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Utility Rate Regulation (Regulatory Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | $ 115 | $ 122
Noncurrent regulatory liabilities | 2,572 | 2,714
Generation Supply Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 23 | 33
Transmission Service Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 5 | 16
Universal Service Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 9 | 27
Transmission Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 8 | 0
TCJA customer refund [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 61 | 20
Noncurrent regulatory liabilities | 0 | 41
Storm Damage Expense Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 5 | 5
Generation formula rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 1 | 7
Accumulated cost of removal of utility plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 640 | 674
Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 51 | 59
Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 1,756 | 1,826
Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 51 | 37
Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 68 | 72
Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 3 | 14
Noncurrent regulatory liabilities | 6 | 5
PPL Electric Utilities Corp [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 96 | 74
Noncurrent regulatory liabilities | 599 | 675
PPL Electric Utilities Corp [Member] | Generation Supply Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 23 | 33
PPL Electric Utilities Corp [Member] | Transmission Service Charge [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 3
PPL Electric Utilities Corp [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Universal Service Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 9 | 27
PPL Electric Utilities Corp [Member] | Transmission Formula Rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 3
PPL Electric Utilities Corp [Member] | Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | TCJA customer refund [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 59 | 3
Noncurrent regulatory liabilities | 0 | 41
PPL Electric Utilities Corp [Member] | Storm Damage Expense Rider [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 5 | 5
PPL Electric Utilities Corp [Member] | Generation formula rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Accumulated cost of removal of utility plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 588 | 629
PPL Electric Utilities Corp [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 11 | 5
PPL Electric Utilities Corp [Member] | Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 0 | 0
PPL Electric Utilities Corp [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Noncurrent regulatory liabilities | 0 | 0
LG And E And KU Energy LLC [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 19 | 48
Noncurrent regulatory liabilities | 1,973 | 2,039
LG And E And KU Energy LLC [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 5 | 16
LG And E And KU Energy LLC [Member] | Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 8 | 0
LG And E And KU Energy LLC [Member] | TCJA customer refund [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 2 | 17
LG And E And KU Energy LLC [Member] | Generation formula rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 1 | 7
LG And E And KU Energy LLC [Member] | Accumulated cost of removal of utility plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 640 | 674
LG And E And KU Energy LLC [Member] | Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 51 | 59
LG And E And KU Energy LLC [Member] | Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 1,168 | 1,197
LG And E And KU Energy LLC [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 40 | 32
LG And E And KU Energy LLC [Member] | Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 68 | 72
LG And E And KU Energy LLC [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 3 | 8
Noncurrent regulatory liabilities | 6 | 5
Louisville Gas And Electric Co [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 2 | 17
Noncurrent regulatory liabilities | 883 | 915
Louisville Gas And Electric Co [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 1 | 6
Louisville Gas And Electric Co [Member] | Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | TCJA customer refund [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 7
Louisville Gas And Electric Co [Member] | Generation formula rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | Accumulated cost of removal of utility plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 266 | 279
Louisville Gas And Electric Co [Member] | Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 35 | 41
Louisville Gas And Electric Co [Member] | Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 544 | 557
Louisville Gas And Electric Co [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 0 | 0
Louisville Gas And Electric Co [Member] | Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 34 | 36
Louisville Gas And Electric Co [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 1 | 4
Noncurrent regulatory liabilities | 4 | 2
Kentucky Utilities Co [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 17 | 31
Noncurrent regulatory liabilities | 1,090 | 1,124
Kentucky Utilities Co [Member] | Environmental Cost Recovery [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 4 | 10
Kentucky Utilities Co [Member] | Fuel Adjustment Clause [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 8 | 0
Kentucky Utilities Co [Member] | TCJA customer refund [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 2 | 10
Kentucky Utilities Co [Member] | Generation formula rate [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 1 | 7
Kentucky Utilities Co [Member] | Accumulated cost of removal of utility plant [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 374 | 395
Kentucky Utilities Co [Member] | Power Purchase Agreement Ohio Valley Electric Corporation [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 16 | 18
Kentucky Utilities Co [Member] | Net deferred taxes [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 624 | 640
Kentucky Utilities Co [Member] | Defined Benefit Plans [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 40 | 32
Kentucky Utilities Co [Member] | Terminated interest rate swaps [Member] |  |
Regulatory Liabilities [Line Items] |  |
Noncurrent regulatory liabilities | 34 | 36
Kentucky Utilities Co [Member] | Other Regulatory Liabilities [Member] |  |
Regulatory Liabilities [Line Items] |  |
Current regulatory liabilities | 2 | 4
Noncurrent regulatory liabilities | $ 2 | $ 3

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