Fair Value Measurements - Schedule of Recurring Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($) $ in Millions	Dec. 31, 2025	Mar. 31, 2025
Assets:
Current derivative instruments	$ 0	$ 1
Long-term deferred compensation plan asset	43	35
Total Assets	492	838
Liabilities:
Current derivative instruments	2	1
Long-term derivative instruments	1	2
Long-term deferred compensation plan liability	43	35
Total Liabilities	46	38
Money market funds
Assets:
Money market funds	449	802
Level 1
Assets:
Current derivative instruments	0	0
Long-term deferred compensation plan asset	43	35
Total Assets	492	837
Liabilities:
Current derivative instruments	0	0
Long-term derivative instruments	0	0
Long-term deferred compensation plan liability	43	35
Total Liabilities	43	35
Level 1 | Money market funds
Assets:
Money market funds	449	802
Level 2
Assets:
Current derivative instruments	0	1
Long-term deferred compensation plan asset	0	0
Total Assets	0	1
Liabilities:
Current derivative instruments	2	1
Long-term derivative instruments	1	2
Long-term deferred compensation plan liability	0	0
Total Liabilities	3	3
Level 2 | Money market funds
Assets:
Money market funds	$ 0	$ 0