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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2013
Supplemental Cash Flow Information [Abstract] |
Changes in current assets and current liabilities | 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,
| 2013 |  | 2012 |  | 2011
Decrease (increase) in current assets: |  |  |  |  |
Receivables, net | $ | (753 | ) |  | $ | 437 |  |  | $ | (3,110 | )
Inventories | (13 | ) |  | (282 | ) |  | 643 |
Income taxes receivable | 10 |  |  | 51 |  |  | 128 |
Prepaid expenses and other | 2 |  |  | (28 | ) |  | (2 | )
Increase (decrease) in current liabilities: |  |  |  |  |
Accounts payable | 977 |  |  | (113 | ) |  | 2,004 |
Accrued expenses | 53 |  |  | 13 |  |  | (18 | )
Taxes other than income taxes | 337 |  |  | (260 | ) |  | 312 |
Income taxes payable | 309 |  |  | (120 | ) |  | 124 |
Changes in current assets and current liabilities | $ | 922 |  |  | $ | (302 | ) |  | $ | 81 |
Cash flows related to interest and income taxes paid | Cash flows related to interest and income taxes paid were as follows (in millions):
| Year Ended December 31,
| 2013 |  | 2012 |  | 2011
Interest paid in excess of amount capitalized | $ | 361 |  |  | $ | 302 |  |  | $ | 397 |
Income taxes paid, net | 387 |  |  | 705 |  |  | 486 |

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