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Healthcare Technology Net Asset Exchange (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Mar. 01, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Payments received on Healthcare Technology Net Asset Exchange |  |  |  |  | $ 126 | $ 0 |
Net losses from Change Healthcare | $ 61 |  |  | $ 0 | 181 | $ 0 |
Carrying value of investment | 3,795 |  | $ 4,063 |  | 3,795 |  |
Tax Receivable Agreement (“TRA”) | Change Healthcare, LLC (“Change Healthcare”) |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Noncurrent liability | 136 |  | 136 |  | 136 |  |
Joint Venture | Transition Services Agreements (“TSA”) |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Reimbursements for transition services fees | 10 |  |  |  | 47 |  |
Receivables from joint venture | 58 |  |  |  | 58 |  |
Change Healthcare, LLC (“Change Healthcare”) |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Net Loss |  |  |  |  | (9) |  |
Change Healthcare, LLC (“Change Healthcare”) | Core MTS Businesses | Operating Segments | Technology Solutions |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Gain on Healthcare Technology Net Asset Exchange |  | $ 37 | 3,947 |  |  |  |
Gain from sale of business, after tax |  | $ 22 | $ 3,018 |  |  |  |
Payments received on Healthcare Technology Net Asset Exchange | $ 126 |  |  |  |  |  |
Change Healthcare, LLC (“Change Healthcare”) | Joint Venture |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Net Loss |  |  |  |  | $ (13) |  |
Expected ownership interest in the joint venture (percent) | 70.00% |  |  |  | 70.00% |  | 70.00%
Net losses from Change Healthcare | $ 61 |  |  |  | $ 181 |  |
Carrying value of investment | 3,795 |  |  |  | 3,795 |  |
Excess of carrying value of investment over proportional share of book value | $ 4,671 |  |  |  | $ 4,671 |  |

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