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Comprehensive Income (Tables) | 12 Months Ended
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Sep. 30, 2017
Equity [Abstract] |
Pre-tax Amounts Reclassified from AOCI into Consolidated Statements of Operations | The following table shows the pre-tax amounts reclassified from AOCI into the Consolidated Statements of Operations, and the associated financial statement line item, for 2017 and 2016 (in millions):
Comprehensive Income Components |  | Financial Statement Line Item |  | 2017 |  | 2016
Unrealized (gains)/losses on derivative instruments: |  |  |  |  |  |
Foreign exchange contracts |  | Revenue |  | $ | (662 | ) |  | $ | (865 | )
|  | Cost of sales |  | (654 | ) |  | (130 | )
|  | Other income/(expense), net |  | (638 | ) |  | 111 |
Interest rate contracts |  | Other income/(expense), net |  | 2 |  |  | 12 |
|  |  |  | (1,952 | ) |  | (872 | )
Unrealized (gains)/losses on marketable securities |  | Other income/(expense), net |  | (99 | ) |  | 87 |
Total amounts reclassified from AOCI |  |  |  | $ | (2,051 | ) |  | $ | (785 | )
Changes in AOCI by Component | The following table shows the changes in AOCI by component for 2017 and 2016 (in millions):
| Cumulative Foreign Currency Translation |  | Unrealized Gains/Losses on Derivative Instruments |  | Unrealized Gains/Losses on Marketable Securities |  | Total
Balances as of September 26, 2015 | $ | (653 | ) |  | $ | 772 |  |  | $ | (464 | ) |  | $ | (345 | )
Other comprehensive income/(loss) before reclassifications | 67 |  |  | 14 |  |  | 2,445 |  |  | 2,526 |
Amounts reclassified from AOCI | — |  |  | (872 | ) |  | 87 |  |  | (785 | )
Tax effect | 8 |  |  | 124 |  |  | (894 | ) |  | (762 | )
Other comprehensive income/(loss) | 75 |  |  | (734 | ) |  | 1,638 |  |  | 979 |
Balances as of September 24, 2016 | (578 | ) |  | 38 |  |  | 1,174 |  |  | 634 |
Other comprehensive income/(loss) before reclassifications | 301 |  |  | 1,793 |  |  | (1,207 | ) |  | 887 |
Amounts reclassified from AOCI | — |  |  | (1,952 | ) |  | (99 | ) |  | (2,051 | )
Tax effect | (77 | ) |  | (3 | ) |  | 460 |  |  | 380 |
Other comprehensive income/(loss) | 224 |  |  | (162 | ) |  | (846 | ) |  | (784 | )
Balances as of September 30, 2017 | $ | (354 | ) |  | $ | (124 | ) |  | $ | 328 |  |  | $ | (150 | )

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- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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