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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Summary of Earnings Per Share of Common Stock
Earnings per share of common stock outstanding were computed as follows:
 
Year Ended December 31
 
2018
 
2017
 
2016
 
(Millions Except Share and Per Share Amounts)
Net income attributable to Tenneco Inc.
$
55

 
$
198

 
$
347

Basic earnings per share —
 
 
 
 
 
Average shares of common stock outstanding
58,625,087

 
52,796,184

 
55,939,135

Earnings per average share of common stock
$
0.93

 
$
3.75

 
$
6.20

Diluted earnings per share —
 
 
 
 
 
Average shares of common stock outstanding
58,625,087

 
52,796,184

 
55,939,135

Effect of dilutive securities:

 

 

Restricted stock and RSUs
93,546

 
111,062

 
175,513

Stock options
40,099

 
119,665

 
292,788

Average shares of common stock outstanding including dilutive securities
58,758,732

 
53,026,911

 
56,407,436

Earnings per average share of common stock
$
0.93

 
$
3.73

 
$
6.15