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Pension Benefits - Schedule Of Net Periodic Expense For Pension Plans (Details) - Pension Plans, Defined Benefit - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
United States      
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the year $ 0 $ 3 $ 5
Interest cost on projected benefit obligation 14 14 13
Expected return on assets (16) (19) (15)
Amortization of unrecognized actuarial loss and prior service costs 5 6 11
Curtailment/settlement loss (gain) 4 2 0
Net periodic pension expense 7 6 14
Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the year 15 15 15
Interest cost on projected benefit obligation 21 22 23
Expected return on assets (23) (26) (26)
Amortization of unrecognized actuarial loss and prior service costs 4 5 4
Curtailment/settlement loss (gain) 1 1 (2)
Net periodic pension expense $ 18 $ 17 $ 14