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Long-Term Obligations and Other Short-Term Borrowings Long-Term Debt (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2018
Jul. 31, 2017
Jun. 30, 2019
Debt Instrument [Line Items]      
Accounts payable $ 19,677   $ 21,535
1.7% Notes due 2018      
Debt Instrument [Line Items]      
Proceeds from (Repayments of) Notes Payable   $ (400)  
Offer as percentage of principal amount     101.00%
1.95% Notes due 2018      
Debt Instrument [Line Items]      
Proceeds from (Repayments of) Notes Payable $ (550)    
7.0% Debentures due 2026 | Allegiance Corporation      
Debt Instrument [Line Items]      
Stated interest rate     7.00%