Composition of Certain Financial Statement Items Investment and Other Income, Net (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2019 |
Mar. 25, 2018 |
Mar. 31, 2019 |
Mar. 25, 2018 |
|
| Investment Income, Net [Abstract] | ||||
| Interest and dividend income | $ 80 | $ 154 | $ 155 | $ 280 |
| Net gains (losses) on marketable securities | 40 | 3 | (33) | 13 |
| Net gains on other investments | 6 | 47 | 42 | 60 |
| Impairment losses on marketable securities and other investments | (60) | (11) | (69) | (20) |
| Net (losses) gains on derivative investments | (1) | 10 | (9) | 9 |
| Equity in net losses of investees | (36) | (17) | (58) | (38) |
| Net (losses) gains on foreign currency transactions | (1) | (90) | 5 | (93) |
| Investment and other income, net | $ 28 | $ 96 | $ 33 | $ 211 |
| X | ||||||||||
- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of gain (loss) included in earnings for investments classified as other. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The aggregate amount of income from investments (for example, dividends) not considered a component of the entity's core operations. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of realized gain (loss) on investment in marketable security, excluding other-than-temporary impairment (OTTI). No definition available.
|