (6) |
LG And E And KU Energy LLC [Member] | Accounting Standards Update 2018-02 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Adoption of reclassification of certain tax effects from AOCI guidance cumulative effect adjustment | 18 |  |  |
Louisville Gas And Electric Co [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cash and cash equivalents | 10 | 15 | 5 | 19
Louisville Gas And Electric Co [Member] | Accounting Standards Update 2017-07 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Defined benefit plans - non-service credits | (2) | (5) | (5) |
Kentucky Utilities Co [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cash and cash equivalents | 14 | 15 | 7 | $ 11
Kentucky Utilities Co [Member] | Accounting Standards Update 2017-07 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Defined benefit plans - non-service credits | $ 3 | $ (1) | $ (2) |

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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