CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Net sales and operating revenues	$ 4,504		$ 2,533	$ 8,988	$ 5,114
Costs and expenses
Cost of sales	3,793		2,134	7,657	4,327
Selling, general, and administrative	288		154	604	305
Depreciation and amortization	169		60	338	120
Engineering, research, and development	78		39	170	79
Restructuring charges and asset impairments	61		29	85	41
Goodwill impairment charge	0	$ 60	0	60	0
Costs and expenses	4,389		2,416	8,914	4,872
Other expense (income)
Non-service pension and other postretirement benefit costs (credits)	4		3	6	6
Equity in (earnings) losses of nonconsolidated affiliates, net of tax	(17)		0	(33)	0
Other expense (income), net	(13)		3	(16)	3
Total other expense (income)	(26)		6	(43)	9
Earnings (loss) before interest expense, income taxes, and noncontrolling interests	141		111	117	233
Interest expense	82		22	163	45
Earnings (loss) before income taxes and noncontrolling interests	59		89	(46)	188
Income tax expense (benefit)	14		26	14	51
Net income (loss)	45		63	(60)	137
Less: Net income (loss) attributable to noncontrolling interests	19		16	31	30
Net income (loss) attributable to Tenneco Inc.	$ 26		$ 47	$ (91)	$ 107
Basic earnings (loss) per share:
Earnings (loss) per share (in dollars per share)	$ 0.32		$ 0.92	$ (1.13)	$ 2.08
Weighted average shares outstanding (in shares)	80,920,825		51,258,668	80,897,731	51,232,639
Diluted earnings (loss) per share:
Earnings (loss) per share (in dollars per share)	$ 0.32		$ 0.92	$ (1.13)	$ 2.07
Weighted average shares outstanding (in shares)	80,920,825		51,607,224	80,897,731	51,546,015