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SCHEDULE I - CONDENSED UNCONSOLIDATED STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flows from Investing Activities [Abstract] |  |  |
Net cash provided by (used in) investing activities | $ (3,258) | $ (3,080) | $ (3,361)
Cash Flows from Financing Activities [Abstract] |  |  |
Issuance of equity, net of issuance costs | 34 | 1,167 | 698
Net increase (decrease) in short-term debt | 127 | (278) | 363
Retirement of long-term debt | (1,172) | (300) | (277)
Issuance of long-term debt | 2,167 | 1,465 | 1,059
Payment of common stock dividends | (1,275) | (1,192) | (1,133)
Other | (41) | (26) | (20)
Net cash provided by (used in) financing activities | 386 | 836 | 690
Cash and Cash Equivalents at Beginning of Period | 815 |  |
Cash and Cash Equivalents at End of Period | 708 | 815 |
LG&E and KU Energy LLC Unconsolidated [Member] |  |  |
Cash Flows from Operating Activities [Abstract] |  |  |
Net Cash Provided by (Used in) Operating Activities, Continuing Operations | 371 | 368 | 346
Cash Flows from Investing Activities [Abstract] |  |  |
Capital contributions to affiliated subsidiaries | (231) | (93) | (128)
Net decrease (increase) in notes receivable from affiliates | 5 | (44) | (26)
Net cash provided by (used in) investing activities | (226) | (137) | (154)
Cash Flows from Financing Activities [Abstract] |  |  |
Net increase (decrease) in notes payable to affiliates | 613 | 14 | 110
Retirement of long-term debt | (475) | 0 | 0
Contributions from member | 0 | 63 | 0
Distributions to member | (283) | (308) | (302)
Net cash provided by (used in) financing activities | (145) | (231) | (192)
Net Increase (Decrease) in Cash and Cash Equivalents | 0 | 0 | 0
Cash and Cash Equivalents at Beginning of Period | 0 | 0 | 0
Cash and Cash Equivalents at End of Period | 0 | 0 | 0
Supplemental Disclosures of Cash Flow Information: [Abstract] |  |  |
Cash Dividends Received from Subsidiaries | 361 | 411 | 402
LG And E And KU Energy LLC [Member] |  |  |
Cash Flows from Investing Activities [Abstract] |  |  |
Net cash provided by (used in) investing activities | (963) | (1,094) | (1,116)
Cash Flows from Financing Activities [Abstract] |  |  |
Net increase (decrease) in notes payable to affiliates | 101 | 37 | (112)
Net increase (decrease) in short-term debt | 4 | (126) | 270
Retirement of long-term debt | (975) | (200) | (27)
Issuance of long-term debt | 498 | 705 | 118
Contributions from member | 0 | 63 | 0
Other | (6) | (12) | (2)
Net cash provided by (used in) financing activities | (38) | 159 | 195
Cash and Cash Equivalents at Beginning of Period | 27 | 24 | 30
Cash and Cash Equivalents at End of Period | $ 29 | $ 27 | $ 24

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