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SCHEDULE I - CONDENSED UNCONSOLIDATED STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Unconsolidated Financial Statements [Line Items] |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations | $ 2,461 | $ 2,890 | $ 2,272
Cash Flows from Operating Activities [Abstract] |  |  |
Net cash provided by (used in) operating activities | 2,461 | 2,890 | 2,615
Cash Flows from Investing Activities [Abstract] |  |  |
Net cash provided by (used in) investing activities | (3,156) | (2,918) | (3,588)
Cash Flows from Financing Activities [Abstract] |  |  |
Issuance of equity, net of issuance costs | 453 | 144 | 203
Net increase (decrease) in short-term debt | 115 | 29 | 94
Retirement of long-term debt | (168) | (930) | (1,000)
Issuance of long-term debt | 1,515 | 1,342 | 2,236
Payment of common stock dividends | (1,072) | (1,030) | (1,004)
Other | (19) | 6 | (47)
Net cash provided by (used in) financing activities - continuing operations | 824 | (439) | 482
Net cash provided by (used in) financing activities | 824 | (439) | 68
Net Increase (Decrease) in Cash and Cash Equivalents | 144 | (495) | (563)
Cash and Cash Equivalents at Beginning of Period | 341 | 836 | 1,399
Cash and Cash Equivalents at End of Period | 485 | 341 | 836
PPL Corp [Member] |  |  |
Cash Flows from Operating Activities [Abstract] |  |  |
Net cash provided by (used in) operating activities | 1,108 | 1,563 | 993
Cash Flows from Investing Activities [Abstract] |  |  |
Capital contributions to affiliated subsidiaries | (585) | (308) | (491)
Return of capital from affiliated subsidiaries | 0 | 0 | 112
Net cash provided by (used in) investing activities | (585) | (308) | (379)
Cash Flows from Financing Activities [Abstract] |  |  |
Issuance of equity, net of issuance costs | 453 | 144 | 203
Net increase (decrease) in short-term debt with affiliates | 113 | (341) | 215
Payment of common stock dividends | (1,072) | (1,030) | (1,004)
Other | (21) | (24) | (28)
Net cash provided by (used in) financing activities | (527) | (1,251) | (614)
Cash and Cash Equivalents at Beginning of Period | 4 | 0 | 0
Cash and Cash Equivalents at End of Period | 0 | 4 | 0
Supplemental Disclosures of Cash Flow Information: [Abstract] |  |  |
Cash Dividends Received from Subsidiaries | 1,253 | 1,510 | 1,198
L G And E And K U Energy L L C Unconsolidated [Member] |  |  |
Condensed Unconsolidated Financial Statements [Line Items] |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations | 401 | 285 | 246
Cash Flows from Investing Activities [Abstract] |  |  |
Capital contributions to affiliated subsidiaries | (30) | (91) | (140)
Net decrease in notes receivable from affiliates | (28) | 47 | 73
Net cash provided by (used in) investing activities | (58) | (44) | (67)
Cash Flows from Financing Activities [Abstract] |  |  |
Net increase (decrease) in notes payable to affiliates | 58 | 90 | 315
Net increase (decrease) in short-term debt | 0 | (75) | 0
Retirement of long-term debt | 0 | 0 | (400)
Contributions from member | 0 | 61 | 125
Distributions to member | (402) | (316) | (219)
Net cash provided by (used in) financing activities | (344) | (240) | (179)
Net Increase (Decrease) in Cash and Cash Equivalents | (1) | 1 | 0
Cash and Cash Equivalents at Beginning of Period | 1 | 0 | 0
Cash and Cash Equivalents at End of Period | 0 | 1 | 0
Supplemental Disclosures of Cash Flow Information: [Abstract] |  |  |
Cash Dividends Received from Subsidiaries | $ 418 | $ 376 | $ 272

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