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Pension Benefits - Schedule Of Sensitivity To Changes In Weighted-Average Discount Rate For Pension Plans (Details)
$ in Millions
12 Months Ended
Mar. 31, 2016
USD ($)
U.S. Plans  
Defined Benefit Plan Disclosure [Line Items]  
Projected benefit obligation, one percentage point increase $ (35)
Projected benefit obligation, one percentage point decrease 41
Net periodic pension cost, one percentage point increase 0
Net periodic pension cost, one percentage point decrease 0
Non-U.S. Plans  
Defined Benefit Plan Disclosure [Line Items]  
Projected benefit obligation, one percentage point increase (85)
Projected benefit obligation, one percentage point decrease 101
Net periodic pension cost, one percentage point increase (4)
Net periodic pension cost, one percentage point decrease $ 6