Regulatory Matters (Schedule of Regulatory Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Regulatory Assets [Line Items]
Regulatory assets	$ 3,778	$ 3,913
Less amount included in Current Assets	(55)	(42)
Regulatory assets, noncurrent	3,723	3,871
Pension
Regulatory Assets [Line Items]
Regulatory assets	2,000	2,159
Other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	278	286
Asset retirement obligation
Regulatory Assets [Line Items]
Regulatory assets	569	613
Removal costs asset
Regulatory Assets [Line Items]
Regulatory assets	299	193
Recoverable Michigan income taxes
Regulatory Assets [Line Items]
Regulatory assets	213	231
Deferred environmental costs
Regulatory Assets [Line Items]
Regulatory assets	75	78
Unamortized loss on reacquired debt
Regulatory Assets [Line Items]
Regulatory assets	65	59
Transitional Reconciliation Mechanism
Regulatory Assets [Line Items]
Regulatory assets	46	30
Customer360 deferred costs
Regulatory Assets [Line Items]
Regulatory assets	45	33
Recoverable income taxes related to AFUDC equity
Regulatory Assets [Line Items]
Regulatory assets	41	59
Other recoverable income taxes
Regulatory Assets [Line Items]
Regulatory assets	26	57
Nuclear Performance Evaluation and Review Committee Tracker
Regulatory Assets [Line Items]
Regulatory assets	22	0
Accrued PSCR/GCR revenue
Regulatory Assets [Line Items]
Regulatory assets	17	22
Other
Regulatory Assets [Line Items]
Regulatory assets	82	93
DTE Electric
Regulatory Assets [Line Items]
Regulatory assets	3,055	3,149
Less amount included in Current Assets	(50)	(36)
Regulatory assets, noncurrent	3,005	3,113
DTE Electric | Pension
Regulatory Assets [Line Items]
Regulatory assets	1,502	1,642
DTE Electric | Other postretirement costs
Regulatory Assets [Line Items]
Regulatory assets	211	207
DTE Electric | Asset retirement obligation
Regulatory Assets [Line Items]
Regulatory assets	569	613
DTE Electric | Removal costs asset
Regulatory Assets [Line Items]
Regulatory assets	299	193
DTE Electric | Recoverable Michigan income taxes
Regulatory Assets [Line Items]
Regulatory assets	171	187
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	46	39
DTE Electric | Transitional Reconciliation Mechanism
Regulatory Assets [Line Items]
Regulatory assets	46	30
DTE Electric | Customer360 deferred costs
Regulatory Assets [Line Items]
Regulatory assets	45	33
DTE Electric | Recoverable income taxes related to AFUDC equity
Regulatory Assets [Line Items]
Regulatory assets	35	53
DTE Electric | Other recoverable income taxes
Regulatory Assets [Line Items]
Regulatory assets	26	57
DTE Electric | Nuclear Performance Evaluation and Review Committee Tracker
Regulatory Assets [Line Items]
Regulatory assets	22	0
DTE Electric | Accrued PSCR/GCR revenue
Regulatory Assets [Line Items]
Regulatory assets	17	19
DTE Electric | Other
Regulatory Assets [Line Items]
Regulatory assets	$ 66	$ 76