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Other Assets - Narrative (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Other Assets [Abstract]    
Amount of China bank notes sold $ 82 $ 73
Reimbursement for engineering costs in current year 28  
Reimbursement for engineering costs in following year 18  
Reimbursement for engineering costs expected in year two 15  
Reimbursement for engineering costs expected in year three 8  
Reimbursement for engineering costs expected in year four and beyond $ 2