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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments in equity and debt securities of growth stage companies $ 103 $ 103 $ 240  
Net gains (losses) on investments in equity securities   101 (24) $ (36)
Gain related to share price increase of equity securities   100    
Proceeds from sale of equity securities   92    
Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Gain related to share price increase of equity securities   44    
Proceeds from sale of equity securities 97      
Impairment loss 44      
Level 1 | Fair Value, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Investments in money market funds $ 1,000 $ 1,000 $ 705