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Other Income, Net - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Actuarial losses from pension plans | $ (5) | $ 0 | $ 127
German Pharmaceutical Wholesale Joint Venture |  |  |
Segment Reporting Information [Line Items] |  |  |
Noncontrolling interest (percent) | 30.00% |  |
German Wholesale Business |  |  |
Segment Reporting Information [Line Items] |  |  |
Gain from sale of equity method investment (in dollars per share) | $ 42 |  |
Termination of U.S Defined Benefit Pension Plan | United States | Pension Plans, Defined Benefit |  |  |
Segment Reporting Information [Line Items] |  |  |
Actuarial losses from pension plans |  |  | 116
Settlement of Executive Retirement Benefits | United States | Pension Plans, Defined Benefit | Retired executive |  |  |
Segment Reporting Information [Line Items] |  |  |
Actuarial losses from pension plans |  |  | $ 11

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