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Summary of Significant Accounting Policies - Narrative (Details)			3 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 29, 2018 USD ($)	Dec. 31, 2015 USD ($)
Product Information [Line Items]
Capitalized contract costs	$ 54,000,000	$ 23,000,000	$ 23,000,000	$ 54,000,000	$ 23,000,000
Impairment losses recognized related to contract assets				$ 0	0
Number of operating segments \| segment				2
Production parts average payment terms				30 days
Cash and cash equivalents	864,000,000	0	0	$ 864,000,000	0	$ 0	$ 1,000,000,000	$ 0
Short-term investments	5,000,000	0	0	5,000,000	0
Capitalized amount	48,000,000			48,000,000
Goodwill, impairment charge				0	234,000,000	0
Goodwill	291,000,000	292,000,000	292,000,000	291,000,000	292,000,000	490,000,000
Net transaction gains/(loss)				(2,000,000)	3,000,000	1,000,000
Brake Systems
Product Information [Line Items]
Goodwill, impairment charge			234,000,000		234,000,000
Goodwill	$ 0	$ 0	$ 0	$ 0	$ 0	$ 212,000,000
Minimum
Product Information [Line Items]
Finite-lived intangible asset, useful life				5 years
Maximum
Product Information [Line Items]
Finite-lived intangible asset, useful life				10 years
Four Largest Customers \| Sales Revenue \| Customer Concentration Risk
Product Information [Line Items]
Concentration risk, percentage				58.00%	62.00%	59.00%
Four Largest Customers \| Accounts Receivable \| Customer Concentration Risk
Product Information [Line Items]
Concentration risk, percentage	52.00%	55.00%