Earnings (Loss) per Share

12 Months Ended

Dec. 31, 2019

The Company computes basic earnings (loss) per share by dividing income available to common shareholders by the weighted average number of common shares outstanding. The computation of diluted earnings (loss) per share is similar to the computation of basic earnings (loss) per share, except that the Company adjusts the weighted average number of shares outstanding to include estimates of additional shares that would be issued if potentially dilutive common shares had been issued. In addition, the Company adjusts income (loss) available to common shareholders to include any changes in income or loss that would result from the assumed issuance of the dilutive common shares.

Earnings (loss) per share of common stock outstanding were computed as follows:



	Year Ended December 31
	2019			2018		2017
Net income (loss) attributable to Tenneco Inc.	$	(334	)	$	55	$	198
Basic earnings (loss) per share —
Average shares of common stock outstanding	80,904,060			58,625,087		52,796,184
Earnings (loss) per average share of common stock	$	(4.12	)	$	0.93	$	3.75
Diluted earnings (loss) per share —
Average shares of common stock outstanding	80,904,060			58,625,087		52,796,184
Effect of dilutive securities:
Restricted stock and RSUs	—			93,546		111,062
Stock options	—			40,099		119,665
Average shares of common stock outstanding including dilutive securities	80,904,060			58,758,732		53,026,911
Earnings (loss) per average share of common stock	$	(4.12	)	$	0.93	$	3.73

For the years ended December 31, 2019, 2018, and 2017, the weighted average number of anti-dilutive potential common shares excluded from the calculation above totaled 1,868,274 shares, 257,567 shares, and 834 shares.