Pension Benefits - Summary of Pension Plan Assets Using Fair Value Hierarchy by Asset Class (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]
Fair value of plan assets	$ 0	$ 0	$ 322
Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	735	594	$ 642
Non-U.S. Plans | Investment Assets at Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	683	552
Non-U.S. Plans | Investment Assets at Fair Value | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	162	215
Non-U.S. Plans | Investment Assets at Fair Value | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	517	334
Non-U.S. Plans | Investment Assets at Fair Value | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	3
Non-U.S. Plans | Cash and cash equivalents | Investment Assets at Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5	13
Non-U.S. Plans | Cash and cash equivalents | Investment Assets at Fair Value | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5	13
Non-U.S. Plans | Cash and cash equivalents | Investment Assets at Fair Value | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Cash and cash equivalents | Investment Assets at Fair Value | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Equity commingled funds | Investment Assets at Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	181	128
Non-U.S. Plans | Equity commingled funds | Investment Assets at Fair Value | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	64	53
Non-U.S. Plans | Equity commingled funds | Investment Assets at Fair Value | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	117	75
Non-U.S. Plans | Equity commingled funds | Investment Assets at Fair Value | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Equity commingled funds | Assets held at NAV practical expedient
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10	8
Non-U.S. Plans | Government securities | Investment Assets at Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	149	145
Non-U.S. Plans | Government securities | Investment Assets at Fair Value | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5	6
Non-U.S. Plans | Government securities | Investment Assets at Fair Value | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	144	139
Non-U.S. Plans | Government securities | Investment Assets at Fair Value | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Corporate bonds | Investment Assets at Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	36	31
Non-U.S. Plans | Corporate bonds | Investment Assets at Fair Value | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6	14
Non-U.S. Plans | Corporate bonds | Investment Assets at Fair Value | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	30	17
Non-U.S. Plans | Corporate bonds | Investment Assets at Fair Value | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Non-U.S. Plans | Fixed income commingled funds | Investment Assets at Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	274	208
Non-U.S. Plans | Fixed income commingled funds | Investment Assets at Fair Value | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	51	107
Non-U.S. Plans | Fixed income commingled funds | Investment Assets at Fair Value | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	222	101
Non-U.S. Plans | Fixed income commingled funds | Investment Assets at Fair Value | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	0
Non-U.S. Plans | Real estate funds and Other | Investment Assets at Fair Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	38	27
Non-U.S. Plans | Real estate funds and Other | Investment Assets at Fair Value | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	31	22
Non-U.S. Plans | Real estate funds and Other | Investment Assets at Fair Value | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4	2
Non-U.S. Plans | Real estate funds and Other | Investment Assets at Fair Value | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3	3
Non-U.S. Plans | Real estate funds and Other | Assets held at NAV practical expedient
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 42	$ 34