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Short-Term Borrowings and Credit Lines (Detail) - Commercial paper - USD ($)
Aug. 31, 2020
May 31, 2020
Short-term Debt [Line Items]    
Line of credit facility, amount outstanding $ 112,000,000 $ 248,000,000
Weighted average interest rate 1.72% 1.65%
Borrowing capacity $ 4,000,000,000