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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, 2018
Mar. 31, 2017
Mar. 31, 2016
United States      
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the year $ 3 $ 5 $ 4
Interest cost on projected benefit obligation 14 13 18
Expected return on assets (19) (15) (19)
Amortization of unrecognized actuarial loss and prior service costs 6 11 42
Curtailment/settlement loss (gain) 2 0 2
Net periodic expense 6 14 47
Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Service cost - benefits earned during the year 15 15 20
Interest cost on projected benefit obligation 22 23 24
Expected return on assets (26) (26) (30)
Amortization of unrecognized actuarial loss and prior service costs 5 4 3
Curtailment/settlement loss (gain) 1 (2) 0
Net periodic expense $ 17 $ 14 $ 17