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Supplemental Financial Information (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Inventories
Finished goods	$ 3	$ 19
Service parts	11	12
Total inventories	14	31
Deferred revenue
Current deferred revenue	482	472
Long-term deferred revenue	38	61
Total deferred revenue	$ 520	$ 533

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