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Restructuring Activities - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended 15 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Office Space Reductions      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related cost, incurred cost     $ 59
Office Space Reductions | Restructuring      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related cost, incurred cost $ 52    
Office Space Reductions | General and administrative      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related cost, incurred cost 7    
2024 Restructuring Plan      
Restructuring Cost and Reserve [Line Items]      
Restructuring costs     $ 123
Restructuring and related cost, incurred cost 62 $ 61  
2024 Restructuring Plan | Office Space Reductions      
Restructuring Cost and Reserve [Line Items]      
Restructuring and related cost, incurred cost $ 57 $ 2