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Accumulated Other Comprehensive Income Effects on net income of amounts reclassified from accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) $ (166) $ 2 $ 25
Unrealized Gains (Losses) on Available-for-Sale Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) 1 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) 1 0 (1)
Unrealized Gains (Losses) on Derivative Instruments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) (167) 2 26
Unrealized Gains (Losses) on Derivative Instruments | Net revenue      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) (185) 14 30
Unrealized Gains (Losses) on Derivative Instruments | Research and development      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) 18 $ (12) (4)
Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss) $ 0   $ 0