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Acquisition (Cost Allocated to Underlying Net Assets) (Details) - DTE Sustainable Generation - Electric - Osaka Gas USA Corporation
$ in Millions
Aug. 14, 2025
USD ($)
Business Combination [Line Items]  
Cash $ 6
Property, plant, and equipment, net 135
Working capital, other assets and liabilities 18
Total 216
Contract intangibles  
Business Combination [Line Items]  
Contract intangibles $ 57