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Acquisitions, Development and Divestitures	12 Months Ended
Acquisitions, Development and Divestitures	Dec. 31, 2025
Contractors [Abstract]
Mergers, Acquisitions and Dispositions Disclosures	9. Acquisitions, Development and Divestitures (PPL) Acquisitions Acquisition of Narragansett Electric On May 25, 2022, PPL Rhode Island Holdings acquired 100% of the outstanding shares of common stock of Narragansett Electric from National Grid U.S., a subsidiary of National Grid plc (the Acquisition). Narragansett Electric, whose service area covers substantially all of Rhode Island, is primarily engaged in the transmission and distribution of electricity and distribution of natural gas. In connection with the Acquisition, National Grid USA Service Company, Inc., National Grid U.S. and Narragansett Electric entered into a transition services agreement (TSA), pursuant to which the National Grid entities agreed to provide certain transition services to Narragansett Electric to facilitate the transition of the operation of Narragansett Electric to PPL following the Acquisition, as agreed upon in the Narragansett share purchase agreement. The TSA was for an initial two-year term and was completed in the third quarter of 2024. TSA costs of $137 million and $228 million were incurred for the years ended December 31, 2024 and 2023. RIE will not seek to recover in rates any markup charged by National Grid U.S. and/or its affiliates under the TSA which were $10 million, and $7 million for the years ended December 31, 2024 and 2023. As a condition to the Acquisition, RIE will forgo potential recovery of any and all transition costs, which includes (1) the installation of certain information technology systems; (2) modification and enhancements to physical facilities in Rhode Island; and (3) severance payments, communications and branding changes, and other transition related costs. These costs, which are being expensed as incurred, were $71 million, $307 million, and $262 million for the years ended December 31, 2025, 2024, and 2023. Developments (PPL, LG&E and KU) Mill Creek Unit 5 Construction In December 2022, LG&E and KU filed a CPCN with the KPSC requesting approval to construct a 645 MW net summer rating Natural Gas Combined Cycle (NGCC) combustion turbine at LG&E's Mill Creek Generating Station. In November 2023, the KPSC issued an order approving the request as well as the requested AFUDC accounting treatment for associated financing costs relating to the NGCC. The new NGCC facility will be jointly owned by LG&E (31%) and KU (69%). In February 2024, LG&E and KU entered into agreements to begin construction of Mill Creek Unit 5. Total project costs are estimated at approximately $1.0 billion, including AFUDC. Commercial operation of the facility is anticipated to begin in mid-2027.