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Long-Term Obligations and Other Short-Term Borrowings (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jun. 30, 2018
Debt Instrument [Line Items]    
Carrying amount $ 9,080 $ 9,013
Accounts payable 20,517 $ 19,677
Commercial Paper [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 2,000  
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 2,000  
Short Term Credit Facilities Member | Committed Receivables Sales Facility Program [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 1,000