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Long-Term Obligations and Other Short-Term Borrowings Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Jun. 30, 2018
--- | --- | ---
Debt Disclosure [Abstract] |  |
Debt and Capital Lease Obligations | $ 9,001 | $ 9,013
Accounts payable | 20,236 | $ 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 |

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