v3.25.2
Significant Accounting Policies (Roll-Forward of Activity for Financing Receivables Credit Loss Reserves) (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]    
Beginning reserve balance $ 72 $ 63
Current period provision 45 76
Write-offs charged against allowance (55) (108)
Recoveries of amounts previously written off 19 41
Ending reserve balance 81 72
DTE Electric    
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]    
Beginning reserve balance 46 41
Current period provision 22 49
Write-offs charged against allowance (36) (70)
Recoveries of amounts previously written off 13 26
Ending reserve balance 45 46
Trade accounts receivable    
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]    
Beginning reserve balance 69 62
Current period provision 45 74
Write-offs charged against allowance (55) (108)
Recoveries of amounts previously written off 19 41
Ending reserve balance 78 69
Other receivables    
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]    
Beginning reserve balance 3 1
Current period provision 0 2
Write-offs charged against allowance 0 0
Recoveries of amounts previously written off 0 0
Ending reserve balance $ 3 $ 3