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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 6,646 | $ 6,392
Accumulated Amortization | (3,768) | (3,236)
Net Carrying Amount | $ 2,878 | 3,156
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 12 years |
Gross Carrying Amount | $ 3,739 | 3,650
Accumulated Amortization | (2,269) | (1,950)
Net Carrying Amount | $ 1,470 | 1,700
Service agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 10 years |
Gross Carrying Amount | $ 1,081 | 994
Accumulated Amortization | (513) | (480)
Net Carrying Amount | $ 568 | 514
Pharmacy licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 23 years |
Gross Carrying Amount | $ 497 | 492
Accumulated Amortization | (244) | (232)
Net Carrying Amount | $ 253 | 260
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 12 years |
Gross Carrying Amount | $ 925 | 808
Accumulated Amortization | (394) | (242)
Net Carrying Amount | $ 531 | 566
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 4 years |
Gross Carrying Amount | $ 150 | 175
Accumulated Amortization | (122) | (111)
Net Carrying Amount | $ 28 | 64
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 6 years |
Gross Carrying Amount | $ 254 | 273
Accumulated Amortization | (226) | (221)
Net Carrying Amount | $ 28 | $ 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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