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Long-Term Obligations and Other Short-Term Borrowings (Details) - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Debt and Capital Lease Obligations | $ 10,395 | $ 9,759
Accounts payable | 17,906 | 19,194
1.7% Notes due fiscal 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Repayments of Debt | 400 |
Patient Recovery Business |  |
Debt Instrument [Line Items] |  |
Proceeds from Notes Payable | $ 5,200 |
Short Term Credit Facilities Member | Committed Receivables Sales Facility Program [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 1,000
Commercial Paper [Member] | Committed Receivables Sales Facility Program [Member] |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Fair Value of Amount Outstanding |  | 151
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

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