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Inventories, Net - Summary of Inventories (Detail) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Inventory Disclosure [Abstract] |  |  |  |  |  |
Finished goods and other |  |  |  | $ 630 | $ 531 | $ 737
Less: inventory reserves | $ (40) | $ (48) | $ (44) | (40) | (48) | (44)
Total |  |  |  | $ 590 | $ 483 | $ 693
Inventory reserves: |  |  |  |  |  |
Inventory reserves, Beginning balance | 48 | 44 | 39 |  |  |
Additions charged to expenses | 11 | 36 | 54 |  |  |
Inventory reserves, Charge-offs and other | (19) | (32) | (49) |  |  |
Inventory reserves, Ending balance | $ 40 | $ 48 | $ 44 |  |  |

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