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Taxes on Earnings - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns |  |  |
Balance at beginning of year | $ 10,808 | $ 10,858 | $ 6,546
Increases: |  |  |
For current year’s tax positions | 66 | 52 | 468
For prior years’ tax positions | 101 | 85 | 4,004
Decreases: |  |  |
For prior years’ tax positions | (248) | (181) | (62)
Statute of limitations expirations | (3) | (1) | 0
Settlements with taxing authorities | (2,953) | (5) | (98)
Balance at end of year | $ 7,771 | $ 10,808 | $ 10,858

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