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Pension Benefits - Schedule Of Changes In Benefit Obligations And Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
U.S. Plans      
Change in benefit obligations      
Benefit obligation at beginning of period $ 535 $ 583  
Service cost 5 4 $ 1
Interest cost 13 18 19
Actuarial loss (gain) (11) (13)  
Benefits paid (26) (54)  
Expenses paid (3) (3)  
Amendments 0 0  
Acquisitions 0 0  
Foreign exchange impact and other 0 0  
Benefit obligation at end of period 513 535 583
Change in plan assets      
Fair value of plan assets at beginning of period 262 298  
Actual return on plan assets 22 (3)  
Employer and participant contributions 38 24  
Benefits paid (26) (54)  
Expenses paid (3) (3)  
Acquisitions 0 0  
Foreign exchange impact and other 0 0  
Fair value of plan assets at end of period 293 262 298
Funded status at end of period (220) (273)  
Amounts recognized on the balance sheet      
Assets 0 0  
Current liabilities (17) (2)  
Long-term liabilities (203) (271)  
Total (220) (273)  
Non-U.S. Plans      
Change in benefit obligations      
Benefit obligation at beginning of period 899 963  
Service cost 15 20 16
Interest cost 23 24 34
Actuarial loss (gain) 98 (64)  
Benefits paid (34) (35)  
Expenses paid (1) 0  
Amendments 0 (2)  
Acquisitions 37 0  
Foreign exchange impact and other (94) (7)  
Benefit obligation at end of period 943 899 963
Change in plan assets      
Fair value of plan assets at beginning of period 607 612  
Actual return on plan assets 76 2  
Employer and participant contributions 16 44  
Benefits paid (34) (35)  
Expenses paid (1) 0  
Acquisitions 35 0  
Foreign exchange impact and other (76) (16)  
Fair value of plan assets at end of period 623 607 $ 612
Funded status at end of period (320) (292)  
Amounts recognized on the balance sheet      
Assets 4 21  
Current liabilities (7) (11)  
Long-term liabilities (317) (302)  
Total $ (320) $ (292)