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Contract Assets and Contract Liabilities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 02, 2021
Jul. 03, 2020
Jul. 02, 2021
Jul. 03, 2020
Jan. 01, 2021
Revenue from Contract with Customer [Abstract]          
U.S. Government's progress payment rate 90.00%   90.00%   80.00%
Recognized sales on contract liabilities $ 219 $ 301 $ 727 $ 785