CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS EQUITY (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Total Tenneco Inc. Shareholders' Equity	Noncontrolling Interests	Total Equity
Balance at beginning of period at Dec. 31, 2018			$ (930)	$ 4,360	$ (1,013)	$ (692)	$ 1,726	$ 190	$ 1,916
Beginning balance (in shares) at Dec. 31, 2018		1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (117)				(117)		(117)	7	(110)
Foreign currency translation adjustments	35					29	29	4	33
Derivatives	4					4	4		4
Defined benefit plans	1					1	1		1
Comprehensive income (loss)	(65)						(83)	11	(72)
Stock-based compensation, net				5			5		5
Cash dividends declared					(20)		(20)		(20)
Purchase accounting measurement period adjustment	(8)							(1)	(1)
Distributions declared to noncontrolling interests	0							(1)	(1)
Ending balance (in shares) at Mar. 31, 2019		1
Balance at end of period at Mar. 31, 2019			(930)	4,365	(1,150)	(658)	1,628	199	1,827
Balance at beginning of period at Dec. 31, 2019	1,619		(930)	4,432	(1,367)	(711)	1,425	194	1,619
Beginning balance (in shares) at Dec. 31, 2019		1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(839)				(839)		(839)	2	(837)
Foreign currency translation adjustments	(219)					(199)	(199)	(13)	(212)
Derivatives	(2)					(2)	(2)		(2)
Defined benefit plans	4					4	4		4
Comprehensive income (loss)	(1,043)						(1,036)	(11)	(1,047)
Stock-based compensation, net				2			2		2
Purchase accounting measurement period adjustment	0
Reclassification of redeemable noncontrolling interest to permanent equity								82	82
Redeemable noncontrolling interest transaction with owner				(7)			(7)		(7)
Distributions declared to noncontrolling interests	(82)
Ending balance (in shares) at Mar. 31, 2020		1
Balance at end of period at Mar. 31, 2020	$ 649		$ (930)	$ 4,427	$ (2,206)	$ (908)	$ 384	$ 265	$ 649