| **Fair Value Measurements and Financial Instruments (Tables)**           | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
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| **Fair Value Disclosures [Abstract]**                                    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Schedule of Financial Assets Measured at Fair Value on a Recurring Basis | A summary of assets and liabilities measured at fair value on a recurring basis at January 2, 2016 and January 3, 2015 is as follows (in millions): Balance SheetClassificationJanuary 2, 2016 Quoted PricesIn ActiveMarkets(Level 1) SignificantOtherObservableInputs(Level 2) SignificantUnobservableInputs(Level 3)Assets        Money-market securitiesCash and cash equivalents$273 $273 $— $—Available-for-sale securitiesOther current assets10 10 — —Foreign currency forward contractsOther current assets14 — 14 —Trading securitiesOther assets302 302 — —Foreign currency forward contractsOther assets2 — 2 —Total assets $601 $585 $16 $—         Liabilities        Contingent considerationOther current liabilities$118 $— $— $118Foreign currency forward contractsOther current liabilities6 — 6 —Contingent considerationOther liabilities33 — — 33Foreign currency forward contractsOther liabilities3 — 3 —Total liabilities $160 $— $9 $151 Balance SheetClassificationJanuary 3, 2015 Quoted PricesIn ActiveMarkets(Level 1) SignificantOtherObservableInputs(Level 2) SignificantUnobservableInputs(Level 3)Assets        Money-market securitiesCash and cash equivalents$729 $729 $— $—Available-for-sale securitiesOther current assets30 30 — —Trading securitiesOther assets301 301 — —Total assets $1,060 $1,060 $— $—         Liabilities        Contingent considerationOther liabilities$50 $— $— $50Total liabilities $50 $— $— $50 |
| Schedule of Significant Unobservable Inputs                              | The recurring Level 3 fair value measurements of the Company's contingent consideration liabilities include the following significant unobservable inputs (in millions):Contingent Consideration LiabilitiesFair Value as of January 2, 2016Valuation Technique Unobservable Input Value or Range         Spinal Modulation regulatory-based milestone$118Probability Weighted Discounted Cash Flow Discount Rate   2.1%    Probability of Payment   95%    Projected Year of Payment   2016         Spinal Modulation revenue-based milestones and earn-outs4Monte Carlo Simulation Discount Rates 1.3%-17.0%    Expected Revenue Volatility   25.0%    Projected Years of Payments 2017, 2018         Nanostim, Inc. (Nanostim) revenue-based milestones2Probability Weighted Discounted Cash Flow Discount Rate   5.0%    Probability of Payments   10.0%    Projected Years of Payments 2017, 2018         Assumed from Thoratec regulatory-based and revenue-based milestones27Probability Weighted Discounted Cash Flow Discount Rate   5.5%    Probability of Payments —%-90.0%    Projected Years of Payments 2017-2020Total contingent consideration liabilities$151                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Schedule of Contingent Consideration Liabilities                         | Additionally, the following table provides a reconciliation of the beginning and ending balances of the Company's contingent consideration liabilities (in millions): EndosenseNanostimSpinal ModulationAssumed from ThoratecTotalBalance as of December 29, 2012$—$—$—$—$—Initial fair value measurement of contingent consideration13256——188Change in fair value of contingent consideration1———1Foreign currency translation6———6Balance as of December 28, 201313956——195Change in fair value of contingent consideration28(6)——22Payment of contingent consideration(155)———(155)Foreign currency translation(12)———(12)Balance as of January 3, 2015—50——50Initial fair value measurement of contingent consideration——155—155Liabilities assumed from Thoratec acquisition———3333Change in fair value of contingent consideration—(48)(33)(6)(87)Balance as of January 2, 2016$—$2$122$27$151                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Schedule of Auction Rate Securities                                      | The following table provides a reconciliation of the beginning and ending balances of the Company's auction rate securities (in millions): Auction Rate SecuritiesBalance as of January 3, 2015$—Auction rate securities acquired from Thoratec5Sale of auction rate securities(5)Balance as of January 2, 2016$—                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |

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| - Definition
Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.
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| - Definition
Tabular disclosure of quantitative information about the inputs used in the fair value measurement of liabilities. This disclosure may include, but is not limited to, the fair value of the liability, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs.
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| - Definition
Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.
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| - Definition
Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).
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