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Business Combinations - Narrative (Details)
kr in Millions, $ in Millions
3 Months Ended 12 Months Ended
Jul. 01, 2020
USD ($)
business_unit
software_engineer
Mar. 31, 2020
USD ($)
Mar. 31, 2020
SEK (kr)
Dec. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
Mar. 31, 2021
Apr. 02, 2020
Business Acquisition [Line Items]              
Goodwill       $ 317 $ 317    
Zenuity, Inc              
Business Acquisition [Line Items]              
Goodwill $ 25            
Business combination, acquisition related costs       $ 1      
Zenuity AB              
Business Acquisition [Line Items]              
Ownership percentage in joint venture 50.00% 50.00% 50.00%     50.00% 50.00%
Cash contribution to joint venture   $ 16 kr 150        
Zenuity AB | Zenuity, Inc              
Business Acquisition [Line Items]              
Cash contribution to joint venture $ 37            
Number of software engineers | software_engineer 200            
Number of business units | business_unit 2