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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
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

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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