Organization and Basis of Presentation (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
ASSETS
Cash and cash equivalents	$ 33	$ 208
Restricted cash	44	42
Accounts receivable	1,641	2,031
Securitized regulatory assets	564	619
Total Assets	57,594	54,066
LIABILITIES
Accrued interest	351	273
Regulatory liabilities — current	96	107
DTE Electric
ASSETS
Cash and cash equivalents	6	81
Restricted cash	44	42
Securitized regulatory assets	564	619
Total Assets	42,237	38,990
LIABILITIES
Accrued interest	162	135
Regulatory liabilities — current	70	63
Variable interest entity, primary beneficiary
ASSETS
Cash and cash equivalents	5	5
Restricted cash	44	42
Accounts receivable	9	10
Securitized regulatory assets	564	619
Notes receivable	64	68
Other current and long-term assets	1	1
Total Assets	687	745
LIABILITIES
Accrued interest	3	11
Regulatory liabilities — current	31	23
Securitization bonds	583	636
Other current and long-term liabilities	3	4
Total liabilities	620	674
Notes receivable	2	2
Current portion of securitization bonds	58	75
Variable interest entity, primary beneficiary | DTE Electric
ASSETS
Cash and cash equivalents	0	0
Restricted cash	44	42
Accounts receivable	5	6
Securitized regulatory assets	564	619
Notes receivable	0	0
Other current and long-term assets	0	0
Total Assets	613	667
LIABILITIES
Accrued interest	3	11
Regulatory liabilities — current	31	23
Securitization bonds	583	636
Other current and long-term liabilities	0	0
Total liabilities	617	670
Current portion of securitization bonds	$ 58	$ 75