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Summary Of Significant Accounting Policies (Schedule Of Inventories) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
LIFO inventories |  |  |
FIFO value | $ 1,011 |  | $ 1,056
LIFO valuation reserve | (55) |  | (73)
LIFO inventories carrying value | 956 |  | 983
FIFO inventories | 2,908 |  | 2,906
Market inventories | 4,547 |  | 4,886
Supplies and other inventories | 402 |  | 398
Total inventories | $ 8,813 | $ 8,770 | $ 9,173

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