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Healthcare Technology Net Asset Exchange (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 01, 2017 | Mar. 31, 2017 | Mar. 31, 2017 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Pre-tax gain on sale of business |  |  |  | $ (94) | $ 103 | $ 0
Carrying value of equity method investments |  | $ 4,063 | $ 4,063 | 4,063 | $ 0 |
Corporate Joint Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Carrying value of equity method investments |  | 4,063 | 4,063 | 4,063 |  |
Excess of carrying value over proportionate share of investment net assets |  | 4,762 | 4,762 | 4,762 |  |
Change Healthcare Long-term Debt | Change |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Aggregate principal amount | $ 6,100 |  |  |  |  |
Core MTS Businesses | Corporate Joint Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership interest in Joint Venture (percent) | 70.00% |  |  |  |  |
Core MTS Businesses | Technology Solutions | Operating Segments |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Pre-tax gain on sale of business |  |  | 3,947 | $ 3,947 |  |
Gain from sale of business, after tax |  |  | $ 3,018 |  |  |
Carrying value of disposition of net assets | $ 1,132 |  |  |  |  |
Promissory notes contributed | 1,258 |  |  |  |  |
Proceeds from promissory notes repaid | $ 1,258 |  |  |  |  |
Transition Services Agreements (“TSA”) | Corporate Joint Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Entitled payment percentage per the ancillary agreement (percent) | 1.00% |  |  |  |  |
Minimum | Core MTS Businesses | Corporate Joint Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Proportionate share of transaction expenses incurred |  | 80 |  |  |  |
Maximum | Core MTS Businesses | Corporate Joint Venture |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Proportionate share of transaction expenses incurred |  | $ 120 |  |  |  |
Change Healthcare | Change |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Direct transaction expenses incurred | $ 1,750 |  |  |  |  |
Repayments of Debt | 2,800 |  |  |  |  |
Tax Receivable Agreement (“TRA”) | Change Healthcare |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Noncurrent liability | $ 136 |  |  |  |  |

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