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Segment Information (Schedule of Segment Information) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
Segment Reporting Information [Line Items] |  |
Segment reporting revenue from external customers | $ 47,546 | $ 43,476
Distribution solutions | 931 | 681
Interest Expense | (89) | (96)
Income from Continuing Operations Before Income Taxes | 855 | 604
Assets, fair value adjustment |  | 34
North America pharmaceutical distribution and services |  |
Segment Reporting Information [Line Items] |  |
Segment reporting revenue from external customers | 39,532 | 34,304
International pharmaceutical distribution and services |  |
Segment Reporting Information [Line Items] |  |
Segment reporting revenue from external customers | 5,838 | 7,025
Medical-Surgical distribution & services |  |
Segment Reporting Information [Line Items] |  |
Segment reporting revenue from external customers | 1,440 | 1,379
Distribution solutions |  |
Segment Reporting Information [Line Items] |  |
Segment reporting revenue from external customers | 46,810 | 42,708
Distribution solutions | 910 | $ 740
Proceeds from legal settlements | $ 59 |
Distribution solutions | Maximum |  |
Segment Reporting Information [Line Items] |  |
Revenue derived from services, percentage | 2.00% | 2.00%
Technology solutions |  |
Segment Reporting Information [Line Items] |  |
Segment reporting revenue from external customers | $ 736 | $ 768
Distribution solutions | 158 | 68
Operating segments |  |
Segment Reporting Information [Line Items] |  |
Distribution solutions | 1,068 | 808
Corporate |  |
Segment Reporting Information [Line Items] |  |
Corporate expenses, net | (124) | (108)
Nurse triage |  |
Segment Reporting Information [Line Items] |  |
Gain (Loss) on disposition of business | 51 |
Nurse triage | Technology solutions |  |
Segment Reporting Information [Line Items] |  |
Gain (Loss) on disposition of business | 51 |
International Technology Workforce [Member] | Cost of Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets, fair value adjustment |  | 34
LIFO method of accounting [Member] | Distribution solutions |  |
Segment Reporting Information [Line Items] |  |
Distribution solutions | $ 91 | $ 98

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