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Quarterly Financial Information (Unaudited) - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pretax charges (credits) related to last-in-first-out method of accounting for inventory |  |  |  |  |  |  |  |  | $ (7) | $ 244 | $ 337
Pre-tax gain on sale of business |  |  |  |  |  |  |  |  | (94) | 103 | 0
Goodwill impairment charge |  |  |  |  |  |  |  |  | 290 | 0 | $ 0
Pre-tax charge |  |  |  |  | $ 229 |  |  |  | 14 | 229 |
Cost of Sales |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  | 26 |  |  |  |  | 26 |
Operating Expenses |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  | 203 |  |  |  |  | 203 |
Distribution Solutions |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  | 0 |  |
Technology Solutions |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  | 290 |  |
Operating Segments | Distribution Solutions |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pretax charges (credits) related to last-in-first-out method of accounting for inventory | $ 144 | $ (155) | $ (43) | $ 47 | 29 | $ 33 | $ 91 | $ 91 |  |  |
Net cash proceeds |  | $ 2 |  | $ 142 |  | $ 17 |  | 59 | 144 | 76 |
Pre-tax charge |  |  |  |  | 161 |  |  |  | 19 | 161 |
Operating Segments | Distribution Solutions | ZEE Medical Business |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of business |  |  |  |  |  |  | 52 |  |  | 52 |
Gain from sale of business, after tax |  |  |  |  |  |  | $ 29 |  |  |  |
Operating Segments | Distribution Solutions | Cost of Sales |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  |  |  |  |  |  | 5 |
Operating Segments | Distribution Solutions | Operating Expenses |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  |  |  |  |  |  | 156 |
Operating Segments | Technology Solutions |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  | $ 290 |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  | $ 51 |  |  |  | (10) | 51 |
Operating Segments | Technology Solutions | Core MTS Businesses |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of business | 3,947 |  |  |  |  |  |  |  | $ 3,947 |  |
Gain from sale of business, after tax | $ 3,018 |  |  |  |  |  |  |  |  |  |
Operating Segments | Technology Solutions | Nurse Triage |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of business |  |  |  |  |  |  |  | 51 |  | 51 |
Gain from sale of business, after tax |  |  |  |  |  |  |  | $ 38 |  |  |
Operating Segments | Technology Solutions | Cost of Sales |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  |  |  |  |  |  | 21 |
Operating Segments | Technology Solutions | Operating Expenses |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  |  |  |  |  |  | $ 30 |

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