Organization and Basis of Presentation (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
ASSETS
Cash and cash equivalents	$ 238	$ 208
Restricted cash	40	42
Accounts receivable	1,916	2,031
Securitized regulatory assets	601	619
Total Assets	55,108	54,066
LIABILITIES
Accrued interest	337	273
Regulatory liabilities — current	56	107
DTE Electric
ASSETS
Cash and cash equivalents	80	81
Restricted cash	40	42
Securitized regulatory assets	601	619
Total Assets	40,354	38,990
LIABILITIES
Accrued interest	165	135
Regulatory liabilities — current	50	63
Variable interest entity, primary beneficiary
ASSETS
Cash and cash equivalents	7	5
Restricted cash	40	42
Accounts receivable	10	10
Securitized regulatory assets	601	619
Notes receivable	66	68
Other current and long-term assets	0	1
Total Assets	724	745
LIABILITIES
Accrued interest	4	11
Regulatory liabilities — current	24	23
Securitization bonds	620	636
Other current and long-term liabilities	4	4
Total liabilities	652	674
Notes receivable	2	2
Current portion of securitization bonds	75	75
Variable interest entity, primary beneficiary | DTE Electric
ASSETS
Cash and cash equivalents	0	0
Restricted cash	40	42
Accounts receivable	4	6
Securitized regulatory assets	601	619
Notes receivable	0	0
Other current and long-term assets	0	0
Total Assets	645	667
LIABILITIES
Accrued interest	4	11
Regulatory liabilities — current	24	23
Securitization bonds	620	636
Other current and long-term liabilities	0	0
Total liabilities	648	670
Current portion of securitization bonds	$ 75	$ 75