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Supplemental Financial Information (Detail) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Inventories      
Finished goods $ 24   $ 16
Service parts 12   12
Total inventories 36   28
Deferred revenue      
Deferred revenue, current 408 $ 490 490
Long-term deferred revenue 68 $ 105 105
Total deferred revenue $ 476   $ 595