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Condensed Consolidated Financial Statement Details - Inventories (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Sep. 30, 2017
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Components | $ 4,287 | $ 3,025
Finished goods | 1,649 | 1,830
Total inventories | $ 5,936 | $ 4,855

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