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Segment Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2016 USD ($) segment | Dec. 31, 2015 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  | 2 |
Revenues |  |  |  |  |  |
Total Revenues | $ 50,130 |  | $ 47,899 |  | $ 149,820 | $ 144,206
Operating profit |  |  |  |  |  |
Total | 831 |  | 920 |  | 2,383 | 2,805
Interest Expense | (74) |  | (87) |  | (231) | (267)
Income from Continuing Operations Before Income Taxes | 780 |  | 846 |  | 2,217 | 2,581
Gain on disposition of business |  |  |  |  | (113) | 103
Goodwill impairment charge | 0 |  | 0 |  | 290 | 0
Total Distribution Solutions |  |  |  |  |  |
Operating profit |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  | 0 |
Technology Solutions |  |  |  |  |  |
Operating profit |  |  |  |  |  |
Goodwill impairment charge |  | $ 290 |  |  | 290 |
Operating Segments |  |  |  |  |  |
Revenues |  |  |  |  |  |
Total Revenues | 50,130 |  | 47,899 |  | 149,820 | 144,206
Operating profit |  |  |  |  |  |
Total | 945 |  | 1,028 |  | 2,718 | 3,168
Operating Segments | Total Distribution Solutions |  |  |  |  |  |
Revenues |  |  |  |  |  |
Total Revenues | 49,436 |  | 47,205 |  | 147,722 | 142,055
Operating profit |  |  |  |  |  |
Total | $ 813 |  | $ 906 |  | $ 2,592 | $ 2,742
Revenue derived from services, percentage (less than) | 2.00% |  | 2.00% |  | 2.00% | 2.00%
Proceeds from legal settlements |  |  |  |  | $ 142 | $ 76
Operating Segments | Total Distribution Solutions | ZEE Medical Business |  |  |  |  |  |
Operating profit |  |  |  |  |  |
Gain on disposition of business |  |  |  |  |  | 52
Operating Segments | Total Distribution Solutions | LIFO Method of Accounting |  |  |  |  |  |
Operating profit |  |  |  |  |  |
Total | $ 155 |  | $ (33) |  | 151 | (215)
Operating Segments | Total Distribution Solutions | Reportable Subsegments | North America pharmaceutical distribution and services |  |  |  |  |  |
Revenues |  |  |  |  |  |
Total Revenues | 41,685 |  | 39,615 |  | 124,271 | 119,750
Operating Segments | Total Distribution Solutions | Reportable Subsegments | International pharmaceutical distribution and services |  |  |  |  |  |
Revenues |  |  |  |  |  |
Total Revenues | 6,193 |  | 6,022 |  | 18,794 | 17,726
Operating Segments | Total Distribution Solutions | Reportable Subsegments | Medical-Surgical distribution and services |  |  |  |  |  |
Revenues |  |  |  |  |  |
Total Revenues | 1,558 |  | 1,568 |  | 4,657 | 4,579
Operating Segments | Technology Solutions |  |  |  |  |  |
Revenues |  |  |  |  |  |
Total Revenues | 694 |  | 694 |  | 2,098 | 2,151
Operating profit |  |  |  |  |  |
Total | 132 |  | 122 |  | 126 | 426
Operating Segments | Technology Solutions | Nurse Triage |  |  |  |  |  |
Operating profit |  |  |  |  |  |
Gain on disposition of business |  |  |  | $ 51 |  | 51
Corporate |  |  |  |  |  |
Operating profit |  |  |  |  |  |
Corporate Expenses, Net | (91) |  | $ (95) |  | (270) | $ (320)
New Company | Operating Expenses | Technology Solutions |  |  |  |  |  |
Operating profit |  |  |  |  |  |
Expenses associated with the formation of the joint venture | $ 31 |  |  |  | $ 58 |

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