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Financial Instruments - Additional Information (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 30, 2019 USD ($) Customer Vendor | Mar. 31, 2018 USD ($) | Mar. 30, 2019 USD ($) Customer Vendor | Mar. 31, 2018 USD ($) | Sep. 29, 2018 USD ($) Customer Vendor
Financial Instruments [Line Items] |  |  |  |  |
Non-marketable equity securities, carrying value | $ 2,300 |  | $ 2,300 |  |
Non-marketable debt security, amortized cost basis and carrying value | 1,500 |  | $ 1,500 |  |
Hedged interest rate transactions, expected recognition period |  |  | 9 years |  |
Fair value hedges, gains/(losses) excluded from effectiveness testing | 206 |  | $ 474 |  |
Potential reduction to derivative assets resulting from rights of set-off under master netting arrangements | 1,700 |  | 1,700 |  | $ 2,100
Potential reduction to derivative liabilities resulting from rights of set-off under master netting arrangements | 1,700 |  | 1,700 |  | 2,100
Net derivative assets/(liabilities) after potential reductions under master netting arrangements | $ (181) |  | $ (181) |  | $ 138
Trade receivables | Credit concentration risk |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Number of customers that individually represented 10% or more of total trade receivables | Customer | 0 |  | 0 |  | 1
Trade receivables | Credit concentration risk | Customer one |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  |  |  | 10.00%
Trade receivables | Credit concentration risk | Cellular network carriers |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 45.00% |  | 59.00%
Non-trade receivables | Credit concentration risk |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Number of vendors that individually represented 10% or more of total vendor non-trade receivables | Vendor | 2 |  | 2 |  | 2
Non-trade receivables | Credit concentration risk | Vendor one |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 56.00% |  | 62.00%
Non-trade receivables | Credit concentration risk | Vendor two |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 16.00% |  | 12.00%
Other current assets |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Net cash collateral posted, derivative instruments |  |  |  |  | $ 1,000
Other current liabilities |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Net cash collateral received, derivative instruments | $ 505 |  | $ 505 |  |
Net sales |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Non-designated derivatives, fair value adjustment gains/(losses) | (30) | $ (203) | 225 | $ (142) |
Cost of sales |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Non-designated derivatives, fair value adjustment gains/(losses) | (107) | (247) | 68 | (212) |
Other income/(expense), net |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Non-designated derivatives, fair value adjustment gains/(losses) | $ (77) | $ (331) | $ (24) | $ (373) |
Hedges of foreign currency exposure associated with revenue and inventory purchases |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Hedged foreign currency transactions, expected recognition period |  |  | 12 months |  |
Hedges of foreign currency exposure associated with term debt and marketable securities |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Hedged foreign currency transactions, expected recognition period |  |  | 23 years |  |
Minimum |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
General maturities of long-term marketable securities |  |  | 1 year |  |
Maximum |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
General maturities of long-term marketable securities |  |  | 5 years |  |

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