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Financial Instruments (Tables) | 12 Months Ended
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Sep. 30, 2017
Investments, All Other Investments [Abstract] |
Cash and Available-for-Sale Securities by Significant Investment Category | The following tables show the Company’s cash and available-for-sale securities by significant investment category as of September 30, 2017 and September 24, 2016 (in millions):
| 2017
| Adjusted Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Short-Term Marketable Securities |  | Long-Term Marketable Securities
Cash | $ | 7,982 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,982 |  |  | $ | 7,982 |  |  | $ | — |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | 6,534 |  |  | — |  |  | — |  |  | 6,534 |  |  | 6,534 |  |  | — |  |  | — |
Mutual funds | 799 |  |  | — |  |  | (88 | ) |  | 711 |  |  | — |  |  | 711 |  |  | — |
Subtotal | 7,333 |  |  | — |  |  | (88 | ) |  | 7,245 |  |  | 6,534 |  |  | 711 |  |  | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities | 55,254 |  |  | 58 |  |  | (230 | ) |  | 55,082 |  |  | 865 |  |  | 17,228 |  |  | 36,989 |
U.S. agency securities | 5,162 |  |  | 2 |  |  | (9 | ) |  | 5,155 |  |  | 1,439 |  |  | 2,057 |  |  | 1,659 |
Non-U.S. government securities | 7,827 |  |  | 210 |  |  | (37 | ) |  | 8,000 |  |  | 9 |  |  | 123 |  |  | 7,868 |
Certificates of deposit and time deposits | 5,832 |  |  | — |  |  | — |  |  | 5,832 |  |  | 1,142 |  |  | 3,918 |  |  | 772 |
Commercial paper | 3,640 |  |  | — |  |  | — |  |  | 3,640 |  |  | 2,146 |  |  | 1,494 |  |  | — |
Corporate securities | 152,724 |  |  | 969 |  |  | (242 | ) |  | 153,451 |  |  | 172 |  |  | 27,591 |  |  | 125,688 |
Municipal securities | 961 |  |  | 4 |  |  | (1 | ) |  | 964 |  |  | — |  |  | 114 |  |  | 850 |
Mortgage- and asset-backed securities | 21,684 |  |  | 35 |  |  | (175 | ) |  | 21,544 |  |  | — |  |  | 656 |  |  | 20,888 |
Subtotal | 253,084 |  |  | 1,278 |  |  | (694 | ) |  | 253,668 |  |  | 5,773 |  |  | 53,181 |  |  | 194,714 |
Total | $ | 268,399 |  |  | $ | 1,278 |  |  | $ | (782 | ) |  | $ | 268,895 |  |  | $ | 20,289 |  |  | $ | 53,892 |  |  | $ | 194,714 |
| 2016
| Adjusted Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value |  | Cash and Cash Equivalents |  | Short-Term Marketable Securities |  | Long-Term Marketable Securities
Cash | $ | 8,601 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,601 |  |  | $ | 8,601 |  |  | $ | — |  |  | $ | — |
Level 1: |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | 3,666 |  |  | — |  |  | — |  |  | 3,666 |  |  | 3,666 |  |  | — |  |  | — |
Mutual funds | 1,407 |  |  | — |  |  | (146 | ) |  | 1,261 |  |  | — |  |  | 1,261 |  |  | — |
Subtotal | 5,073 |  |  | — |  |  | (146 | ) |  | 4,927 |  |  | 3,666 |  |  | 1,261 |  |  | — |
Level 2: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities | 41,697 |  |  | 319 |  |  | (4 | ) |  | 42,012 |  |  | 1,527 |  |  | 13,492 |  |  | 26,993 |
U.S. agency securities | 7,543 |  |  | 16 |  |  | — |  |  | 7,559 |  |  | 2,762 |  |  | 2,441 |  |  | 2,356 |
Non-U.S. government securities | 7,609 |  |  | 259 |  |  | (27 | ) |  | 7,841 |  |  | 110 |  |  | 818 |  |  | 6,913 |
Certificates of deposit and time deposits | 6,598 |  |  | — |  |  | — |  |  | 6,598 |  |  | 1,108 |  |  | 3,897 |  |  | 1,593 |
Commercial paper | 7,433 |  |  | — |  |  | — |  |  | 7,433 |  |  | 2,468 |  |  | 4,965 |  |  | — |
Corporate securities | 131,166 |  |  | 1,409 |  |  | (206 | ) |  | 132,369 |  |  | 242 |  |  | 19,599 |  |  | 112,528 |
Municipal securities | 956 |  |  | 5 |  |  | — |  |  | 961 |  |  | — |  |  | 167 |  |  | 794 |
Mortgage- and asset-backed securities | 19,134 |  |  | 178 |  |  | (28 | ) |  | 19,284 |  |  | — |  |  | 31 |  |  | 19,253 |
Subtotal | 222,136 |  |  | 2,186 |  |  | (265 | ) |  | 224,057 |  |  | 8,217 |  |  | 45,410 |  |  | 170,430 |
Total | $ | 235,810 |  |  | $ | 2,186 |  |  | $ | (411 | ) |  | $ | 237,585 |  |  | $ | 20,484 |  |  | $ | 46,671 |  |  | $ | 170,430 |
Derivative Instruments at Gross Fair Value | The following tables show the Company’s derivative instruments at gross fair value as of September 30, 2017 and September 24, 2016 (in millions):
| 2017
| Fair Value of Derivatives Designated as Hedge Instruments |  | Fair Value of Derivatives Not Designated as Hedge Instruments |  | Total Fair Value
Derivative assets (1): |  |  |  |  |
Foreign exchange contracts | $ | 1,049 |  |  | $ | 363 |  |  | $ | 1,412 |
Interest rate contracts | $ | 218 |  |  | $ | — |  |  | $ | 218 |
Derivative liabilities (2): |  |  |  |  |
Foreign exchange contracts | $ | 759 |  |  | $ | 501 |  |  | $ | 1,260 |
Interest rate contracts | $ | 303 |  |  | $ | — |  |  | $ | 303 |
| 2016
| Fair Value of Derivatives Designated as Hedge Instruments |  | Fair Value of Derivatives Not Designated as Hedge Instruments |  | Total Fair Value
Derivative assets (1): |  |  |  |  |
Foreign exchange contracts | $ | 518 |  |  | $ | 153 |  |  | $ | 671 |
Interest rate contracts | $ | 728 |  |  | $ | — |  |  | $ | 728 |
Derivative liabilities (2): |  |  |  |  |
Foreign exchange contracts | $ | 935 |  |  | $ | 134 |  |  | $ | 1,069 |
Interest rate contracts | $ | 7 |  |  | $ | — |  |  | $ | 7 |
(1) | The fair value of derivative assets is measured using Level 2 fair value inputs and is recorded as other current assets and other non-current assets in the Consolidated Balance Sheets.
(2) | The fair value of derivative liabilities is measured using Level 2 fair value inputs and is recorded as accrued expenses and other non-current liabilities in the Consolidated Balance Sheets.
Pre-Tax Gains and Losses of Derivative and Non-Derivative Instruments Designated as Cash Flow, Net Investment and Fair Value Hedges | The following table shows the pre-tax gains and losses of the Company’s derivative and non-derivative instruments designated as cash flow, net investment and fair value hedges in OCI and the Consolidated Statements of Operations for 2017, 2016 and 2015 (in millions):
| 2017 |  | 2016 |  | 2015
Gains/(Losses) recognized in OCI – effective portion: |  |  |  |  |
Cash flow hedges: |  |  |  |  |
Foreign exchange contracts | $ | 1,797 |  |  | $ | 109 |  |  | $ | 3,592 |
Interest rate contracts | 7 |  |  | (57 | ) |  | (111 | )
Total | $ | 1,804 |  |  | $ | 52 |  |  | $ | 3,481 |
Net investment hedges: |  |  |  |  |
Foreign exchange contracts | $ | — |  |  | $ | — |  |  | $ | 167 |
Foreign currency debt | 67 |  |  | (258 | ) |  | (71 | )
Total | $ | 67 |  |  | $ | (258 | ) |  | $ | 96 |
Gains/(Losses) reclassified from AOCI into net income – effective portion: |  |  |  |  |
Cash flow hedges: |  |  |  |  |
Foreign exchange contracts | $ | 1,958 |  |  | $ | 885 |  |  | $ | 4,092 |
Interest rate contracts | (2 | ) |  | (11 | ) |  | (17 | )
Total | $ | 1,956 |  |  | $ | 874 |  |  | $ | 4,075 |
Gains/(Losses) on derivative instruments: |  |  |  |  |
Fair value hedges: |  |  |  |  |
Interest rate contracts | $ | (810 | ) |  | $ | 341 |  |  | $ | 337 |
Gains/(Losses) related to hedged items: |  |  |  |  |
Fair value hedges: |  |  |  |  |
Fixed-rate debt | $ | 810 |  |  | $ | (341 | ) |  | $ | (337 | )
Notional Amounts of Outstanding Derivative Instruments and Credit Risk Amounts Associated with Outstanding or Unsettled Derivative Instruments | The following table shows the notional amounts of the Company’s outstanding derivative instruments and credit risk amounts associated with outstanding or unsettled derivative instruments as of September 30, 2017 and September 24, 2016 (in millions):
| 2017 |  | 2016
| Notional Amount |  | Credit Risk Amount |  | Notional Amount |  | Credit Risk Amount
Instruments designated as accounting hedges: |  |  |  |  |  |  |
Foreign exchange contracts | $ | 56,156 |  |  | $ | 1,049 |  |  | $ | 44,678 |  |  | $ | 518 |
Interest rate contracts | $ | 33,000 |  |  | $ | 218 |  |  | $ | 24,500 |  |  | $ | 728 |
Instruments not designated as accounting hedges: |  |  |  |  |  |  |
Foreign exchange contracts | $ | 69,774 |  |  | $ | 363 |  |  | $ | 54,305 |  |  | $ | 153 |

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