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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following is a reconciliation of DTE Energy's basic and diluted income per share calculation:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
(In millions, except per share amounts)
Basic Earnings per Share
 
 
 
 
 
 
 
Net Income Attributable to DTE Energy Company
$
177

 
$
152

 
$
577

 
$
399

Less: Allocation of earnings to net restricted stock awards
—

 
—

 
1

 
1

Net income available to common shareholders — basic
$
177

 
$
152

 
$
576

 
$
398

 
 
 
 
 
 
 
 
Average number of common shares outstanding
179

 
179

 
179

 
179

Basic Earnings per Common Share
$
0.99

 
$
0.84

 
$
3.21

 
$
2.22

 
 
 
 
 
 
 
 
Diluted Earnings per Share
 
 
 
 
 
 
 
Net Income Attributable to DTE Energy Company
$
177

 
$
152

 
$
577

 
$
399

Less: Allocation of earnings to net restricted stock awards
—

 
—

 
1

 
1

Net income available to common shareholders — diluted
$
177

 
$
152

 
$
576

 
$
398

 
 
 
 
 
 
 
 
Average number of common shares outstanding
179

 
179

 
179

 
179

Incremental shares attributable to:
 
 
 
 
 
 
 
Average dilutive performance share awards and stock options(a)
—

 
1

 
—

 
1

Average number of common shares outstanding — diluted
179

 
180

 
179

 
180

Diluted Earnings per Common Share
$
0.99

 
$
0.84

 
$
3.21

 
$
2.22

_______________________________________
(a)
The 2016 equity units are potentially dilutive securities but were excluded from the calculation of diluted EPS for the three and six months ended June 30, 2017, as the dilutive stock price threshold was not met.