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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, 2024
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) $ (48) $ (166) $ 2
Unrealized Gains (Losses) on Available-for-Sale Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) 0 1 0
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 1 0
Unrealized Gains (Losses) on Derivative Instruments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) (48) (167) 2
Unrealized Gains (Losses) on Derivative Instruments | Net revenue      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) (56) (185) 14
Unrealized Gains (Losses) on Derivative Instruments | Research and development      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) $ 8 $ 18 $ (12)