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Other Income, Net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Interest income | $ 12 | $ 49 | $ 39
Equity in earnings, net | 48 | 36 | 43
Net gains on investments in equity securities | 133 | 17 | 23
Actuarial losses from pension plans | 0 | (127) | 0
Gain from sale of equity method investment | 0 | 0 | 56
Other, net | 30 | 37 | 21
Total | 223 | 12 | 182
Actuarial losses from pension plans | $ 0 | 127 | $ 0
Termination of U.S Defined Benefit Pension Plan | Pension Plans, Defined Benefit | UNITED STATES |  |  |
Segment Reporting Information [Line Items] |  |  |
Actuarial losses from pension plans |  | (116) |
Actuarial losses from pension plans |  | 116 |
Retired executive | Settlement of Executive Retirement Benefits | Pension Plans, Defined Benefit | UNITED STATES |  |  |
Segment Reporting Information [Line Items] |  |  |
Actuarial losses from pension plans |  | (11) |
Actuarial losses from pension plans |  | $ 11 |

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