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Segment Information Sales by Geographic Location (Details 4) - 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
Revenues from External Customers and Long-Lived Assets [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%
United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 28,687 $ 25,661 $ 22,552
Concentration Risk, Percentage                 85.00% 85.00% 87.00%
Asia/Pacific                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 1,836 $ 1,666 $ 1,461
Concentration Risk, Percentage                 5.00% 6.00% 5.00%
All Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 3,318 $ 2,768 $ 1,991
Concentration Risk, Percentage                 10.00% 9.00% 8.00%
Aeronautics Systems | United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 9,325 $ 8,818 $ 7,887
Concentration Risk, Percentage                 85.00% 86.00% 88.00%
Aeronautics Systems | Asia/Pacific                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 810 $ 677 $ 635
Concentration Risk, Percentage                 7.00% 7.00% 7.00%
Aeronautics Systems | All Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 878 $ 725 $ 472
Concentration Risk, Percentage                 8.00% 7.00% 5.00%
Aeronautics Systems | Intersegment Sales [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 103 $ 73 $ 46
Aeronautics Systems | Operating Segments [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 11,116 $ 10,293 $ 9,040
Concentration Risk, Percentage                 100.00% 100.00% 100.00%
Defense Systems | United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 5,362 $ 4,613 $ 3,779
Concentration Risk, Percentage                 79.00% 79.00% 84.00%
Defense Systems | Asia/Pacific                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 369 $ 365 $ 194
Concentration Risk, Percentage                 5.00% 6.00% 4.00%
Defense Systems | All Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 1,073 $ 884 $ 532
Concentration Risk, Percentage                 16.00% 15.00% 12.00%
Defense Systems | Intersegment Sales [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 691 $ 750 $ 974
Defense Systems | Operating Segments [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 7,495 $ 6,612 $ 5,479
Concentration Risk, Percentage                 100.00% 100.00% 100.00%
Mission Systems | United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 6,843 $ 6,578 $ 6,257
Concentration Risk, Percentage                 79.00% 80.00% 80.00%
Mission Systems | Asia/Pacific                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 637 $ 592 $ 617
Concentration Risk, Percentage                 7.00% 7.00% 8.00%
Mission Systems | All Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 1,202 $ 1,061 $ 948
Concentration Risk, Percentage                 14.00% 13.00% 12.00%
Mission Systems | Intersegment Sales [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 728 $ 718 $ 638
Mission Systems | Operating Segments [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 9,410 $ 8,949 $ 8,460
Concentration Risk, Percentage                 100.00% 100.00% 100.00%
Space Systems | United States                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 7,157 $ 5,652 $ 4,629
Concentration Risk, Percentage                 98.00% 98.00% 99.00%
Space Systems | Asia/Pacific                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 20 $ 32 $ 15
Concentration Risk, Percentage                 0.00% 0.00% 0.00%
Space Systems | All Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 165 $ 98 $ 39
Concentration Risk, Percentage                 2.00% 2.00% 1.00%
Space Systems | Intersegment Sales [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 83 $ 63 $ 36
Space Systems | Operating Segments [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Sales                 $ 7,425 $ 5,845 $ 4,719
Concentration Risk, Percentage                 100.00% 100.00% 100.00%