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Pension and Other Benefit Plans - Pension Plan, Net Periodic Costs and Other Changes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Retirement Benefits [Abstract]        
Service cost $ 18 $ 22 $ 37 $ 45
Interest cost 63 51 130 103
Expected return on assets (122) (146) (254) (293)
Amortization of prior service costs (2) (2) (4) (4)
Contractual termination benefit 0 1 0 1
Recognition of actuarial loss 1 0 1 0
Net periodic pension income $ (42) $ (74) $ (90) $ (148)