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SCHEDULE I - CONDENSED UNCONSOLIDATED STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash Flows from Operating Activities [Abstract] |  |  |
Net cash provided by (used in) operating activities | $ 2,821 | $ 2,461 | $ 2,890
Cash Flows from Investing Activities [Abstract] |  |  |
Net cash provided by (used in) investing activities | (3,361) | (3,161) | (2,926)
Cash Flows from Financing Activities [Abstract] |  |  |
Issuance of equity, net of issuance costs | 698 | 453 | 144
Net increase (decrease) in short-term debt | 363 | 115 | 29
Retirement of long-term debt | (277) | (168) | (930)
Issuance of long-term debt | 1,059 | 1,515 | 1,342
Payment of common stock dividends | (1,133) | (1,072) | (1,030)
Other | (20) | (19) | 6
Net cash provided by (used in) financing activities | 690 | 824 | (439)
Cash and Cash Equivalents at Beginning of Period | 485 |  |
Cash and Cash Equivalents at End of Period | 621 | 485 |
LG&E and KU Energy LLC Unconsolidated [Member] |  |  |
Condensed Unconsolidated Financial Statements [Line Items] |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations | 346 | 401 | 285
Cash Flows from Investing Activities [Abstract] |  |  |
Capital contributions to affiliated subsidiaries | (128) | (30) | (91)
Net decrease (increase) in notes receivable from affiliates | (26) | (28) | 47
Net cash provided by (used in) investing activities | (154) | (58) | (44)
Cash Flows from Financing Activities [Abstract] |  |  |
Net increase (decrease) in notes payable to affiliates | 110 | 58 | 90
Net increase (decrease) in short-term debt | 0 | 0 | (75)
Contributions from member | 0 | 0 | 61
Distributions to member | (302) | (402) | (316)
Net cash provided by (used in) financing activities | (192) | (344) | (240)
Net Increase (Decrease) in Cash and Cash Equivalents | 0 | (1) | 1
Cash and Cash Equivalents at Beginning of Period | 0 | 1 | 0
Cash and Cash Equivalents at End of Period | 0 | 0 | 1
Supplemental Disclosures of Cash Flow Information: [Abstract] |  |  |
Cash Dividends Received from Subsidiaries | $ 402 | $ 418 | $ 376

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