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Pension and Other Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Dec. 31, 2021
Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]    
Deferred compensation plan, liability $ 41 $ 42
Directors    
Defined Benefit Plan Disclosure [Line Items]    
Maximum deferral percentage 100.00%