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v3.20.1

Comprehensive Income - Change in AOCI by Component (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 28, 2020 | Mar. 30, 2019 | Mar. 28, 2020 | Mar. 30, 2019 | Dec. 29, 2019 | Sep. 29, 2019 | Dec. 30, 2018 | Sep. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balances | $ 89,531 | $ 117,892 | $ 90,488 | $ 107,147 |  |  |  |
Total other comprehensive income/(loss) | (2,371) | 2,089 | (2,341) | 1,866 |  |  |  |
Ending balances | 78,425 | 105,860 | 78,425 | 105,860 |  |  |  |
Total AOCI |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balances | (418) | (3,588) | (584) | (3,454) |  |  |  |
Other comprehensive income/(loss) before reclassifications |  |  | (3,367) |  |  |  |  |
Amounts reclassified from AOCI |  |  | 353 |  |  |  |  |
Tax effect |  |  | 673 |  |  |  |  |
Total other comprehensive income/(loss) | (2,371) | 2,089 | (2,341) | 1,866 |  |  |  |
Cumulative effects of changes in accounting principles |  |  |  |  | $ 0 | $ 136 | $ 0 | $ 89
Ending balances | (2,789) | $ (1,499) | (2,789) | $ (1,499) |  |  |  |
Cumulative Foreign Currency Translation |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balances |  |  | (1,463) |  |  |  |  |
Other comprehensive income/(loss) before reclassifications |  |  | (356) |  |  |  |  |
Amounts reclassified from AOCI |  |  | 0 |  |  |  |  |
Tax effect |  |  | (8) |  |  |  |  |
Total other comprehensive income/(loss) |  |  | (364) |  |  |  |  |
Cumulative effects of changes in accounting principles |  |  |  |  |  | 0 |  |
Ending balances | (1,827) |  | (1,827) |  |  |  |  |
Unrealized Gains/Losses on Derivative Instruments |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balances |  |  | 172 |  |  |  |  |
Other comprehensive income/(loss) before reclassifications |  |  | (151) |  |  |  |  |
Amounts reclassified from AOCI |  |  | 329 |  |  |  |  |
Tax effect |  |  | 26 |  |  |  |  |
Total other comprehensive income/(loss) |  |  | 204 |  |  |  |  |
Cumulative effects of changes in accounting principles |  |  |  |  |  | 136 |  |
Ending balances | 512 |  | 512 |  |  |  |  |
Unrealized Gains/Losses on Marketable Debt Securities |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |
Beginning balances |  |  | 707 |  |  |  |  |
Other comprehensive income/(loss) before reclassifications |  |  | (2,860) |  |  |  |  |
Amounts reclassified from AOCI |  |  | 24 |  |  |  |  |
Tax effect |  |  | 655 |  |  |  |  |
Total other comprehensive income/(loss) |  |  | (2,181) |  |  |  |  |
Cumulative effects of changes in accounting principles |  |  |  |  |  | $ 0 |  |
Ending balances | $ (1,474) |  | $ (1,474) |  |  |  |  |

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