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Goodwill and Intangible Assets, Net - Goodwill Narrative (Details) $ in Millions | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 segment | Mar. 31, 2021 USD ($) segment | Mar. 31, 2022 USD ($) segment | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($)
Goodwill [Line Items] |  |  |  |  |
Number of reportable segments | segment | 4 | 4 | 4 |  |
Goodwill impairment charge |  |  | $ 0 | $ 69 | $ 2
Goodwill |  | $ 9,493 | 9,451 | 9,493 | 9,360
International |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment charge |  |  |  | 69 |
Goodwill |  | 1,535 | 1,533 | 1,535 | $ 1,443
Accumulated goodwill impairment loss |  | 3,600 | $ 700 | 3,600 |
International | Europe |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill |  | $ 0 |  | 0 |
Retail Pharmacy Reporting Unit [Member] | International |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Goodwill impairment charge |  |  |  | $ 69 |

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