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Business Combinations - Acquisition of CoverMyMeds (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Apr. 03, 2017 | May 24, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2019
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase consideration paid in cash, net of cash acquired |  |  |  | $ 2,893 | $ 4,237 | $ 40 |
Goodwill | $ 10,924 |  |  | 10,924 | $ 10,586 | $ 9,786 |
CMM |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase consideration paid in cash, net of cash acquired |  | $ 1,300 |  |  |  |  |
Fair value of assets acquired (excluding goodwill and intangibles) | 53 |  |  | 53 |  |  |
Fair value of liabilities assumed | 8 |  |  | 8 |  |  |
Goodwill | 870 |  |  | 870 |  |  |
Expected | CMM |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  |  | $ 160
Investment Assets at Fair Value | CMM |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration | 124 | $ 113 |  | 124 |  |  |
Customer relationships | CMM |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquired identifiable intangibles | $ 487 |  |  | $ 487 |  |  |
Weighted average life | 17 years |  |  |  |  |  |
Subsequent Event | Investment Assets at Fair Value | CMM |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash apayment for contingent consideration earned |  |  | $ 68 |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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