Supplementary Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Entity Information [Line Items]
Operating Revenues	$ 3,750	$ 3,550	$ 3,159	$ 3,753	$ 3,271	$ 3,245	$ 2,855	$ 3,236	$ 14,212	$ 12,607	$ 10,630
Operating Income	332	429	329	504	372	434	320	585	1,594	1,711	1,486
Net Income	$ 191	$ 334	$ 234	$ 361	$ 287	$ 270	$ 177	$ 400	$ 1,120	$ 1,134	$ 868
Basic Earnings per Share (in dollars per share)	$ 1.05	$ 1.84	$ 1.29	$ 2.01	$ 1.60	$ 1.51	$ 0.99	$ 2.23	$ 6.18	$ 6.32	$ 4.84
Diluted Earnings per Share (in dollars per share)	$ 1.05	$ 1.84	$ 1.29	$ 2.00	$ 1.60	$ 1.51	$ 0.99	$ 2.23	$ 6.17	$ 6.32	$ 4.83
Effect of the Tax Cuts and Jobs Act of 2017					$ (105)				$ 21	$ (105)	$ 0
DTE Electric
Entity Information [Line Items]
Operating Revenues	$ 1,296	$ 1,521	$ 1,276	$ 1,205	1,275	$ 1,434	$ 1,218	$ 1,175	5,298	5,102
Operating Income	168	444	269	253	281	395	272	217	1,134	1,165	1,204
Net Income	$ 56	$ 305	$ 163	$ 140	$ 138	$ 219	$ 138	$ 106	664	601	622
Effect of the Tax Cuts and Jobs Act of 2017									$ 7	$ 0	$ 0