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Pension and Other Benefit Plans (Tables)
6 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The components of net periodic pension income were:
Three Months EndedSix Months Ended
(in millions)September 30, 2021September 30, 2020September 30, 2021September 30, 2020
Service cost$22 $23 $45 $45 
Interest cost51 61 103 119 
Expected return on assets(146)(161)(293)(314)
Amortization of prior service costs(2)(2)(4)(4)
Contractual termination benefit
Curtailment gain— — — (9)
Recognition of actuarial loss— — — 11 
Net periodic pension income$(74)$(76)$(148)$(149)