Derivative and Financial Instruments (Notional Amounts of Outstanding Derivative Contracts) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Sep. 30, 2018
Interest Rate Contract [Member]
Derivative [Line Items]
Notional amounts of outstanding derivative contracts	$ 750	$ 750
Cross-Currency Swap [Member]
Derivative [Line Items]
Notional amounts of outstanding derivative contracts	357	434
Foreign Currency Contract - Other [Member]
Derivative [Line Items]
Notional amounts of outstanding derivative contracts	1,162	914
Coffee Contracts [Member]
Derivative [Line Items]
Notional amounts of outstanding derivative contracts	2	0
Dairy Contracts [Member]
Derivative [Line Items]
Notional amounts of outstanding derivative contracts	5	16
Diesel and Other Contracts [Member]
Derivative [Line Items]
Notional amounts of outstanding derivative contracts	$ 24	$ 21