CONDENSED CONSOLIDATED STATEMENTS OF INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues
Net sales and operating revenues	$ 4,256	$ 4,319	$ 10,729	$ 13,307
Costs and expenses
Cost of sales (exclusive of depreciation and amortization)	3,610	3,660	9,447	11,331
Selling, general, and administrative	214	252	658	862
Depreciation and amortization	151	165	481	503
Engineering, research, and development	67	78	199	248
Restructuring charges, net and asset impairments	17	33	622	98
Goodwill and intangible impairment charges	0	9	383	69
Costs and expenses	4,059	4,197	11,790	13,111
Other income (expense)
Non-service pension and other postretirement benefit (costs) credits	18	(2)	20	(8)
Equity in earnings (losses) of nonconsolidated affiliates, net of tax	9	1	26	34
Other income (expense), net	12	27	31	43
Total other expense (income)	39	26	77	69
Earnings (loss) before interest expense, income taxes, and noncontrolling interests	236	148	(984)	265
Interest expense	(68)	(79)	(209)	(242)
Earnings (loss) before income taxes and noncontrolling interests	168	69	(1,193)	23
Income tax (expense) benefit	(648)	9	(453)	(5)
Net income (loss)	(480)	78	(1,646)	18
Less: Net income (loss) attributable to noncontrolling interests	19	8	42	39
Net income (loss) attributable to Tenneco Inc.	$ (499)	$ 70	$ (1,688)	$ (21)
Basic earnings (loss) per share:
Earnings (loss) per share (in dollars per share)	$ (6.12)	$ 0.87	$ (20.75)	$ (0.25)
Weighted average shares outstanding (in shares)	81,456,821	80,916,676	81,325,385	80,903,967
Diluted earnings (loss) per share:
Earnings (loss) per share (in dollars per share)	$ (6.12)	$ 0.87	$ (20.75)	$ (0.25)
Weighted average shares outstanding (in shares)	81,456,821	80,916,676	81,325,385	80,903,967