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Proposed Healthcare Technology Net Asset Exchange (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2016 | Jun. 30, 2017 | Mar. 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |
Current assets held for sale | $ 2,002 | $ 2,002 |  | $ 635
Current liabilities held for sale | 694 | 694 |  | $ 660
Core MTS Businesses | Held-for-sale, Not Discontinued Operations |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Current assets held for sale | 1,892 | 1,892 |  |
Current liabilities held for sale | 693 | 693 |  |
New Company | Operating Expenses | Technology Solutions |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Expenses associated with the formation of the joint venture | 31 | 58 |  |
New Company | Expected |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Expected ownership interest in the joint venture (percent) |  |  | 70.00% |
New Company |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Debt financing commitments received | 6,100 | 6,100 |  |
Bridge loan | $ 1,200 | $ 1,200 |  |
Change Healthcare | New Company | Expected |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Expected ownership interest in the joint venture (percent) |  |  | 30.00% |

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