CONDENSED CONSOLIDATED STATEMENT OF EQUITY (DEFICIT) (Unaudited) (USD $)
In Millions, unless otherwise specified
Total
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Treasury Stock
Accumulated Other Comprehensive Loss
Total Deficit Attributable to Meritor, Inc.
Noncontrolling Interests
Beginning balance at Sep. 30, 2013 $ (822) $ 97 $ 914 $ (1,127) $ 0 $ (734) $ (850) $ 28
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Comprehensive income (loss) 38     12   22 34 4
Equity based compensation expense 3   3       3  
Noncontrolling interest dividends (1)             (1)
Ending Balance at Mar. 31, 2014 (782) 97 917 (1,115) 0 (712) (813) 31
Beginning balance at Sep. 30, 2014 (585) 97 918 (878) 0 (749) (612) 27
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Comprehensive income (loss) 28     72   (44) 28 0
Equity based compensation expense 5   5       5  
Vesting of restricted stock 0 2 (2)          
Repurchase of convertible notes (2)   (2)       (2)  
Repurchase of common stock (16)       (16)   (16)  
Noncontrolling interest dividends (1)             (1)
Other equity adjustments 1   1       1  
Ending Balance at Mar. 31, 2015 $ (570) $ 99 $ 920 $ (806) $ (16) $ (793) $ (596) $ 26