Pension Benefits - Narrative (Details)	12 Months Ended
	Mar. 31, 2024 USD ($) $ / shares	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Percentage of eligible compensation (up to percent)	75.00%
Contribution expenses	$ 138,000,000	$ 125,000,000	$ 116,000,000
First Part Of Pay Contribution
Defined Benefit Plan Disclosure [Line Items]
Company match employee contributions (as a percent)	100.00%
Employee contributions (as a percent)	3.00%
Second Part Of Pay Contribution
Defined Benefit Plan Disclosure [Line Items]
Company match employee contributions (as a percent)	50.00%
Employee contributions (as a percent)	2.00%
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Unexpected actuarial losses (as a percent) (exceeding)	10.00%
Expected benefit payments in 2025	$ 8,000,000
Expected benefit payments in 2026	9,000,000
Expected benefit payments in 2027	10,000,000
Expected benefit payments in 2028	10,000,000
Expected benefit payments in 2029	10,000,000
Other postretirement plan expected future benefit payments, 2030 through 2034	53,000,000
Expected contributions in next fiscal year	$ 4,000,000
Unit value of cash and cash equivalents (in dollars per share) | $ / shares	$ 1.00
Pension Plans, Defined Benefit | Non-U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Actuarial gain (loss)	$ 0	65,000,000
Actuarial gain (loss) resulting from discount rate changes		$ (69,000,000)
Discount rates	4.55%	4.54%	2.67%
Actuarial gain (loss), demographic and assumption changes		$ (4,000,000)
Projected benefit obligation	$ 174,000,000	172,000,000	$ 701,000,000
Increase (decrease) in basis points	0.0001
Percentage of total plan contribution - exceeding (percent)	5.00%
Amounts of plan exceeding total plan contribution	$ 23,000,000	19,000,000	20,000,000
Funded status (as a percent)	79.00%
Amounts accrued for liability	$ 0
Net periodic pension expense	5,000,000	7,000,000	4,000,000
Pension Plans, Defined Benefit | Non-U.S. Plans | Norwegian Public Service Pension Fund (SPK)
Defined Benefit Plan Disclosure [Line Items]
Amount of plan asset value		30,000,000
Pension Plans, Defined Benefit | Non-U.S. Plans | Unfunded plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	19,000,000	18,000,000
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	42,000,000	45,000,000
Net periodic pension expense	$ 0	0	0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | E.U. Businesses (Disposal Group)
Defined Benefit Plan Disclosure [Line Items]
Disposal group, including discontinued operations, pension plan obligation derecognized		75,000,000
Accumulated other comprehensive gain (loss) derecognized		13,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | U.K. Businesses (Disposal Group)
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive gain (loss) derecognized		(30,000,000)
Disposal Group, Disposed of by Sale, Not Discontinued Operations | U.K. Businesses (Disposal Group) | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Disposal group, including discontinued operations, pension plan assets derecognized		49,000,000
Held-for-sale | E.U. And U.K. Businesses (Disposal Group)
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive gain (loss) derecognized		$ (17,000,000)
Held-for-sale | Austrian Business Operations
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive gain (loss) derecognized			(11,000,000)
Held-for-sale | Austrian Business Operations | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Disposal group, pension benefit obligation derecognized			$ 43,000,000