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Significant Accounting Policies - Schedule of Effect of Adoption of ASU 606 on Cash Flow (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 24, 2018 | Mar. 25, 2018 | Dec. 31, 2017 | Sep. 24, 2017 | Jun. 25, 2017 | Mar. 26, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating activities |  |  |  |  |  |  |  |  |  |  |
Net earnings | $ 1,253 | $ 1,473 | $ 1,163 | $ 1,157 | $ (744) | $ 963 | $ 955 | $ 789 | $ 5,046 | $ 1,963 | $ 5,173
Adjustments to reconcile net earnings to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,161 | 1,195 | 1,215
Stock-based compensation |  |  |  |  |  |  |  |  | 173 | 158 | 149
Deferred income taxes |  |  |  |  |  |  |  |  | (244) | 3,448 | (193)
Severance and restructuring charges |  |  |  |  |  |  |  |  | 96 | 0 | 99
Gain on property sale |  |  |  |  |  |  |  |  | 0 | (198) | 0
Gain on divestiture of IS&GS business |  |  |  |  |  |  |  |  | 0 | (73) | (1,201)
Gain on step acquisition of AWE |  |  |  |  |  |  |  |  | 0 | 0 | (104)
Changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  |
Receivables, net |  |  |  |  |  |  |  |  | (179) | (902) | 598
Contract assets |  |  |  |  |  |  |  |  | (1,480) | 390 | (1,246)
Inventories |  |  |  |  |  |  |  |  | (119) | (79) | 173
Accounts payable |  |  |  |  |  |  |  |  | 914 | (189) | (188)
Contract liabilities |  |  |  |  |  |  |  |  | (537) | 353 | (163)
Postretirement benefit plans |  |  |  |  |  |  |  |  | (3,574) | 1,316 | 1,028
Income taxes |  |  |  |  |  |  |  |  | 1,077 | (1,210) | 146
Other, net |  |  |  |  |  |  |  |  | 804 | 304 | (297)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | $ 3,138 | 6,476 | 5,189
Historical |  |  |  |  |  |  |  |  |  |  |
Operating activities |  |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  |  | 2,002 | 5,302
Adjustments to reconcile net earnings to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 1,195 | 1,215
Stock-based compensation |  |  |  |  |  |  |  |  |  | 158 | 149
Deferred income taxes |  |  |  |  |  |  |  |  |  | 3,432 | (152)
Severance and restructuring charges |  |  |  |  |  |  |  |  |  |  | 99
Gain on property sale |  |  |  |  |  |  |  |  |  | (198) |
Gain on divestiture of IS&GS business |  |  |  |  |  |  |  |  |  | (73) | (1,242)
Gain on step acquisition of AWE |  |  |  |  |  |  |  |  |  |  | (104)
Changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  |
Receivables, net |  |  |  |  |  |  |  |  |  | (401) | (811)
Contract assets |  |  |  |  |  |  |  |  |  | 0 | 0
Inventories |  |  |  |  |  |  |  |  |  | 183 | (46)
Accounts payable |  |  |  |  |  |  |  |  |  | (189) | (188)
Contract liabilities |  |  |  |  |  |  |  |  |  | (24) | 3
Postretirement benefit plans |  |  |  |  |  |  |  |  |  | 1,316 | 1,028
Income taxes |  |  |  |  |  |  |  |  |  | (1,210) | 146
Other, net |  |  |  |  |  |  |  |  |  | 285 | (210)
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | 6,476 | 5,189
ASC 606 | Adjustments for |  |  |  |  |  |  |  |  |  |  |
Operating activities |  |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  |  | (39) | (129)
Adjustments to reconcile net earnings to net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 0 | 0
Stock-based compensation |  |  |  |  |  |  |  |  |  | 0 | 0
Deferred income taxes |  |  |  |  |  |  |  |  |  | 16 | (41)
Severance and restructuring charges |  |  |  |  |  |  |  |  |  |  | 0
Gain on property sale |  |  |  |  |  |  |  |  |  | 0 |
Gain on divestiture of IS&GS business |  |  |  |  |  |  |  |  |  | 0 | 41
Gain on step acquisition of AWE |  |  |  |  |  |  |  |  |  |  | 0
Changes in assets and liabilities |  |  |  |  |  |  |  |  |  |  |
Receivables, net |  |  |  |  |  |  |  |  |  | (501) | 1,409
Contract assets |  |  |  |  |  |  |  |  |  | 390 | (1,246)
Inventories |  |  |  |  |  |  |  |  |  | (262) | 219
Accounts payable |  |  |  |  |  |  |  |  |  | 0 | 0
Contract liabilities |  |  |  |  |  |  |  |  |  | 377 | (166)
Postretirement benefit plans |  |  |  |  |  |  |  |  |  | 0 | 0
Income taxes |  |  |  |  |  |  |  |  |  | 0 | 0
Other, net |  |  |  |  |  |  |  |  |  | 19 | (87)
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  | $ 0 | $ 0

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