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Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Schedule of inventory by costing method [Table Text Block] | The following table sets forth the Company’s inventories as of December 31, 2017 and 2016.
| December 31, 2017 |  | December 31, 2016
| (In millions)
LIFO inventories |  |  |
FIFO value | $ | 1,056 |  |  | $ | 1,390 |
LIFO valuation reserve | (73 | ) |  | (75 | )
LIFO inventories carrying value | 983 |  |  | 1,315 |
FIFO inventories | 2,906 |  |  | 2,705 |
Market inventories | 4,886 |  |  | 4,424 |
Supplies and other inventories | 398 |  |  | 387 |
Total inventories | $ | 9,173 |  |  | $ | 8,831 |

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