Significant Accounting Policies (Roll-Forward of Activity for Financing Receivables Credit Loss Reserves) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 63	$ 79	$ 92
Current period provision	76	52	49
Write-offs charged against allowance	(108)	(112)	(107)
Recoveries of amounts previously written off	41	44	45
Ending balance	72	63	79
DTE Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	41	49	54
Current period provision	49	36	33
Write-offs charged against allowance	(70)	(72)	(66)
Recoveries of amounts previously written off	26	28	28
Ending balance	46	41	49
Trade accounts receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	62	78	89
Current period provision	74	52	49
Write-offs charged against allowance	(108)	(112)	(105)
Recoveries of amounts previously written off	41	44	45
Ending balance	69	62	78
Other receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1	1	3
Current period provision	2	0	0
Write-offs charged against allowance	0	0	(2)
Recoveries of amounts previously written off	0	0	0
Ending balance	$ 3	$ 1	$ 1