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Other Expense, Net - Summary of Impairment Charges and Loss on Sale Recorded for Certain Investments (Parenthetical) (Detail) - Dongfeng Getrag Transmission Co. Ltd ["DGT"] [Member] - Disposal Group, Not Discontinued Operations [Member]
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Impairments and loss on sale of equity-accounted investments [Line Items]  
Equity method investment realized gain loss on disposal $ 10
Equity method investment realized gain loss on disposal after tax $ 10
Percentage of equity method investment sold 50.00%