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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Summary of Earnings Per Share of Common Stock
Earnings per share of common stock outstanding were computed as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
 
(Millions Except Share and Per Share Amounts)
Basic earnings (loss) per share —
 
 
 
 
 
 
 
Net income (loss) attributable to Tenneco Inc.
$
50

 
$
(3
)
 
$
108

 
$
56

Weighted Average shares of common stock outstanding
51,258,668

 
53,505,341

 
51,232,639

 
53,662,375

Earnings (loss) per share of common stock
$
0.98

 
$
(0.05
)
 
$
2.12

 
$
1.05

Diluted earnings (loss) per share —
 
 
 
 

 

Net income (loss) attributable to Tenneco Inc.
$
50

 
$
(3
)
 
$
108

 
$
56

Weighted Average shares of common stock outstanding
51,258,668

 
53,505,341

 
51,232,639

 
53,662,375

Effect of dilutive securities:
 
 
 
 

 

Restricted stock
298,826

 
—

 
251,971

 
111,459

Stock options
49,730

 
—

 
61,405

 
179,084

Weighted Average shares of common stock outstanding including dilutive securities
51,607,224

 
53,505,341

 
51,546,015

 
53,952,918

Earnings (loss) per share of common stock
$
0.98

 
$
(0.05
)
 
$
2.10

 
$
1.05