Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2012

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended				Nine Months Ended
	September 30				September 30
	2012		2011		2012		2011
Basic Earnings per Share
Net income attributable to DTE Energy Company	$	227	$	183	$	529	$	561
Average number of common shares outstanding	172		169		171		169
Weighted average net restricted shares outstanding	1		1		1		1
Dividends declared — common shares	$	106	$	99	$	307	$	293
Dividends declared — net restricted shares	1		—		2		1
Total distributed earnings	$	107	$	99	$	309	$	294
Net income less distributed earnings	$	120	$	84	$	220	$	267
Distributed (dividends per common share)	$	0.62	$	0.59	$	1.80	$	1.74
Undistributed	0.70		0.49		1.29		1.57
Total Basic Earnings per Common Share	$	1.32	$	1.08	$	3.09	$	3.31
Diluted Earnings per Share
Net income attributable to DTE Energy Company	$	227	$	183	$	529	$	561
Average number of common shares outstanding	172		169		171		169
Average incremental shares from assumed exercise of options	—		1		—		1
Common shares for dilutive calculation	172		170		171		170
Weighted average net restricted shares outstanding	1		1		1		1
Dividends declared — common shares	$	106	$	99	$	307	$	293
Dividends declared — net restricted shares	1		—		2		1
Total distributed earnings	$	107	$	99	$	309	$	294
Net income less distributed earnings	$	120	$	84	$	220	$	267
Distributed (dividends per common share)	$	0.62	$	0.59	$	1.80	$	1.74
Undistributed	0.69		0.48		1.28		1.56
Total Diluted Earnings per Common Share	$	1.31	$	1.07	$	3.08	$	3.30