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Segment Information (Details) $ in Millions | 3 Months Ended
--- | ---
Jun. 30, 2017 USD ($) segment | Mar. 31, 2017 USD ($) | Jun. 30, 2016 USD ($)
Segment Reporting [Abstract] |  |  |
Number of operating segments | segment | 2 |  |
Revenues |  |  |
Total Revenues | $ 51,051 |  | $ 49,733
Operating profit |  |  |
Total | 633 |  | 972
Interest Expense | (68) |  | (79)
Income from Continuing Operations Before Income Taxes | 458 |  | 912
Loss from equity method investment in Change Healthcare | 120 |  | 0
Gain from sale of business, pre-tax | 37 |  | 0
Operating Segments |  |  |
Revenues |  |  |
Total Revenues | 51,051 |  | 49,733
Operating profit |  |  |
Total | 635 |  | 1,096
Operating Segments | Total Distribution Solutions |  |  |
Revenues |  |  |
Total Revenues | 50,931 |  | 49,009
Operating profit |  |  |
Total | $ 713 |  | $ 928
Revenue derived from services, percentage (less than) | 2.00% |  | 2.00%
Proceeds from legal settlements |  |  | $ 142
Operating Segments | Total Distribution Solutions | LIFO Method of Accounting |  |  |
Operating profit |  |  |
Total | $ 26 |  | 47
Operating Segments | Total Distribution Solutions | Reportable Subsegments | North America pharmaceutical distribution and services |  |  |
Revenues |  |  |
Total Revenues | 43,016 |  | 41,211
Operating Segments | Total Distribution Solutions | Reportable Subsegments | International pharmaceutical distribution and services |  |  |
Revenues |  |  |
Total Revenues | 6,382 |  | 6,330
Operating Segments | Total Distribution Solutions | Reportable Subsegments | Medical-Surgical distribution and services |  |  |
Revenues |  |  |
Total Revenues | 1,533 |  | 1,468
Operating Segments | Technology Solutions |  |  |
Revenues |  |  |
Total Revenues | 120 |  | 724
Operating profit |  |  |
Total | (78) |  | 168
Corporate |  |  |
Operating profit |  |  |
Corporate Expenses, Net | (109) |  | (105)
Segment Reconciling Items |  |  |
Operating profit |  |  |
Interest Expense | (68) |  | $ (79)
Joint Venture | Change Healthcare, LLC (“Change Healthcare”) |  |  |
Operating profit |  |  |
Loss from equity method investment in Change Healthcare | 120 |  |
Core MTS Businesses | Change Healthcare, LLC (“Change Healthcare”) | Operating Segments | Technology Solutions |  |  |
Operating profit |  |  |
Gain from sale of business, pre-tax | $ 37 | $ 3,947 |

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