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Equity and Noncontrolling Interests - Changes in Redeemable Noncontrolling Interests (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2018
Mar. 31, 2017
Parent          
Stockholders' Equity Attributable to Redeemable Noncontrolling Interest [Roll Forward]          
Spin-off of Adient $ 0 $ 18 $ 4,020 $ 0 $ (4,038)
Redeemable Noncontrolling Interests [Member]          
Stockholders' Equity Attributable to Redeemable Noncontrolling Interest [Roll Forward]          
Beginning balance 226 159 234 211 234
Net income 12 8   25 21
Foreign currency translation adjustments 5 1   10 (8)
Realized and unrealized losses on derivatives (5) 0   (8) 0
Dividends (3) 0   (3) (43)
Spin-off of Adient       0 (36)
Ending balance $ 235 $ 168 $ 159 $ 235 $ 168