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Supplemental Financial Information (Detail) - USD ($) $ in Millions | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Inventories |  |  |
Finished goods | $ 40 |  | $ 16
Service parts | 12 |  | 12
Total inventories | 52 |  | 28
Deferred revenue |  |  |
Deferred revenue, current | 569 | $ 490 | 490
Long-term deferred revenue | 100 | $ 105 | 105
Total deferred revenue | $ 669 |  | $ 595

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