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Derivative Instruments and Hedging Activities - Effects of Derivative Instruments on the Condensed Consolidated Statements of Income and Changes in AOCI (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Derivatives Not Designated as Hedging Instruments    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Income $ 93 $ (42)
Interest rate contracts | Interest expense    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in AOCI 0 8
Loss Reclassified from AOCI into Income (7) (1)
Foreign currency contracts    
Derivative Instruments, Gain (Loss)    
Foreign currency contracts (8) (4)
Foreign currency contracts | Derivatives Not Designated as Hedging Instruments | Other non-operating expense, net    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Income (20) (11)
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Revenues    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Income 3 2
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Cost of sales    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Income 103 (33)
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Operating and administrative expenses    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Income 2 0
Commodity contracts | Derivatives Not Designated as Hedging Instruments | Other operating income, net    
Derivative Instruments, Gain (Loss)    
Gain (Loss) Recognized in Income $ 5 $ 0