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Healthcare Technology Net Asset Exchange (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2017 | Mar. 31, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net income (loss) from Change Healthcare | $ (56) | $ (120) |  |
Carrying value of investment | 3,672 |  |  | $ 3,728
Change Healthcare, LLC (“Change Healthcare”) | Tax Receivable Agreement (“TRA”) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Noncurrent liability | $ 90 |  |  |
Joint Venture | Core MTS Businesses |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Expected ownership interest in the joint venture (percent) | 70.00% |  |  |
Change Healthcare, LLC (“Change Healthcare”) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net income (loss) recognized by Change Healthcare | $ 5 | 59 |  |
Change Healthcare, LLC (“Change Healthcare”) | Core MTS Businesses | Operating Segments | Other |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Gain from sale of business, pre-tax |  | 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% | 70.00% |  |
Net income (loss) from Change Healthcare | $ (56) | $ (120) |  |
Carrying value of investment | 3,672 |  |  | 3,728
Excess of carrying value of investment over proportional share of book value | 4,422 |  |  | 4,472
Net income (loss) recognized by Change Healthcare | 7 | (84) |  |
Fair value adjustment of carrying value to initial fair value basis | $ 61 | $ 120 |  |
Tax Receivable Agreement (“TRA”) | Change Healthcare, LLC (“Change Healthcare”) |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Noncurrent liability |  |  |  | $ 90

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