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Derivative Instruments - Non Designated Hedges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Other income, net | Foreign currency forward contracts | Not designated as hedging instrument        
Derivative Instruments, Gain (Loss) [Line Items]        
Pretax gain (loss) on derivative instruments $ 13 $ 33 $ 48 $ 58