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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Summary of Significant Accounting Policies [Line Items] |
Schedule of Utility Revenue | For the years ended December 31, the Statements of Income "Operating Revenues" line item contains revenue from the following:
| 2018 |  | 2017 |  | 2016
Domestic electric and gas revenues (a) | $ | 5,491 |  |  | $ | 5,351 |  |  | $ | 5,297 |
U.K. operating revenues (b) | 2,268 |  |  | 2,091 |  |  | 2,207 |
Domestic - other | 26 |  |  | 5 |  |  | 13 |
Total | $ | 7,785 |  |  | $ | 7,447 |  |  | $ | 7,517 |
(a) | Represents revenues from cost-based rate-regulated generation, transmission and/or distribution in Pennsylvania, Kentucky and Virginia, including regulated wholesale revenue.
(b) | Primarily represents regulated electricity distribution revenues from the operation of WPD's distribution networks.
Schedule of Valuation and Qualifying Accounts Disclosure | The changes in the allowance for doubtful accounts were:
|  |  | Additions |  |  |  |
| Balance at Beginning of Period |  | Charged to Income |  | Charged to Other Accounts |  | Deductions (a) |  | Balance at End of Period
PPL |  |  |  |  |  |  |  |  |
2018 | $ | 51 |  |  | $ | 41 |  |  | $ | 3 |  |  | $ | 39 |  |  | $ | 56 |
2017 | 54 |  |  | 28 |  |  | (1 | ) |  | 30 |  |  | 51 |
2016 | 41 |  |  | 44 |  |  | — |  |  | 31 |  |  | 54 |
PPL Electric |  |  |  |  |  |  |  |  |
2018 | $ | 24 |  |  | $ | 29 |  |  | $ | — |  |  | $ | 26 |  |  | $ | 27 |
2017 | 28 |  |  | 18 |  |  | — |  |  | 22 |  |  | 24 |
2016 | 16 |  |  | 35 |  |  | — |  |  | 23 |  |  | 28 |
LKE |  |  |  |  |  |  |  |  |
2018 | $ | 25 |  |  | $ | 10 |  |  | $ | 3 |  |  | $ | 11 |  |  | $ | 27 |
2017 | 24 |  |  | 8 |  |  | (1 | ) |  | 6 |  |  | 25 |
2016 | 23 |  |  | 8 |  |  | — |  |  | 7 |  |  | 24 |
LG&E |  |  |  |  |  |  |  |  |
2018 | $ | 1 |  |  | $ | 4 |  |  | $ | 1 |  |  | $ | 5 |  |  | $ | 1 |
2017 | 2 |  |  | 2 |  |  | (1 | ) |  | 2 |  |  | 1 |
2016 | 1 |  |  | 2 |  |  | 1 |  |  | 2 |  |  | 2 |
KU |  |  |  |  |  |  |  |  |
2018 | $ | 1 |  |  | $ | 5 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 2 |
2017 | 2 |  |  | 4 |  |  | (1 | ) |  | 4 |  |  | 1 |
2016 | 2 |  |  | 4 |  |  | — |  |  | 4 |  |  | 2 |
(a) | Primarily related to uncollectible accounts written off.
Weighted-average Rates of Depreciation | Following are the weighted-average annual rates of depreciation, for regulated utility plant, for the years ended December 31:
| 2018 |  | 2017 |  | 2016
PPL | 2.77 | % |  | 2.65 | % |  | 2.73 | %
PPL Electric | 3.01 | % |  | 2.86 | % |  | 2.63 | %
LKE | 3.69 | % |  | 3.64 | % |  | 3.69 | %
LG&E | 3.63 | % |  | 3.63 | % |  | 3.58 | %
KU | 3.74 | % |  | 3.66 | % |  | 3.77 | %
Schedule of Utility Inventory | "Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31:
| PPL |  | LKE |  | LG&E |  | KU
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Fuel | $ | 98 |  |  | $ | 107 |  |  | $ | 98 |  |  | $ | 107 |  |  | $ | 42 |  |  | $ | 45 |  |  | $ | 56 |  |  | $ | 62 |
Natural gas stored underground | 41 |  |  | 43 |  |  | 41 |  |  | 43 |  |  | 41 |  |  | 43 |  |  | — |  |  | — |
Materials and supplies | 164 |  |  | 170 |  |  | 109 |  |  | 104 |  |  | 44 |  |  | 43 |  |  | 65 |  |  | 61 |
Total | $ | 303 |  |  | $ | 320 |  |  | $ | 248 |  |  | $ | 254 |  |  | $ | 127 |  |  | $ | 131 |  |  | $ | 121 |  |  | $ | 123 |
Schedule of Non-Service Benefits Costs (Credits) | The following provides the non-service cost components of net periodic benefits (costs) or credits presented in "Other Income (Expense) - net" in 2018 and reclassified from "Other operation and maintenance" to "Other Income (Expense) - net" in 2017 and 2016 on the Statements of Income as a result of the adoption.
| 2018 |  | 2017 |  | 2016
PPL | $ | 257 |  |  | $ | 167 |  |  | $ | 112 |
PPL Electric | 5 |  |  | 1 |  |  | 3 |
LKE | 4 |  |  | (5 | ) |  | (6 | )
LG&E | (2 | ) |  | (5 | ) |  | (5 | )
KU | 3 |  |  | (1 | ) |  | (2 | )
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow | The following provides a reconciliation of Cash, Cash Equivalents and Restricted Cash reported within the Balance Sheets that sum to the total of the same amounts shown on the Statements of Cash Flows:
| PPL |  | PPL Electric
| December 31, 2018 |  | December 31, 2017 |  | December 31, 2018 |  | December 31, 2017
Cash and cash equivalents | $ | 621 |  |  | $ | 485 |  |  | $ | 267 |  |  | $ | 49 |
Restricted cash - current | 3 |  |  | 3 |  |  | 2 |  |  | 2 |
Restricted cash - noncurrent (a) | 19 |  |  | 23 |  |  | — |  |  | — |
Total Cash, Cash Equivalents and Restricted Cash | $ | 643 |  |  | $ | 511 |  |  | $ | 269 |  |  | $ | 51 |
(a) | Primarily consists of funds received by WPD, which are to be spent on approved initiatives to support a low carbon environment.
PPL Electric Utilities Corp [Member] |
Summary of Significant Accounting Policies [Line Items] |
Intercompany tax receivables (payables) | At December 31, the following intercompany tax receivables (payables) were recorded:
| 2018 |  | 2017
PPL Electric | $ | 19 |  |  | $ | 61 |
LKE | (16 | ) |  | (23 | )
LG&E | — |  |  | — |
KU | (5 | ) |  | — |
Reconciliation of Cash, Cash Equivalents and Restricted Cash from the Balance Sheet to Cash Flow | The following provides a reconciliation of Cash, Cash Equivalents and Restricted Cash reported within the Balance Sheets that sum to the total of the same amounts shown on the Statements of Cash Flows:
| PPL |  | PPL Electric
| December 31, 2018 |  | December 31, 2017 |  | December 31, 2018 |  | December 31, 2017
Cash and cash equivalents | $ | 621 |  |  | $ | 485 |  |  | $ | 267 |  |  | $ | 49 |
Restricted cash - current | 3 |  |  | 3 |  |  | 2 |  |  | 2 |
Restricted cash - noncurrent (a) | 19 |  |  | 23 |  |  | — |  |  | — |
Total Cash, Cash Equivalents and Restricted Cash | $ | 643 |  |  | $ | 511 |  |  | $ | 269 |  |  | $ | 51 |
(a) | Primarily consists of funds received by WPD, which are to be spent on approved initiatives to support a low carbon environment.
LG And E And KU Energy LLC [Member] |
Summary of Significant Accounting Policies [Line Items] |
Intercompany tax receivables (payables) | At December 31, the following intercompany tax receivables (payables) were recorded:
| 2018 |  | 2017
PPL Electric | $ | 19 |  |  | $ | 61 |
LKE | (16 | ) |  | (23 | )
LG&E | — |  |  | — |
KU | (5 | ) |  | — |
Schedule of Utility Inventory | "Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31:
| PPL |  | LKE |  | LG&E |  | KU
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Fuel | $ | 98 |  |  | $ | 107 |  |  | $ | 98 |  |  | $ | 107 |  |  | $ | 42 |  |  | $ | 45 |  |  | $ | 56 |  |  | $ | 62 |
Natural gas stored underground | 41 |  |  | 43 |  |  | 41 |  |  | 43 |  |  | 41 |  |  | 43 |  |  | — |  |  | — |
Materials and supplies | 164 |  |  | 170 |  |  | 109 |  |  | 104 |  |  | 44 |  |  | 43 |  |  | 65 |  |  | 61 |
Total | $ | 303 |  |  | $ | 320 |  |  | $ | 248 |  |  | $ | 254 |  |  | $ | 127 |  |  | $ | 131 |  |  | $ | 121 |  |  | $ | 123 |
Louisville Gas And Electric Co [Member] |
Summary of Significant Accounting Policies [Line Items] |
Intercompany tax receivables (payables) | At December 31, the following intercompany tax receivables (payables) were recorded:
| 2018 |  | 2017
PPL Electric | $ | 19 |  |  | $ | 61 |
LKE | (16 | ) |  | (23 | )
LG&E | — |  |  | — |
KU | (5 | ) |  | — |
Schedule of Utility Inventory | "Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31:
| PPL |  | LKE |  | LG&E |  | KU
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Fuel | $ | 98 |  |  | $ | 107 |  |  | $ | 98 |  |  | $ | 107 |  |  | $ | 42 |  |  | $ | 45 |  |  | $ | 56 |  |  | $ | 62 |
Natural gas stored underground | 41 |  |  | 43 |  |  | 41 |  |  | 43 |  |  | 41 |  |  | 43 |  |  | — |  |  | — |
Materials and supplies | 164 |  |  | 170 |  |  | 109 |  |  | 104 |  |  | 44 |  |  | 43 |  |  | 65 |  |  | 61 |
Total | $ | 303 |  |  | $ | 320 |  |  | $ | 248 |  |  | $ | 254 |  |  | $ | 127 |  |  | $ | 131 |  |  | $ | 121 |  |  | $ | 123 |
Kentucky Utilities Co [Member] |
Summary of Significant Accounting Policies [Line Items] |
Intercompany tax receivables (payables) | At December 31, the following intercompany tax receivables (payables) were recorded:
| 2018 |  | 2017
PPL Electric | $ | 19 |  |  | $ | 61 |
LKE | (16 | ) |  | (23 | )
LG&E | — |  |  | — |
KU | (5 | ) |  | — |
Schedule of Utility Inventory | "Fuel, materials and supplies" on the Balance Sheets consisted of the following at December 31:
| PPL |  | LKE |  | LG&E |  | KU
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Fuel | $ | 98 |  |  | $ | 107 |  |  | $ | 98 |  |  | $ | 107 |  |  | $ | 42 |  |  | $ | 45 |  |  | $ | 56 |  |  | $ | 62 |
Natural gas stored underground | 41 |  |  | 43 |  |  | 41 |  |  | 43 |  |  | 41 |  |  | 43 |  |  | — |  |  | — |
Materials and supplies | 164 |  |  | 170 |  |  | 109 |  |  | 104 |  |  | 44 |  |  | 43 |  |  | 65 |  |  | 61 |
Total | $ | 303 |  |  | $ | 320 |  |  | $ | 248 |  |  | $ | 254 |  |  | $ | 127 |  |  | $ | 131 |  |  | $ | 121 |  |  | $ | 123 |

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