Supplementary Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Entity Information [Line Items]
Total operating revenues	$ 2,874	$ 2,928	$ 2,262	$ 2,566	$ 2,487	$ 2,598	$ 2,268	$ 2,984	$ 10,630	$ 10,337	$ 12,301
Operating Income	301	507	256	381	134	440	204	461	1,445	1,239	1,590
Net Income	$ 131	$ 338	$ 152	$ 247	$ 80	$ 265	$ 109	$ 273	$ 868	$ 727	$ 905
Basic Earnings per Share (in dollars per share)	$ 0.73	$ 1.88	$ 0.84	$ 1.38	$ 0.45	$ 1.47	$ 0.61	$ 1.53	$ 4.84	$ 4.05	$ 5.11
Diluted Earnings per Share (in dollars per share)	$ 0.73	$ 1.88	$ 0.84	$ 1.37	$ 0.45	$ 1.47	$ 0.61	$ 1.53	$ 4.83	$ 4.05	$ 5.10
DTE Electric
Entity Information [Line Items]
Total operating revenues	$ 1,249	$ 1,608	$ 1,215	$ 1,153	$ 1,165	$ 1,385	$ 1,147	$ 1,203	$ 5,225	$ 4,900
Operating Income	193	501	265	245	192	400	214	268	1,204	1,074	$ 1,052
Net Income	$ 75	$ 285	$ 135	$ 127	$ 92	$ 216	$ 99	$ 137	$ 622	$ 544	$ 532