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Pension Benefits - Schedule Of Amounts Recognized In Accumulated Other Comprehensive Income (Details) - Pension Plans, Defined Benefit - USD ($)
$ in Millions
Mar. 31, 2018
Mar. 31, 2017
United States    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss $ 134 $ 157
Prior service credit 0 0
Total 134 157
Non-U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss 162 160
Prior service credit (5) (3)
Total $ 157 $ 157