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Pension Benefits - Schedule Of Amounts Recognized In Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Mar. 31, 2016
U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss $ 157 $ 185
Prior service credit 0 0
Total 157 185
Non-U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Net actuarial loss 160 133
Prior service credit (3) (11)
Total $ 157 $ 122