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Allowance For Doubtful Accounts Disclosures Allowance for Doubtful Accounts (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Dec. 28, 2019
Schedule Of Financial Receivables [Line Items]      
Provision for doubtful accounts $ 180 $ 6  
Allowances for vendor receivables 5   $ 4
SEC Schedule, 12-09, Allowance, Credit Loss [Member]      
Schedule Of Financial Receivables [Line Items]      
Allowance for Doubtful Accounts Receivable 30    
Provision for doubtful accounts     180
Adoption of ASU 2016-13 1    
Customer accounts written off—net of recoveries 13    
Allowance for Doubtful Accounts Receivable $ 198   $ 30