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Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Cash flows from operating activities: |  |
Net income | $ 2,491 | $ 1,441
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization expense | 1,265 | 1,283
Aruba Refinery asset retirement expense and other | 63 | 0
Deferred income tax expense | 191 | 488
Changes in current assets and current liabilities | (808) | (231)
Changes in deferred charges and credits and other operating activities, net | 42 | 54
Net cash provided by operating activities | 3,244 | 3,035
Cash flows from investing activities: |  |
Capital expenditures | (1,453) | (1,690)
Deferred turnaround and catalyst costs | (492) | (527)
Other investing activities, net | (41) | (56)
Net cash used in investing activities | (1,986) | (2,273)
Cash flows from financing activities: |  |
Repayment of debt | (200) | (480)
Proceeds from the exercise of stock options | 37 | 46
Purchase of common stock for treasury | (799) | (589)
Common stock dividends | (411) | (342)
Contributions from noncontrolling interests | 14 | 45
Distributions to public unitholders of Valero Energy Partners LP | (8) | 0
Disposition of retail business: |  |
Proceeds from short-term debt in anticipation of separation | 0 | 550
Cash distributed to Valero by CST Brands, Inc. | 0 | 500
Cash held and retained by CST Brands, Inc. upon separation | 0 | (315)
Other financing activities, net | 51 | 27
Net cash used in financing activities | (1,316) | (558)
Effect of foreign exchange rate changes on cash | (43) | (19)
Net increase (decrease) in cash and temporary cash investments | (101) | 185
Cash and temporary cash investments at beginning of period | 4,292 | 1,723
Cash and temporary cash investments at end of period | $ 4,191 | $ 1,908

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