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Supplemental Financial Information (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Inventories
Finished goods	$ 17	$ 19
Service parts	11	12
Total inventories	28	31
Deferred revenue
Deferred revenue, current	555	472
Long-term deferred revenue	44	61
Total deferred revenue	$ 599	$ 533

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