Supplementary Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Entity Information [Line Items]
Operating Revenues	$ 3,288	$ 3,284	$ 2,583	$ 3,022	$ 3,148	$ 3,119	$ 2,888	$ 3,514	$ 12,177	$ 12,669	$ 14,212
Operating Income	465	608	367	546	415	450	300	542	1,986	1,707	1,594
Net Income	$ 275	$ 476	$ 277	$ 340	$ 267	$ 319	$ 182	$ 401	$ 1,368	$ 1,169	$ 1,120
Basic Earnings per Share (in dollars per share)	$ 1.42	$ 2.47	$ 1.44	$ 1.77	$ 1.40	$ 1.74	$ 0.99	$ 2.20	$ 7.09	$ 6.32	$ 6.18
Diluted Earnings per Share (in dollars per share)	$ 1.42	$ 2.46	$ 1.44	$ 1.76	$ 1.40	$ 1.73	$ 0.99	$ 2.19	$ 7.08	$ 6.31	$ 6.17
DTE Electric
Entity Information [Line Items]
Operating Revenues	$ 1,295	$ 1,690	$ 1,309	$ 1,212	$ 1,280	$ 1,519	$ 1,190	$ 1,235	$ 5,506	$ 5,224
Operating Income	206	541	263	214	224	440	223	226	1,224	1,113	$ 1,134
Net Income	$ 101	$ 400	$ 183	$ 94	$ 129	$ 307	$ 133	$ 147	$ 778	$ 716	$ 664