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Business Acquisitions and Divestitures - Acquisition of CoverMyMeds (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 03, 2017 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Purchase consideration paid in cash, net of cash acquired |  | $ 133,000,000 | $ 905,000,000 | $ 2,893,000,000
CMM |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase consideration paid in cash, net of cash acquired | $ 1,300,000,000 |  |  |
Additional contingent consideration that may be paid | 160,000,000 |  |  |
Contingent consideration | $ 113,000,000 | $ 0 | 69,000,000 |
Cash payment for contingent consideration earned |  |  | $ 69,000,000 | $ 68,000,000

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