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| | Quarter Ended December 31, | | | Year Ended December 31, | |
| | 2018 | | | 2017 | | | 2018 | | | 2017 | |
Cash flows from operating activities: | | | | | | | | | | | | | | | | |
Net earnings | | $ | 1,149 | | | $ | 304 | | | $ | 3,224 | | | $ | 1,078 | |
Adjustments to reconcile net earnings to net cash from operating activities: | | | | | | | | | | | | | | | | |
Net earnings from discontinued operations, net of income tax expense | | | — | | | | (260 | ) | | | (2,460 | ) | | | (320 | ) |
Depreciation, depletion and amortization | | | 423 | | | | 390 | | | | 1,658 | | | | 1,529 | |
Asset impairments | | | — | | | | — | | | | 156 | | | | — | |
Leasehold impairments | | | 19 | | | | 139 | | | | 95 | | | | 219 | |
Accretion on discounted liabilities | | | 15 | | | | 16 | | | | 61 | | | | 63 | |
Total (gains) losses on commodity derivatives | | | (1,422 | ) | | | 57 | | | | (608 | ) | | | (157 | ) |
Cash settlements on commodity derivatives | | | 127 | | | | 10 | | | | (84 | ) | | | 53 | |
Gains on asset dispositions | | | (268 | ) | | | (17 | ) | | | (263 | ) | | | (217 | ) |
Deferred income tax expense (benefit) | | | 358 | | | | (40 | ) | | | 226 | | | | (97 | ) |
Share-based compensation | | | 34 | | | | 36 | | | | 161 | | | | 150 | |
Early retirement of debt | | | — | | | | — | | | | 312 | | | | — | |
Total (gains) losses on foreign exchange | | | 86 | | | | 6 | | | | 139 | | | | (132 | ) |
Settlements of intercompany foreign denominated assets/liabilities | | | 2 | | | | (1 | ) | | | (241 | ) | | | 9 | |
Other | | | 3 | | | | 2 | | | | (5 | ) | | | (1 | ) |
Changes in assets and liabilities, net | | | 16 | | | | (89 | ) | | | (143 | ) | | | 32 | |
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Net cash from operating activities - continuing operations | | | 542 | | | | 553 | | | | 2,228 | | | | 2,209 | |
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Cash flows from investing activities: | | | | | | | | | | | | | | | | |
Capital expenditures | | | (600 | ) | | | (670 | ) | | | (2,451 | ) | | | (1,968 | ) |
Acquisitions of property and equipment | | | (20 | ) | | | (7 | ) | | | (55 | ) | | | (46 | ) |
Divestitures of property and equipment | | | 317 | | | | 39 | | | | 1,013 | | | | 426 | |
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Net cash from investing activities - continuing operations | | | (303 | ) | | | (638 | ) | | | (1,493 | ) | | | (1,588 | ) |
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Cash flows from financing activities: | | | | | | | | | | | | | | | | |
Repayments of long-term debt principal | | | (95 | ) | | | — | | | | (922 | ) | | | — | |
Early retirement of debt | | | — | | | | — | | | | (304 | ) | | | — | |
Repurchases of common stock | | | (759 | ) | | | — | | | | (2,956 | ) | | | — | |
Dividends paid on common stock | | | (37 | ) | | | (32 | ) | | | (149 | ) | | | (127 | ) |
Shares exchanged for tax withholdings | | | (1 | ) | | | (2 | ) | | | (48 | ) | | | (59 | ) |
Other | | | (6 | ) | | | — | | | | (7 | ) | | | — | |
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Net cash from financing activities - continuing operations | | | (898 | ) | | | (34 | ) | | | (4,386 | ) | | | (186 | ) |
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Effect of exchange rate changes on cash: | | | | | | | | | | | | | | | | |
Settlements of intercompany foreign denominated assets/liabilities | | | (2 | ) | | | 1 | | | | 241 | | | | (9 | ) |
Other | | | (14 | ) | | | (7 | ) | | | (35 | ) | | | 15 | |
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Total effect of exchange rate changes on cash - continuing operations | | | (16 | ) | | | (6 | ) | | | 206 | | | | 6 | |
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Net change in cash, cash equivalents and restricted cash of continuing operations | | | (675 | ) | | | (125 | ) | | | (3,445 | ) | | | 441 | |
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Cash flows from discontinued operations: | | | | | | | | | | | | | | | | |
Operating activities | | | — | | | | 172 | | | | 476 | | | | 700 | |
Investing activities | | | — | | | | (136 | ) | | | 2,548 | | | | (611 | ) |
Financing activities | | | — | | | | (81 | ) | | | 183 | | | | 195 | |
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Net change in cash, cash equivalents and restricted cash of discontinued operations | | | — | | | | (45 | ) | | | 3,207 | | | | 284 | |
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Net change in cash, cash equivalents and restricted cash | | | (675 | ) | | | (170 | ) | | | (238 | ) | | | 725 | |
Cash, cash equivalents and restricted cash at beginning of period | | | 3,121 | | | | 2,854 | | | | 2,684 | | | | 1,959 | |
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Cash, cash equivalents and restricted cash at end of period | | $ | 2,446 | | | $ | 2,684 | | | $ | 2,446 | | | $ | 2,684 | |
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Reconciliation of cash, cash equivalents and restricted cash: | | | | | | | | | | | | | | | | |
Cash and cash equivalents | | $ | 2,414 | | | $ | 2,642 | | | $ | 2,414 | | | $ | 2,642 | |
Restricted cash included in other current assets | | | 32 | | | | 11 | | | | 32 | | | | 11 | |
Cash and cash equivalents included in current assets held for sale | | | — | | | | 31 | | | | — | | | | 31 | |
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Total cash, cash equivalents and restricted cash | | $ | 2,446 | | | $ | 2,684 | | | $ | 2,446 | | | $ | 2,684 | |
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