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Effects on net income of amounts reclassified from accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Amounts reclassified from accumulated other comprehensive income (loss) $ (14) $ 20 $ 11 $ 14
Unrealized Gains (Losses) on Derivative Instruments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Amounts reclassified from accumulated other comprehensive income (loss) (14) 20 11 14
Unrealized Gains (Losses) on Derivative Instruments [Member] | Sales Revenue, Net        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Amounts reclassified from accumulated other comprehensive income (loss) (12) 22 25 10
Unrealized Gains (Losses) on Derivative Instruments [Member] | Research And Development [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Amounts reclassified from accumulated other comprehensive income (loss) $ (2) $ (2) $ (14) $ 4