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Segment Information Sales by Contract Type (Details 3) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue, Contract Type [Line Items]                      
Sales $ 8,721 $ 8,475 $ 8,456 $ 8,189 $ 8,156 $ 8,085 $ 7,119 $ 6,735 $ 33,841 $ 30,095 $ 26,004
Concentration Risk, Percentage                 100.00% 100.00% 100.00%
Operating Segments [Member] | Aeronautics Systems                      
Revenue, Contract Type [Line Items]                      
Sales                 $ 11,116 $ 10,293 $ 9,040
Concentration Risk, Percentage                 100.00% 100.00% 100.00%
Operating Segments [Member] | Defense Systems                      
Revenue, Contract Type [Line Items]                      
Sales                 $ 7,495 $ 6,612 $ 5,479
Concentration Risk, Percentage                 100.00% 100.00% 100.00%
Operating Segments [Member] | Mission Systems                      
Revenue, Contract Type [Line Items]                      
Sales                 $ 9,410 $ 8,949 $ 8,460
Concentration Risk, Percentage                 100.00% 100.00% 100.00%
Operating Segments [Member] | Space Systems                      
Revenue, Contract Type [Line Items]                      
Sales                 $ 7,425 $ 5,845 $ 4,719
Concentration Risk, Percentage                 100.00% 100.00% 100.00%
Cost-type                      
Revenue, Contract Type [Line Items]                      
Sales                 $ 16,479 $ 15,004 $ 14,197
Concentration Risk, Percentage                 49.00% 50.00% 55.00%
Cost-type | Aeronautics Systems                      
Revenue, Contract Type [Line Items]                      
Sales                 $ 5,299 $ 5,066 $ 4,743
Concentration Risk, Percentage                 48.00% 50.00% 53.00%
Cost-type | Defense Systems                      
Revenue, Contract Type [Line Items]                      
Sales                 $ 2,509 $ 2,386 $ 2,354
Concentration Risk, Percentage                 37.00% 41.00% 52.00%
Cost-type | Mission Systems                      
Revenue, Contract Type [Line Items]                      
Sales                 $ 3,335 $ 3,099 $ 2,919
Concentration Risk, Percentage                 38.00% 38.00% 37.00%
Cost-type | Space Systems                      
Revenue, Contract Type [Line Items]                      
Sales                 $ 5,336 $ 4,453 $ 4,181
Concentration Risk, Percentage                 73.00% 77.00% 89.00%
Fixed-price                      
Revenue, Contract Type [Line Items]                      
Sales                 $ 17,362 $ 15,091 $ 11,807
Concentration Risk, Percentage                 51.00% 50.00% 45.00%
Fixed-price | Aeronautics Systems                      
Revenue, Contract Type [Line Items]                      
Sales                 $ 5,714 $ 5,154 $ 4,251
Concentration Risk, Percentage                 52.00% 50.00% 47.00%
Fixed-price | Defense Systems                      
Revenue, Contract Type [Line Items]                      
Sales                 $ 4,295 $ 3,476 $ 2,151
Concentration Risk, Percentage                 63.00% 59.00% 48.00%
Fixed-price | Mission Systems                      
Revenue, Contract Type [Line Items]                      
Sales                 $ 5,347 $ 5,132 $ 4,903
Concentration Risk, Percentage                 62.00% 62.00% 63.00%
Fixed-price | Space Systems                      
Revenue, Contract Type [Line Items]                      
Sales                 $ 2,006 $ 1,329 $ 502
Concentration Risk, Percentage                 27.00% 23.00% 11.00%
Intersegment Sales [Member] | Aeronautics Systems                      
Revenue, Contract Type [Line Items]                      
Sales                 $ 103 $ 73 $ 46
Intersegment Sales [Member] | Defense Systems                      
Revenue, Contract Type [Line Items]                      
Sales                 691 750 974
Intersegment Sales [Member] | Mission Systems                      
Revenue, Contract Type [Line Items]                      
Sales                 728 718 638
Intersegment Sales [Member] | Space Systems                      
Revenue, Contract Type [Line Items]                      
Sales                 $ 83 $ 63 $ 36