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Goodwill and Intangible Assets, Net - Schedule of Information Regarding Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 4,996 | $ 6,646
Accumulated Amortization | (2,937) | (3,768)
Net Carrying Amount | 2,059 | 2,878
Held-for-sale | European Assets Held for Sale |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets, net | $ 384 |
Customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 12 years |
Gross Carrying Amount | $ 2,777 | 3,739
Accumulated Amortization | (1,691) | (2,269)
Net Carrying Amount | $ 1,086 | 1,470
Service agreements |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 9 years |
Gross Carrying Amount | $ 1,085 | 1,081
Accumulated Amortization | (573) | (513)
Net Carrying Amount | 512 | 568
Pharmacy licenses |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 0 | 497
Accumulated Amortization | 0 | (244)
Net Carrying Amount | $ 0 | 253
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 12 years |
Gross Carrying Amount | $ 819 | 925
Accumulated Amortization | (386) | (394)
Net Carrying Amount | $ 433 | 531
Technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 1 year |
Gross Carrying Amount | $ 128 | 150
Accumulated Amortization | (116) | (122)
Net Carrying Amount | $ 12 | 28
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Weighted- Average Remaining Amortization Period (Years) | 9 years |
Gross Carrying Amount | $ 187 | 254
Accumulated Amortization | (171) | (226)
Net Carrying Amount | $ 16 | $ 28

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