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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 6,660 | $ 6,392
Accumulated Amortization | (3,680) | (3,236)
Net Carrying Amount | $ 2,980 | 3,156
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 12 years |
Gross Carrying Amount | $ 3,972 | 3,650
Accumulated Amortization | (2,318) | (1,950)
Net Carrying Amount | $ 1,654 | 1,700
Service agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 10 years |
Gross Carrying Amount | $ 859 | 994
Accumulated Amortization | (402) | (480)
Net Carrying Amount | $ 457 | 514
Pharmacy licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 26 years |
Gross Carrying Amount | $ 503 | 492
Accumulated Amortization | (240) | (232)
Net Carrying Amount | $ 263 | 260
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 12 years |
Gross Carrying Amount | $ 922 | 808
Accumulated Amortization | (379) | (242)
Net Carrying Amount | $ 543 | 566
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 5 years |
Gross Carrying Amount | $ 149 | 175
Accumulated Amortization | (118) | (111)
Net Carrying Amount | $ 31 | 64
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 5 years |
Gross Carrying Amount | $ 255 | 273
Accumulated Amortization | (223) | (221)
Net Carrying Amount | $ 32 | $ 52

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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