Related Party Transactions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Dividends declared	$ 602,000,000	$ 548,000,000	$ 510,000,000
Dividends paid	592,000,000	531,000,000	501,000,000
DTE Electric
Related Party Transaction [Line Items]
Other services	(4,000,000)	(1,000,000)	6,000,000
Dividends declared	432,000,000	420,000,000	395,000,000
Dividends paid	432,000,000	420,000,000	395,000,000
DTE Electric | Energy sales
Related Party Transaction [Line Items]
Revenues	9,000,000	10,000,000	2,000,000
DTE Electric | Shared capital assets
Related Party Transaction [Line Items]
Revenues	39,000,000	33,000,000	33,000,000
DTE Electric | Fuel and purchased power
Related Party Transaction [Line Items]
Costs	6,000,000	10,000,000	9,000,000
DTE Electric | Other services and interest
Related Party Transaction [Line Items]
Costs	(2,000,000)	(1,000,000)	2,000,000
DTE Electric | Corporate expenses, net
Related Party Transaction [Line Items]
Costs	370,000,000	370,000,000	334,000,000
DTE Electric | DTE Energy
Related Party Transaction [Line Items]
Dividends declared	432,000,000	420,000,000	395,000,000
Dividends paid	432,000,000	420,000,000	395,000,000
Capital contribution from DTE Energy	100,000,000	120,000,000	300,000,000
DTE Electric | DTE Energy Foundation
Related Party Transaction [Line Items]
Charitable contributions to foundation	$ 7,000,000	$ 0	$ 0