Pension and Other Benefit Plans - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation plan, liability	$ 45			$ 45		$ 48
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Net loss from remeasurement of plan assets and liabilities	(80)		$ (80)	(229)	$ (219)
Curtailment gain	0		0	9	0
Recognition of actuarial loss	$ 0		$ 0	$ 11	$ 0
Foreign Plan [Member] | Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Net loss from remeasurement of plan assets and liabilities		$ 2
Curtailment gain		9
Recognition of actuarial loss		$ 11
Directors
Defined Benefit Plan Disclosure [Line Items]
Maximum deferral percentage				100.00%