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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2015
Supplemental Cash Flow Information [Abstract] |
Schedule of cash flows, supplemental disclosures | 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 |
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 |

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