Organization and Basis of Presentation (Variable Interest Entities) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
ASSETS
Cash and cash equivalents	$ 208	$ 24
Restricted cash	42	64
Accounts receivable	2,031	1,690
Securitized regulatory assets	619	690
Total Assets	54,066	48,846	$ 44,755
LIABILITIES
Accounts payable	1,753	1,387
Accrued interest	273	224
Regulatory liabilities — current	107	181
DTE Electric
ASSETS
Cash and cash equivalents	81	11
Restricted cash	42	48
Securitized regulatory assets	619	690
Total Assets	38,990	35,221
LIABILITIES
Accrued interest	135	128
Regulatory liabilities — current	63	156
Variable interest entity, primary beneficiary
ASSETS
Cash and cash equivalents	5	6
Restricted cash	42	64
Accounts receivable	10	27
Securitized regulatory assets	619	690
Notes receivable	68	657
Other current and long-term assets	1	1
Total Assets	745	1,445
LIABILITIES
Accounts payable	0	26
Accrued interest	11	12
Regulatory liabilities — current	23	27
Securitization bonds	636	706
Other current and long-term liabilities	4	20
Total liabilities	674	791
Notes receivable	2	14
Current portion of securitization bonds	75	71
Variable interest entity, primary beneficiary | DTE Electric
ASSETS
Cash and cash equivalents	0	0
Restricted cash	42	48
Accounts receivable	6	6
Securitized regulatory assets	619	690
Notes receivable	0	0
Other current and long-term assets	0	0
Total Assets	667	744
LIABILITIES
Accounts payable	0	0
Accrued interest	11	12
Regulatory liabilities — current	23	27
Securitization bonds	636	706
Other current and long-term liabilities	0	0
Total liabilities	670	745
Current portion of securitization bonds	$ 75	$ 71