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Segment Information Sales by Customer Type (Details 2) - 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, Major Customer [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%
US Government                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 27,934 $ 24,796 $ 21,969
Concentration Risk, Percentage                 83.00% 82.00% 85.00%
US Government | Aeronautics Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 9,258 $ 8,732 $ 7,817
Concentration Risk, Percentage                 83.00% 85.00% 86.00%
US Government | Defense Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 4,952 $ 4,132 $ 3,422
Concentration Risk, Percentage                 66.00% 62.00% 62.00%
US Government | Mission Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 6,765 $ 6,501 $ 6,186
Concentration Risk, Percentage                 72.00% 73.00% 73.00%
US Government | Space Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 6,959 $ 5,431 $ 4,544
Concentration Risk, Percentage                 94.00% 93.00% 96.00%
International                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 5,154 $ 4,434 $ 3,452
Concentration Risk, Percentage                 15.00% 15.00% 13.00%
International | Aeronautics Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 1,688 $ 1,402 $ 1,107
Concentration Risk, Percentage                 15.00% 13.00% 12.00%
International | Defense Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 1,442 $ 1,249 $ 726
Concentration Risk, Percentage                 19.00% 19.00% 13.00%
International | Mission Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 1,839 $ 1,653 $ 1,565
Concentration Risk, Percentage                 19.00% 18.00% 18.00%
International | Space Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 185 $ 130 $ 54
Concentration Risk, Percentage                 2.00% 2.00% 1.00%
Other Customers                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 753 $ 865 $ 583
Concentration Risk, Percentage                 2.00% 3.00% 2.00%
Other Customers | Aeronautics Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 67 $ 86 $ 70
Concentration Risk, Percentage                 1.00% 1.00% 1.00%
Other Customers | Defense Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 410 $ 481 $ 357
Concentration Risk, Percentage                 6.00% 7.00% 7.00%
Other Customers | Mission Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 78 $ 77 $ 71
Concentration Risk, Percentage                 1.00% 1.00% 1.00%
Other Customers | Space Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 198 $ 221 $ 85
Concentration Risk, Percentage                 3.00% 4.00% 2.00%
Intersegment Sales [Member] | Aeronautics Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 103 $ 73 $ 46
Concentration Risk, Percentage                 1.00% 1.00% 1.00%
Intersegment Sales [Member] | Defense Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 691 $ 750 $ 974
Concentration Risk, Percentage                 9.00% 12.00% 18.00%
Intersegment Sales [Member] | Mission Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 728 $ 718 $ 638
Concentration Risk, Percentage                 8.00% 8.00% 8.00%
Intersegment Sales [Member] | Space Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 83 $ 63 $ 36
Concentration Risk, Percentage                 1.00% 1.00% 1.00%
Operating Segments [Member] | Aeronautics Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 11,116 $ 10,293 $ 9,040
Concentration Risk, Percentage                 100.00% 100.00% 100.00%
Operating Segments [Member] | Defense Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 7,495 $ 6,612 $ 5,479
Concentration Risk, Percentage                 100.00% 100.00% 100.00%
Operating Segments [Member] | Mission Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 9,410 $ 8,949 $ 8,460
Concentration Risk, Percentage                 100.00% 100.00% 100.00%
Operating Segments [Member] | Space Systems                      
Revenue, Major Customer [Line Items]                      
Sales                 $ 7,425 $ 5,845 $ 4,719
Concentration Risk, Percentage                 100.00% 100.00% 100.00%