China Variable Interest Entity - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Net Sales		$ 830	$ 781	$ 802	$ 835	$ 799	$ 784	$ 877	$ 915	$ 3,248	$ 3,375	$ 3,096
Cost of goods sold										2,537	2,599	2,361
Selling, general and administrative expenses										249	249	249
Tax expense (benefit) (Note 7)										33	(810)	1,349
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										530	470	393
Cost of goods sold										370	340	310
Selling, general and administrative expenses										14	19	20
Tax expense (benefit) (Note 7)										$ 25	$ 25	$ 28