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Supplemental Financial Information (Detail) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Inventories
Finished goods	$ 6	$ 18
Service parts	10	11
Total inventories	16	29
Deferred revenue
Current deferred revenue	557	499
Long-term deferred revenue	43	38
Total deferred revenue	$ 600	$ 537

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