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OTHER - Investments in Advanced Military Maintenance, Repair and Overhaul Center LLC (AMMROC) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended
Sep. 30, 2021
Jul. 31, 2020
Sep. 26, 2021
Sep. 27, 2020
Investment Holdings [Line Items]        
Equity method investment impairment     $ 0 $ 128
AMMROC        
Investment Holdings [Line Items]        
Proceeds from sale of investment   $ 307 231  
Equity method investments     307  
Equity method investment impairment     128  
Equity method investment impairment, after tax     $ 96  
Equity method investment impairment (in dollars per share)     $ 0.34  
AMMROC | Subsequent Event        
Investment Holdings [Line Items]        
Proceeds from sale of investment $ 76