Regulatory Matters (Schedule of Regulatory Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Regulatory Assets [Line Items]
Regulatory assets	$ 4,257	$ 4,176
Less amount included in Current Assets	(129)	(5)
Regulatory assets, noncurrent	4,128	4,171
Pension
Regulatory Assets [Line Items]
Regulatory assets	1,938	1,983
Other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	165	201
Recoverable undepreciated costs on retiring plants
Regulatory Assets [Line Items]
Regulatory assets	664	657
Fermi 2 asset retirement obligation
Regulatory Assets [Line Items]
Regulatory assets	645	669
Recoverable Michigan income taxes
Regulatory Assets [Line Items]
Regulatory assets	176	189
Enhanced Tree Trimming Program deferred costs
Regulatory Assets [Line Items]
Regulatory assets	119	43
Accrued PSCR revenue
Regulatory Assets [Line Items]
Regulatory assets	100	3
Recoverable income taxes related to AFUDC equity
Regulatory Assets [Line Items]
Regulatory assets	64	56
Energy Waste Reduction incentive
Regulatory Assets [Line Items]
Regulatory assets	62	54
Deferred environmental costs
Regulatory Assets [Line Items]
Regulatory assets	57	66
Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Regulatory assets	55	56
Nuclear Performance Evaluation and Review Committee Tracker
Regulatory Assets [Line Items]
Regulatory assets	55	48
Customer360 deferred costs
Regulatory Assets [Line Items]
Regulatory assets	51	55
Non-service pension and other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	21	15
Other recoverable income taxes
Regulatory Assets [Line Items]
Regulatory assets	19	20
Transitional Reconciliation Mechanism
Regulatory Assets [Line Items]
Regulatory assets	11	10
Other
Regulatory Assets [Line Items]
Regulatory assets	55	51
DTE Electric
Regulatory Assets [Line Items]
Regulatory assets	3,563	3,453
Less amount included in Current Assets	(123)	(5)
Regulatory assets, noncurrent	3,440	3,448
DTE Electric | Pension
Regulatory Assets [Line Items]
Regulatory assets	1,477	1,497
DTE Electric | Other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	108	131
DTE Electric | Recoverable undepreciated costs on retiring plants
Regulatory Assets [Line Items]
Regulatory assets	664	657
DTE Electric | Fermi 2 asset retirement obligation
Regulatory Assets [Line Items]
Regulatory assets	645	669
DTE Electric | Recoverable Michigan income taxes
Regulatory Assets [Line Items]
Regulatory assets	142	152
DTE Electric | Enhanced Tree Trimming Program deferred costs
Regulatory Assets [Line Items]
Regulatory assets	119	43
DTE Electric | Accrued PSCR revenue
Regulatory Assets [Line Items]
Regulatory assets	100	3
DTE Electric | Recoverable income taxes related to AFUDC equity
Regulatory Assets [Line Items]
Regulatory assets	54	47
DTE Electric | Energy Waste Reduction incentive
Regulatory Assets [Line Items]
Regulatory assets	49	43
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	41	40
DTE Electric | Nuclear Performance Evaluation and Review Committee Tracker
Regulatory Assets [Line Items]
Regulatory assets	55	48
DTE Electric | Customer360 deferred costs
Regulatory Assets [Line Items]
Regulatory assets	51	55
DTE Electric | Non-service pension and other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	0	0
DTE Electric | Other recoverable income taxes
Regulatory Assets [Line Items]
Regulatory assets	19	20
DTE Electric | Transitional Reconciliation Mechanism
Regulatory Assets [Line Items]
Regulatory assets	11	10
DTE Electric | Other
Regulatory Assets [Line Items]
Regulatory assets	$ 28	$ 38