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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Operating Loss Carryforwards [Line Items]      
Net operating losses $ 10 $ 9  
Reserves for uncertain tax positions 142 115 $ 552
Unrecognized tax benefits that would impact effective tax rate 125 104 91
Unrecognized tax benefits that decrease deferred tax assets 3 1  
Accrued interest and penalties 7 7 3
Income tax reserve, accrued penalties and interest 20 $ 13 $ 6
Federal      
Operating Loss Carryforwards [Line Items]      
Net operating losses 1    
State      
Operating Loss Carryforwards [Line Items]      
Net operating losses 4    
Foreign      
Operating Loss Carryforwards [Line Items]      
Net operating losses $ 5