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Supplemental Cash Flow Information | 12 Months Ended
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Dec. 31, 2015
Supplemental Cash Flow Information [Abstract] |
SUPPLEMENTAL CASH FLOW INFORMATION |
18. | SUPPLEMENTAL CASH FLOW INFORMATION
In order to determine net cash provided by operating activities, net income is adjusted by, among other things, changes in current assets and current liabilities as follows (in millions):
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Decrease (increase) in current assets: |  |  |  |  |
Receivables, net | $ | 1,294 |  |  | $ | 2,753 |  |  | $ | (753 | )
Inventories | (222 | ) |  | (1,014 | ) |  | (13 | )
Income taxes receivable | (104 | ) |  | (23 | ) |  | 10 |
Prepaid expenses and other | (45 | ) |  | (32 | ) |  | 2 |
Increase (decrease) in current liabilities: |  |  |  |  |
Accounts payable | (1,787 | ) |  | (3,149 | ) |  | 977 |
Accrued expenses | (40 | ) |  | 38 |  |  | 53 |
Taxes other than income taxes | (74 | ) |  | (64 | ) |  | 337 |
Income taxes payable | (328 | ) |  | (319 | ) |  | 309 |
Changes in current assets and current liabilities | $ | (1,306 | ) |  | $ | (1,810 | ) |  | $ | 922 |
The above changes in current assets and current liabilities differ from changes between amounts reflected in the applicable balance sheets for the respective periods for the following reasons:
• | the amounts shown above exclude changes in cash and temporary cash investments, deferred income taxes, and current portion of debt and capital lease obligations, as well as the effect of certain noncash investing and financing activities discussed below;
• | the amounts shown above for the year ended December 31, 2013 exclude the change in current assets and current liabilities resulting from the separation of our retail business as described in Note 3;
• | amounts accrued for capital expenditures and deferred turnaround and catalyst costs are reflected in investing activities when such amounts are paid;
• | amounts accrued for common stock purchases in the open market that are not settled as of the balance sheet date are reflected in financing activities when the purchases are settled and paid; and
• | certain differences between balance sheet changes and the changes reflected above result from translating foreign currency denominated balances at the applicable exchange rates as of each balance sheet date.
Noncash investing and financing activities for the year ended December 31, 2015 included the recognition of a capital lease asset and related obligation associated with an agreement for storage tanks near one of our refineries. Noncash financing activities for the year ended December 31, 2015 also included an accrual of $25 million for the purchase of 347,438 shares of our common stock, which was settled in early January 2016. There were no significant noncash investing activities for the years ended December 31, 2014 and 2013. There were no significant noncash financing activities for the year ended December 31, 2014. Noncash financing activities for the year ended December 31, 2013 included the exchange of CST’s senior unsecured bonds and the exchange of all of our remaining shares of CST common stock with third-party financial institutions in satisfaction of our short-term debt agreements as described in Note 10. Cash flows related to interest and income taxes paid were as follows (in millions):
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Interest paid in excess of amount capitalized | $ | 416 |  |  | $ | 392 |  |  | $ | 361 |
Income taxes paid, net | 2,093 |  |  | 1,624 |  |  | 387 |
Cash flows related to the discontinued operations of the Aruba Refinery were immaterial for the years ended December 31, 2014 and 2013.

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- Definition The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 + Details
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