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SCHEDULE I - CONDENSED UNCONSOLIDATED STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash Flows from Operating Activities [Abstract] |  |  |
Net cash provided by (used in) operating activities | $ 2,427 | $ 2,821 | $ 2,461
Cash Flows from Investing Activities [Abstract] |  |  |
Net cash provided by (used in) investing activities | (3,080) | (3,361) | (3,161)
Cash Flows from Financing Activities [Abstract] |  |  |
Issuance of equity, net of issuance costs | 1,167 | 698 | 453
Net increase (decrease) in short-term debt | (278) | 363 | 115
Retirement of long-term debt | (300) | (277) | (168)
Issuance of long-term debt | 1,465 | 1,059 | 1,515
Payment of common stock dividends | (1,192) | (1,133) | (1,072)
Other | (26) | (20) | (19)
Net cash provided by (used in) financing activities | 836 | 690 | 824
Cash and Cash Equivalents at Beginning of Period | 621 |  |
Cash and Cash Equivalents at End of Period | 815 | 621 |
LG&E and KU Energy LLC Unconsolidated [Member] |  |  |
Condensed Unconsolidated Financial Statements [Line Items] |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations | 368 | 346 | 401
Cash Flows from Investing Activities [Abstract] |  |  |
Capital contributions to affiliated subsidiaries | (93) | (128) | (30)
Net decrease (increase) in notes receivable from affiliates | (44) | (26) | (28)
Net cash provided by (used in) investing activities | (137) | (154) | (58)
Cash Flows from Financing Activities [Abstract] |  |  |
Net increase (decrease) in notes payable to affiliates | 14 | 110 | 58
Contributions from member | 63 | 0 | 0
Distributions to member | (308) | (302) | (402)
Net cash provided by (used in) financing activities | (231) | (192) | (344)
Net Increase (Decrease) in Cash and Cash Equivalents | 0 | 0 | (1)
Cash and Cash Equivalents at Beginning of Period | 0 | 0 | 1
Cash and Cash Equivalents at End of Period | 0 | 0 | 0
Supplemental Disclosures of Cash Flow Information: [Abstract] |  |  |
Cash Dividends Received from Subsidiaries | $ 411 | $ 402 | $ 418

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