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Supplemental Financial Information (Detail) - USD ($) $ in Millions | Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Inventories |  |  |
Finished goods | $ 33 |  | $ 18
Service parts | 12 |  | 12
Total inventories | 45 |  | 30
Deferred revenue |  |  |
Deferred revenue, current | 384 | $ 395 | 414
Long-term deferred revenue | 102 | $ 85 | 85
Total deferred revenue | $ 486 |  | $ 499

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