Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

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

	2012		2011		2010
	(In millions, expect per share amounts)
Basic Earnings per Share
Net income attributable to DTE Energy Company	$	610	$	711	$	630
Average number of common shares outstanding	171		169		168
Weighted average net restricted shares outstanding	1		1		1
Dividends declared — common shares	$	413	$	392	$	365
Dividends declared — net restricted shares	1		1		2
Total distributed earnings	$	414	$	393	$	367
Net income less distributed earnings	$	196	$	318	$	263
Distributed (dividends per common share)	$	2.42	$	2.32	$	2.18
Undistributed	1.14		1.87		1.57
Total Basic Earnings per Common Share	$	3.56	$	4.19	$	3.75
Diluted Earnings per Share
Net income attributable to DTE Energy Company	$	610	$	711	$	630
Average number of common shares outstanding	171		169		168
Average incremental shares from assumed exercise of options	1		1		1
Common shares for dilutive calculation	172		170		169
Weighted average net restricted shares outstanding	1		1		1
Dividends declared — common shares	$	413	$	392	$	365
Dividends declared — net restricted shares	1		1		2
Total distributed earnings	$	414	$	393	$	367
Net income less distributed earnings	$	196	$	318	$	263
Distributed (dividends per common share)	$	2.42	$	2.32	$	2.18
Undistributed	1.13		1.86		1.56
Total Diluted Earnings per Common Share	$	3.55	$	4.18	$	3.74