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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 24, 2017
Sep. 25, 2016
Operating activities    
Net earnings $ 2,644 $ 4,314
Adjustments to reconcile net earnings to net cash provided by operating activities    
Depreciation and amortization 880 888
Stock-based compensation 133 124
Severance charges 0 99
Gain on divestiture of IS&GS business segment 0 (1,234)
Gain on step acquisition of AWE 0 (104)
Changes in assets and liabilities    
Receivables, net (819) (1,537)
Inventories, net (133) (235)
Accounts payable 1,229 1,033
Customer advances and amounts in excess of costs incurred (581) 57
Postretirement benefit plans 1,012 787
Income taxes (202) 37
Other, net 801 231
Net cash provided by operating activities 4,964 4,460
Investing activities    
Capital expenditures (670) (627)
Other, net 15 76
Net cash used for investing activities (655) (551)
Financing activities    
Special cash payment from divestiture of IS&GS business segment 0 1,800
Repurchases of common stock (1,500) (1,280)
Dividends paid (1,591) (1,518)
Repayments of long-term debt 0 (952)
Proceeds from stock option exercises 62 75
Other, net (176) (229)
Net cash used for financing activities (3,205) (2,104)
Net change in cash and cash equivalents 1,104 1,805
Cash and cash equivalents at beginning of period 1,837 1,090
Cash and cash equivalents at end of period $ 2,941 $ 2,895