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Consolidated Statements of Cash Flows (Unaudited) (USD $) In Millions, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Cash flows from operating activities: |  |
Net income | $ 1,441 | $ 1,071
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization expense | 1,283 | 1,172
Asset impairment losses | 0 | 956
Noncash interest expense and other income, net | (7) | 18
Stock-based compensation expense | 31 | 29
Deferred income tax expense | 488 | 576
Changes in current assets and current liabilities | (231) | 1,191
Changes in deferred charges and credits and other operating activities, net | 30 | (66)
Net cash provided by operating activities | 3,035 | 4,947
Cash flows from investing activities: |  |
Capital expenditures | (1,690) | (2,129)
Deferred turnaround and catalyst costs | (527) | (339)
Proceeds from the sale of the Paulsboro Refinery | 0 | 160
Minor acquisitions | 0 | (77)
Other investing activities, net | (56) | (28)
Net cash used in investing activities | (2,273) | (2,413)
Non-bank debt: |  |
Borrowings | 0 | 300
Repayments | (480) | (862)
Bank credit agreements: |  |
Borrowings | 0 | 1,100
Repayments | 0 | (1,100)
Accounts receivable sales program: |  |
Proceeds from the sale of receivables | 0 | 1,500
Repayments | 0 | (1,650)
Purchase of common stock for treasury | (589) | (148)
Proceeds from the exercise of stock options | 46 | 36
Common stock dividends | (342) | (263)
Contributions from noncontrolling interests | 45 | 34
Separation of retail business: |  |
Proceeds from short-term debt | 550 | 0
Cash distributed to Valero by CST Brands, Inc. | 500 | 0
Cash held and retained by CST Brands, Inc. upon separation | (315) | 0
Other financing activities, net | 27 | 8
Net cash used in financing activities | (558) | (1,045)
Effect of foreign exchange rate changes on cash | (19) | 36
Net increase in cash and temporary cash investments | 185 | 1,525
Cash and temporary cash investments at beginning of period | 1,723 | 1,024
Cash and temporary cash investments at end of period | $ 1,908 | $ 2,549

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