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Retirement and Other Post-Retirement Benefit Plans - Pension Plan, Assumptions and Other Selected Information (Details) - Pension Plans, Defined Benefit - USD ($)
$ in Millions
Mar. 31, 2017
Apr. 01, 2016
Benefit Plans with Projected Benefit Obligation in Excess of Plan Assets    
Projected benefit obligation $ 996 $ 693
Accumulated benefit obligation 963 658
Fair value of plan assets 624 366
Benefit Plans with Accumulated Benefit Obligation in Excess of Plan Assets    
Projected benefit obligation 938 668
Accumulated benefit obligation 913 640
Fair value of plan assets $ 574 $ 346