Earnings Per Share (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 156	$ 198	$ 606	$ 537
Average number of common shares outstanding	177	175	177	174
Weighted average net restricted shares outstanding	0	0	0	1
Dividends declared - common shares	122	115	353	337
Dividends declared - net restricted shares	0	1	1	1
Total distributed earnings	122	116	354	338
Net income less distributed earnings	34	82	252	199
Distributed (dividends per common share)	$ 0.69	$ 0.66	$ 2.00	$ 1.93
Undistributed	$ 0.19	$ 0.47	$ 1.42	$ 1.14
Total Basic Earnings per Common Share	$ 0.88	$ 1.13	$ 3.42	$ 3.07
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	156	198	606	537
Common shares for dilutive calculation	177	176	177	175
Weighted average net restricted shares outstanding	0	0	0	1
Dividends declared - common shares	122	115	353	337
Dividends declared - net restricted shares	0	1	1	1
Total distributed earnings	122	116	354	338
Net income less distributed earnings	$ 34	$ 82	$ 252	$ 199
Distributed (dividends per common share)	$ 0.69	$ 0.66	$ 2.00	$ 1.93
Undistributed	$ 0.19	$ 0.47	$ 1.42	$ 1.14
Total Diluted Earnings per Common Share	$ 0.88	$ 1.13	$ 3.42	$ 3.07