CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS EQUITY (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Total Tenneco Inc. Shareholders’ Equity (Deficit)	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Treasury Stock	Noncontrolling Interests	Total Equity
Beginning balance (in shares) at Dec. 31, 2019			1
Balance at beginning of period at Dec. 31, 2019		$ 1,425		$ 4,432	$ (711)	$ (1,367)	$ (930)	$ 194	$ 1,619
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(839)				(839)		2	(837)
Foreign currency translation adjustments		(199)			(199)			(13)	(212)
Defined benefit plans		4			4				4
Cash flow hedges		(2)			(2)				(2)
Comprehensive income (loss)		(1,036)						(11)	(1,047)
Stock-based compensation, net		2		2					2
Reclassification of redeemable noncontrolling interest to permanent equity								82	82
Distributions declared to noncontrolling interests		(7)		(7)					(7)
Ending balance (in shares) at Mar. 31, 2020			1
Balance at end of period at Mar. 31, 2020		384		4,427	(908)	(2,206)	(930)	265	649
Beginning balance (in shares) at Dec. 31, 2019			1
Balance at beginning of period at Dec. 31, 2019		1,425		4,432	(711)	(1,367)	(930)	194	1,619
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (1,166)
Foreign currency translation adjustments	(177)
Defined benefit plans	(1)
Cash flow hedges	2
Comprehensive income (loss)	(1,342)
Distributions declared to noncontrolling interests	(82)
Ending balance (in shares) at Jun. 30, 2020			1
Balance at end of period at Jun. 30, 2020		74		4,433	(874)	(2,556)	(930)	275	349
Beginning balance (in shares) at Mar. 31, 2020			1
Balance at beginning of period at Mar. 31, 2020		384		4,427	(908)	(2,206)	(930)	265	649
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(340)	(350)				(350)		6	(344)
Foreign currency translation adjustments	42	35			35			4	39
Defined benefit plans	(5)	(5)			(5)				(5)
Cash flow hedges	4	4			4				4
Comprehensive income (loss)	(299)	(316)						10	(306)
Stock-based compensation, net		6		6					6
Ending balance (in shares) at Jun. 30, 2020			1
Balance at end of period at Jun. 30, 2020		74		4,433	(874)	(2,556)	(930)	275	349
Beginning balance (in shares) at Dec. 31, 2020			1
Balance at beginning of period at Dec. 31, 2020	181	(119)		4,442	(744)	(2,888)	(930)	300	181
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		65				65		10	75
Foreign currency translation adjustments		(46)			(46)			(3)	(49)
Defined benefit plans		3			3				3
Cash flow hedges		(2)			(2)				(2)
Comprehensive income (loss)		20						7	27
Stock-based compensation, net		3		3					3
Distributions declared to noncontrolling interests								(2)	(2)
Ending balance (in shares) at Mar. 31, 2021			1
Balance at end of period at Mar. 31, 2021		(96)		4,445	(789)	(2,823)	(930)	305	209
Beginning balance (in shares) at Dec. 31, 2020			1
Balance at beginning of period at Dec. 31, 2020	181	(119)		4,442	(744)	(2,888)	(930)	300	181
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	104
Foreign currency translation adjustments	10
Defined benefit plans	6
Cash flow hedges	(3)
Comprehensive income (loss)	117
Distributions declared to noncontrolling interests	0
Ending balance (in shares) at Jun. 30, 2021			1
Balance at end of period at Jun. 30, 2021	272	(42)		4,449	(729)	(2,833)	(930)	314	272
Beginning balance (in shares) at Mar. 31, 2021			1
Balance at beginning of period at Mar. 31, 2021		(96)		4,445	(789)	(2,823)	(930)	305	209
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	17	(10)				(10)		8	(2)
Foreign currency translation adjustments	62	58			58			2	60
Defined benefit plans	3	3			3				3
Cash flow hedges	(1)	(1)			(1)				(1)
Comprehensive income (loss)	81	50						10	60
Stock-based compensation, net		4		4					4
Distributions declared to noncontrolling interests								(1)	(1)
Ending balance (in shares) at Jun. 30, 2021			1
Balance at end of period at Jun. 30, 2021	$ 272	$ (42)		$ 4,449	$ (729)	$ (2,833)	$ (930)	$ 314	$ 272