Regulatory Matters (Regulatory Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Regulatory Assets [Line Items]
Regulatory assets	$ 7,550	$ 6,821
Less amount included in Current Assets	(170)	(50)
Regulatory assets, noncurrent	7,380	6,771
Securitized regulatory assets	619	690
Recoverable undepreciated costs on retiring plants
Regulatory Assets [Line Items]
Regulatory assets	3,146	2,986
Pension
Regulatory Assets [Line Items]
Regulatory assets	1,281	1,315
Other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	90	91
Fermi 2 asset retirement obligation
Regulatory Assets [Line Items]
Regulatory assets	895	951
Removal costs asset
Regulatory Assets [Line Items]
Regulatory assets	700	501
Enhanced tree trimming program deferred costs
Regulatory Assets [Line Items]
Regulatory assets	340	211
Renewable ITC offset
Regulatory Assets [Line Items]
Regulatory assets	207	89
Recoverable income taxes related to AFUDC equity
Regulatory Assets [Line Items]
Regulatory assets	148	116
Energy Waste Reduction incentive
Regulatory Assets [Line Items]
Regulatory assets	115	102
Accrued PSCR/GCR revenue
Regulatory Assets [Line Items]
Regulatory assets	112	0
Recoverable Michigan income taxes
Regulatory Assets [Line Items]
Regulatory assets	107	119
Ludington contract dispute costs
Regulatory Assets [Line Items]
Regulatory assets	58	31
Energy Waste Reduction
Regulatory Assets [Line Items]
Regulatory assets	57	36
Deferred environmental costs
Regulatory Assets [Line Items]
Regulatory assets	39	43
Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Regulatory assets	33	38
Customer360 deferred costs
Regulatory Assets [Line Items]
Regulatory assets	29	34
Other
Regulatory Assets [Line Items]
Regulatory assets	193	158
DTE Electric
Regulatory Assets [Line Items]
Regulatory assets	6,979	6,226
Less amount included in Current Assets	(158)	(39)
Regulatory assets, noncurrent	6,821	6,187
Securitized regulatory assets	619	690
DTE Electric | Recoverable undepreciated costs on retiring plants
Regulatory Assets [Line Items]
Regulatory assets	3,146	2,986
DTE Electric | Pension
Regulatory Assets [Line Items]
Regulatory assets	949	971
DTE Electric | Other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	0	0
DTE Electric | Fermi 2 asset retirement obligation
Regulatory Assets [Line Items]
Regulatory assets	895	951
DTE Electric | Removal costs asset
Regulatory Assets [Line Items]
Regulatory assets	700	501
DTE Electric | Enhanced tree trimming program deferred costs
Regulatory Assets [Line Items]
Regulatory assets	340	211
DTE Electric | Renewable ITC offset
Regulatory Assets [Line Items]
Regulatory assets	207	89
DTE Electric | Recoverable income taxes related to AFUDC equity
Regulatory Assets [Line Items]
Regulatory assets	139	107
DTE Electric | Energy Waste Reduction incentive
Regulatory Assets [Line Items]
Regulatory assets	94	82
DTE Electric | Accrued PSCR/GCR revenue
Regulatory Assets [Line Items]
Regulatory assets	111	0
DTE Electric | Recoverable Michigan income taxes
Regulatory Assets [Line Items]
Regulatory assets	89	99
DTE Electric | Ludington contract dispute costs
Regulatory Assets [Line Items]
Regulatory assets	58	31
DTE Electric | Energy Waste Reduction
Regulatory Assets [Line Items]
Regulatory assets	52	29
DTE Electric | Deferred environmental costs
Regulatory Assets [Line Items]
Regulatory assets	0	0
DTE Electric | Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Regulatory assets	26	29
DTE Electric | Customer360 deferred costs
Regulatory Assets [Line Items]
Regulatory assets	29	34
DTE Electric | Other
Regulatory Assets [Line Items]
Regulatory assets	$ 144	$ 106