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Long-Term Obligations and Other Short-Term Borrowings (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Jun. 30, 2017 | Sep. 30, 2017
Debt Disclosure [Abstract] |  |
Debt and Capital Lease Obligations | $ 10,395 | $ 10,003
Accounts payable | $ 17,906 | 19,202
1.7% Notes due fiscal 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Notes Payable |  | 400
Debt Instrument, Interest Rate, Stated Percentage | 1.70% |
1.948% Notes due 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 1.948% |
2.616% Notes due fiscal 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.616% |
3.079% Notes due fiscal 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.079% |
3.41% Notes due fiscal 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.41% |
4.368% Notes due fiscal 2047 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.368% |
Patient Recovery Business [Member] |  |
Debt Instrument [Line Items] |  |
Proceeds from Notes Payable | $ 5,200 |
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 2,000
Revolving Credit Facility [Member] | Committed Receivables Sales Facility Program [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 0
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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