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Supplemental Financial Information (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Inventories      
Finished goods $ 17   $ 18
Service parts 11   12
Total inventories 28   30
Deferred revenue      
Deferred revenue, current 461 $ 395 414
Long-term deferred revenue 109 $ 85 85
Total deferred revenue $ 570   $ 499