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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%

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