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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Supplemental Cash Flow Information [Abstract] |
Schedule of cash flows, supplemental disclosures | 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,
| 2017 |  | 2016 |  | 2015
Decrease (increase) in current assets: |  |  |  |  |
Receivables, net | $ | (870 | ) |  | $ | (1,531 | ) |  | $ | 1,294 |
Inventories | (516 | ) |  | 771 |  |  | (222 | )
Prepaid expenses and other | 151 |  |  | 47 |  |  | (149 | )
Increase (decrease) in current liabilities: |  |  |  |  |
Accounts payable | 1,842 |  |  | 1,556 |  |  | (1,787 | )
Accrued expenses | 21 |  |  | 117 |  |  | (40 | )
Taxes other than income taxes payable | 172 |  |  | 82 |  |  | (74 | )
Income taxes payable | 489 |  |  | (66 | ) |  | (328 | )
Changes in current assets and current liabilities | $ | 1,289 |  |  | $ | 976 |  |  | $ | (1,306 | )
Cash flows related to interest and income taxes were as follows (in millions):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Interest paid in excess of amount capitalized | $ | 457 |  |  | $ | 427 |  |  | $ | 416 |
Income taxes paid, net | 410 |  |  | 444 |  |  | 2,093 |

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