CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues
Net sales and operating revenues	$ 4,319			$ 2,371	$ 13,307	$ 7,485
Costs and expenses
Cost of sales	3,653			2,002	11,310	6,329
Selling, general, and administrative	249			138	853	443
Depreciation and amortization	165			60	503	180
Engineering, research, and development	78			39	248	118
Restructuring charges, asset impairments, and other	43			16	128	57
Goodwill impairment charge	9	$ 0	$ 60	0	69	0
Costs and expenses	4,197			2,255	13,111	7,127
Other expense (income)
Non-service pension and other postretirement benefit costs (credits)	2			4	8	10
Equity in (earnings) losses of nonconsolidated affiliates, net of tax	(1)			0	(34)	0
Other expense (income), net	(27)			0	(43)	3
Total other expense (income)	(26)			4	(69)	13
Earnings (loss) before interest expense, income taxes, and noncontrolling interests	148			112	265	345
Interest expense	79			24	242	69
Earnings (loss) before income taxes and noncontrolling interests	69			88	23	276
Income tax expense (benefit)	(9)			22	5	73
Net income (loss)	78			66	18	203
Less: Net income (loss) attributable to noncontrolling interests	8			9	39	39
Net income (loss) attributable to Tenneco Inc.	$ 70			$ 57	$ (21)	$ 164
Basic earnings (loss) per share:
Earnings (loss) per share (in dollars per share)	$ 0.87			$ 1.11	$ (0.25)	$ 3.20
Weighted average shares outstanding (in shares)	80,916,676			51,272,618	80,903,967	51,247,664
Diluted earnings (loss) per share:
Earnings (loss) per share (in dollars per share)	$ 0.87			$ 1.11	$ (0.25)	$ 3.20
Weighted average shares outstanding (in shares)	80,916,676			51,401,829	80,903,967	51,395,927