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Condensed Consolidated Financial Statement Details - Inventories (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Sep. 30, 2017
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Components | $ 5,186 | $ 3,025
Finished goods | 2,476 | 1,830
Total inventories | $ 7,662 | $ 4,855

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