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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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