Pension and Other Benefit Plans - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	May 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation			$ 489,000,000
Fair value of plan assets			419,000,000
Defined benefit asset in current asset			7,000,000
Defined benefit liability in other long-term liabilities			$ 77,000,000
Employer contribution	$ 0	$ 0
Expected employer contributions during the remainder of fiscal year	0	$ 0
ES DCP
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation deferral percentage		100.00%
Deferred compensation plan, liability	3,000,000	$ 3,000,000
DCP
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation deferral percentage		100.00%
Deferred compensation plan, liability	$ 10,000,000	$ 10,000,000