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Long-Term Obligations and Other Short-Term Borrowings Long-Term Debt (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Debt Instrument [Line Items]        
Accounts payable $ 23,700 $ 23,700 $ 21,374  
Offer as percentage of principal amount   101.00%    
Gain (Loss) on Extinguishment of Debt   $ (14) (16) $ 0
Notes Payable Repurchased       100
1.948% Notes due 2019        
Debt Instrument [Line Items]        
Notes Payable Repurchased       1,000
2.616% Notes due fiscal 2022        
Debt Instrument [Line Items]        
Notes Payable Repurchased $ 262 2 247 67
3.41% Notes due fiscal 2027        
Debt Instrument [Line Items]        
Notes Payable Repurchased     104 24
4.368% Notes due fiscal 2047        
Debt Instrument [Line Items]        
Notes Payable Repurchased     35  
2.616% Notes, 3.2% Notes, 3.41% Notes, 4.6% Notes, 4.9% Notes and 4.368% Notes [Member]        
Debt Instrument [Line Items]        
Gain (Loss) on Extinguishment of Debt     9  
Floating Rate Notes due fiscal 2022        
Debt Instrument [Line Items]        
Notes Payable Repurchased   40 20 8
2.4% Notes due 2019        
Debt Instrument [Line Items]        
Notes Payable Repurchased     450  
3.2% Notes due 2022        
Debt Instrument [Line Items]        
Notes Payable Repurchased   $ 238 11 $ 1
4.6% Notes due 2043        
Debt Instrument [Line Items]        
Notes Payable Repurchased     6  
4.625% Notes due 2020        
Debt Instrument [Line Items]        
Gain (Loss) on Extinguishment of Debt     7  
Notes Payable Repurchased     500  
4.9% Notes due 2045        
Debt Instrument [Line Items]        
Notes Payable Repurchased     $ 5  
7.0% Debentures due 2026 | Allegiance Corporation        
Debt Instrument [Line Items]        
Stated interest rate 7.00% 7.00%