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Segment Information Capital Expenditures and Depreciation and Amortization (Details 7) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Additional information by Segment (Table Amounts) [Abstract]      
Capital Expenditures $ 1,264 $ 1,249 $ 928
Depreciation and amortization 1,018 800 475
Aeronautics Systems      
Additional information by Segment (Table Amounts) [Abstract]      
Capital Expenditures 528 657 574
Depreciation and amortization 224 190 164
Defense Systems      
Additional information by Segment (Table Amounts) [Abstract]      
Capital Expenditures 71 66 14
Depreciation and amortization 44 65 47
Mission Systems      
Additional information by Segment (Table Amounts) [Abstract]      
Capital Expenditures 229 197 158
Depreciation and amortization 133 121 117
Space Systems      
Additional information by Segment (Table Amounts) [Abstract]      
Capital Expenditures 352 226 98
Depreciation and amortization 189 130 77
Corporate      
Additional information by Segment (Table Amounts) [Abstract]      
Capital Expenditures 84 103 84
Depreciation and amortization $ 428 $ 294 $ 70