XML 234 R82.htm IDEA: XBRL DOCUMENT v3.21.2
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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Retirement Benefits [Abstract]        
Service cost $ 22 $ 23 $ 45 $ 45
Interest cost 51 61 103 119
Expected return on assets (146) (161) (293) (314)
Amortization of prior service costs (2) (2) (4) (4)
Contractual termination benefit 1 3 1 3
Curtailment gain 0 0 0 (9)
Recognition of actuarial loss 0 0 0 11
Net periodic pension income $ (74) $ (76) $ (148) $ (149)