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Discontinued Operations and Assets Held for Sale (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 01, 2020
Jul. 27, 2020
Jan. 01, 2021
Jan. 03, 2020
Jan. 01, 2021
Jan. 03, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Consideration from sale of properties   $ 118        
Gain on sale of property   $ 35 $ 0 $ 0 $ 35 $ 0
Enterprise Security | Discontinued Operations, Disposed of by Sale            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Dedicated direct costs, net of charges, for transition services agreement     $ 0 $ 5 $ 9 $ 5
Agreements, aggregate amount $ 200          
License period 5 years 7 months 6 days