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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
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 for the years ended December 31:
 
2018
 
2017
 
2016
 
(In millions, except per share amounts)
Basic Earnings per Share
 
 
 
 
 
Net Income Attributable to DTE Energy Company
$
1,120

 
$
1,134

 
$
868

Less: Allocation of earnings to net restricted stock awards
(2
)
 
(2
)
 
(2
)
Net income available to common shareholders — basic
$
1,118

 
$
1,132

 
$
866

 
 
 
 
 
 
Average number of common shares outstanding — basic
181

 
179

 
179

Basic Earnings per Common Share
$
6.18

 
$
6.32

 
$
4.84

 
 
 
 
 
 
Diluted Earnings per Share
 
 
 
 
 
Net Income Attributable to DTE Energy Company
$
1,120

 
$
1,134

 
$
868

Less: Allocation of earnings to net restricted stock awards
(2
)
 
(2
)
 
(2
)
Net income available to common shareholders — diluted
$
1,118

 
$
1,132

 
$
866

 
 
 
 
 
 
Average number of common shares outstanding — diluted
181

 
179

 
179

Diluted Earnings per Common Share(a)
$
6.17

 
$
6.32

 
$
4.83

_______________________________________
(a)
The 2016 Equity Units excluded from the calculation of diluted EPS were approximately 6.3 million for the years ended December 31, 2018 and 2017 as the dilutive stock price threshold was not met. For more information, see Note 14 to the Consolidated Financial Statements, "Long-Term Debt."