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Business Acquisitions and Divestitures - Acquisition of RxCrossroads (Details) - USD ($) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Jan. 02, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |
Cash purchase consideration |  |  | $ 133 | $ 905 | $ 2,893
Goodwill |  |  | $ 9,360 | $ 9,358 | $ 10,924
RxCrossroads |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash purchase consideration |  | $ 720 |  |  |
Fair value of assets acquired (excluding goodwill and intangibles) | $ 129 |  |  |  |
Fair value of liabilities assumed | 57 |  |  |  |
Goodwill | 386 |  |  |  |
Intangible assets | $ 262 |  |  |  |
Weighted average life (years) | 14 years |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -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 intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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