Property, Plant, and Equipment (Capitalized Software) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant, and Equipment [Line Items]
Amortization expense of capitalized software	$ 89	$ 98	$ 77
Gross carrying value of capitalized software	715	770
Accumulated amortization of capitalized software	435	439
DTE Electric
Property, Plant, and Equipment [Line Items]
Amortization expense of capitalized software	83	80	$ 71
Gross carrying value of capitalized software	610	664
Accumulated amortization of capitalized software	$ 365	$ 369