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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Jan. 01, 2017 | Jan. 03, 2016 | Jul. 01, 2018 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Assets | $ 157,303 |  |  | $ 155,365 |
Sales return reserve (as a percent) | 1.00% | 1.00% | 1.00% |  |
Other assets decrease | $ (4,971) |  |  | (4,421) |
Retained earnings | $ 101,793 |  |  | $ 106,123 |
ASU 2016-16 - Income Taxes: Intra-Entity Transfers |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Deferred taxes |  |  |  |  | $ 2,000
Other assets decrease |  |  |  |  | 700
Retained earnings |  |  |  |  | 1,300
AOCI Attributable to Parent | ASU 2016-01 - Financial Instruments |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect adjustment |  |  |  |  | (232)
Retained Earnings | Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect adjustment |  |  |  |  | (47)
Retained Earnings | ASU 2016-01 - Financial Instruments |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect adjustment |  |  |  |  | 232
Retained Earnings | ASU 2016-16 - Income Taxes: Intra-Entity Transfers |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect adjustment |  |  |  |  | $ 1,311

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