Supplementary Quarterly Financial Information (Unaudited) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Operating Revenue	$ 2,533	$ 2,387	$ 2,225	$ 2,516	$ 2,349	$ 2,190	$ 2,013	$ 2,239	$ 9,661	$ 8,791	$ 8,858
Operating Income (Loss)	241	329	223	410	267	406	294	312	1,203	1,279	1,421
Income (Loss) from Continuing Operations Attributable to Parent					137	226	147	156		666
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent					(56)	1	(1)	0	0	(56)	(3)
Net Income Attributable to DTE Energy Company	$ 124	$ 198	$ 105	$ 234	$ 81	$ 227	$ 146	$ 156	$ 661	$ 610	$ 711
Income (Loss) from Continuing Operations, Per Basic Share					$ 0.79	$ 1.31	$ 0.87	$ 0.91	$ 3.76	$ 3.89	$ 4.21
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share					$ (0.32)	$ 0.01	$ (0.01)	$ 0.00	$ 0.00	$ (0.33)	$ (0.02)
Total Basic Earnings per Common Share	$ 0.70	$ 1.13	$ 0.60	$ 1.35	$ 0.47	$ 1.32	$ 0.86	$ 0.91	$ 3.76	$ 3.56	$ 4.19
Income (Loss) from Continuing Operations, Per Diluted Share					$ 0.79	$ 1.30	$ 0.87	$ 0.91	$ 3.76	$ 3.88	$ 4.20
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share					$ (0.32)	$ 0.01	$ (0.01)	$ 0	$ 0.00	$ (0.33)	$ (0.02)
Total Diluted Earnings per Common Share	$ 0.70	$ 1.13	$ 0.60	$ 1.34	$ 0.47	$ 1.31	$ 0.86	$ 0.91	$ 3.76	$ 3.55	$ 4.18