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Pension and Other Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 30, 2016
Dec. 31, 2017
Dec. 30, 2016
Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]          
Employer contribution $ 8   $ 40    
Deferred compensation plan, liability 74   $ 74   $ 67
Non-employee directors          
Defined Benefit Plan Disclosure [Line Items]          
Maximum deferral percentage     100.00%    
Defined Benefit Pension Plans          
Defined Benefit Plan Disclosure [Line Items]          
Expected employer contributions during remainder of Fiscal 2018 31   $ 31    
Remeasurement Gain 17        
Curtailment gain 40 $ 0 40 $ 0  
Recognition of actuarial loss $ 23 $ 0 $ 23 $ 0