China Variable Interest Entity - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Variable Interest Entity [Line Items]
Net sales		$ 781	$ 784	$ 2,418	$ 2,576
Cost of goods sold		609	606	1,868	1,972
Selling, general and administrative expenses		68	60	186	186
Income tax expense		34	(856)	79	(844)
Garrett China | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest ownership percentage	100.00%
Equity interests in exchange for shares of common stock issued	8,444,077
Net sales		123	105	352	361
Cost of goods sold		88	82	240	264
Selling, general and administrative expenses		2	5	8	15
Income tax expense		$ 6	$ 6	$ 20	$ 20