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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2025
Mar. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments in equity and debt securities of growth stage companies     $ 119 $ 103
Gains (losses) associated with equity investments $ (15) $ 95    
Gain related to share price increase of equity securities   100    
Proceeds from sale of equity securities   $ 92    
Fair value, inputs, level 1 | Fair Value, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Money market funds at carrying value     $ 828 $ 1,000