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v3.8.0.1

Consolidated Statements of Cash Flows - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 25, 2018 | Mar. 26, 2017
Operating activities |  |
Net earnings | $ 1,157 | $ 789
Adjustments to reconcile net earnings to net cash provided by operating activities |  |
Depreciation and amortization | 279 | 285
Stock-based compensation | 38 | 44
Changes in assets and liabilities |  |
Receivables, net | (108) | (799)
Contract assets | (1,413) | (62)
Inventories | (318) | (225)
Accounts payable | 1,290 | 1,111
Contract liabilities | (478) | (185)
Postretirement benefit plans | (1,145) | 345
Income taxes | 1,064 | 175
Other, net | 266 | 188
Net cash provided by operating activities | 632 | 1,666
Investing activities |  |
Capital expenditures | (216) | (170)
Other, net | 130 | 4
Net cash used for investing activities | (86) | (166)
Financing activities |  |
Repurchases of common stock | (300) | (500)
Dividends paid | (586) | (544)
Proceeds from stock option exercises | 33 | 31
Other, net | (161) | (108)
Net cash used for financing activities | (1,014) | (1,121)
Net change in cash and cash equivalents | (468) | 379
Cash and cash equivalents at beginning of period | 2,861 | 1,837
Cash and cash equivalents at end of period | $ 2,393 | $ 2,216

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