Significant Accounting Policies (Roll-Forward of Activity for Financing Receivables Credit Loss Reserves) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 79	$ 92	$ 104
Current period provision	52	49	54
Write-offs charged against allowance	(112)	(107)	(127)
Recoveries of amounts previously written off	44	45	61
Ending balance	63	79	92
DTE Electric
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	49	54	57
Current period provision	36	33	36
Write-offs charged against allowance	(72)	(66)	(77)
Recoveries of amounts previously written off	28	28	38
Ending balance	41	49	54
Trade accounts receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	78	89	101
Current period provision	52	49	53
Write-offs charged against allowance	(112)	(105)	(126)
Recoveries of amounts previously written off	44	45	61
Ending balance	62	78	89
Other receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1	3	3
Current period provision	0	0	1
Write-offs charged against allowance	0	(2)	(1)
Recoveries of amounts previously written off	0	0	0
Ending balance	$ 1	$ 1	$ 3