CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues
Net sales and operating revenues	$ 4,583	$ 2,637	$ 9,314	$ 6,473
Costs and expenses
Cost of sales (exclusive of depreciation and amortization)	3,973	2,498	8,034	5,837
Selling, general, and administrative	269	195	524	444
Depreciation and amortization	145	159	300	330
Engineering, research, and development	73	55	145	132
Restructuring charges, net and asset impairments	27	121	52	605
Goodwill and intangible impairment charges	0	0	0	383
Costs and expenses	4,487	3,028	9,055	7,731
Other income (expense)
Non-service pension and postretirement benefit (costs) credits	3	1	6	2
Equity in earnings (losses) of nonconsolidated affiliates, net of tax	15	4	37	17
Gain (loss) on extinguishment of debt	0	0	8	0
Other income (expense), net	13	11	21	19
Total other expense (income)	31	16	72	38
Earnings (loss) before interest expense, income taxes, and noncontrolling interests	127	(375)	331	(1,220)
Interest expense	(69)	(66)	(139)	(141)
Earnings (loss) before income taxes and noncontrolling interests	58	(441)	192	(1,361)
Income tax (expense) benefit	(41)	101	(88)	195
Net income (loss)	17	(340)	104	(1,166)
Less: Net income (loss) attributable to noncontrolling interests	27	10	49	23
Net income (loss) attributable to Tenneco Inc.	$ (10)	$ (350)	$ 55	$ (1,189)
Basic earnings (loss) per share:
Earnings (loss) per share (in dollars per share)	$ (0.12)	$ (4.30)	$ 0.68	$ (14.64)
Weighted average shares outstanding (in shares)	82,251,559	81,350,773	82,102,310	81,259,667
Diluted earnings (loss) per share:
Earnings (loss) per share (in dollars per share)	$ (0.12)	$ (4.30)	$ 0.67	$ (14.64)
Weighted average shares outstanding (in shares)	82,251,559	81,350,773	83,122,354	81,259,667