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Basis of Presentation (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 01, 2021
Mar. 31, 2021
Mar. 31, 2020
Stock-based Compensation Awards [Member]      
Basis of Presentation [Abstract]      
Antidilutive securities excluded from diluted EPS calculation (in shares)   0  
Diamond Offshore [Member]      
Basis of Presentation [Abstract]      
Asset impairment charge     $ 774
Asset impairment charge, after tax and noncontrolling interests     $ 408
CNA [Member]      
Basis of Presentation [Abstract]      
Subsidiary ownership percentage   89.50%  
Altium Packaging LLC [Member]      
Basis of Presentation [Abstract]      
Subsidiary ownership percentage   99.00%  
Subsequent Event [Member] | Altium Packaging LLC [Member]      
Basis of Presentation [Abstract]      
Percentage interest of subsidiary sold 47.00%