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Supplemental Financial Information (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Inventories |  |
Finished goods | $ 10 | $ 18
Service parts | 10 | 11
Total inventories | 20 | 29
Deferred revenue |  |
Current deferred revenue | 544 | 499
Long-term deferred revenue | 41 | 38
Total deferred revenue | $ 585 | $ 537

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