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Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2014 | Jun. 30, 2013
Cash flows from operating activities: |  |
Net income | $ 1,429 | $ 1,117
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization expense | 835 | 835
Aruba Refinery asset retirement expense and other | 63 | 0
Deferred income tax expense | 73 | 341
Changes in current assets and current liabilities | (1,024) | 444
Changes in deferred charges and credits and other operating activities, net | 2 | 77
Net cash provided by operating activities | 1,378 | 2,814
Cash flows from investing activities: |  |
Capital expenditures | (954) | (1,211)
Deferred turnaround and catalyst costs | (369) | (449)
Other investing activities, net | (43) | (23)
Net cash used in investing activities | (1,366) | (1,683)
Cash flows from financing activities: |  |
Repayment of debt | (200) | (480)
Proceeds from the exercise of stock options | 32 | 43
Purchase of common stock for treasury | (455) | (560)
Common stock dividends | (266) | (220)
Contributions from noncontrolling interests | 14 | 45
Distributions to public unitholders of Valero Energy Partners LP | (4) | 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 | 52 | 24
Net cash used in financing activities | (827) | (413)
Effect of foreign exchange rate changes on cash | 3 | (43)
Net increase (decrease) in cash and temporary cash investments | (812) | 675
Cash and temporary cash investments at beginning of period | 4,292 | 1,723
Cash and temporary cash investments at end of period | $ 3,480 | $ 2,398

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