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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net earnings (loss) attributable to BorgWarner Inc.  $ 247 $ (98) $ 312 $ 31
Other comprehensive income (loss)        
Foreign currency translation adjustments [1] 57 14 (30) (60)
Hedge instruments [1] 4 1 (2) (1)
Defined benefit postretirement plans [1] 2 (1) 10 1
Total other comprehensive income (loss) attributable to BorgWarner Inc. 63 14 (22) (60)
Comprehensive (loss) income attributable to BorgWarner Inc. [1] 310 (84) 290 (29)
Net earnings attributable to noncontrolling interest, net of tax 27 14 56 22
Other comprehensive loss attributable to the noncontrolling interest [1] 0 0 (5) (3)
Comprehensive income (loss) $ 337 $ (70) $ 341 $ (10)
[1] Net of income taxes.