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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