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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Comprehensive Income [Abstract]    
Net earnings attributable to BorgWarner Inc.  $ 65 $ 129
Other comprehensive income (loss)    
Foreign currency translation adjustments [1] (87) (74)
Hedge instruments [1] (6) (2)
Defined benefit postretirement plans [1] 8 2
Total other comprehensive loss attributable to BorgWarner Inc. (85) (74)
Comprehensive (loss) income attributable to BorgWarner Inc. [1] (20) 55
Net earnings attributable to noncontrolling interest, net of tax 29 8
Other comprehensive loss attributable to the noncontrolling interest [1] (5) (3)
Comprehensive income $ 4 $ 60
[1] Net of income taxes.