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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