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Pension Benefits - Schedule of Projected Benefit Obligation, Accumulated Benefit Obligation and Fair Value of Plan Assets for Pension Plans (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
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UNITED STATES |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | $ 9 | $ 10 | $ 439
Accumulated benefit obligation | 9 | 10 |
Fair value of plan assets | 0 | 0 | 322
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | 875 | 896 | 990
Accumulated benefit obligation | 847 | 856 |
Fair value of plan assets | $ 735 | $ 594 | $ 642

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