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Pension Benefits - Schedule Of Changes In Benefit Obligations And Plan Assets (Details) - Pension Plans, Defined Benefit - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Non-U.S. Plans      
Change in benefit obligations      
Benefit obligation at beginning of period $ 943 $ 899  
Service cost 15 15 $ 20
Interest cost 22 23 24
Actuarial loss (gain) (15) 98  
Benefits paid (42) (34)  
Expenses paid (1) (1)  
Amendments (2) 0  
Acquisitions 0 37  
Foreign exchange impact and other 115 (94)  
Benefit obligation at end of period 1,035 943 899
Change in plan assets      
Fair value of plan assets at beginning of period 623 607  
Actual return on plan assets 21 76  
Employer and participant contributions 17 16  
Benefits paid (42) (34)  
Expenses paid (1) (1)  
Acquisitions 0 35  
Foreign exchange impact and other 69 (76)  
Fair value of plan assets at end of period 687 623 607
Funded status at end of period (348) (320)  
Amounts recognized on the balance sheet      
Assets 19 4  
Current liabilities (7) (7)  
Long-term liabilities (360) (317)  
Total (348) (320)  
United States      
Change in benefit obligations      
Benefit obligation at beginning of period 513 535  
Service cost 3 5 4
Interest cost 14 13 18
Actuarial loss (gain) 1 (11)  
Benefits paid (44) (26)  
Expenses paid (2) (3)  
Amendments 0 0  
Acquisitions 0 0  
Foreign exchange impact and other 0 0  
Benefit obligation at end of period 485 513 535
Change in plan assets      
Fair value of plan assets at beginning of period 293 262  
Actual return on plan assets 35 22  
Employer and participant contributions 53 38  
Benefits paid (44) (26)  
Expenses paid (2) (3)  
Acquisitions 0 0  
Foreign exchange impact and other 0 0  
Fair value of plan assets at end of period 335 293 $ 262
Funded status at end of period (150) (220)  
Amounts recognized on the balance sheet      
Assets 10 0  
Current liabilities (39) (17)  
Long-term liabilities (121) (203)  
Total $ (150) $ (220)