Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2011

Earnings Per Share, Basic and Diluted [Abstract]

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

	Three Months				Nine Months
	Ended September 30				Ended September 30
(in Millions, except per share amounts)	2011		2010		2011		2010
Basic Earnings per Share
Net income attributable to DTE Energy Company	$	183	$	163	$	561	$	478
Average number of common shares outstanding	169		169		169		168
Weighted average net restricted shares outstanding	1		1		1		1
Dividends declared — common shares	$	99	$	94	$	293	$	271
Dividends declared — net restricted shares	—		1		1		1
Total distributed earnings	$	99	$	95	$	294	$	272
Net income less distributed earnings	$	84	$	68	$	267	$	206
Distributed (dividends per common share)	0.59		0.56		$	1.74	$	1.62
Undistributed	0.49		0.41		1.57		1.23
Total Basic Earnings per Common Share	$	1.08	0.97		$	3.31	$	2.85
Diluted Earnings per Share
Net income attributable to DTE Energy Company	$	183	$	163	$	561	$	478
Average number of common shares outstanding	169		169		169		168
Average incremental shares from assumed exercise of options	1		1		1		—
Common shares for dilutive calculation	170		170		170		168
Weighted average net restricted shares outstanding	1		1		1		1
Dividends declared — common shares	$	99	$	94	$	293	$	271
Dividends declared — net restricted shares	—		1		1		1
Total distributed earnings	$	99	$	95	$	294	$	272
Net income less distributed earnings	$	84	$	68	$	267	$	206
Distributed (dividends per common share)	$	0.59	$	0.56	$	1.74	$	1.62
Undistributed	0.48		0.40		1.56		1.22
Total Diluted Earnings per Common Share	$	1.07	$	0.96	$	3.30	$	2.84