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)