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STATEMENTS OF CONSOLIDATED CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash Flows From Operating Activities: |  |  |
Net Income | $ 4,910 | $ 3,431 | $ 4,844
Adjustments to reconcile net income to net cash from operating activities: |  |  |
Depreciation and amortization | 2,282 | 2,224 | 2,084
Pension and postretirement benefit expense | 1,643 | 3,725 | 1,189
Pension and postretirement benefit contributions | (7,794) | (2,668) | (1,229)
Self-insurance reserves | 0 | (21) | (80)
Deferred tax expense | 1,230 | 123 | 540
Stock compensation expense | 584 | 591 | 574
Other (gains) losses | 37 | (198) | (185)
Changes in assets and liabilities, net of effect of acquisitions: |  |  |
Accounts receivable | (1,022) | (704) | (452)
Other assets | (982) | (14) | 414
Accounts payable | 592 | 461 | (147)
Accrued wages and withholdings | 193 | 109 | (63)
Other liabilities | (241) | (561) | (6)
Other operating activities | 47 | (25) | (53)
Net cash from operating activities | 1,479 | 6,473 | 7,430
Cash Flows From Investing Activities: |  |  |
Capital expenditures | (5,227) | (2,965) | (2,379)
Proceeds from disposals of property, plant and equipment | 24 | 88 | 26
Purchases of marketable securities | (1,634) | (4,816) | (7,415)
Sales and maturities of marketable securities | 1,990 | 5,724 | 6,388
Net decrease in finance receivables | 5 | 9 | 5
Cash paid for business acquisitions | (134) | (547) | (1,904)
Other investing activities | 1 | (59) | (30)
Net cash used in investing activities | (4,975) | (2,566) | (5,309)
Cash Flows From Financing Activities: |  |  |
Net change in short-term debt | (250) | (88) | 2,529
Proceeds from long-term borrowings | 12,016 | 5,927 | 3,783
Repayments of long-term borrowings | (3,939) | (3,805) | (2,724)
Purchases of common stock | (1,813) | (2,678) | (2,702)
Issuances of common stock | 247 | 245 | 249
Dividends | (2,771) | (2,643) | (2,525)
Other financing activities | (203) | (98) | (175)
Net cash used in financing activities | 3,287 | (3,140) | (1,565)
Effect Of Exchange Rate Changes On Cash And Cash Equivalents | 53 | (21) | (117)
Net Increase (Decrease) In Cash And Cash Equivalents | (156) | 746 | 439
Cash And Cash Equivalents: |  |  |
Beginning of period | 3,476 | 2,730 | 2,291
End of period | 3,320 | 3,476 | 2,730
Cash Paid During The Period For: |  |  |
Interest (net of amount capitalized) | 428 | 373 | 345
Income taxes, net of refunds and overpayments | $ 1,559 | $ 2,064 | $ 1,913

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- Definition Amount of cost (reversal of cost) for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(4)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(b)(2)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3095-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + Details
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- Definition The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3098-108585 + Details
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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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