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Supplemental Cash Flow Information (Tables) | 6 Months Ended
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Jun. 30, 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):
| Six Months Ended June 30,
| 2013 |  | 2012
Decrease (increase) in current assets: |  |  |
Receivables, net | $ | 412 |  |  | $ | 1,927 |
Inventories | (824 | ) |  | 198 |
Income taxes receivable | 31 |  |  | (79 | )
Prepaid expenses and other | 2 |  |  | (15 | )
Increase (decrease) in current liabilities: |  |  |
Accounts payable | 625 |  |  | (1,413 | )
Accrued expenses | (44 | ) |  | (60 | )
Taxes other than income taxes | 268 |  |  | 67 |
Income taxes payable | (26 | ) |  | (60 | )
Changes in current assets and current liabilities | $ | 444 |  |  | $ | 565 |
Cash flows related to interest and income taxes | Cash flows related to interest and income taxes were as follows (in millions):
| Six Months Ended June 30,
| 2013 |  | 2012
Interest paid in excess of amount capitalized | $ | 160 |  |  | $ | 164 |
Income taxes paid, net | 243 |  |  | 204 |

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