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Revenue - Revenue by Contract Type (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2018 | Jul. 02, 2017 | Jul. 01, 2018 | Jul. 02, 2017
Revenue [Line Items] |  |  |  |
Cost-reimbursement | $ 2,373 | $ 2,038 | $ 4,297 | $ 4,056
Revenue | 9,186 | 7,675 | 16,721 | 15,116
Aerospace |  |  |  |
Revenue [Line Items] |  |  |  |
Cost-reimbursement | 0 | 0 | 0 | 0
Revenue | 1,895 | 2,078 | 3,720 | 4,152
Combat Systems |  |  |  |
Revenue [Line Items] |  |  |  |
Cost-reimbursement | 197 | 196 | 376 | 403
Revenue | 1,534 | 1,414 | 2,974 | 2,701
Information Technology |  |  |  |
Revenue [Line Items] |  |  |  |
Cost-reimbursement | 930 | 555 | 1,507 | 1,108
Revenue | 2,442 | 1,052 | 3,580 | 2,110
Mission Systems |  |  |  |
Revenue [Line Items] |  |  |  |
Cost-reimbursement | 451 | 463 | 891 | 920
Revenue | 1,147 | 1,052 | 2,245 | 2,140
Marine Systems |  |  |  |
Revenue [Line Items] |  |  |  |
Cost-reimbursement | 795 | 824 | 1,523 | 1,625
Revenue | 2,168 | 2,079 | 4,202 | 4,013
Fixed-price |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 6,115 | 5,265 | 11,348 | 10,300
Fixed-price | Aerospace |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,696 | 1,913 | 3,364 | 3,815
Fixed-price | Combat Systems |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,330 | 1,207 | 2,583 | 2,280
Fixed-price | Information Technology |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,059 | 339 | 1,446 | 690
Fixed-price | Mission Systems |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 658 | 553 | 1,278 | 1,132
Fixed-price | Marine Systems |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 1,372 | 1,253 | 2,677 | 2,383
Time-and-materials |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 698 | 372 | 1,076 | 760
Time-and-materials | Aerospace |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 199 | 165 | 356 | 337
Time-and-materials | Combat Systems |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 7 | 11 | 15 | 18
Time-and-materials | Information Technology |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 453 | 158 | 627 | 312
Time-and-materials | Mission Systems |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | 38 | 36 | 76 | 88
Time-and-materials | Marine Systems |  |  |  |
Revenue [Line Items] |  |  |  |
Revenue | $ 1 | $ 2 | $ 2 | $ 5

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