Supplementary Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Entity Information [Line Items]
Operating Revenues	$ 3,148	$ 3,119	$ 2,888	$ 3,514	$ 3,750	$ 3,550	$ 3,159	$ 3,753	$ 12,669	$ 14,212	$ 12,607
Operating Income	415	450	300	542	332	429	329	504	1,707	1,594	1,711
Net Income	$ 267	$ 319	$ 182	$ 401	$ 191	$ 334	$ 234	$ 361	$ 1,169	$ 1,120	$ 1,134
Basic Earnings per Share (in dollars per share)	$ 1.40	$ 1.74	$ 0.99	$ 2.20	$ 1.05	$ 1.84	$ 1.29	$ 2.01	$ 6.32	$ 6.18	$ 6.32
Diluted Earnings per Share (in dollars per share)	$ 1.40	$ 1.73	$ 0.99	$ 2.19	$ 1.05	$ 1.84	$ 1.29	$ 2.00	$ 6.31	$ 6.17	$ 6.32
DTE Electric
Entity Information [Line Items]
Operating Revenues	$ 1,280	$ 1,519	$ 1,190	$ 1,235	$ 1,296	$ 1,521	$ 1,276	$ 1,205	$ 5,224	$ 5,298
Operating Income	224	440	223	226	168	444	269	253	1,113	1,134	$ 1,165
Net Income	$ 129	$ 307	$ 133	$ 147	$ 56	$ 305	$ 163	$ 140	$ 716	$ 664	$ 601