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Acquisition (Cost Allocated to Underlying Net Assets) (Details) - DTE Sustainable Generation - Electric - Osaka Gas USA Corporation - USD ($) $ in Millions | Sep. 30, 2025 | Aug. 14, 2025
--- | --- | ---
Business Combination [Line Items] |  |
Cash |  | $ 5
Property, plant, and equipment, net |  | 135
Working capital, other assets and liabilities |  | 19
Total | $ 216 | 216
Contract intangibles |  |
Business Combination [Line Items] |  |
Contract intangibles |  | $ 57

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