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OTHER - Changes in Estimates (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 29, 2020
satellite
Jun. 28, 2020
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
$ / shares
Jun. 28, 2020
USD ($)
satellite
$ / shares
Jun. 30, 2019
USD ($)
$ / shares
Dec. 31, 2019
satellite
Jun. 27, 2020
USD ($)
Change in Accounting Estimate [Line Items]              
Performance obligation satisfied in previous period   $ 495 $ 560 $ 1,000 $ 1,200    
Number of satellites launched or to be launched | satellite 1     3   2  
Equity method investment impairment   128   $ 128 0    
AMMROC              
Change in Accounting Estimate [Line Items]              
Equity method investment impairment       128      
Equity method investment other than temporary impairment net of tax       $ 96      
Equity method investment other than temporary impairment earnings per share (in dollars per share) | $ / shares       $ 0.34      
Equity method investments   307   $ 307     $ 435
Ground Based Radar              
Change in Accounting Estimate [Line Items]              
Cumulative losses on development   240   240      
EADGE-T              
Change in Accounting Estimate [Line Items]              
Cumulative losses on development   260   260      
LM 2100 Project              
Change in Accounting Estimate [Line Items]              
Cumulative losses on development   410   410      
Warrior Capability Sustainment Program              
Change in Accounting Estimate [Line Items]              
Cumulative losses on development   140   140      
Contracts Accounted for under Percentage of Completion              
Change in Accounting Estimate [Line Items]              
Increase in operating profit due to profit rate adjustments   480 420 945 985    
Increase in net earnings due to profit rate adjustments   $ 379 $ 332 $ 747 $ 778    
Increase in diluted earnings per common share due to profit rate adjustments (in dollars per share) | $ / shares   $ 1.35 $ 1.17 $ 2.65 $ 2.74    
Space              
Change in Accounting Estimate [Line Items]              
Number of commercial satellite programs with performance issues | satellite           2