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Summary of Significant Accounting Policies - Narrative (Details)			3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Feb. 03, 2020	Jun. 14, 2019	Jan. 01, 2019 USD ($)	Jun. 29, 2018 USD ($)
Product Information [Line Items]
Impairment losses recognized related to contract assets					$ 0	$ 0	$ 0
Number of operating segments \| segment					2
Production parts average payment terms					30 days
Capitalized contract costs	$ 12,000,000	$ 12,000,000			$ 12,000,000	12,000,000
Cash and cash equivalents	859,000,000	864,000,000			859,000,000	864,000,000					$ 1,000,000,000
Goodwill impairment charge					0	0	234,000,000
Goodwill	290,000,000	291,000,000			290,000,000	291,000,000
Total lease liabilities	101,000,000				101,000,000					$ 75,000,000
Net transaction gains/(loss)					2,000,000	(2,000,000)	3,000,000
Operating lease right-of-use assets	100,000,000				100,000,000					$ 75,000,000
Proceeds from collection of long-term loans to related parties				$ 20,000,000
Contract with customer, asset, net, current	81,000,000	62,000,000			81,000,000	62,000,000
Contract with customer, asset, net, noncurrent	$ 81,000,000	$ 62,000,000			81,000,000	62,000,000
Research And Development, Reimbursements From Customers					103,000,000	$ 95,000,000	$ 72,000,000
VNBS \| Subsequent Event
Product Information [Line Items]
Ownership percentage in joint venture								51.00%
Veoneer Nissin Brakes Systems
Product Information [Line Items]
Minority ownership percentage									49.00%
Brake Systems Segment
Product Information [Line Items]
Goodwill impairment charge			$ 234,000,000		$ 0
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
Sales Revenue \| Customer Concentration Risk
Product Information [Line Items]
Concentration risk, percentage					10.00%
Four Largest Customers \| Sales Revenue \| Customer Concentration Risk
Product Information [Line Items]
Concentration risk, percentage					59.00%	58.00%	62.00%
Four Largest Customers \| Accounts Receivable \| Customer Concentration Risk
Product Information [Line Items]
Concentration risk, percentage	39.00%	52.00%