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Short-term Borrowings and Long-term Debt (Schedule of Maturities of Long-term Debt) (Details) - Long-term Debt [Member]
$ in Millions
Jul. 31, 2022
USD ($)
Debt Instrument [Line Items]  
Long-term Debt, Maturities, Repayments of Principal in Year Two $ 10
Long-term Debt, Maturities, Repayments of Principal in Year Three 1,153
Long-term Debt, Maturities, Repayments of Principal in Year Four 3
Long-term Debt, Maturities, Repayments of Principal in Year Five 0
Long-term Debt, Maturities, Repayments of Principal after Year Five $ 2,863