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Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Cash flows from operating activities: |  |  |
Net income | $ 2,728 | $ 2,080 | $ 2,089
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization expense | 1,720 | 1,574 | 1,534
Gain on disposition of retained interest in CST Brands, Inc. | (325) | 0 | 0
Asset impairment losses | 0 | 1,014 | 0
Loss on sales of refinery assets, net | 0 | 0 | 12
Stock-based compensation expense | 64 | 58 | 58
Deferred income tax expense | 501 | 963 | 461
Changes in current assets and current liabilities | 922 | (302) | 81
Changes in deferred charges and credits and other operating activities, net | (46) | (117) | (197)
Net cash provided by operating activities | 5,564 | 5,270 | 4,038
Cash flows from investing activities: |  |  |
Capital expenditures | (2,121) | (2,931) | (2,355)
Deferred turnaround and catalyst costs | (634) | (479) | (629)
Acquisition of Pembroke Refinery, net of cash acquired | 0 | 0 | (1,691)
Acquisition of Meraux Refinery | 0 | 0 | (547)
Proceeds from the sale of the Paulsboro Refinery | 0 | 160 | 0
Other investing activities, net | (57) | (101) | (76)
Net cash used in investing activities | (2,812) | (3,351) | (5,298)
Cash flows from financing activities: |  |  |
Proceeds from debt borrowings | 0 | 2,900 | 150
Repayments of debt | (480) | (3,612) | (778)
Proceeds from the exercise of stock options | 59 | 59 | 49
Purchase of common stock for treasury | (928) | (281) | (349)
Common stock dividends | (462) | (360) | (169)
Net proceeds from initial public offering of common units of Valero Energy Partners LP | 369 | 0 | 0
Contributions from noncontrolling interests | 45 | 44 | 22
Disposition of retail business: |  |  |
Proceeds from short-term debt in anticipation of separation | 550 | 0 | 0
Cash distributed to Valero by CST Brands, Inc. | 500 | 0 | 0
Cash held and retained by CST Brands, Inc. upon separation | (315) | 0 | 0
Proceeds from short-term debt related to disposition of retained interest | 525 | 0 | 0
Repayments of short-term debt related to disposition of retained interest | (58) | 0 | 0
Other financing activities, net | 32 | 17 | 9
Net cash used in financing activities | (163) | (1,233) | (1,066)
Effect of foreign exchange rate changes on cash | (20) | 13 | 16
Net increase (decrease) in cash and temporary cash investments | 2,569 | 699 | (2,310)
Cash and temporary cash investments at beginning of year | 1,723 | 1,024 | 3,334
Cash and temporary cash investments at end of year | $ 4,292 | $ 1,723 | $ 1,024

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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: 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=31042434&loc=d3e3095-108585 Reference 3: 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=31042434&loc=d3e3098-108585 + Details
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- Definition Amount of cash inflow (outflow) from (to) a noncontrolling interest. Excludes dividends paid to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591551-111686 + 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=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The cash outflow attributable to repayments of borrowings not otherwise defined in the taxonomy (having initial terms 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 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + 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=31042434&loc=d3e3602-108585 + Details
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