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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 01, 2018 | Apr. 02, 2017 | Jan. 01, 2017 | Apr. 01, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Equity Securities | $ 731 |  |  | $ 731 |  | $ 751
Foreign currency translation | 623 | $ 395 |  |  |  |
Accumulated other comprehensive income on derivatives, after tax | $ 84 |  |  | $ 84 |  |
Reclassification of foreign exchange contracts into earnings, period | next 12 months |  |  |  |  |
Maximum length of time for hedge exposure | 18 months |  |  |  |  |
Other income/(expense), net, related to foreign exchange contracts, non hedging | $ (19) | (29) |  |  |  |
Unrealized gains on equity investments | $ 0 | 89 |  |  |  |
Weighted average interest rate on non-current debt | 3.19% |  |  | 3.19% |  |
Excess of the estimated fair value over the carrying value of debt |  |  | $ 2,000 |  |  |
Foreign exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Collateral Already Posted, Aggregate Fair Value | $ 32 |  |  | $ 32 |  |
Derivative notional amounts outstanding | 35,300 |  |  | 35,300 |  | 34,500
Cross currency interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative notional amounts outstanding | 2,300 |  |  | 2,300 |  | 2,300
Interest Rate Contract |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative Liability, Noncurrent | 14 |  |  | 14 |  | 9
Derivative notional amounts outstanding | 1,100 |  |  | 1,100 |  | 1,100
Equity Securities |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Equity Securities | 731 |  |  | 731 |  | $ 751
Other Comprehensive Income (Loss) |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Foreign currency translation | (150) |  |  | $ (372) |  |
Equity Investments without readily determinable value | Equity Securities |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Impairment on equity method investments | $ (20) |  |  |  |  |
Equity Investments with readily determinable value | Equity Securities |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Unrealized gains on equity investments |  | $ 349 |  |  |  |
Retained Earnings | ASU 2016-01 - Financial Instruments |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Cumulative effect adjustment |  |  |  |  | $ 232 |

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