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Fair Value Measurements - Schedule of Recurring Fair Value Measurements (Details) - Recurring Fair Value Measurements - USD ($)
$ in Millions
Sep. 30, 2025
Mar. 31, 2025
Assets:    
Current derivative instruments $ 0 $ 1
Long-term deferred compensation plan asset 44 35
Total Assets 44 36
Liabilities:    
Current derivative instruments 2 1
Long-term derivative instruments 2 2
Long-term deferred compensation plan liability 44 35
Total Liabilities 48 38
Level 1    
Assets:    
Current derivative instruments 0 0
Long-term deferred compensation plan asset 44 35
Total Assets 44 35
Liabilities:    
Current derivative instruments 0 0
Long-term derivative instruments 0 0
Long-term deferred compensation plan liability 44 35
Total Liabilities 44 35
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 2 2
Long-term deferred compensation plan liability 0 0
Total Liabilities $ 4 $ 3