Regulatory Matters (Schedule of Regulatory Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Regulatory Assets [Line Items]
Regulatory assets	$ 4,176	$ 4,721
Less amount included in Current Assets	(5)	(153)
Regulatory assets, noncurrent	4,171	4,568
Pension
Regulatory Assets [Line Items]
Regulatory assets	1,983	1,961
Other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	201	213
Fermi 2 asset retirement obligation
Regulatory Assets [Line Items]
Regulatory assets	669	778
Recoverable undepreciated costs on retiring plants
Regulatory Assets [Line Items]
Regulatory assets	657	630
Recoverable Michigan income taxes
Regulatory Assets [Line Items]
Regulatory assets	189	201
Deferred environmental costs
Regulatory Assets [Line Items]
Regulatory assets	66	69
Recoverable income taxes related to AFUDC equity
Regulatory Assets [Line Items]
Regulatory assets	56	51
Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Regulatory assets	56	60
Customer360 deferred costs
Regulatory Assets [Line Items]
Regulatory assets	55	42
Energy Waste Reduction incentive
Regulatory Assets [Line Items]
Regulatory assets	54	49
Nuclear Performance Evaluation and Review Committee Tracker
Regulatory Assets [Line Items]
Regulatory assets	48	43
Enhanced Tree Trimming Program deferred costs
Regulatory Assets [Line Items]
Regulatory assets	43	0
Other recoverable income taxes
Regulatory Assets [Line Items]
Regulatory assets	20	23
Non-service pension and other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	15	10
Transitional Reconciliation Mechanism
Regulatory Assets [Line Items]
Regulatory assets	10	21
Accrued PSCR/GCR revenue
Regulatory Assets [Line Items]
Regulatory assets	3	116
Removal costs asset
Regulatory Assets [Line Items]
Regulatory assets	0	407
Other
Regulatory Assets [Line Items]
Regulatory assets	51	47
DTE Electric
Regulatory Assets [Line Items]
Regulatory assets	3,453	3,977
Less amount included in Current Assets	(5)	(148)
Regulatory assets, noncurrent	3,448	3,829
DTE Electric | Pension
Regulatory Assets [Line Items]
Regulatory assets	1,497	1,476
DTE Electric | Other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	131	121
DTE Electric | Fermi 2 asset retirement obligation
Regulatory Assets [Line Items]
Regulatory assets	669	778
DTE Electric | Recoverable undepreciated costs on retiring plants
Regulatory Assets [Line Items]
Regulatory assets	657	630
DTE Electric | Recoverable Michigan income taxes
Regulatory Assets [Line Items]
Regulatory assets	152	161
DTE Electric | Deferred environmental costs
Regulatory Assets [Line Items]
Regulatory assets	0	0
DTE Electric | Recoverable income taxes related to AFUDC equity
Regulatory Assets [Line Items]
Regulatory assets	47	41
DTE Electric | Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Regulatory assets	40	43
DTE Electric | Customer360 deferred costs
Regulatory Assets [Line Items]
Regulatory assets	55	42
DTE Electric | Energy Waste Reduction incentive
Regulatory Assets [Line Items]
Regulatory assets	43	39
DTE Electric | Nuclear Performance Evaluation and Review Committee Tracker
Regulatory Assets [Line Items]
Regulatory assets	48	43
DTE Electric | Enhanced Tree Trimming Program deferred costs
Regulatory Assets [Line Items]
Regulatory assets	43	0
DTE Electric | Other recoverable income taxes
Regulatory Assets [Line Items]
Regulatory assets	20	23
DTE Electric | Non-service pension and other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	0	0
DTE Electric | Transitional Reconciliation Mechanism
Regulatory Assets [Line Items]
Regulatory assets	10	21
DTE Electric | Accrued PSCR/GCR revenue
Regulatory Assets [Line Items]
Regulatory assets	3	116
DTE Electric | Removal costs asset
Regulatory Assets [Line Items]
Regulatory assets	0	407
DTE Electric | Other
Regulatory Assets [Line Items]
Regulatory assets	$ 38	$ 36