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Healthcare Technology Net Asset Exchange (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2016 | Mar. 01, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |
Gain on Healthcare Technology Net Asset Exchange | $ 37 |  | $ 0 |
Net losses from Change Healthcare | 120 |  | $ 0 |
Carrying value of investment | 3,855 | $ 4,063 |  |
Tax Receivable Agreement (“TRA”) | Change Healthcare, LLC (“Change Healthcare”) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Noncurrent liability | 136 | 136 |  |
Joint Venture | Transition Services Agreements (“TSA”) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Reimbursements for transition services fees | 37 |  |  |
Change Healthcare, LLC (“Change Healthcare”) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Proportionate share of net loss reported by joint venture | 59 |  |  |
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 |  |
Change Healthcare, LLC (“Change Healthcare”) | Joint Venture |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Expected ownership interest in the joint venture (percent) |  |  |  | 70.00%
Receivable from Change Healthcare | 126 |  |  |
Net losses from Change Healthcare | 120 |  |  |
Carrying value of investment | 3,855 |  |  |
Excess of carrying value of investment over proportional share of book value | 4,768 |  |  |
Proportionate share of net loss reported by joint venture | $ 84 |  |  |

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