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Supplemental Cash Flow Information (Tables) | 3 Months Ended
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Mar. 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 (loss) is adjusted by, among other things, changes in current assets and current liabilities as follows (in millions):
| Three Months Ended March 31,
| 2013 |  | 2012
Decrease (increase) in current assets: |  |  |
Receivables, net | $ | 409 |  |  | $ | 1,159 |
Inventories | (1,074 | ) |  | (471 | )
Income taxes receivable | 79 |  |  | (14 | )
Prepaid expenses and other | (233 | ) |  | 6 |
Increase (decrease) in current liabilities: |  |  |
Accounts payable | 561 |  |  | 410 |
Accrued expenses | 181 |  |  | (100 | )
Taxes other than income taxes | 318 |  |  | 9 |
Income taxes payable | 14 |  |  | (96 | )
Changes in current assets and current liabilities | $ | 255 |  |  | $ | 903 |
Cash flows related to interest and income taxes | Cash flows related to interest and income taxes were as follows (in millions):
| Three Months Ended March 31,
| 2013 |  | 2012
Interest paid in excess of amount capitalized | $ | 56 |  |  | $ | 45 |
Income taxes paid, net | 48 |  |  | 142 |

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