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Divestitures and Deconsolidations (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 01, 2021
Dec. 31, 2021
Dec. 31, 2020
Acquisitions, Divestitures and Deconsolidation [Abstract]      
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]   Gain (Loss) on Investments  
Diamond Offshore      
Acquisitions, Divestitures and Deconsolidation [Abstract]      
Deconsolidation loss     $ (1,200)
Deconsolidation loss, after tax     (957)
Loews Hotels & Co      
Acquisitions, Divestitures and Deconsolidation [Abstract]      
Proceeds from sale of assets   $ 77 $ 57
Altium Packaging LLC      
Acquisitions, Divestitures and Deconsolidation [Abstract]      
Percentage of equity method investments in associated companies 47.00%    
Altium Packaging LLC | Discontinued Operations, Disposed of by Sale      
Acquisitions, Divestitures and Deconsolidation [Abstract]      
Percentage of equity method investments in associated companies 47.00%    
Proceeds from sale of equity method investments $ 420    
Gain on disposal   555  
Gain on disposal after tax   438  
Investment fair value   $ 473