Pension and Other Benefit Plans - Schedule of Components of Net Periodic Pension Expense (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2018	Dec. 31, 2018
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 0	$ 0
Interest cost	5	11
Expected return on assets	(8)	(17)
Net periodic pension benefit	$ (3)	$ (6)