Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 124	$ 105	$ 450	$ 339
Average number of common shares outstanding	177	174	177	174
Weighted average net restricted shares outstanding	0	1	0	1
Dividends declared - common shares	116	114	231	222
Dividends declared - net restricted shares	0	1	1	0
Total distributed earnings	116	115	232	222
Net income less distributed earnings	8	(10)	218	117
Distributed (dividends per common share)	$ 0.66	$ 0.66	$ 1.31	$ 1.28
Undistributed	$ 0.04	$ (0.06)	$ 1.23	$ 0.66
Total Basic Earnings per Common Share	$ 0.70	$ 0.60	$ 2.54	$ 1.94
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	124	105	450	339
Common shares for dilutive calculation	177	175	177	174
Weighted average net restricted shares outstanding	0	1	0	1
Dividends declared - common shares	116	114	231	222
Dividends declared - net restricted shares	0	1	1	0
Total distributed earnings	116	115	232	222
Net income less distributed earnings	$ 8	$ (10)	$ 218	$ 117
Distributed (dividends per common share)	$ 0.66	$ 0.66	$ 1.31	$ 1.28
Undistributed	$ 0.04	$ (0.06)	$ 1.23	$ 0.66
Total Diluted Earnings per Common Share	$ 0.70	$ 0.60	$ 2.54	$ 1.94