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Segments of Business - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2017 USD ($) segment | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 2 |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of business |  |  |  |  |  |  |  |  | $ (94) | $ 103 | $ 0
Goodwill impairment charge |  |  |  |  |  |  |  |  | 290 | 0 | $ 0
Pre-tax charge |  |  |  |  | $ 229 |  |  |  | 14 | 229 |
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  | 17 |  |  |  | 5 | $ 17 |
Distribution Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  | $ 0 |  |
Distribution Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of total revenue (less than) (as a percent) |  |  |  |  |  |  |  |  | 2.00% | 2.00% | 2.00%
Net cash proceeds |  | $ 2 |  | $ 142 |  | $ 17 |  | $ 59 | $ 144 | $ 76 |
Pre-tax charge |  |  |  |  | 161 |  |  |  | 19 | 161 |
Distribution Solutions | Operating Segments | ZEE Medical Business |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of business |  |  |  |  |  |  | $ 52 |  |  | 52 |
Technology Solutions |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  | 290 |  |
Technology Solutions | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  | $ 290 |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  | 51 |  |  |  | (10) | 51 |
Technology Solutions | Operating Segments | Core MTS Businesses |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of business | $ 3,947 |  |  |  |  |  |  |  | $ 3,947 |  |
Technology Solutions | Operating Segments | Nurse Triage |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale of business |  |  |  |  |  |  |  | $ 51 |  | $ 51 |
Cost Alignment Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pre-tax charge |  |  |  |  | $ 229 |  |  |  |  |  |

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