Earnings Per Share (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
Basic Earnings per Share
Net Income Attributable to DTE Energy Company	$ 124	$ 198	$ 105	$ 234	$ 81	$ 227	$ 146	$ 156	$ 661	$ 610	$ 711
Average number of common shares outstanding									175	171	169
Weighted average net restricted shares outstanding									1	1	1
Dividends declared, Common Stock									453	413	392
Dividends declared, Net restricted shares									1	1	1
Total distributed earnings									454	414	393
Net income less distributed earnings, Basic									207	196	318
Distributed (dividends per common share)									$ 2.59	$ 2.42	$ 2.32
Undistributed									$ 1.17	$ 1.14	$ 1.87
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
Diluted Earnings per Share
Net Income Attributable to DTE Energy Company	124	198	105	234	81	227	146	156	661	610	711
Common shares for dilutive calculation									175	171	169
Average incremental shares from assumed exercise of options									0	1	1
Weighted Average Number Common shares for dilutive calculation									175	172	170
Weighted average net restricted shares outstanding									1	1	1
Dividends declared, Common Stock									453	413	392
Dividends declared, Net restricted shares									1	1	1
Total distributed earnings									454	414	393
Undistributed									$ 207	$ 196	$ 318
Distributed (dividends per common share)									$ 2.59	$ 2.42	$ 2.32
Earnings Per Share, Diluted, Undistributed									$ 1.17	$ 1.13	$ 1.86
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