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Pension and Other Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Deferred compensation plan, liability | $ 45 |  |  | $ 45 |  | $ 48
Pension Plans, Defined Benefit |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Net loss from remeasurement of plan assets and liabilities | (80) |  | $ (80) | (229) | $ (219) |
Curtailment gain | 0 |  | 0 | 9 | 0 |
Recognition of actuarial loss | $ 0 |  | $ 0 | $ 11 | $ 0 |
Foreign Plan [Member] | Pension Plans, Defined Benefit |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Net loss from remeasurement of plan assets and liabilities |  | $ 2 |  |  |  |
Curtailment gain |  | 9 |  |  |  |
Recognition of actuarial loss |  | $ 11 |  |  |  |
Directors |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Maximum deferral percentage |  |  |  | 100.00% |  |

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