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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, 2019
Mar. 31, 2018
Mar. 31, 2017
United States      
Change in benefit obligations      
Benefit obligation at beginning of period $ 485 $ 513  
Service cost 0 3 $ 5
Interest cost 14 14 13
Actuarial loss (gain) 4 1  
Benefits paid (64) (44)  
Expenses paid 0 (2)  
Amendments 0 0  
Acquisitions 0 0  
Foreign exchange impact and other 0 0  
Benefit obligation at end of period 439 485 513
Change in plan assets      
Fair value of plan assets at beginning of period 335 293  
Actual return on plan assets 12 35  
Employer and participant contributions 39 53  
Benefits paid (64) (44)  
Expenses paid 0 (2)  
Acquisitions 0 0  
Foreign exchange impact and other 0 0  
Fair value of plan assets at end of period 322 335 293
Funded status at end of period (117) (150)  
Amounts recognized on the balance sheet      
Assets 7 10  
Current liabilities (115) (39)  
Long-term liabilities (9) (121)  
Total (117) (150)  
Non-U.S. Plans      
Change in benefit obligations      
Benefit obligation at beginning of period 1,035 943  
Service cost 15 15 15
Interest cost 21 22 23
Actuarial loss (gain) 35 (15)  
Benefits paid (36) (42)  
Expenses paid (1) (1)  
Amendments 0 (2)  
Acquisitions 1 0  
Foreign exchange impact and other (80) 115  
Benefit obligation at end of period 990 1,035 943
Change in plan assets      
Fair value of plan assets at beginning of period 687 623  
Actual return on plan assets 18 21  
Employer and participant contributions 23 17  
Benefits paid (36) (42)  
Expenses paid (1) (1)  
Acquisitions 0 0  
Foreign exchange impact and other (49) 69  
Fair value of plan assets at end of period 642 687 $ 623
Funded status at end of period (348) (348)  
Amounts recognized on the balance sheet      
Assets 20 19  
Current liabilities (13) (7)  
Long-term liabilities (355) (360)  
Total $ (348) $ (348)