Regulatory Matters (Schedule of Regulatory Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Regulatory Assets [Line Items]
Regulatory assets	$ 4,721	$ 3,778
Less amount included in Current Assets	(153)	(55)
Regulatory assets, noncurrent	4,568	3,723
Pension
Regulatory Assets [Line Items]
Regulatory assets	1,961	2,000
Other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	213	278
Asset retirement obligation
Regulatory Assets [Line Items]
Regulatory assets	778	569
Recoverable undepreciated costs on retiring plants
Regulatory Assets [Line Items]
Regulatory assets	630	0
Removal costs asset
Regulatory Assets [Line Items]
Regulatory assets	407	299
Recoverable Michigan income taxes
Regulatory Assets [Line Items]
Regulatory assets	201	213
Accrued PSCR/GCR revenue
Regulatory Assets [Line Items]
Regulatory assets	116	17
Deferred environmental costs
Regulatory Assets [Line Items]
Regulatory assets	69	75
Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Regulatory assets	60	65
Recoverable income taxes related to AFUDC equity
Regulatory Assets [Line Items]
Regulatory assets	51	41
Energy Waste Reduction incentive
Regulatory Assets [Line Items]
Regulatory assets	49	39
Nuclear Performance Evaluation and Review Committee Tracker
Regulatory Assets [Line Items]
Regulatory assets	43	22
Customer360 deferred costs
Regulatory Assets [Line Items]
Regulatory assets	42	45
Other recoverable income taxes
Regulatory Assets [Line Items]
Regulatory assets	23	26
Transitional Reconciliation Mechanism
Regulatory Assets [Line Items]
Regulatory assets	21	46
Other
Regulatory Assets [Line Items]
Regulatory assets	57	43
DTE Electric
Regulatory Assets [Line Items]
Regulatory assets	3,977	3,055
Less amount included in Current Assets	(148)	(50)
Regulatory assets, noncurrent	3,829	3,005
DTE Electric | Pension
Regulatory Assets [Line Items]
Regulatory assets	1,476	1,502
DTE Electric | Other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	121	211
DTE Electric | Asset retirement obligation
Regulatory Assets [Line Items]
Regulatory assets	778	569
DTE Electric | Recoverable undepreciated costs on retiring plants
Regulatory Assets [Line Items]
Regulatory assets	630	0
DTE Electric | Removal costs asset
Regulatory Assets [Line Items]
Regulatory assets	407	299
DTE Electric | Recoverable Michigan income taxes
Regulatory Assets [Line Items]
Regulatory assets	161	171
DTE Electric | Accrued PSCR/GCR revenue
Regulatory Assets [Line Items]
Regulatory assets	116	17
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	43	46
DTE Electric | Recoverable income taxes related to AFUDC equity
Regulatory Assets [Line Items]
Regulatory assets	41	35
DTE Electric | Energy Waste Reduction incentive
Regulatory Assets [Line Items]
Regulatory assets	39	30
DTE Electric | Nuclear Performance Evaluation and Review Committee Tracker
Regulatory Assets [Line Items]
Regulatory assets	43	22
DTE Electric | Customer360 deferred costs
Regulatory Assets [Line Items]
Regulatory assets	42	45
DTE Electric | Other recoverable income taxes
Regulatory Assets [Line Items]
Regulatory assets	23	26
DTE Electric | Transitional Reconciliation Mechanism
Regulatory Assets [Line Items]
Regulatory assets	21	46
DTE Electric | Other
Regulatory Assets [Line Items]
Regulatory assets	$ 36	$ 36