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Equity and Noncontrolling Interests - Changes in AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 2,189 $ 2,717 $ 4,592
Aggregate adjustment for the period, net of tax (89) (38) (126)
Realized and unrealized gains (losses) on derivatives (20) (1) (10)
Net reclassifications to AOCI 0 2 (1)
Ending balance 1,535 2,189 2,717
Foreign currency translation adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (558) (523) (398)
Aggregate adjustment for the period, net of tax (76) (35) (125)
Ending balance (634) (558) (523)
Realized and unrealized gains (losses) on derivatives      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (8) (7) 3
Realized and unrealized gains (losses) on derivatives (34) (5) (13)
Reclassification to income, net of tax 14 4 3
Ending balance (28) (8) (7)
Pension plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (3) (1) (2)
Net reclassifications to AOCI 0 (2) 1
Ending balance (3) (3) (1)
AOCI attributable to parent      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (569) (531) (397)
Realized and unrealized gains (losses) on derivatives (20) (1) (10)
Net reclassifications to AOCI   2  
Ending balance $ (665) $ (569) $ (531)