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Accumulated Other Comprehensive Income (Loss) - Effects on net income of amounts reclassified from accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) $ (7) $ (48) $ (166)
Unrealized Gains (Losses) on Available-for-Sale Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 1
Unrealized Gains (Losses) on Available-for-Sale Securities | Interest and other income (expense), net      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 1
Unrealized Net Gains (Losses) on Derivative Instruments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) (7) (48) (167)
Unrealized Net Gains (Losses) on Derivative Instruments | Net revenue      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) (18) (56) (185)
Unrealized Net Gains (Losses) on Derivative Instruments | Research and development      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) $ 11 $ 8 $ 18