Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2011

Earnings Per Share [Abstract]

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

	2011		2010		2009
	(In millions, expect per share amounts)
Basic Earnings per Share
Net income attributable to DTE Energy Company	$	711	$	630	$	532
Average number of common shares outstanding	169		168		164
Weighted average net restricted shares outstanding	1		1		1
Dividends declared — common shares	$	392	$	365	$	347
Dividends declared — net restricted shares	1		2		2
Total distributed earnings	$	393	$	367	$	349
Net income less distributed earnings	$	318	$	263	$	183
Distributed (dividends per common share)	$	2.32	$	2.18	$	2.12
Undistributed	1.87		1.57		1.12
Total Basic Earnings per Common Share	$	4.19	$	3.75	$	3.24
Diluted Earnings per Share
Net income attributable to DTE Energy Company	$	711	$	630	$	532
Average number of common shares outstanding	169		168		164
Average incremental shares from assumed exercise of options	1		1		—
Common shares for dilutive calculation	170		169		164
Weighted average net restricted shares outstanding	1		1		1
Dividends declared — common shares	$	392	$	365	$	347
Dividends declared — net restricted shares	1		2		2
Total distributed earnings	$	393	$	367	$	349
Net income less distributed earnings	$	318	$	263	$	183
Distributed (dividends per common share)	$	2.32	$	2.18	$	2.12
Undistributed	1.86		1.56		1.12
Total Diluted Earnings per Common Share	$	4.18	$	3.74	$	3.24