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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